1 00:00:00,840 --> 00:00:07,230 Okay now let's actually open this Android device monitor here as you can see we have this little Android 2 00:00:07,260 --> 00:00:08,050 image here. 3 00:00:08,070 --> 00:00:13,650 Click on it and it's going to open the Android device monitor for us. 4 00:00:13,890 --> 00:00:19,890 So as you can see here inside this Android device monitor application we have some taps here. 5 00:00:19,890 --> 00:00:23,850 So just a selectees file explorer tab as you can see here. 6 00:00:23,940 --> 00:00:26,840 Now let me actually make this area wider. 7 00:00:27,120 --> 00:00:29,670 And now as you can see if you have some files here. 8 00:00:29,720 --> 00:00:30,300 OK. 9 00:00:30,510 --> 00:00:33,810 We want to actually access these toilets about application. 10 00:00:33,810 --> 00:00:37,040 So as you can see here let me try to open it again. 11 00:00:37,840 --> 00:00:43,070 Now as you can see money still quit unexpectedly so this is a bug in our Android device Monita. 12 00:00:43,070 --> 00:00:49,450 So here I just need to reopen this application again here and now as you can see here we have these 13 00:00:49,540 --> 00:00:52,110 storage folder here as you can see here. 14 00:00:52,110 --> 00:00:54,360 I just need to open these stores folder. 15 00:00:54,460 --> 00:00:57,600 We have an emulator folder here as you can see. 16 00:00:57,670 --> 00:01:02,440 Open it and here we have a folder and the name of this folder is zero. 17 00:01:02,680 --> 00:01:06,440 And as you can see here we have these directories inside this folder. 18 00:01:06,460 --> 00:01:12,670 So if you don't have these directories in your Android device monitor as I have here as you can see 19 00:01:12,670 --> 00:01:20,380 alarm's directory and Android directory directory documents directory download directory movies directory 20 00:01:20,500 --> 00:01:28,130 you can actually create another directory of the custom name as the name of these directories that I 21 00:01:28,300 --> 00:01:28,840 have here. 22 00:01:28,840 --> 00:01:29,300 OK. 23 00:01:29,440 --> 00:01:34,500 So here in order to create another directory here you just need to select this a zero folder here. 24 00:01:34,570 --> 00:01:40,420 As you can see and then click on this plus button here and now you can actually create an order for 25 00:01:40,450 --> 00:01:40,750 there. 26 00:01:40,750 --> 00:01:41,270 Here. 27 00:01:41,440 --> 00:01:41,910 OK. 28 00:01:42,040 --> 00:01:48,970 So be sure to actually create a folder with the name as the name of these directories that I have here. 29 00:01:48,970 --> 00:01:55,500 For example movies directory with a capital M music directory with a capital M notification it's directory 30 00:01:55,750 --> 00:02:01,570 pictures directory Portchester directory and the victims directory or alarm's directory and then you 31 00:02:01,570 --> 00:02:02,550 can actually click on. 32 00:02:02,560 --> 00:02:02,940 OK. 33 00:02:03,010 --> 00:02:03,460 OK. 34 00:02:03,550 --> 00:02:09,260 So if you don't have these directories that I have here you can create these directories here. 35 00:02:09,460 --> 00:02:15,040 And as you can see here for example inside this download electively I created an order directed here 36 00:02:15,580 --> 00:02:20,590 by using the application and the name of this directory is these are download for example or some other 37 00:02:20,590 --> 00:02:22,540 name or inside these movies directly. 38 00:02:22,540 --> 00:02:25,440 I have another directory migrate to movies. 39 00:02:25,450 --> 00:02:26,830 OK I have another folder. 40 00:02:26,990 --> 00:02:31,910 So and then I can actually put some other files here and as you can see here at the top here. 41 00:02:31,970 --> 00:02:33,120 We have another option. 42 00:02:33,130 --> 00:02:38,020 For example this option here says pull a file from the device. 43 00:02:38,020 --> 00:02:44,080 So here we can actually pull another file from this device and put it on the desktop. 44 00:02:44,080 --> 00:02:51,280 So if I click on this button here now I can actually for example choose other options. 45 00:02:51,430 --> 00:02:51,920 OK. 46 00:02:52,060 --> 00:02:55,680 And then and then I can actually put put that there. 47 00:02:56,080 --> 00:03:01,090 And as you can see here because I selected these are my great movies folder here. 48 00:03:01,240 --> 00:03:03,840 It's going to actually take this file here. 49 00:03:03,940 --> 00:03:04,480 OK. 50 00:03:04,570 --> 00:03:06,570 And then create a copy from this file. 51 00:03:06,700 --> 00:03:12,310 And then for example here I need to actually specify a location for saving that file in my computer. 52 00:03:12,310 --> 00:03:17,240 And then if I click on the stop here and then click on for example open. 53 00:03:17,470 --> 00:03:21,050 Now it's going to actually put this folder inside in my on my desktop. 54 00:03:21,190 --> 00:03:26,670 So as you can see here this is my desktop and I have this directory migrates movies folder. 55 00:03:26,680 --> 00:03:27,280 OK. 56 00:03:27,520 --> 00:03:29,510 So here I can actually access this folder. 57 00:03:29,650 --> 00:03:35,350 And here I've actually pulled this folder from my device and here as you can see inside this hour a 58 00:03:35,350 --> 00:03:36,410 device monitor. 59 00:03:36,430 --> 00:03:39,850 I didn't do that by using this button here. 60 00:03:40,060 --> 00:03:46,330 And here if I click on this button here push a file onto the device I can actually write another file 61 00:03:46,600 --> 00:03:49,890 and put it inside this Android device monitor. 62 00:03:50,020 --> 00:03:53,200 So here for example instead I have a picture is directed here. 63 00:03:53,440 --> 00:03:58,570 And here I have my great pictures and here for example I have this image here. 64 00:03:58,660 --> 00:04:04,300 So here in order I have in order to actually delete a file from your Android device manager you just 65 00:04:04,300 --> 00:04:10,510 need to select it and then click on this minus button here as you can see delete the selection and then 66 00:04:10,510 --> 00:04:12,820 it actually deleted this image for me. 67 00:04:12,910 --> 00:04:19,390 And if we actually want to put another image into these pictures they're here I just need to select 68 00:04:19,390 --> 00:04:25,250 the spot in here and then in it on my desktop I have another image Tiger P in G. 69 00:04:25,300 --> 00:04:31,120 If I select it and then click on open here now it's going to actually put that image here inside my 70 00:04:31,270 --> 00:04:32,380 pictures folder. 71 00:04:32,380 --> 00:04:33,880 So here I have this image. 72 00:04:33,940 --> 00:04:34,830 OK. 73 00:04:35,260 --> 00:04:37,170 So hopefully that makes sense. 74 00:04:37,180 --> 00:04:45,930 And now let's actually go back to our Android studio so here after the end in curly brace of these uncreate 75 00:04:45,930 --> 00:04:51,390 method I'm going actually pasting method and then I'm going to explain to you what's going on here. 76 00:04:52,350 --> 00:04:55,890 So as you can see here I have these Smurfette here. 77 00:04:56,010 --> 00:04:57,120 OK. 78 00:04:57,250 --> 00:04:59,060 Public file. 79 00:04:59,130 --> 00:05:05,430 So as you can see the Axis modifier of this it is public and the return type of this method is file. 80 00:05:05,520 --> 00:05:06,110 OK. 81 00:05:06,240 --> 00:05:10,150 So this is going to actually return an object of type file. 82 00:05:10,170 --> 00:05:10,710 OK. 83 00:05:10,830 --> 00:05:15,790 And then the name of this method is return storage directory for folder name. 84 00:05:15,960 --> 00:05:16,520 OK. 85 00:05:16,710 --> 00:05:19,560 And this Meffert actually accepts two arguments. 86 00:05:19,560 --> 00:05:21,260 Strange directory name. 87 00:05:21,390 --> 00:05:21,820 OK. 88 00:05:21,960 --> 00:05:22,780 And strength. 89 00:05:22,860 --> 00:05:24,320 Name of folder. 90 00:05:24,580 --> 00:05:27,060 OK so what's what's this. 91 00:05:27,110 --> 00:05:28,220 It is going to do. 92 00:05:28,260 --> 00:05:34,200 As you can see here inside our Android monitor Android device monitor we have some directories here 93 00:05:34,200 --> 00:05:38,690 some default directories alarms DC and documents or downloads. 94 00:05:38,970 --> 00:05:43,740 And inside is actually as as you can see here inside these directories such as this and download the 95 00:05:43,740 --> 00:05:44,550 directory. 96 00:05:44,550 --> 00:05:47,190 I have another directory with this custom name. 97 00:05:47,450 --> 00:05:47,900 OK. 98 00:05:48,030 --> 00:05:54,450 So if I want to actually create a directory by using my Java codes in Android or here I just need to 99 00:05:54,450 --> 00:05:55,560 use this method here. 100 00:05:55,590 --> 00:06:00,720 As you can see returns storage directory for folder name directory name and name a folder. 101 00:06:00,750 --> 00:06:06,900 OK so I use the Smurfette in order to create a directory a custom directory in my and root directory 102 00:06:06,900 --> 00:06:09,030 as you can see here in my storage. 103 00:06:09,090 --> 00:06:09,720 OK. 104 00:06:10,140 --> 00:06:17,760 So here inside is inside the body of the Smurfit I created an object of type find and the name of this 105 00:06:18,210 --> 00:06:20,070 object is a file path. 106 00:06:20,070 --> 00:06:25,280 OK so it's going to actually give me the path of the file new file here. 107 00:06:25,290 --> 00:06:31,000 I want to create an object of type find an inside Apprentice's of this class. 108 00:06:31,020 --> 00:06:34,580 Fine as you can see it is either apprentices of this class name. 109 00:06:34,620 --> 00:06:36,620 So this is the constructor OK. 110 00:06:37,260 --> 00:06:43,130 I actually first of all it refers to the environment of the Android device as you can see here. 111 00:06:43,170 --> 00:06:47,300 Environment does get external storage public directory. 112 00:06:47,370 --> 00:06:53,340 So it's going to give me access to these storage directory here as you can see so we can actually access 113 00:06:53,340 --> 00:06:54,020 these files. 114 00:06:54,060 --> 00:06:55,320 OK. 115 00:06:55,980 --> 00:07:01,470 Get External storage public directory and inside Apprentice's I'll refer to the name of this directory 116 00:07:01,470 --> 00:07:03,500 name for example. 117 00:07:03,780 --> 00:07:06,300 I want to access the download directory. 118 00:07:06,330 --> 00:07:09,110 OK so that's this argument directory name. 119 00:07:09,120 --> 00:07:09,910 Come on. 120 00:07:09,990 --> 00:07:16,140 And the second argument is name of the name of the folder that you want to create inside that directory. 121 00:07:16,140 --> 00:07:19,660 For example these these are downloads and et cetera. 122 00:07:19,980 --> 00:07:28,060 As you can see here and here I created an if else statement if file path that make directories. 123 00:07:28,260 --> 00:07:32,610 If that actually did are the result of this expression is false. 124 00:07:32,740 --> 00:07:39,600 If it cannot actually create a directory with this directory name and name a folder OK. 125 00:07:39,620 --> 00:07:50,040 If this device is if this application cannot make a directory for actually creating a folder inside 126 00:07:50,140 --> 00:07:55,170 this directory name as you can see here for example I have this download folder and I want to create 127 00:07:55,350 --> 00:07:57,190 this directory and say This downloads folder. 128 00:07:57,540 --> 00:08:03,690 If I cannot do that if file path that make directories as you can see here M-K deals stance will make 129 00:08:03,690 --> 00:08:04,460 directories. 130 00:08:04,640 --> 00:08:10,690 So if not file path here I referred to this object not to make directories. 131 00:08:10,720 --> 00:08:17,250 If we cannot actually create a data directory to that specified directory name with that name or folder 132 00:08:17,730 --> 00:08:19,940 then it's going I should execute this line of code here. 133 00:08:19,950 --> 00:08:25,460 Let's create a toast so we can actually create this method here in a minute. 134 00:08:25,740 --> 00:08:29,250 Let's create a toast and then it's going to the shortest message to the user. 135 00:08:29,280 --> 00:08:32,110 There cannot be such directory in SD card. 136 00:08:32,240 --> 00:08:32,600 OK. 137 00:08:32,610 --> 00:08:33,690 Else. 138 00:08:33,690 --> 00:08:39,930 Else if we can actually create a directory in our in that specific directory name with that specific 139 00:08:39,930 --> 00:08:43,330 name or folder then it's going to actually show this message to the user. 140 00:08:43,500 --> 00:08:49,320 Let's create a toast your folder is created and its name is name a folder. 141 00:08:49,440 --> 00:08:50,020 OK. 142 00:08:50,100 --> 00:08:55,900 And then it's going to return this file path to the color of this method OK file path. 143 00:08:55,920 --> 00:08:59,430 So now this actually creates another method with this name. 144 00:08:59,430 --> 00:09:00,830 Let's create a toast. 145 00:09:00,870 --> 00:09:07,830 So here the public and the actually the return type of this method is Voyt and the name of this method 146 00:09:07,830 --> 00:09:08,550 is list. 147 00:09:08,580 --> 00:09:10,020 Let's create a toast. 148 00:09:10,110 --> 00:09:14,400 And this is going to is going to actually accept one argument of type string as a class as you can see 149 00:09:14,400 --> 00:09:14,830 here. 150 00:09:15,040 --> 00:09:17,110 There's three in message. 151 00:09:17,970 --> 00:09:21,610 And then I need to open and close this method by using these curly braces. 152 00:09:23,090 --> 00:09:26,910 And inside this method I need to create a host object. 153 00:09:27,140 --> 00:09:32,630 So as you can see here this is the line of code that I actually pasted here toast that may taste the 154 00:09:32,630 --> 00:09:34,610 first argument is the context. 155 00:09:34,610 --> 00:09:40,970 So I passed in the context for this activity main activity that this the second one is the message that 156 00:09:41,000 --> 00:09:44,930 I want to show to the user and the first one is the duration of the message that I want to show to the 157 00:09:44,930 --> 00:09:45,410 user. 158 00:09:45,560 --> 00:09:48,860 And then I need to call the Shoma fed on this object. 159 00:09:48,860 --> 00:09:49,700 OK. 160 00:09:50,030 --> 00:09:52,430 So now as you can see the error is gone. 161 00:09:52,840 --> 00:10:00,590 And remember that if we allow the user to access that the SD card in order to write some data on the 162 00:10:00,590 --> 00:10:03,780 card or to read some data from the SD card. 163 00:10:04,030 --> 00:10:07,700 OK then this Leffert is going I should return true. 164 00:10:07,790 --> 00:10:13,880 And then it's going to allow me to access the directed specific directory and with that specific name 165 00:10:13,880 --> 00:10:18,320 a name or folder and then it's going to show me this message your father is created and his name is 166 00:10:18,530 --> 00:10:20,360 for example name a folder OK. 167 00:10:20,420 --> 00:10:29,510 And if for example if the user denied to actually the application to used the SD card then this part 168 00:10:29,510 --> 00:10:35,630 of the code is going to be executed if not a file path that makes directories so the user of the application 169 00:10:35,630 --> 00:10:40,090 is not allowed to access the card and then dismiss it is going to be shown to the user. 170 00:10:40,130 --> 00:10:42,700 There cannot be such directory in SD card. 171 00:10:42,830 --> 00:10:43,230 OK. 172 00:10:43,280 --> 00:10:49,940 Or if we have for example an order for their name in that specific directory name. 173 00:10:49,940 --> 00:10:55,430 Again we cannot actually create an order for that in that in that directory and then it's going to again 174 00:10:55,640 --> 00:10:56,590 show me this message. 175 00:10:56,600 --> 00:10:59,020 There cannot be such directories in SD card. 176 00:10:59,030 --> 00:11:03,200 So now artists actually go inside this and click method here. 177 00:11:03,260 --> 00:11:08,330 And then there's actually I'm going actually pasting some lines of code here and then I'm going to explain 178 00:11:08,330 --> 00:11:10,250 to you what's going on here. 179 00:11:10,250 --> 00:11:14,530 So as you can see here these are the lines of code that I actually pasted here. 180 00:11:14,540 --> 00:11:17,550 I created a switch statement inside this. 181 00:11:17,570 --> 00:11:18,650 Unclear method. 182 00:11:18,800 --> 00:11:21,260 So now I want to explain to you what's going on here. 183 00:11:21,260 --> 00:11:27,200 First of all as you can see here I created a switch statement and inside the practices of the switch 184 00:11:27,200 --> 00:11:33,290 statement I referred to the name of this argument that is of type view or key that we see from these 185 00:11:33,350 --> 00:11:34,210 are unclear Smurfette. 186 00:11:34,250 --> 00:11:37,470 OK the DOT get ID. 187 00:11:37,580 --> 00:11:44,210 OK so it can actually switch between the IDs of the views or buttons as you can see here we have these 188 00:11:44,210 --> 00:11:47,450 buttons or I am the animal here. 189 00:11:47,660 --> 00:11:52,700 It's going to actually switch between those items and it can actually differentiate between those buttons. 190 00:11:52,700 --> 00:11:53,280 OK. 191 00:11:53,510 --> 00:11:57,530 So remember that button is actually a subclass of view. 192 00:11:57,630 --> 00:12:01,740 OK so we can actually be fair to what happens as we use. 193 00:12:01,760 --> 00:12:02,160 OK. 194 00:12:02,270 --> 00:12:05,220 So that's why we could actually refer to this here. 195 00:12:05,370 --> 00:12:06,550 That's good idea. 196 00:12:06,560 --> 00:12:11,600 So it's going to switch between those buttons and then we can actually differentiate between the clicking 197 00:12:11,840 --> 00:12:16,090 of the buttons that is inside our emulator here. 198 00:12:16,100 --> 00:12:17,990 As you can see inside that application. 199 00:12:18,020 --> 00:12:24,740 So for example we have we have this button here we have this button and defense buttons in our application. 200 00:12:25,040 --> 00:12:31,570 So here for example case if our thought Id that's between download directory. 201 00:12:31,770 --> 00:12:36,920 If for example the user clicks on this button let's make it directly to downloads folder OK. 202 00:12:37,100 --> 00:12:42,590 If the user clicks on the spot in our That ID that's between download directory then it's going to actually 203 00:12:42,590 --> 00:12:44,380 execute this line of code here. 204 00:12:44,380 --> 00:12:45,230 Return. 205 00:12:45,230 --> 00:12:51,360 So here I am referring to that specific method that that I actually created here as you can see here. 206 00:12:51,470 --> 00:12:57,190 Return storage directory for folder name so you can actually create a directory inside this or that. 207 00:12:57,240 --> 00:13:00,780 Inside the download directory that we have in our Android money. 208 00:13:00,860 --> 00:13:07,330 So as you can see here inside our downloads folder we can actually create a directory. 209 00:13:07,430 --> 00:13:14,360 So here as you can see I am saying that return storage directory for folder name environment directory 210 00:13:14,360 --> 00:13:15,140 downloads. 211 00:13:15,140 --> 00:13:17,090 So it can actually are repairing. 212 00:13:17,300 --> 00:13:23,040 We can actually filter these are directory download environment that directory downloads. 213 00:13:23,120 --> 00:13:27,220 And here for the second argument when it was specified a folder name. 214 00:13:27,260 --> 00:13:33,600 So it can actually create a folder called Nice called nice downloads as you can see here inside the 215 00:13:34,190 --> 00:13:35,390 directory downloads. 216 00:13:35,540 --> 00:13:36,030 OK. 217 00:13:36,140 --> 00:13:40,550 And then it's actually a break outside of this switch statement. 218 00:13:40,580 --> 00:13:45,380 So let me explain again here we are calling this Smurfette return storage directory for folder name 219 00:13:45,680 --> 00:13:47,840 environment that directory downloads. 220 00:13:47,840 --> 00:13:53,330 So it's so it can actually create a directory inside this downloads directory here inside the storage 221 00:13:53,330 --> 00:13:54,290 folder. 222 00:13:54,420 --> 00:13:56,300 And we did this with this name. 223 00:13:56,310 --> 00:13:57,330 Nice that. 224 00:13:57,440 --> 00:13:57,890 OK. 225 00:13:58,010 --> 00:14:02,750 So let's actually stop here and run our application and see what happens. 226 00:14:02,750 --> 00:14:07,300 So as you can see here all of the application is actually running on this emulator. 227 00:14:07,400 --> 00:14:13,820 And now if I want to actually make this keyboard this keyboard disappear I just click on this leather 228 00:14:13,820 --> 00:14:18,410 triangle here and now as you can see this keyboard is gone. 229 00:14:18,410 --> 00:14:20,770 And now as you can see I have this button. 230 00:14:20,810 --> 00:14:23,530 OK let's make a that to download directory. 231 00:14:23,550 --> 00:14:29,830 So I created as a case statement here case or that ID that between the download directory if the user 232 00:14:29,830 --> 00:14:33,950 clicks on the spot and then it's going to execute this line of code here. 233 00:14:34,270 --> 00:14:41,140 So let's actually click on this button here your folder is created and its name is nice downloads and 234 00:14:41,140 --> 00:14:42,440 now it's actually open. 235 00:14:42,450 --> 00:14:46,420 Are Android monitor as you can see here inside this download directory. 236 00:14:46,430 --> 00:14:47,690 We have this folder. 237 00:14:47,800 --> 00:14:49,940 Nice downloads as you can see here. 238 00:14:50,050 --> 00:14:50,520 OK. 239 00:14:50,620 --> 00:14:53,890 So now let's actually go back to what Android studio again here. 240 00:14:54,150 --> 00:15:02,590 Here we have this case here are that idea that between music directory if the user clicks on this button 241 00:15:02,590 --> 00:15:05,760 here let's make our directory to music folder. 242 00:15:05,930 --> 00:15:10,240 Or that idea that music throatily then is going to actually execute this line of code here. 243 00:15:10,240 --> 00:15:16,300 Return storage directory for folder name environment directory music. 244 00:15:16,440 --> 00:15:16,860 OK. 245 00:15:16,930 --> 00:15:23,440 So it's going to actually go inside this android monitor here as you can see if you have this music 246 00:15:23,440 --> 00:15:25,040 directory as you can see here. 247 00:15:25,210 --> 00:15:26,110 OK. 248 00:15:26,170 --> 00:15:29,010 And then it can actually go inside this music directory. 249 00:15:29,080 --> 00:15:33,980 So it's going to go inside is music directory as you can see here for example. 250 00:15:34,090 --> 00:15:38,800 And then it's going to actually create a folder with this name. 251 00:15:38,830 --> 00:15:41,260 Nice musics as you can see here. 252 00:15:41,380 --> 00:15:44,090 And then it's going to break out of this switch statements. 253 00:15:44,110 --> 00:15:46,080 So it's actually so. 254 00:15:46,120 --> 00:15:52,550 Now in our are actually as you can see here in our emulator now to actually click on this button. 255 00:15:52,690 --> 00:15:55,790 Let's make a directory to music folder. 256 00:15:55,810 --> 00:16:01,700 So if I click on it now it says your folder is created and its name is nice musics. 257 00:16:01,770 --> 00:16:07,210 So let's actually open our and rate monitor and now inside this music directory we can see this Walder 258 00:16:07,380 --> 00:16:08,410 nice music. 259 00:16:08,660 --> 00:16:09,260 OK. 260 00:16:10,480 --> 00:16:16,270 And now we have another case statement here are that idea that PTEN documents folder. 261 00:16:16,420 --> 00:16:22,930 So it's going actually as you can see here if the user clicks on the clicks on this button here let's 262 00:16:22,930 --> 00:16:24,960 make a directory to documents folder. 263 00:16:25,150 --> 00:16:30,280 Then it can actually create for example a folder with this name. 264 00:16:30,280 --> 00:16:36,250 Nice documents inside this directory environment that directory documents. 265 00:16:36,250 --> 00:16:39,590 And in our Android device monitor as you can see here. 266 00:16:39,700 --> 00:16:45,070 If I open these documents folder here now you can see this file here. 267 00:16:45,100 --> 00:16:46,450 Nice documents. 268 00:16:46,480 --> 00:16:47,590 You can see this folder. 269 00:16:47,680 --> 00:16:47,960 OK. 270 00:16:47,980 --> 00:16:49,420 Nice comments. 271 00:16:49,510 --> 00:16:56,370 And now we have another case statements case statement are that Id thoughts are between link ringtones 272 00:16:56,380 --> 00:16:56,870 folder. 273 00:16:56,890 --> 00:17:05,170 So if the user clicks on this button let's make our directory to our ringtones folder as you can see 274 00:17:05,170 --> 00:17:06,150 here. 275 00:17:06,310 --> 00:17:12,240 And then this line of code is going to be executed return storage directory for a folder name environment 276 00:17:12,610 --> 00:17:14,140 that directory ringtones. 277 00:17:14,200 --> 00:17:19,940 So it can actually go inside the house and really monitor as you can see here we have a directory called 278 00:17:19,960 --> 00:17:20,690 ringtones. 279 00:17:20,770 --> 00:17:24,560 As you can see here it's actually find districted here. 280 00:17:24,570 --> 00:17:26,070 It is the directory. 281 00:17:26,380 --> 00:17:31,180 And inside this directory is going to actually create a folder with that name. 282 00:17:31,250 --> 00:17:33,010 Nine nice ringtones. 283 00:17:33,010 --> 00:17:33,840 OK. 284 00:17:33,850 --> 00:17:37,590 So let's actually go inside our emulator. 285 00:17:37,750 --> 00:17:42,950 And now I want to actually click on the spot and let's make our directory touring tours folder. 286 00:17:43,240 --> 00:17:46,980 And it says your folder is created and its name is nice. 287 00:17:47,010 --> 00:17:48,320 All right ringtones. 288 00:17:48,520 --> 00:17:50,290 And here we can see these folders. 289 00:17:50,440 --> 00:17:54,040 Nice ring tones inside our ringtones directory. 290 00:17:54,490 --> 00:17:55,750 And now let's get you to go inside. 291 00:17:55,750 --> 00:17:58,350 These are Android stood you here. 292 00:17:58,750 --> 00:18:02,840 And if you have these are that I.D. that Pythian pod cast for there. 293 00:18:02,890 --> 00:18:08,500 Again this can actually go inside this podcast directory and then it's going to create this folder. 294 00:18:08,530 --> 00:18:09,970 Nice podcasts. 295 00:18:10,000 --> 00:18:14,960 So let's actually open our emulator here are here I want to actually create. 296 00:18:15,040 --> 00:18:16,380 Click on this button. 297 00:18:16,660 --> 00:18:23,260 Let's make a directory to podcast folder and it says your father is created and its name is nice podcasts 298 00:18:23,590 --> 00:18:30,930 and now in our Android monitor let's actually find the podcast directory here. 299 00:18:31,180 --> 00:18:33,640 For example this is our podcast directory. 300 00:18:33,640 --> 00:18:37,560 And if I open it now we can see these folders nice podcasts. 301 00:18:37,660 --> 00:18:43,760 And if I actually click on this button here again let's make a directory to podcast folder. 302 00:18:43,780 --> 00:18:49,990 Now it says there cannot be such directory in SD card because we already have this folder with this 303 00:18:49,990 --> 00:18:50,850 name here. 304 00:18:50,860 --> 00:18:54,730 OK so it cannot actually create the same folder twice. 305 00:18:54,730 --> 00:19:00,880 So let's actually go back inside our Android studio here we have movies folder here it's going to truly 306 00:19:00,910 --> 00:19:07,510 create a directory environment that directory movies nice movies and plan for their environment that 307 00:19:07,560 --> 00:19:08,630 created the alarms. 308 00:19:08,650 --> 00:19:09,730 Nice alarms. 309 00:19:09,730 --> 00:19:14,620 And here we have pictures for their environment that directory pictures nice pictures. 310 00:19:14,620 --> 00:19:17,790 So let's go back in our hour emulator. 311 00:19:17,950 --> 00:19:23,150 And now if we want to actually click on this button let's make a directory to move movies folder. 312 00:19:23,380 --> 00:19:26,140 And it says your father is created and its name is. 313 00:19:26,140 --> 00:19:27,220 Nice movies. 314 00:19:27,220 --> 00:19:35,470 So now if I open our Android device monitor now here inside our movies folder we have these nice movies 315 00:19:35,470 --> 00:19:37,560 directory as you can see here. 316 00:19:37,630 --> 00:19:43,780 Now if I actually click on these for example this let's make I directed it to pictures folder. 317 00:19:43,810 --> 00:19:48,640 Now if I actually open my pictures folder here it says Nice pictures. 318 00:19:48,640 --> 00:19:53,050 Now if I actually click on this little match I directed it to alarm's folder again. 319 00:19:53,360 --> 00:19:57,460 It's directory is created on here inside our alarm's folder. 320 00:19:57,580 --> 00:20:00,000 I have these nice alarms here. 321 00:20:00,130 --> 00:20:00,730 OK. 322 00:20:00,940 --> 00:20:03,030 So hopefully that makes sense. 323 00:20:03,160 --> 00:20:08,260 And now it's actually putting some more lines of code in our class and then I'm going to explain to 324 00:20:08,260 --> 00:20:09,720 you what's going on here. 325 00:20:09,820 --> 00:20:17,950 OK so now I want to actually save RTX the file in my Actually in my documents folder as you can see 326 00:20:17,950 --> 00:20:18,500 here. 327 00:20:18,820 --> 00:20:25,780 For example I went to actually typing typing something here in this on this textfield here and there 328 00:20:25,840 --> 00:20:32,380 I want to actually click on these saved documents folder in as the cart button and then it can actually 329 00:20:32,380 --> 00:20:35,770 create a text file in my documents folder. 330 00:20:35,770 --> 00:20:42,040 So as you can see here in an Android device monitor here I have these documents folder and I want to 331 00:20:42,040 --> 00:20:45,360 actually create a text file in these documents folder. 332 00:20:45,580 --> 00:20:46,230 OK. 333 00:20:46,510 --> 00:20:52,660 And then I'm going to actually put in the values that the user enter in say these are added text here 334 00:20:53,050 --> 00:20:57,080 and then can actually put these values in that are certified. 335 00:20:57,160 --> 00:20:57,510 OK. 336 00:20:57,580 --> 00:20:59,230 So let's see how we can do that. 337 00:20:59,440 --> 00:21:05,950 Let's go back to our Android studio and here I want to actually pasted our method here and then I'm 338 00:21:05,950 --> 00:21:08,740 going to explain to you what's going on here. 339 00:21:08,980 --> 00:21:12,910 So as the here this is them after they actually paste that here as you can see. 340 00:21:12,910 --> 00:21:17,170 So as you can see here the access modifier of this method is public. 341 00:21:17,410 --> 00:21:19,650 The return type of this Smurfit is void. 342 00:21:19,930 --> 00:21:26,980 The name of the Smurfit is let's say file two documents folder and this if it doesn't accept any arguments 343 00:21:27,550 --> 00:21:32,380 and as you can see here inside the body of the Smurfit I have these lines of code here. 344 00:21:32,380 --> 00:21:36,220 First of all I created an object of type find. 345 00:21:36,370 --> 00:21:37,080 OK. 346 00:21:37,150 --> 00:21:39,450 And the name of this object is a file path. 347 00:21:39,460 --> 00:21:47,410 So it's going to actually give me the file path to that specific defined so file file path assignment 348 00:21:47,440 --> 00:21:50,060 operator new file. 349 00:21:50,290 --> 00:21:56,370 So as you can see here inside the prentices environment that gets external storage public directories 350 00:21:56,380 --> 00:22:03,730 so it can actually give me access to the SD card to get external storage or public directory environment 351 00:22:03,790 --> 00:22:05,320 that directory documents. 352 00:22:05,320 --> 00:22:11,500 So I want to actually access the documents folder and then I want to actually put this file in in that 353 00:22:11,890 --> 00:22:12,880 directory. 354 00:22:12,910 --> 00:22:14,900 Nice file that the. 355 00:22:15,340 --> 00:22:19,980 So here we have a try catch exception exception here as you can see. 356 00:22:19,990 --> 00:22:24,960 So inside this a statement as you can see I have file output stream. 357 00:22:25,030 --> 00:22:32,660 So this object can actually help me to actually output some file to some directories to some files so 358 00:22:32,690 --> 00:22:33,860 file path. 359 00:22:33,980 --> 00:22:40,670 So so file output string and the name of this object is a file output stream new file output stream. 360 00:22:40,720 --> 00:22:45,760 And here we need to pass the path that you want to actually save that object. 361 00:22:45,760 --> 00:22:47,930 For example this nice find that 60. 362 00:22:47,980 --> 00:22:49,180 So here is the path. 363 00:22:49,200 --> 00:22:50,180 OK. 364 00:22:50,520 --> 00:22:53,640 And here as you can see output stream writer. 365 00:22:53,840 --> 00:23:01,270 OK so here I have an object of type output stream writer and the name of this object is output stream 366 00:23:01,270 --> 00:23:02,040 writer. 367 00:23:02,050 --> 00:23:08,500 So let's actually go back to our Android documentation and let's see what does these objects do ok for 368 00:23:08,500 --> 00:23:12,050 example this file output stream or the output stream later. 369 00:23:12,100 --> 00:23:19,180 So now let's actually open our browser and now our I mean the Android documentation developer that Android 370 00:23:19,180 --> 00:23:25,610 dot com and inside the search bar here I want to actually search for file output stream. 371 00:23:25,630 --> 00:23:30,020 So here as you can see I have this fight output stream here Android API. 372 00:23:30,370 --> 00:23:35,890 And as you can see here this class is a public class and this class actually extends from the output 373 00:23:35,890 --> 00:23:36,720 stream class. 374 00:23:36,790 --> 00:23:37,400 OK. 375 00:23:37,780 --> 00:23:43,750 And here as you can see this output stream class action is fight with stream class extends from this 376 00:23:43,750 --> 00:23:48,360 output stream class and this output stream class extends from this object class. 377 00:23:48,370 --> 00:23:55,170 So here we have some direct subclasses parsel file descriptor and auto output stream. 378 00:23:55,270 --> 00:24:01,600 And here as you can see we have some oughtnt known indirect class subclasses assets file descriptor 379 00:24:01,600 --> 00:24:03,550 and auto closed output stream. 380 00:24:03,790 --> 00:24:09,640 So here is that is the description for this file output stream class of file output stream is an output 381 00:24:09,640 --> 00:24:17,640 stream for writing data to a file or to a file descriptor whether or not a file is available or maybe 382 00:24:17,650 --> 00:24:20,970 created depends upon the underlying platform. 383 00:24:21,220 --> 00:24:29,260 Some platforms in particular allow a file to be opened for writing by only one file output stream or 384 00:24:29,320 --> 00:24:32,050 other file writing object at a time. 385 00:24:32,110 --> 00:24:38,820 In such situations the constructor in this class will fail if the file involved is already open. 386 00:24:38,970 --> 00:24:47,380 OK so fall out with file output stream is meant for writing streams of raw bytes such as image data 387 00:24:47,950 --> 00:24:50,310 for writing streams of characters. 388 00:24:50,470 --> 00:24:52,540 Considering using file writer. 389 00:24:52,720 --> 00:24:53,280 OK. 390 00:24:53,440 --> 00:24:54,910 And here we have some summary. 391 00:24:54,940 --> 00:25:01,310 Probably constructor's file output stream name file with stream name are boolean append. 392 00:25:01,450 --> 00:25:06,810 So it creates a file with the output stream to write to the file with a specified name. 393 00:25:06,960 --> 00:25:14,200 OK and we have file output stream file creates a file output stream to write to the file represented 394 00:25:14,200 --> 00:25:16,710 by the specified file object. 395 00:25:16,810 --> 00:25:22,900 If you have a fight with a stream file boolean append and here as you can see creates a file output 396 00:25:22,900 --> 00:25:30,240 stream to write to the file represented by this specified file object file with the stream file descriptor. 397 00:25:30,370 --> 00:25:30,860 OK. 398 00:25:31,000 --> 00:25:37,210 And we have some public methods which we can use on the file output stream object as you can see here. 399 00:25:37,270 --> 00:25:40,520 We have finalized Meffert and we have some other methods. 400 00:25:40,720 --> 00:25:43,880 So here as you can see we used this method. 401 00:25:44,080 --> 00:25:49,660 OK first of all I created an object of type file output stream and then as you can see I actually assigned 402 00:25:49,720 --> 00:25:51,780 this path to the constructor. 403 00:25:51,820 --> 00:25:56,060 So here as you can see we use this constructor here. 404 00:25:56,160 --> 00:26:02,320 It creates a file output stream to write to the file represented by the specified object. 405 00:26:02,320 --> 00:26:05,220 OK so here we have it out with the string here. 406 00:26:05,320 --> 00:26:08,590 I created an output stream of writer object. 407 00:26:08,620 --> 00:26:12,150 So let's see what the output stimulated right Optik outputs 408 00:26:14,620 --> 00:26:24,230 stream writer so as you can see here inside the Android API we have this upped class output stream right 409 00:26:24,230 --> 00:26:24,800 here. 410 00:26:25,170 --> 00:26:28,800 And as you can see here this is a public class output stream. 411 00:26:28,800 --> 00:26:29,140 Right. 412 00:26:29,160 --> 00:26:32,210 And this class extends from the writer class. 413 00:26:32,670 --> 00:26:38,730 And here it is there as you can see we can see that this output stream right the class is inheriting 414 00:26:38,790 --> 00:26:45,390 all of the features and behaviors of this writer class and this writer class inherits all of the features 415 00:26:45,690 --> 00:26:47,640 and behaviors of this object class. 416 00:26:47,760 --> 00:26:51,680 And here we have known subclasses file writer. 417 00:26:51,750 --> 00:26:57,760 So here is the description of this output stream right here and output stream writer is a breach from 418 00:26:57,780 --> 00:27:05,610 characteris streams to byte streams characters written tweets are encoded into bytes using a specified 419 00:27:05,610 --> 00:27:13,350 charset the charset that it used that it uses maybe specified by name or maybe even explicitly or the 420 00:27:13,350 --> 00:27:20,460 platform's default charset may be except that each invocation of a right method causes the encoding 421 00:27:20,460 --> 00:27:29,190 converter to be invoked on the given characters the resulting bytes are accumulated in a buffer before 422 00:27:29,400 --> 00:27:33,240 being written to the to the underlying output stream. 423 00:27:33,450 --> 00:27:41,420 The size of this buffer may be specified specified but by default it is a large enough for most purposes. 424 00:27:41,470 --> 00:27:48,210 OK so if we can specify the size of the buffer but by default it is large enough for most purposes. 425 00:27:48,630 --> 00:27:54,960 Note that the characters passed to the right methods are not buffered for top efficiency. 426 00:27:54,960 --> 00:28:01,620 Consider wrapping an output string later within a buffer iterator so as to avoid frequent converters 427 00:28:01,950 --> 00:28:10,200 invocations for example we have an example here as you can see and here we have some other descriptions. 428 00:28:10,200 --> 00:28:12,570 So let's go back to what Android studio here. 429 00:28:12,570 --> 00:28:17,970 We have an output stream right an object output stream new output stream file output stream. 430 00:28:18,030 --> 00:28:24,040 Ok so it can actually convert this object file output stream into bytes. 431 00:28:24,060 --> 00:28:28,810 As you can see here it says characters written to it are encoded into bytes. 432 00:28:28,850 --> 00:28:29,460 OK. 433 00:28:29,850 --> 00:28:34,820 And here we have actually DMF it's the constructor's as you can see here. 434 00:28:34,830 --> 00:28:38,880 Output stream out with street and other constructors. 435 00:28:38,910 --> 00:28:39,660 OK. 436 00:28:39,930 --> 00:28:46,000 So here as you can see here I referred to the name of this object output stream right here. 437 00:28:46,050 --> 00:28:47,270 That's the abend. 438 00:28:47,470 --> 00:28:51,100 OK here I want to actually append some data to this output. 439 00:28:51,120 --> 00:28:52,350 Inviter OK. 440 00:28:52,560 --> 00:28:53,670 EDT value here. 441 00:28:53,700 --> 00:28:55,920 I referred to this object. 442 00:28:55,920 --> 00:29:01,010 It is de-value Let's actually open our emulator as you can see we have this Edhi text here. 443 00:29:01,020 --> 00:29:06,570 I want to actually append the values that the user enter are in this text. 444 00:29:06,570 --> 00:29:09,750 I want to append this value to this output assimilator object. 445 00:29:09,750 --> 00:29:10,130 OK. 446 00:29:10,180 --> 00:29:12,430 It is the body that takes the two strings. 447 00:29:12,570 --> 00:29:12,970 OK. 448 00:29:13,020 --> 00:29:17,970 And here I referred to the name of this object agame output stream right at that close. 449 00:29:17,970 --> 00:29:23,790 So we need to close this output stream later and then we need to close this file output stream close 450 00:29:23,880 --> 00:29:31,680 as you can see here we have to close this object before we actually reach the end of this curly braces 451 00:29:31,680 --> 00:29:33,620 for this Troy statement. 452 00:29:33,720 --> 00:29:36,490 As you can see here file output with streamlet close. 453 00:29:36,690 --> 00:29:42,740 And then here I want to show a message to the user that the file is actually saved in the SD card. 454 00:29:42,810 --> 00:29:43,310 OK. 455 00:29:43,380 --> 00:29:45,520 Let's create a toast saved. 456 00:29:45,570 --> 00:29:46,190 OK. 457 00:29:46,560 --> 00:29:49,940 And that here we have a catch statement catch exception. 458 00:29:49,950 --> 00:29:56,890 So if the if some errors happen during the for example saving the data out the in the SD card then it 459 00:29:56,940 --> 00:30:02,310 can actually catch the exception lock that I lug it out with string so it's going to actually give me 460 00:30:02,580 --> 00:30:05,690 a string representation of the exception that has occurred. 461 00:30:05,850 --> 00:30:08,100 And then I want to show a message to the user. 462 00:30:08,130 --> 00:30:11,140 Let's create a tossed exception occurred check the lock. 463 00:30:11,220 --> 00:30:12,350 For more info. 464 00:30:12,590 --> 00:30:17,770 Ok so now let's actually go back to our unclear method as you can see here. 465 00:30:18,190 --> 00:30:20,760 Now I want to create another case statement. 466 00:30:20,760 --> 00:30:24,840 Chase are thought Id dot PTEN. 467 00:30:24,840 --> 00:30:26,650 Safe flight. 468 00:30:26,730 --> 00:30:30,080 OK let's let me actually create a break statement here. 469 00:30:30,090 --> 00:30:35,250 So if the user clicks on this for example it's opened the emulator. 470 00:30:35,310 --> 00:30:40,590 If they use it click on the spot in say two documents folder in SD card. 471 00:30:40,790 --> 00:30:47,440 OK I want to actually get the data that is inside this edit text here and then I want to actually save 472 00:30:47,440 --> 00:30:54,050 it in a text file inside the SD card inside the documents folder documents directory. 473 00:30:54,270 --> 00:31:00,330 So let's see how we can do that first because we have a method here that does actually do this job for 474 00:31:00,330 --> 00:31:03,210 us saving that data to documents folder. 475 00:31:03,360 --> 00:31:05,520 Here I just need to refer to the Smurfette. 476 00:31:06,090 --> 00:31:12,580 And here I just can't just type in let's say file two documents folder. 477 00:31:12,960 --> 00:31:13,580 OK. 478 00:31:13,980 --> 00:31:18,930 And now let's actually run our project and see what happens. 479 00:31:18,930 --> 00:31:23,590 So now as you can see here our application is actually running on this emulator. 480 00:31:23,700 --> 00:31:24,300 OK. 481 00:31:24,510 --> 00:31:27,060 And now here this is our textfield here. 482 00:31:27,090 --> 00:31:28,090 This is our editor. 483 00:31:28,290 --> 00:31:31,260 And now we want to actually for example type in my own name. 484 00:31:31,410 --> 00:31:32,600 Mortiser. 485 00:31:32,880 --> 00:31:37,690 And then let's let me actually disappear this keyboard and now I want to actually click on the spot 486 00:31:37,720 --> 00:31:41,050 and save it to documents folder in as the cost. 487 00:31:41,130 --> 00:31:42,520 And it is saved. 488 00:31:42,780 --> 00:31:46,230 So let's actually open or open our Android device monitor. 489 00:31:46,590 --> 00:31:49,020 And let's actually find the documents directory. 490 00:31:49,020 --> 00:31:51,930 So this is our documents directory and this is my file. 491 00:31:51,990 --> 00:31:53,660 Nice file that you see. 492 00:31:53,790 --> 00:32:00,930 So remember in our Android studio when I actually created that Mefford let's say file to documents folder 493 00:32:00,960 --> 00:32:02,060 as you can see here. 494 00:32:02,160 --> 00:32:05,540 I decided to create a text file with this name. 495 00:32:05,550 --> 00:32:09,040 Nice find and in an Android device monitor you can see these files. 496 00:32:09,060 --> 00:32:13,610 So let's actually put this file in the on the desktop. 497 00:32:13,710 --> 00:32:19,200 So I just need to click on this button and then here is going to ask me to save this file here. 498 00:32:19,240 --> 00:32:23,360 I want to save it on the desktop and then click on Save. 499 00:32:23,460 --> 00:32:25,700 So let's actually go back to our desktop. 500 00:32:25,710 --> 00:32:29,620 So as you can see here this is my desktop and this is my file. 501 00:32:29,670 --> 00:32:31,280 Nice file that takes the. 502 00:32:31,410 --> 00:32:33,660 And now if I open it let's see what happens. 503 00:32:33,660 --> 00:32:37,000 And as you can see here I have this value here mortars. 504 00:32:37,140 --> 00:32:37,940 OK. 505 00:32:38,400 --> 00:32:42,690 And that is the same value that I entered inside this edit text. 506 00:32:42,690 --> 00:32:44,940 So now it's actually to change the value. 507 00:32:44,970 --> 00:32:48,000 For example I want to type in another thing for example. 508 00:32:48,000 --> 00:32:49,420 Nice. 509 00:32:50,350 --> 00:32:56,400 And now let me actually make this keyboard disappear and if I click on this button again it says safe. 510 00:32:56,430 --> 00:32:57,150 OK. 511 00:32:57,150 --> 00:33:00,590 So let's actually open our Android device monitor again. 512 00:33:00,600 --> 00:33:04,010 So as a test here this is my Android device monitor. 513 00:33:04,050 --> 00:33:07,950 And here again I want to actually put this awide in my desktop. 514 00:33:08,040 --> 00:33:12,850 So here I just need to select it and click on the spot in safe. 515 00:33:13,080 --> 00:33:17,870 And now if I click double click on these textfile here again. 516 00:33:17,880 --> 00:33:24,160 And now let me actually open this nice file that takes the fight again and here again we can see this 517 00:33:24,180 --> 00:33:24,950 value. 518 00:33:24,960 --> 00:33:25,760 Nice. 519 00:33:26,090 --> 00:33:26,680 OK. 520 00:33:27,000 --> 00:33:28,670 So hopefully that makes sense. 521 00:33:28,830 --> 00:33:32,460 And now here I want to do another thing here here. 522 00:33:32,580 --> 00:33:39,060 I want to let the user to click on this button retrieve the information from the SD card and then get 523 00:33:39,060 --> 00:33:40,620 this value that is inside. 524 00:33:40,640 --> 00:33:42,680 This takes the file and put it inside. 525 00:33:42,680 --> 00:33:44,390 These are text view here. 526 00:33:44,490 --> 00:33:44,950 OK. 527 00:33:45,120 --> 00:33:46,760 So let's see how we can do that. 528 00:33:46,770 --> 00:33:50,070 So let's actually open the Android studio. 529 00:33:50,190 --> 00:33:53,580 So now I want to actually do another film here. 530 00:33:53,730 --> 00:33:59,070 For example when the user clicks on these button as you can see here and the user clicks on this button 531 00:33:59,230 --> 00:34:04,770 all you want to get the data that is inside that the inside of the file that we actually saved when 532 00:34:04,770 --> 00:34:08,260 the user clicks on these CB2 documents folder in SD card. 533 00:34:08,460 --> 00:34:15,840 I want to get those data that is actually inside of that specific to the file and then display it here 534 00:34:15,990 --> 00:34:17,580 and these are tapes view here. 535 00:34:17,640 --> 00:34:25,200 So in order to do that job here first need to actually create a method here inside of our main activity 536 00:34:25,200 --> 00:34:25,940 class. 537 00:34:26,010 --> 00:34:31,560 So after the end in curly brace of these or let's say five to eight commands for the effort he had to 538 00:34:31,560 --> 00:34:32,800 actually create Smurfette. 539 00:34:32,850 --> 00:34:33,290 OK. 540 00:34:33,450 --> 00:34:37,470 So I'm going to paste in my fate on the head here and then I'm going to explain to you what's going 541 00:34:37,470 --> 00:34:38,120 on here. 542 00:34:38,130 --> 00:34:43,630 So as you can see here this is the method that they actually pasted here inside this main activity class. 543 00:34:43,650 --> 00:34:44,160 OK. 544 00:34:44,310 --> 00:34:48,480 So first of all let me tell you that the access modifier of this method is public. 545 00:34:48,660 --> 00:34:54,870 The return type of this method is Voyt and the name of the Smif is let's retrieve five data up from 546 00:34:54,870 --> 00:34:59,260 documents folder and this method is not going to accept any arguments. 547 00:34:59,460 --> 00:35:04,680 So as you can see here inside the body of the Smurfette we have some lines of code here. 548 00:35:04,680 --> 00:35:08,140 So first of all I created an object of type file. 549 00:35:08,220 --> 00:35:08,710 OK. 550 00:35:08,850 --> 00:35:11,480 And the name of this object is file path. 551 00:35:11,550 --> 00:35:18,660 And as you can see here if you have an object of type find new file and inside the practices as you 552 00:35:18,660 --> 00:35:23,370 can see environment does get external storage public directory. 553 00:35:23,370 --> 00:35:29,280 So here you want to access the SD card environment that directory documents and you want to access the 554 00:35:29,280 --> 00:35:32,300 documents folder inside the SD card. 555 00:35:32,400 --> 00:35:38,390 So now as you can see for such an argument I need to actually give the name of the file. 556 00:35:38,460 --> 00:35:40,110 Nice file that takes the. 557 00:35:40,210 --> 00:35:43,680 So I can see here you have the next the same file here. 558 00:35:43,680 --> 00:35:44,740 Nice file that. 559 00:35:44,880 --> 00:35:45,670 As you can see. 560 00:35:45,740 --> 00:35:50,290 But here inside the Smurfette let's say file two documents folder. 561 00:35:50,310 --> 00:35:57,630 I just wanted to actually save this file inside the SD card but for the Smurfette in here I want to 562 00:35:57,630 --> 00:36:04,110 actually get the data that is inside of this wide nice file that you XTi so be sure that that that the 563 00:36:04,110 --> 00:36:09,790 name of this file is the same as the name of this flight that you actually put inside these let's say 564 00:36:09,800 --> 00:36:11,960 filed two documents with their method. 565 00:36:12,230 --> 00:36:20,680 So now as you can see here we have a try catch accept statement here OK try and here as you can see 566 00:36:20,860 --> 00:36:26,380 inside these curly braces here I have an object of type file input stream. 567 00:36:26,450 --> 00:36:26,720 OK. 568 00:36:26,720 --> 00:36:29,730 And the name of this object these file input is Stream. 569 00:36:29,780 --> 00:36:36,230 And here I want to actually create an object of type file file input stream by just putting the new 570 00:36:36,230 --> 00:36:40,360 keyboard file input stream file path as you can see here. 571 00:36:40,370 --> 00:36:45,820 So here I give this a file path here to the constructor of this flight input stream. 572 00:36:45,830 --> 00:36:50,580 So let's actually go inside the documentation in order to see what is this fight input stream. 573 00:36:50,660 --> 00:36:55,570 So file input string. 574 00:36:55,620 --> 00:36:57,890 So here I can't just select it. 575 00:36:58,080 --> 00:37:01,340 And now here is the documentation for this class. 576 00:37:01,620 --> 00:37:04,490 And as you can see here this class is actually a public class. 577 00:37:04,590 --> 00:37:12,210 And as you can see this class extends from the input stream class and now we have some direct some classes 578 00:37:12,270 --> 00:37:15,140 and some and some indirect subclasses. 579 00:37:15,510 --> 00:37:24,030 And here it says a file input stream obtains input bytes from a file in a file system what files are 580 00:37:24,030 --> 00:37:31,350 available depends on the host environment file input stream is meant for reading streams of raw bytes 581 00:37:31,530 --> 00:37:37,710 such as image data for reading streams of characters consider using a file reader. 582 00:37:38,190 --> 00:37:40,890 So here is the summary file input stream. 583 00:37:40,950 --> 00:37:47,040 And here we can see the constructors and here we can see the methods that is related to this class. 584 00:37:47,340 --> 00:37:54,600 And now as you can see we have 5 input stream in order to read the data that is inside the nice fidelity 585 00:37:54,690 --> 00:37:55,440 XTi. 586 00:37:55,740 --> 00:38:00,040 And here I have a buffered reader object so buffered the reader here. 587 00:38:00,100 --> 00:38:06,180 If you have a buffer to read or object as you can see here a new buffer the reader and as you can see 588 00:38:06,180 --> 00:38:12,420 inside the prentices I created another object by putting the new keyboard new input stream reader. 589 00:38:12,480 --> 00:38:18,090 So first of all let's go inside the documentation in order to see what is the Spofforth reader. 590 00:38:18,090 --> 00:38:22,220 So let's actually open our browser here inside the search bar. 591 00:38:22,410 --> 00:38:25,620 I just need to put this a class name buffer at the reader. 592 00:38:25,620 --> 00:38:26,130 Double that. 593 00:38:26,130 --> 00:38:28,910 Are you that Buffle reader inside the Android API eyes. 594 00:38:28,920 --> 00:38:35,160 And now let's see what is this class Puplick class Spofforth reader extends the reader class OK. 595 00:38:35,530 --> 00:38:42,780 And as you can see here it says Reith's text from a character input stream buffer into characters so 596 00:38:42,780 --> 00:38:48,360 as to provide for the efficient reading of characters arrows and lines. 597 00:38:48,360 --> 00:38:53,540 Def buffer size may be specified or the default size may be used. 598 00:38:53,630 --> 00:38:57,040 The default is large enough for most purposes. 599 00:38:57,210 --> 00:39:04,440 In general each read request made of a reader causes a corresponding greet request to be made up. 600 00:39:04,470 --> 00:39:08,070 Underline character of byte stream. 601 00:39:08,100 --> 00:39:15,450 It is therefore advisable to wrap a buffer reader around any reader who's read operations may be costly 602 00:39:15,450 --> 00:39:18,790 such as file readers and input stream readers. 603 00:39:18,900 --> 00:39:22,410 So as you can see here we have this example here. 604 00:39:22,410 --> 00:39:25,050 So now let's actually go back to what I wrote stood studio. 605 00:39:25,080 --> 00:39:29,100 So here we have the Spufford that object in order to read the data. 606 00:39:29,460 --> 00:39:32,550 And here we have our input the stream reader. 607 00:39:32,550 --> 00:39:41,320 OK so let's actually go inside the documentation in order to search for the input stream reader. 608 00:39:41,340 --> 00:39:42,510 So let's actually click on it. 609 00:39:42,510 --> 00:39:48,810 So now here you can see the documentation for input stream reader class as you can see this class extends 610 00:39:49,020 --> 00:39:55,210 from the reader class and here it says an input stream reader is a breach from byte streams to the character 611 00:39:55,220 --> 00:40:02,340 streams it reads bytes and decode them into characters using a specified charset the charset that it 612 00:40:02,340 --> 00:40:10,400 uses may be specified by name or may be given explicitly or the platform's default charset may be accepted. 613 00:40:10,440 --> 00:40:18,000 Each invocation of one of an input streams reader read methods may cause one or more bytes to be read 614 00:40:18,330 --> 00:40:25,740 from the underlying byte input stream to enable the efficient conversion of bytes to characters more 615 00:40:25,740 --> 00:40:26,160 bytes. 616 00:40:26,160 --> 00:40:35,370 Maybe read ahead from the underlying string than are necessary to satisfy the current thread operation 617 00:40:35,880 --> 00:40:37,500 for top efficiency. 618 00:40:37,500 --> 00:40:42,660 Consider wrapping an input stream reader within a buffer the reader as you can see here. 619 00:40:42,780 --> 00:40:50,120 So that's what what we actually done in our code buffer the reader input reader as you can see new Bufford 620 00:40:50,160 --> 00:40:53,530 reader new input stream reader system that in. 621 00:40:53,580 --> 00:40:58,480 So as you can see here in the Android studio you have a buffer entry that object. 622 00:40:58,530 --> 00:41:05,220 And here I created a buffer object and here inside the prentices I created an input stream reader object 623 00:41:05,250 --> 00:41:08,480 OK in order to read those characters. 624 00:41:08,490 --> 00:41:13,830 And here I actually pass this file inputs to an object that I created. 625 00:41:13,830 --> 00:41:23,030 Here are Trudy's constructor of this input stream reader class and here I created a variable of type 626 00:41:23,030 --> 00:41:27,940 strain file data and then I assigned an empty value to this variable. 627 00:41:28,080 --> 00:41:32,000 And here I created another variable called buffer data. 628 00:41:32,280 --> 00:41:35,540 And then again I assigned an empty value to this variable. 629 00:41:35,640 --> 00:41:42,470 And here I created a while loop so void first is going to actually execute this expression here. 630 00:41:42,540 --> 00:41:47,440 White flight data as you can see is going to actually assign buffer the reader that read the line. 631 00:41:47,580 --> 00:41:50,120 OK is going to try to read those data. 632 00:41:50,250 --> 00:41:52,000 One line line line. 633 00:41:52,160 --> 00:41:54,210 And that is going to assign those are they to this. 634 00:41:54,210 --> 00:42:00,320 Why data are key and then is going to check whether those file data is not equal to null. 635 00:42:00,590 --> 00:42:04,090 OK and then is can actually execute this line of code here. 636 00:42:04,100 --> 00:42:09,280 Buffer date of assignment operator buffered data plus file data. 637 00:42:09,530 --> 00:42:17,090 OK so he's going to actually assign these values to these for buffered data and then here I created 638 00:42:17,120 --> 00:42:19,530 a newline character after each line. 639 00:42:19,610 --> 00:42:23,350 OK so it's going to reduce the top line by line and then here. 640 00:42:23,360 --> 00:42:29,340 I just wanted to put a newline character to read those lines of one but one line by line and that is 641 00:42:29,340 --> 00:42:31,810 going to put a newline character after each line. 642 00:42:31,850 --> 00:42:40,120 OK so now here as you can see I have this de-valued that said text buffered data. 643 00:42:40,250 --> 00:42:43,860 So here I just want to assign this value buffer later to the sticks the value. 644 00:42:44,210 --> 00:42:50,920 And then here I need to actually close this buffered leader here. 645 00:42:50,970 --> 00:42:52,180 Discovery that object. 646 00:42:52,250 --> 00:42:56,480 So I just referred to this object Bonfils reader that close. 647 00:42:56,480 --> 00:43:02,750 So this is I'm afraid this is an instance of it that the OP could actually call on this object. 648 00:43:02,790 --> 00:43:09,110 OK and here we have this catch exception here and here is connected if any error occurs while reading 649 00:43:09,110 --> 00:43:12,440 the data from the SD card that is in. 650 00:43:12,670 --> 00:43:20,000 That actually contains this nice file that you XTi then this block of code is going to be executed and 651 00:43:20,000 --> 00:43:25,730 then add a description of the error is going to be actually shown ended up in the Lugg. 652 00:43:25,940 --> 00:43:29,480 And here this toast message is going to be shown to the user. 653 00:43:29,470 --> 00:43:30,720 Exception occurred. 654 00:43:30,740 --> 00:43:31,550 Check log. 655 00:43:31,580 --> 00:43:32,540 For more info. 656 00:43:32,600 --> 00:43:34,150 So hopefully that makes sense. 657 00:43:34,230 --> 00:43:37,120 And now let's actually go back in. 658 00:43:37,190 --> 00:43:39,660 Unclear if it here and here at the end. 659 00:43:39,680 --> 00:43:42,350 Let's actually create another case statement. 660 00:43:42,350 --> 00:43:48,180 So case are that the DOT PTEN save file. 661 00:43:48,260 --> 00:43:56,030 Ok BT and say find colon break and then here I can just call that method. 662 00:43:56,060 --> 00:44:00,770 For example let's save file two documents folder. 663 00:44:00,770 --> 00:44:02,830 I have this method and I have this. 664 00:44:02,900 --> 00:44:06,700 Let's retrieve retrieve file data from documents folder. 665 00:44:06,740 --> 00:44:12,350 So here I just need to call the Smurfit And as you can see here it's now showing us an error. 666 00:44:12,620 --> 00:44:19,400 OK so let's actually hovered over the error area and see what's the error duplicate label. 667 00:44:19,430 --> 00:44:22,290 So here we have our duplicate label. 668 00:44:22,310 --> 00:44:26,800 I mistakenly I refered to this BT and say file here. 669 00:44:26,810 --> 00:44:29,180 I just need to refer to the the name of the between. 670 00:44:29,180 --> 00:44:31,080 Retrieve the info. 671 00:44:31,220 --> 00:44:32,850 OK we have this button. 672 00:44:32,930 --> 00:44:35,450 So let's actually go back to our emulator here. 673 00:44:35,480 --> 00:44:37,960 As you can see retrieve the information from SD card. 674 00:44:37,950 --> 00:44:44,170 So I just needed to refer to the Spartan in OK instead of referring to this button. 675 00:44:44,210 --> 00:44:50,510 So here case are that ID that BT and retrieve the info are that ID data between retrieve the info. 676 00:44:50,780 --> 00:44:52,620 And here we have this method. 677 00:44:52,640 --> 00:44:56,370 Let's retrieve file data from Documents folder break. 678 00:44:56,720 --> 00:44:59,930 So now let's actually run our project and see what happens. 679 00:44:59,930 --> 00:45:04,010 So now as you can see our application is running on this emulator. 680 00:45:04,100 --> 00:45:08,980 So now you want to actually click on this button retrieve the information from SD card. 681 00:45:09,170 --> 00:45:17,510 So now as you can see I actually now see the value that was inside of the TXI the file that that I actually 682 00:45:17,510 --> 00:45:20,440 saved inside my for SD card. 683 00:45:20,450 --> 00:45:29,150 So here I just want to assign another value for example my name OK and then I just disappear this keyboard 684 00:45:29,390 --> 00:45:35,260 and here I just want to click on the spot and save it to documents folder saved and then now I'm on 685 00:45:35,280 --> 00:45:36,840 to click on this button. 686 00:45:36,950 --> 00:45:41,180 Now I can see this value or I can actually type in another value. 687 00:45:41,180 --> 00:45:42,000 Nice. 688 00:45:42,290 --> 00:45:43,610 OK. 689 00:45:43,640 --> 00:45:49,790 And then here I just need to click on the spot and save it to documents folder in SD card and now it's 690 00:45:49,930 --> 00:45:50,880 saved. 691 00:45:51,020 --> 00:45:54,030 And now if I click on the spot in it says Nice. 692 00:45:54,070 --> 00:45:58,400 OK so this is how we can actually read data from the SD card. 693 00:45:58,760 --> 00:46:01,460 And this is how we can actually save data to SD card. 694 00:46:01,510 --> 00:46:04,640 OK so hopefully that makes sense. 695 00:46:04,640 --> 00:46:08,270 And now let's actually add some other functionalities to this application. 696 00:46:08,270 --> 00:46:11,280 Here I just want to add another functionality. 697 00:46:11,360 --> 00:46:17,990 So when the user clicks on this image as you can see here I want to actually save this image in the 698 00:46:17,990 --> 00:46:18,850 SD card. 699 00:46:18,990 --> 00:46:24,680 OK so let's actually go back to our main activity that have a file here and again we need to add another 700 00:46:24,680 --> 00:46:27,540 method for saving an image to SD card. 701 00:46:27,600 --> 00:46:35,060 OK so now in order to save the image in SD card and then see that image in our Android device monitor 702 00:46:35,210 --> 00:46:39,590 here I just want to create another method to do that job for me. 703 00:46:39,800 --> 00:46:44,050 So here I'm going to paste in an effort and then I'm going to explain to you what's going on here. 704 00:46:44,120 --> 00:46:48,740 So as you can see here this is the method that I actually paste that here and as you can see the access 705 00:46:48,740 --> 00:46:50,830 modifier of this method is public. 706 00:46:50,830 --> 00:46:56,700 There is anti-poverty Smurfette is void the name of this method is let's save the image to pictures 707 00:46:56,700 --> 00:46:58,210 folder as you can see. 708 00:46:58,380 --> 00:47:04,750 And now as you can see I created a straightedge exception and here inside a truck try Blatch. 709 00:47:04,890 --> 00:47:06,810 I have a bitmap object. 710 00:47:06,810 --> 00:47:13,380 OK bitmap bitmap bitmap factory that decode rissoles first double for the first argument. 711 00:47:13,510 --> 00:47:16,740 We need to refer to the resources of our application. 712 00:47:16,770 --> 00:47:18,070 So it gives resources. 713 00:47:18,090 --> 00:47:25,000 And the second argument is the name of the image that is inside of the triable folder of our application. 714 00:47:25,140 --> 00:47:28,070 So here I have our triable dot tiger. 715 00:47:28,230 --> 00:47:28,710 OK. 716 00:47:28,860 --> 00:47:34,020 So this image is inside the tribal folder of our project structure. 717 00:47:34,170 --> 00:47:37,830 And here I have an object of type fight. 718 00:47:37,920 --> 00:47:38,560 OK. 719 00:47:39,000 --> 00:47:41,140 So the name of this object is flightpath. 720 00:47:41,400 --> 00:47:44,820 And as you can see the data type of this object is filed. 721 00:47:44,820 --> 00:47:46,650 Assignment operator new. 722 00:47:46,650 --> 00:47:49,760 So here I want to create an object of type file. 723 00:47:49,850 --> 00:47:50,390 OK. 724 00:47:50,580 --> 00:47:51,580 New File. 725 00:47:51,840 --> 00:47:58,020 And for the first argument as you can see here I just want to specify the directory that I want to actually 726 00:47:58,020 --> 00:47:59,250 save the image. 727 00:47:59,250 --> 00:48:03,420 So it environment that gets external storage public directory. 728 00:48:03,540 --> 00:48:06,240 So here it's going to actually give me the access to SD card. 729 00:48:06,510 --> 00:48:13,060 And here inside Apprentice's I need to specify the specific folder specific directory in my SD card 730 00:48:13,170 --> 00:48:15,440 so environment that directory pictures. 731 00:48:15,600 --> 00:48:20,460 So here I want to actually save my image to direct to the pictures. 732 00:48:20,460 --> 00:48:20,910 OK. 733 00:48:20,990 --> 00:48:21,750 Come on. 734 00:48:21,870 --> 00:48:28,390 And here I need to actually specify that the name of the image that you want to actually save. 735 00:48:28,410 --> 00:48:34,420 So here I need to specify the name of that image of this tiger image that you want to say inside that 736 00:48:34,440 --> 00:48:36,990 directory pictures of my SD card. 737 00:48:37,020 --> 00:48:43,920 As you can see Tiger underly image that PMG or I could actually change it to another name for example 738 00:48:43,950 --> 00:48:46,640 Tiger want to free that P and G. 739 00:48:46,670 --> 00:48:53,960 Ok here I specify the name and then it's very important that you actually put the piano here to in order 740 00:48:53,960 --> 00:48:55,530 to specify the format. 741 00:48:55,850 --> 00:49:03,250 And here I created an object of type output stream output stream new file output stream flightpath. 742 00:49:03,480 --> 00:49:08,080 OK so here as you can see let's actually go back to our Android documentation. 743 00:49:08,090 --> 00:49:11,960 In order to see what is this output stream object. 744 00:49:11,960 --> 00:49:19,300 So here I just need to search for output string OK I have this output stream here. 745 00:49:19,640 --> 00:49:20,670 So I just click on it. 746 00:49:20,690 --> 00:49:24,940 And as you can see here public abstract class output stream. 747 00:49:25,050 --> 00:49:26,940 So as you can see this class is abstract. 748 00:49:26,990 --> 00:49:34,780 So if we cannot create an object of a type as it can see of type abstract K.B. cannot create directly 749 00:49:34,780 --> 00:49:36,740 an object from this class. 750 00:49:36,800 --> 00:49:43,760 And as you can see here here it says this abstract class is the superclass of all classes representing 751 00:49:43,850 --> 00:49:51,870 an output stream of bytes an output stream accepts output bytes and send them to some scene. 752 00:49:51,920 --> 00:49:52,320 OK. 753 00:49:52,340 --> 00:49:58,820 Applications that need to define a subclass of output stream must always provide at least a method that 754 00:49:58,820 --> 00:50:00,790 writes one byte of output. 755 00:50:00,890 --> 00:50:04,160 OK so let's go back to our Android studio here. 756 00:50:04,440 --> 00:50:10,290 Here as you can see I created an object here of type output stream as you can see. 757 00:50:10,400 --> 00:50:12,340 So remember this class is an abstract class. 758 00:50:12,380 --> 00:50:16,490 So here we need to actually refer to this flight output stream object. 759 00:50:16,490 --> 00:50:16,730 OK. 760 00:50:16,760 --> 00:50:19,100 Which is actually a subclass of output stream. 761 00:50:19,100 --> 00:50:25,590 So let's go back to what Andrew documentation and says For find out food stream. 762 00:50:25,820 --> 00:50:29,920 As you can see here I have this class here. 763 00:50:30,040 --> 00:50:36,650 And as you can see file output stream actually directly inherits from this output stream class. 764 00:50:36,700 --> 00:50:42,700 So here because this class is an abstract class and we cannot create an object of type with stream directly 765 00:50:43,050 --> 00:50:46,440 here I created an object of type flight output stream. 766 00:50:46,630 --> 00:50:52,150 And then I pass this final path to this class constructor flightpath. 767 00:50:52,150 --> 00:50:52,940 OK. 768 00:50:53,320 --> 00:50:57,460 And then here if there is a bitmap object that compress. 769 00:50:57,520 --> 00:51:01,830 So remember we have a method called compress for bitmap objects. 770 00:51:01,990 --> 00:51:07,230 First of all we need to specify our format of our image that we want to save. 771 00:51:07,240 --> 00:51:09,880 Bitmap does compress formats that P and G. 772 00:51:09,880 --> 00:51:13,150 Here we want to actually compress our image and save it. 773 00:51:13,260 --> 00:51:14,130 Yes the cart. 774 00:51:14,140 --> 00:51:15,510 So we need to call this method. 775 00:51:15,670 --> 00:51:17,760 So the format of our image is PNB. 776 00:51:17,890 --> 00:51:24,940 OK we could actually use other methods for example JPT or Tepic or other formats. 777 00:51:24,940 --> 00:51:26,640 I choose and G. 778 00:51:26,950 --> 00:51:29,640 And here we need to specify the quality of our image. 779 00:51:29,650 --> 00:51:31,320 So 100 is good. 780 00:51:31,660 --> 00:51:37,510 And here we need to pass the output stream object output stream in order to save that image to file 781 00:51:37,510 --> 00:51:37,800 path. 782 00:51:37,810 --> 00:51:38,580 OK. 783 00:51:39,070 --> 00:51:44,300 And then we need to call this my method output stream that flash and out of the stream that close. 784 00:51:44,490 --> 00:51:44,780 OK. 785 00:51:44,790 --> 00:51:47,950 And then here we need to show our message to the user. 786 00:51:48,010 --> 00:51:53,760 Your image has been successfully saved so let's actually go back to what Android documentation here. 787 00:51:53,770 --> 00:51:58,020 In order to search for Flash Smurfette flush. 788 00:51:58,520 --> 00:52:04,630 And here we can actually see that Meffert if you search for it let's actually go back to what our output 789 00:52:04,630 --> 00:52:14,280 stream class in order to see the methods that are actually related to output stream. 790 00:52:14,290 --> 00:52:21,130 So here as you can see we have the psalmody flush as you can see this Meffert flushes this output stream 791 00:52:21,370 --> 00:52:25,290 and forces any buffered output bytes to be written out. 792 00:52:25,360 --> 00:52:25,980 OK. 793 00:52:26,080 --> 00:52:32,080 And we have a close MF'er closes this output stream and really says any system resources associated 794 00:52:32,470 --> 00:52:33,510 with this stream. 795 00:52:33,730 --> 00:52:40,210 OK so we needed to actually call this flush in order to actually it says that it flushes this output 796 00:52:40,210 --> 00:52:45,570 stream and forces any buffered output bytes to be written out. 797 00:52:45,610 --> 00:52:46,280 OK. 798 00:52:46,750 --> 00:52:53,230 And here as you can see I just wanted to show a message to the user and we have a catch block here. 799 00:52:53,380 --> 00:53:01,900 So if the program actually runs into error and if the program cannot actually save this image into SD 800 00:53:01,900 --> 00:53:10,560 card into the collector the pictures then an error may occur and we can actually catch that error inside 801 00:53:10,570 --> 00:53:11,130 this block. 802 00:53:11,140 --> 00:53:17,900 And this is going to show me a description of that error and then put that error inside the lock. 803 00:53:18,070 --> 00:53:22,760 And then it's going to show us and a tossed object exception occurred. 804 00:53:22,840 --> 00:53:24,660 Check look for more info. 805 00:53:24,970 --> 00:53:26,260 So let's actually go back to. 806 00:53:26,450 --> 00:53:32,370 Inside these enclaves Mefford And here let's actually create another case statement here. 807 00:53:32,410 --> 00:53:38,290 So case our thoughts ID dot BT G. 808 00:53:38,420 --> 00:53:44,290 And so if the user clicks on that image ok for example this image as you can see here we have this image. 809 00:53:44,410 --> 00:53:50,980 If the user clicks on this image then and when I do something break here and then here I just need to 810 00:53:51,310 --> 00:53:56,590 call that and if it lets us save the image to pictures folder OK. 811 00:53:56,740 --> 00:53:59,740 So let's actually run our project here and see what happens. 812 00:53:59,740 --> 00:54:04,620 So as you can see here now our application is actually running on this emulator. 813 00:54:04,660 --> 00:54:10,750 Let me actually make this keyboard disappear and now I want to actually click on this image here. 814 00:54:10,780 --> 00:54:11,050 OK. 815 00:54:11,050 --> 00:54:13,950 In order to save this image in the SD card. 816 00:54:14,140 --> 00:54:19,130 So let's actually click on it and now it says your image has been successfully saved. 817 00:54:19,180 --> 00:54:23,220 So let's actually open our Android device monitor as you can see here. 818 00:54:23,230 --> 00:54:29,610 This is my Android device monitor inside these stories folder inside this emulated zero here. 819 00:54:29,620 --> 00:54:32,220 As you can see I have these directories. 820 00:54:32,260 --> 00:54:36,640 So let's actually search for the pictures directory as you can see here. 821 00:54:36,730 --> 00:54:38,620 And inside these pictures directory. 822 00:54:38,620 --> 00:54:42,020 I have this image Tiger I want to free that PMG. 823 00:54:42,070 --> 00:54:46,750 So we managed to successfully save an image into SD card. 824 00:54:47,110 --> 00:54:48,930 So hopefully that makes sense. 825 00:54:48,940 --> 00:54:54,000 So let's actually go back to our Android studio and here I want to actually add some more functionalities 826 00:54:54,400 --> 00:54:56,490 to our application here. 827 00:54:56,500 --> 00:55:02,830 I just want to allow the user to actually click on the spot and allow access pictures in SD card. 828 00:55:02,860 --> 00:55:06,280 So I want to actually add some pictures to my 3D SD card. 829 00:55:06,280 --> 00:55:16,900 And then by just clicking on this button I want to let the user to see the images that we actually retrieve 830 00:55:16,900 --> 00:55:25,240 from the SD card and put it inside on our inside the image switcher and sure the use user those images. 831 00:55:25,240 --> 00:55:30,550 So in order to do that job we need to create another team effort let's actually scroll to the top of 832 00:55:30,580 --> 00:55:37,570 our Java file here and here I want to actually declare two variables here. 833 00:55:37,630 --> 00:55:42,980 So here I want to create an add a list of strange values. 834 00:55:43,090 --> 00:55:46,060 So I just need to type in a list here. 835 00:55:46,390 --> 00:55:52,510 And inside these angle brackets I need to specify the type of objects that I want to assign to this 836 00:55:52,510 --> 00:55:53,010 area. 837 00:55:53,050 --> 00:55:53,680 OK. 838 00:55:53,680 --> 00:56:00,820 So at least as strange and the name of this array is going to be file path names. 839 00:56:01,180 --> 00:56:04,680 OK so this is this array is going to hold. 840 00:56:05,080 --> 00:56:07,830 Actually the names of the file paths OK. 841 00:56:08,200 --> 00:56:11,880 And here I want to create another array of type find. 842 00:56:12,110 --> 00:56:14,310 OK so find files. 843 00:56:14,380 --> 00:56:17,570 So I just need to put a semicolon at the end of my statement. 844 00:56:17,680 --> 00:56:20,880 So here I actually declared two objects. 845 00:56:20,920 --> 00:56:25,540 OK the first one is an array list object of types three file pathnames. 846 00:56:25,540 --> 00:56:29,120 And the second one is an array of file objects. 847 00:56:29,140 --> 00:56:29,730 OK. 848 00:56:29,920 --> 00:56:33,470 So let's actually go back inside this on create Smurfette. 849 00:56:33,670 --> 00:56:41,500 And now I want to actually be fair to the name of this button BT and allow access Beecher's pattern 850 00:56:41,740 --> 00:56:42,390 here. 851 00:56:42,700 --> 00:56:47,870 So here I just need to type in PTEN allow access pictures. 852 00:56:47,900 --> 00:56:51,310 That's set unclick listener. 853 00:56:51,520 --> 00:56:54,570 So here I want to use an anonymous inner class. 854 00:56:54,780 --> 00:56:55,240 OK. 855 00:56:55,480 --> 00:57:01,010 So we allow access pictures that certainly isn't a new view. 856 00:57:01,180 --> 00:57:03,640 So here as you can see I just need to choose this option. 857 00:57:03,640 --> 00:57:04,670 Unclick listener. 858 00:57:04,810 --> 00:57:10,060 And then it's going to create an anonymous class for me and that anonymous class is going to actually 859 00:57:10,360 --> 00:57:16,810 implement this view that an uncle listener interface and then it's going to override this uncle uncle 860 00:57:16,900 --> 00:57:17,760 my first for me. 861 00:57:17,800 --> 00:57:21,530 OK so now I am inside an anonymous inner class. 862 00:57:21,760 --> 00:57:22,120 OK. 863 00:57:22,120 --> 00:57:27,470 And here inside that class inside that anonymous class I have this unclick method. 864 00:57:27,610 --> 00:57:29,670 So now I can put my Ancoats here.