1 00:00:00,180 --> 00:00:07,170 So now in order to create a class in our project first I need to click on find Neal and then click on 2 00:00:07,170 --> 00:00:08,430 Java class. 3 00:00:08,430 --> 00:00:10,890 So now for the name of our class just type in here. 4 00:00:10,890 --> 00:00:15,810 SD card checker Okay. 5 00:00:16,170 --> 00:00:17,900 And then click on OK. 6 00:00:18,070 --> 00:00:20,640 So as you can see here this is our SD card check here. 7 00:00:20,690 --> 00:00:21,680 Our class. 8 00:00:21,690 --> 00:00:22,230 OK. 9 00:00:22,290 --> 00:00:23,230 So in this class. 10 00:00:23,280 --> 00:00:28,540 In this class I just want to actually to check whether we can actually write or read from the SD card. 11 00:00:28,620 --> 00:00:34,020 Ok now I'm going to actually paste in some lines of code here and then I'm going to explain to you what's 12 00:00:34,020 --> 00:00:34,940 going on here. 13 00:00:35,040 --> 00:00:39,140 So as you can see here these are the lines of code that they actually pasted here. 14 00:00:39,210 --> 00:00:39,730 OK. 15 00:00:39,860 --> 00:00:42,460 Or if I pasted this method here as you can see. 16 00:00:42,660 --> 00:00:47,670 So first of all let me explain to you that the access modifier of the Smurfit that they actually pasted 17 00:00:47,670 --> 00:00:49,560 here is public. 18 00:00:50,010 --> 00:00:52,400 And as you can see here this method is static. 19 00:00:52,400 --> 00:00:56,100 So we can actually refer to this method by using the name of this class. 20 00:00:56,200 --> 00:00:59,200 As the card check here that the name of the Smurfette. 21 00:00:59,200 --> 00:00:59,920 OK. 22 00:01:00,270 --> 00:01:04,340 And as you can see here the return type of this method is void. 23 00:01:04,500 --> 00:01:08,480 Check whether external storage available or not. 24 00:01:08,550 --> 00:01:11,020 OK so this is the name of this Mefford. 25 00:01:11,190 --> 00:01:11,810 OK. 26 00:01:12,090 --> 00:01:19,280 And this pivot actually accepts a context as you can see here the argument of this if it is context. 27 00:01:19,530 --> 00:01:24,610 And now inside this method I have two variables of type Boolean. 28 00:01:24,630 --> 00:01:28,680 The first one is is external storage available. 29 00:01:28,860 --> 00:01:33,800 And as you can see here I assigned the value of false to this variable OK. 30 00:01:34,020 --> 00:01:38,650 And the second one as you can see here is is external storage writable. 31 00:01:38,820 --> 00:01:44,040 And as you can see here the default value that I assigned to the symmetry about is false. 32 00:01:44,040 --> 00:01:50,370 So here as you can see I created another value but of type is strange and the name of this variable 33 00:01:50,370 --> 00:01:51,410 is state. 34 00:01:51,750 --> 00:01:58,430 And as you can see here I assigned this value to the Suadi environment that get external storage state. 35 00:01:58,470 --> 00:02:03,870 So it's going actually to check for that we can actually write or actually read from the SD card or 36 00:02:03,870 --> 00:02:04,420 not. 37 00:02:04,520 --> 00:02:04,980 OK. 38 00:02:05,100 --> 00:02:07,500 Environment that get external storage. 39 00:02:07,590 --> 00:02:14,340 So that value is going to be actually assigned to this state rowdier But and here I create it. 40 00:02:14,340 --> 00:02:22,410 And if else statement as you can see here if environment that media mounted that equals state. 41 00:02:22,680 --> 00:02:28,990 So this means that whether we can actually read and write the media on the SD card or not. 42 00:02:29,120 --> 00:02:29,700 OK. 43 00:02:29,740 --> 00:02:34,080 Environment that media mounted that equals state vision. 44 00:02:34,110 --> 00:02:40,140 What we can read and write the media also if this expression evaluates to true then we can actually 45 00:02:40,200 --> 00:02:46,130 read and write the media on the SD card and then as you can see here is external storage available. 46 00:02:46,170 --> 00:02:51,550 This value is variable assignment operator is external storage writable. 47 00:02:51,630 --> 00:02:53,700 This variable assignment operator. 48 00:02:53,700 --> 00:02:54,220 True. 49 00:02:54,420 --> 00:03:00,490 So I assign the value true to both of these variables to two both of these boolean variables. 50 00:03:00,690 --> 00:03:03,030 So we could actually write our code in this way. 51 00:03:03,060 --> 00:03:03,430 OK. 52 00:03:03,450 --> 00:03:05,220 Is external storage available. 53 00:03:05,220 --> 00:03:10,220 Assignment operator is external storage writable assignment operator. 54 00:03:10,220 --> 00:03:11,140 True. 55 00:03:11,940 --> 00:03:18,480 And here I created a toast in order to show the user that we can actually read and write from the SD 56 00:03:18,480 --> 00:03:18,830 card. 57 00:03:18,900 --> 00:03:25,230 As you can see here toast that make text first of all I actually put the context as you can see that 58 00:03:25,230 --> 00:03:29,220 we actually receive as an argument from the Smurfit context. 59 00:03:29,280 --> 00:03:33,870 The second one is the actually the message that I want to show to the user. 60 00:03:33,900 --> 00:03:39,740 Read and write and the first one is the length of the actually the message that you want to show to 61 00:03:39,740 --> 00:03:42,700 the use that the duration of the message that they want to show to the user. 62 00:03:42,990 --> 00:03:49,920 And I called this first show on these talks object and I have an ELSE IF statement. 63 00:03:50,010 --> 00:03:54,900 So if this expression evaluates to false then this expression is going to be evaluated. 64 00:03:54,900 --> 00:03:56,260 ELSE IF. 65 00:03:56,310 --> 00:04:01,630 ELSE IF environment that Medio mounted read only that equals state. 66 00:04:01,830 --> 00:04:05,710 So in this way we can all we can only read the media from the SD card. 67 00:04:05,730 --> 00:04:06,710 OK. 68 00:04:06,780 --> 00:04:13,710 If this expression evaluates to true then we can only treat the media and then assign a value to. 69 00:04:13,710 --> 00:04:16,450 This is this is external storage available. 70 00:04:16,460 --> 00:04:17,130 True. 71 00:04:17,640 --> 00:04:23,270 And I assigned the value files is external storage rightabout false as you can see here. 72 00:04:23,460 --> 00:04:26,780 And then I created a host object host that make text. 73 00:04:26,790 --> 00:04:33,520 First of all it is actually a scientist context for the first argument of this to make text Merfeld. 74 00:04:33,720 --> 00:04:39,540 And you can see here we receive this context as an argument of the Smurfette and then the second one 75 00:04:39,540 --> 00:04:44,760 is the message and the first one is the duration of the message that I want to show to the user. 76 00:04:44,850 --> 00:04:48,500 And I called this show my friend and this object tossed object. 77 00:04:48,930 --> 00:04:51,430 And we have an else statements here. 78 00:04:51,570 --> 00:04:58,500 So if both of these expressions evaluates to false then this expression and say This statement is going 79 00:04:58,500 --> 00:05:02,470 to be executed and neither read nor write. 80 00:05:02,490 --> 00:05:05,730 And the SD card is external storage available. 81 00:05:05,850 --> 00:05:11,370 Assignment operator is external storage writable assignment operator false. 82 00:05:11,370 --> 00:05:18,010 So I assigned the value false to both of these a boolean value else here as you can see here and that 83 00:05:18,010 --> 00:05:24,570 I created a toast object in order to show to the user that we can neither read nor write on the SD card. 84 00:05:24,640 --> 00:05:25,070 OK. 85 00:05:25,120 --> 00:05:27,130 So hopefully that makes sense. 86 00:05:27,610 --> 00:05:31,790 And now let's actually go back inside our our main activity the java file here. 87 00:05:31,840 --> 00:05:37,210 So inside our main activity file as you can see now you can actually call the Smurfit. 88 00:05:37,420 --> 00:05:44,680 So first of all because this is actually a static method we can actually we can actually choose to refer 89 00:05:44,920 --> 00:05:50,500 to the name of this class and then I put a dot operator and then I can actually refer to the name of 90 00:05:50,500 --> 00:05:51,220 the Smurfit. 91 00:05:51,370 --> 00:05:54,720 So here I am just typing an SD card Take care. 92 00:05:54,940 --> 00:06:01,830 So I referred to the name of this class that I created inside our project that SD card check hair that 93 00:06:03,660 --> 00:06:06,770 check whether external storage available or not. 94 00:06:07,020 --> 00:06:12,880 And now we can actually assign the value of value of type context. 95 00:06:12,920 --> 00:06:18,080 So context is this our class main activity that this. 96 00:06:18,210 --> 00:06:21,530 And now let's actually run our project and see what happens. 97 00:06:21,530 --> 00:06:24,780 So now as you can see it says lead and right. 98 00:06:24,880 --> 00:06:25,340 OK. 99 00:06:25,430 --> 00:06:28,990 So if we can actually read and write on the SD card. 100 00:06:29,090 --> 00:06:29,600 OK. 101 00:06:29,600 --> 00:06:31,690 So hopefully that makes sense. 102 00:06:31,730 --> 00:06:34,790 And now it's actually putting some more lines of code inside. 103 00:06:34,820 --> 00:06:36,420 Our main activity class. 104 00:06:36,440 --> 00:06:42,170 So now I'm going to actually pasting some lines of code here inside this main activity class and then 105 00:06:42,170 --> 00:06:44,010 I'm going to explain to you what's going on here. 106 00:06:44,150 --> 00:06:50,220 Here I'm going to actually declare some user interface components inside the main activity class. 107 00:06:50,270 --> 00:06:55,550 So as you can see here these are the lines of code that they actually pasted inside this main activity 108 00:06:55,550 --> 00:06:56,300 class. 109 00:06:56,300 --> 00:07:01,570 So first of all I actually created a button as you can see here between downloads folder. 110 00:07:01,670 --> 00:07:05,290 So as you can see I'm just declaring this button here. 111 00:07:05,300 --> 00:07:07,240 I'm not instantiating this project. 112 00:07:07,310 --> 00:07:08,800 Disputant OK. 113 00:07:08,980 --> 00:07:10,840 I'm just declaring this button. 114 00:07:11,210 --> 00:07:18,070 And here I actually declared and added a button between the music folder between documents folder between 115 00:07:18,080 --> 00:07:23,760 ringtones folder BATNA podcasts folders as you can see here we have these buttons here. 116 00:07:23,840 --> 00:07:25,090 OK. 117 00:07:25,190 --> 00:07:31,490 Download their music file their documents folder ringtones ringtones folder and so on. 118 00:07:31,880 --> 00:07:38,870 And as he has said he had Pythian about a test folder between the movies folder PTEN alarm's folder 119 00:07:39,200 --> 00:07:41,800 PTEN Pictures folder as you can see. 120 00:07:41,990 --> 00:07:44,460 And I have between pretty safe file. 121 00:07:44,660 --> 00:07:46,470 EDT value added text. 122 00:07:46,470 --> 00:07:50,700 So as you can see here I declared an edit text object here. 123 00:07:51,070 --> 00:07:58,670 And I have another button here between the retrieve info and I have a text view takes the value here 124 00:07:58,700 --> 00:08:05,450 I declared and image view and him on and here as you can see I declared and added a button between allow 125 00:08:05,450 --> 00:08:12,690 access pictures and as you can see here I declared and are linearly layouts here as you can see linearly 126 00:08:12,690 --> 00:08:17,330 out linearly and horizontal image through each image suture. 127 00:08:17,330 --> 00:08:22,700 So now let's actually instantiate these objects that they actually declared inside this main activity 128 00:08:22,700 --> 00:08:23,230 class. 129 00:08:23,390 --> 00:08:29,140 So inside this uncreate Smurfette after this line of code I'm going to instantiate those objects. 130 00:08:29,270 --> 00:08:35,060 So now here I went actually pasting some lines of code inside this uncreate method. 131 00:08:35,240 --> 00:08:37,700 And then I'm going to explain to you what's going on here. 132 00:08:37,700 --> 00:08:42,480 So as you can see here these are the lines of code that I actually pasted here inside this uncreate 133 00:08:42,520 --> 00:08:43,110 method. 134 00:08:43,190 --> 00:08:49,000 And as you can see here I am actually instantiating the objects that I actually declared inside the 135 00:08:49,070 --> 00:08:54,030 main activity class so that they can see BTA and download folder as you can see here. 136 00:08:54,260 --> 00:08:56,490 And it says between download directory. 137 00:08:56,630 --> 00:09:02,270 OK so because we want to actually create directories inside our For example downloads folder we can 138 00:09:02,270 --> 00:09:07,330 either call it download folder between downloads folder or download our directory. 139 00:09:07,340 --> 00:09:07,950 OK. 140 00:09:08,210 --> 00:09:09,190 It doesn't make any difference. 141 00:09:09,200 --> 00:09:15,980 But here I just wanted to show you that you can actually create a folder in site up for example and 142 00:09:15,980 --> 00:09:18,430 other directed in music for example for that. 143 00:09:18,440 --> 00:09:19,280 OK. 144 00:09:19,340 --> 00:09:25,850 So you can call it music directory or music folder or download directory or download folder and here 145 00:09:25,870 --> 00:09:32,510 as you can see I have Pythian music folder between music directory and here between documents folder 146 00:09:32,980 --> 00:09:39,440 and here as you can see between documents folder between our ringtones folder B.T. and process folder 147 00:09:39,590 --> 00:09:46,940 between movies folder and alarm's folder Pythian pictures folder pity and save file as you can see it 148 00:09:46,940 --> 00:09:55,280 is this the button is for this button as you can see we have a safe button here for actually saving 149 00:09:55,280 --> 00:10:01,590 some data to a file inside our documents folder as you can see here between savefile. 150 00:10:01,910 --> 00:10:07,390 And we have another button for retrieving those data inside another file in SD card. 151 00:10:07,520 --> 00:10:10,510 And this is the ID for that BT and retrieve the info. 152 00:10:10,760 --> 00:10:16,430 And if I go back and say this main activity that java file here we have this PTEN retrieve info as you 153 00:10:16,430 --> 00:10:23,270 can see here between retrieve the info and I have EDT value this is for getting text. 154 00:10:23,270 --> 00:10:26,590 This is for actually receiving Teske text from the user. 155 00:10:26,600 --> 00:10:32,770 And then put that text inside another file in SD card which claim I'm going to show you in a minute 156 00:10:33,020 --> 00:10:40,970 and you have TXI the value for actually getting those actually those inputs when the user actually put 157 00:10:40,970 --> 00:10:42,780 some text inside the editor. 158 00:10:42,830 --> 00:10:45,810 And then we build we want to actually retrieve those information. 159 00:10:45,830 --> 00:10:49,970 So if you want to put more information inside these TXI the value takes you. 160 00:10:50,270 --> 00:10:53,530 And we have EMG anemone as you can see here. 161 00:10:53,780 --> 00:10:59,090 We have BT and allow access pictures here we want to actually access the pictures inside the SD card 162 00:10:59,360 --> 00:11:03,130 and then don't look at those pictures inside these image switcher. 163 00:11:03,200 --> 00:11:10,640 So that's why I actually created these objects linearly out horizontally so linearly or horizontal is 164 00:11:10,640 --> 00:11:14,640 actually inside and they're actually horizontal scroll view. 165 00:11:14,660 --> 00:11:15,170 OK. 166 00:11:15,350 --> 00:11:20,430 And I have this image switcher for showing for showing the images then they use it or clicking on those 167 00:11:20,520 --> 00:11:23,110 images inside the city nearly what is on top. 168 00:11:23,280 --> 00:11:27,960 So now I'm going actually putting some more lines of code here and then I'm going explain to you what's 169 00:11:27,960 --> 00:11:28,890 going on here. 170 00:11:28,890 --> 00:11:33,310 So as you can see here these are the lines of code that I actually pasted here. 171 00:11:33,540 --> 00:11:39,030 And as you can see I am actually making these buttons that are inside these linearly and vertical these 172 00:11:39,030 --> 00:11:39,960 buttons for example. 173 00:11:39,970 --> 00:11:41,610 These Downloads folder. 174 00:11:41,730 --> 00:11:43,000 This immunity for the. 175 00:11:43,140 --> 00:11:44,170 And other buttons. 176 00:11:44,190 --> 00:11:46,710 A listener to the clicks of the user. 177 00:11:46,710 --> 00:11:47,190 OK. 178 00:11:47,250 --> 00:11:52,140 So for example between downloads for that certain click listener and here we need to actually passing 179 00:11:52,140 --> 00:11:53,280 the context. 180 00:11:53,320 --> 00:11:59,700 So main activity that this BTA and music for that certain click us and our main activity that is I have 181 00:11:59,700 --> 00:12:06,140 these PTEN documents folders that are set and click and listener main activity that this PTEN ringtones 182 00:12:06,140 --> 00:12:09,390 for their thoughts Stankovic listener main activity that this. 183 00:12:09,540 --> 00:12:16,860 And we have these bits and podcasts folder between movies folder PTEN alarms folder PTEN pictures folder 184 00:12:16,970 --> 00:12:20,150 BTA and save five PTEN retrieve info. 185 00:12:20,400 --> 00:12:24,010 And I enjoy that so then click listen and an activity that does this. 186 00:12:24,210 --> 00:12:29,460 But here we need to actually implement this article class and an interface for these buttons. 187 00:12:29,580 --> 00:12:38,520 So here after this act of compact activity here I just need to type in implements of view dot unclick 188 00:12:39,570 --> 00:12:43,110 listener so I have this view that actually exist in an interface. 189 00:12:43,140 --> 00:12:50,180 And here I just need to press Enter key on my keyboard and now I am actually implementing this Archilochus 190 00:12:50,180 --> 00:12:51,170 in our interface. 191 00:12:51,270 --> 00:12:57,540 And if I hover over this error area it says class main activity must either be declared abstract or 192 00:12:57,600 --> 00:13:04,650 implement abstract Smurfette unclick viewed as you can see we have our own view of you as an argument 193 00:13:04,680 --> 00:13:07,320 of this uncle Mefford in uncock listener. 194 00:13:07,500 --> 00:13:13,410 OK so Uncle Eagleson an uncle listener is actually an interface that we need to actually implement the 195 00:13:13,410 --> 00:13:18,720 abstract Mefford unclick you uncle if you insight this interface. 196 00:13:18,840 --> 00:13:26,250 So here after the Indian curly brace of the is uncreate Mefford here I can't just type in uncreate on 197 00:13:26,490 --> 00:13:27,250 click. 198 00:13:27,300 --> 00:13:35,100 I can just for example delete this method here and here again just insight is our main activity class. 199 00:13:35,100 --> 00:13:40,500 And after the Hadian curly brace of this uncreate method I can just throw eclectically here and then 200 00:13:40,720 --> 00:13:42,420 click can generate. 201 00:13:42,870 --> 00:13:49,320 And then here click can implement Moffats and here as you can see I have this android dot view to view 202 00:13:49,320 --> 00:13:52,040 that unclick listener interface as you can see here. 203 00:13:52,260 --> 00:13:55,860 And inside that interface here we need to actually implement this method. 204 00:13:55,890 --> 00:14:01,120 So here I just need to click on OK and now it's going to implement that Mefford for me. 205 00:14:01,170 --> 00:14:01,810 OK. 206 00:14:02,100 --> 00:14:07,860 And then here again just putting my own quotes that would be related to these buttons. 207 00:14:07,860 --> 00:14:16,350 So now as you may know in Android because we want to actually access the SD card and read or write for 208 00:14:16,350 --> 00:14:25,180 example some data on the SD card we need to actually first of all specify that we need to access the 209 00:14:25,200 --> 00:14:28,190 SD SD card in Android manifest. 210 00:14:28,230 --> 00:14:34,350 So after the Indian attack of this application tag as you can see here inside the manifest tank here 211 00:14:34,380 --> 00:14:37,860 I need to actually specify that or you want to access the SD card. 212 00:14:37,920 --> 00:14:45,330 So I just need to open a task here and then here I can just type in users permission and inside these 213 00:14:45,330 --> 00:14:45,990 double codes. 214 00:14:46,020 --> 00:14:48,000 I need to actually specify that what kind. 215 00:14:48,000 --> 00:14:50,230 What kind of features in Android. 216 00:14:50,240 --> 00:14:51,590 I meant to access. 217 00:14:51,630 --> 00:14:56,800 So here I want to actually read and write some data from the SD card. 218 00:14:56,850 --> 00:14:57,360 OK. 219 00:14:57,600 --> 00:15:05,030 So first for software for the first permission here I'm going to just type in read as you can see hear 220 00:15:05,540 --> 00:15:10,890 read and here is going to get you to show me some recommendations. 221 00:15:11,000 --> 00:15:15,440 And here I can choose read external storage as you can see here. 222 00:15:15,440 --> 00:15:22,250 Now here I can just close this tag here and here we need to actually use another repair mission. 223 00:15:22,280 --> 00:15:24,330 So here I just need to open this tag. 224 00:15:24,390 --> 00:15:26,590 Uses permission here. 225 00:15:26,600 --> 00:15:29,640 I want to actually specify that I want to write an SD card. 226 00:15:29,660 --> 00:15:30,160 OK. 227 00:15:30,230 --> 00:15:35,180 So here I can just type in right and here it's going to actually give me some options as you can see 228 00:15:35,180 --> 00:15:35,850 here. 229 00:15:35,960 --> 00:15:36,410 Right. 230 00:15:36,410 --> 00:15:37,090 Store right. 231 00:15:37,100 --> 00:15:38,490 External storage. 232 00:15:38,510 --> 00:15:39,710 So choose this option. 233 00:15:39,740 --> 00:15:42,010 And then a person entered key on your keyboard. 234 00:15:42,020 --> 00:15:47,860 So now I need to actually close the stack and now as you can see we can actually access the SD card 235 00:15:48,220 --> 00:15:54,200 but not yet here inside this main activity that a file we need to actually put in some lines of code 236 00:15:54,560 --> 00:16:02,180 regarding that we want to actually access the SD card and we need to actually get the user permission 237 00:16:02,570 --> 00:16:03,250 for that. 238 00:16:03,350 --> 00:16:03,810 OK. 239 00:16:03,950 --> 00:16:06,510 So here we actually are putting some more lines of code. 240 00:16:06,530 --> 00:16:10,280 And then I'm going to explain to you what's going on here. 241 00:16:10,340 --> 00:16:13,820 So here first of all we need a constant. 242 00:16:13,940 --> 00:16:18,480 For example our request called for actually using a permission in Android. 243 00:16:18,620 --> 00:16:23,390 So here I'm going to paste this constant here public as you can see this is the constants that they 244 00:16:23,390 --> 00:16:24,600 actually pasted here. 245 00:16:24,740 --> 00:16:26,300 Public static. 246 00:16:26,300 --> 00:16:28,060 So this constant is a static. 247 00:16:28,100 --> 00:16:28,640 OK. 248 00:16:28,850 --> 00:16:30,060 Final. 249 00:16:30,200 --> 00:16:32,040 And as you can see this is constant. 250 00:16:32,060 --> 00:16:34,450 It requires the code one to free forth. 251 00:16:34,580 --> 00:16:37,610 OK so this is my request code for using the permission. 252 00:16:37,610 --> 00:16:42,830 It doesn't make any difference what kind of numbers you use but I chose to use this one to free for 253 00:16:42,860 --> 00:16:43,260 number. 254 00:16:43,310 --> 00:16:44,070 OK. 255 00:16:44,330 --> 00:16:48,520 And now I'm going to paste in some of it and then I'm going to explain to you what's going on here. 256 00:16:48,530 --> 00:16:54,110 So as you can see here this is the method that they actually pasted inside these main activity class. 257 00:16:54,110 --> 00:16:54,640 OK. 258 00:16:54,860 --> 00:17:01,070 So the access modifier of this method is publish the return type of this method is boolean and the name 259 00:17:01,070 --> 00:17:04,370 of this method is is stored as permission granted. 260 00:17:04,790 --> 00:17:12,750 And here as you can see inside the body of the Smurfit I created an if statement so in Android in STK 261 00:17:12,770 --> 00:17:18,560 version at when a free and above we need to actually specify that what kinds of permission we want to 262 00:17:18,560 --> 00:17:25,020 use in Android and we need to actually get to get the permission of the user for using those features. 263 00:17:25,070 --> 00:17:33,040 OK but before the SDK to be freed up we just needed to specify that that those permissions in Android 264 00:17:33,050 --> 00:17:40,060 manifest but in SDK to any free and pop we need to specify it was permissions in in our Java codes too. 265 00:17:40,100 --> 00:17:47,120 So that's why I created an if statement build that version is the it is greater than or equal to number 266 00:17:47,120 --> 00:17:47,890 23. 267 00:17:47,900 --> 00:17:55,430 Here I am specifying that if the STK version is 20 free or greater than 23 and here I created another 268 00:17:55,440 --> 00:17:56,900 if statement if. 269 00:17:56,900 --> 00:17:58,010 Check self permission. 270 00:17:58,010 --> 00:18:00,730 So this is another method builtin in Android. 271 00:18:00,770 --> 00:18:07,940 OK if takes self permission and that manifested permission right external storage. 272 00:18:08,020 --> 00:18:08,690 OK. 273 00:18:08,780 --> 00:18:11,820 Is equal to package manager that permission granted. 274 00:18:11,990 --> 00:18:19,070 Ok so because you want to actually write and or read from the SD card if you actually have the permission 275 00:18:19,340 --> 00:18:24,530 to write an external storage if you have the permission to read from the external external storage too. 276 00:18:24,640 --> 00:18:25,190 OK. 277 00:18:25,550 --> 00:18:31,460 So if checks have permission and troit that manifested permission write X then storage is equal to package 278 00:18:31,460 --> 00:18:34,460 manager package manager that permission granted. 279 00:18:34,550 --> 00:18:39,770 So if we have the permission to access the the external storage. 280 00:18:39,800 --> 00:18:41,880 OK here I created a plug. 281 00:18:41,990 --> 00:18:43,810 OK LUGG permission is granted. 282 00:18:43,880 --> 00:18:44,790 Return true. 283 00:18:44,990 --> 00:18:51,770 So if it is going to actually return TRUE else else as you can see I have an else statement here else 284 00:18:51,780 --> 00:18:53,380 permission is revoked. 285 00:18:53,450 --> 00:18:59,230 OK so we don't have the permission to actually access the external storage. 286 00:18:59,240 --> 00:19:05,270 So here I just referred to this activity computer class we have this activity that the class as you 287 00:19:05,270 --> 00:19:08,320 can see that request permissions. 288 00:19:08,330 --> 00:19:11,660 So here we want to actually request the permissions in Android. 289 00:19:11,730 --> 00:19:13,850 So this this is the context. 290 00:19:13,850 --> 00:19:17,630 And here I have an object new string. 291 00:19:17,660 --> 00:19:21,670 So if you have an object of actually an array of string objects. 292 00:19:21,680 --> 00:19:22,160 OK. 293 00:19:22,190 --> 00:19:28,940 And inside these are actually curly braces we need to specify what kind of actually the what kind of 294 00:19:28,940 --> 00:19:31,120 permissions we want to use. 295 00:19:31,190 --> 00:19:33,450 Ok manifest that permission right. 296 00:19:33,470 --> 00:19:34,970 External storage. 297 00:19:35,420 --> 00:19:38,870 And here we need to actually use or request code. 298 00:19:38,960 --> 00:19:44,770 So here use this number one as you can see here and then I return false. 299 00:19:44,780 --> 00:19:51,570 So this method is going to actually return false if we don't have any permission to access this. 300 00:19:51,650 --> 00:19:53,990 For example Raghda external storage. 301 00:19:54,020 --> 00:19:54,480 OK. 302 00:19:54,530 --> 00:19:57,670 And here we have another statement. 303 00:19:57,680 --> 00:20:02,590 So as you can see here if the STK version is actually less than number 23. 304 00:20:02,750 --> 00:20:10,390 OK permission is granted permission is automatically granted on STK less than number 23 upon installation. 305 00:20:10,440 --> 00:20:11,160 OK. 306 00:20:11,160 --> 00:20:12,770 Permission is granted return true. 307 00:20:12,780 --> 00:20:14,610 So this it is going I should return true. 308 00:20:14,700 --> 00:20:21,830 OK so now we need to actually override another builtin method in Android. 309 00:20:21,960 --> 00:20:25,200 And and here I'm going to pasting that method here. 310 00:20:25,200 --> 00:20:30,870 So as you can see here this is the builtin method that I actually pasted here on request permission 311 00:20:30,870 --> 00:20:31,650 result. 312 00:20:31,660 --> 00:20:37,530 So whenever you use that for example gives me an operation to use some features in Android D-SLR if 313 00:20:37,550 --> 00:20:38,480 it is going to be called. 314 00:20:38,530 --> 00:20:42,810 OK so this least fit as you can see our accepts some arguments. 315 00:20:42,900 --> 00:20:45,460 The first argument is request code. 316 00:20:45,510 --> 00:20:53,040 The second argument is permissions as you can see here we have an array of permissions and we have Grantley's 317 00:20:53,190 --> 00:20:56,360 results which is of type integer arii. 318 00:20:56,400 --> 00:20:56,960 OK. 319 00:20:57,240 --> 00:21:03,270 And here it called the superclass version of this method superdad and request the permission result 320 00:21:03,540 --> 00:21:06,400 request code permissions Granth results. 321 00:21:06,630 --> 00:21:12,190 And here I created an if statement if Granth results. 322 00:21:12,630 --> 00:21:13,370 Sub-Zero. 323 00:21:13,380 --> 00:21:13,770 OK. 324 00:21:13,830 --> 00:21:19,830 So if for example if the permission in index zero of this Granth results. 325 00:21:19,920 --> 00:21:24,990 So if you have these permissions for this permission write extension storage is going to be at index 326 00:21:24,990 --> 00:21:31,990 0 of this Granth results rate is equal to package manager package manager that permission granted. 327 00:21:32,070 --> 00:21:40,170 So if we can X access for example that the external storage and right on the card if that permission 328 00:21:40,170 --> 00:21:41,510 is granted to us. 329 00:21:41,790 --> 00:21:47,510 OK so is it this expression is going to be true if the permission is granted to us. 330 00:21:47,680 --> 00:21:52,950 Now it's created a large LUGG permission plus permissions. 331 00:21:52,950 --> 00:21:55,670 Sub-Zero was Granth results. 332 00:21:55,680 --> 00:21:56,200 OK. 333 00:21:56,280 --> 00:22:04,080 Sub-Zero so Granth results for example their results for actually giving us permission to use that feature 334 00:22:04,080 --> 00:22:04,650 in Android. 335 00:22:04,650 --> 00:22:07,400 OK so we need to override this method here. 336 00:22:07,500 --> 00:22:08,010 OK. 337 00:22:08,340 --> 00:22:10,610 And now inside is uncreate Smurfette. 338 00:22:10,620 --> 00:22:17,880 I'm going to actually writing MF it actually referred to this is stored is stored is permission granted 339 00:22:18,060 --> 00:22:24,900 here Ivan actually referred to dismember inside this uncreate Smurfit in order to show the user a message 340 00:22:25,110 --> 00:22:28,140 whether we can actually access the external storage or not. 341 00:22:28,150 --> 00:22:29,570 OK so here I can just type in. 342 00:22:29,570 --> 00:22:33,950 It is stored as storage permission granted semicolon. 343 00:22:34,110 --> 00:22:38,210 OK and now let's actually run our project and see what happens. 344 00:22:38,250 --> 00:22:45,600 So now as you can see here our application is actually running on this emulator and that device actually 345 00:22:45,600 --> 00:22:47,380 the application automatically. 346 00:22:47,380 --> 00:22:48,980 And now he's showing me this message. 347 00:22:49,110 --> 00:22:55,540 Allow app for free to access photos media and files on your device. 348 00:22:55,560 --> 00:23:02,940 So if I click on deny or I'm not allowed to access the SD card OK and if I click on allow I am allowed 349 00:23:03,180 --> 00:23:07,950 to access the SD card and write some data or it's Sunday to or from the SD card. 350 00:23:07,980 --> 00:23:08,570 OK. 351 00:23:08,760 --> 00:23:10,430 So this actually can deny. 352 00:23:10,700 --> 00:23:17,430 And now I don't have the permission to access any directory or files or photos in SD card. 353 00:23:17,640 --> 00:23:24,460 So let me actually click on this batch button here and now let me actually go to the background apps. 354 00:23:24,480 --> 00:23:26,650 So here this app is actually in the background. 355 00:23:26,670 --> 00:23:32,700 But this app this app is actually destroyed because I clicked I clicked on this back button in the undestroyed 356 00:23:32,700 --> 00:23:33,870 my father is actually current. 357 00:23:33,930 --> 00:23:39,740 So if I actually click on this app here again at the uncreate my fate is going to be called again. 358 00:23:39,870 --> 00:23:47,970 So now as you can see again it's showing us this message allow app 83 to access photos media and files 359 00:23:48,270 --> 00:23:49,590 and files on your device. 360 00:23:49,590 --> 00:23:51,450 So here we have another option. 361 00:23:51,450 --> 00:23:52,700 Never asked again. 362 00:23:52,740 --> 00:23:57,160 So if I check this option and then click on D-NY it's not going to show me this message again. 363 00:23:57,240 --> 00:24:03,440 And the user has to actually allow the permissions that this app needs in the settings app. 364 00:24:03,620 --> 00:24:05,010 In the Android device. 365 00:24:05,010 --> 00:24:05,550 OK. 366 00:24:05,760 --> 00:24:11,550 So if we actually check this option and now at this time I want to allow the user to access. 367 00:24:11,700 --> 00:24:15,340 For example allow the app to access the files in the SD card. 368 00:24:15,360 --> 00:24:15,780 OK. 369 00:24:15,870 --> 00:24:17,640 So let me actually click on now. 370 00:24:18,050 --> 00:24:21,910 And now I am allowed to access the files in SD card. 371 00:24:22,020 --> 00:24:31,020 OK so let me actually click on the spot button again and here again we actually open this up here and 372 00:24:31,020 --> 00:24:33,630 now it's not going to show me that message again. 373 00:24:33,840 --> 00:24:40,410 OK so here I am allowed to access the files in SD card and that's because of these methods that they 374 00:24:40,410 --> 00:24:43,170 actually put here in site of this class. 375 00:24:43,170 --> 00:24:43,730 OK. 376 00:24:44,010 --> 00:24:50,640 So here instead of just using this number of one I could just use these are requests that constant that 377 00:24:50,640 --> 00:24:51,710 they actually put here. 378 00:24:51,810 --> 00:24:52,670 OK. 379 00:24:52,740 --> 00:24:58,380 I created this constant here in order to show you that if you want to actually use other permissions 380 00:24:58,950 --> 00:25:03,780 other than this right external storage in Android here if you want to use other commissions you need 381 00:25:03,780 --> 00:25:07,200 to actually to use other request codes for those permissions. 382 00:25:07,200 --> 00:25:07,660 OK. 383 00:25:07,830 --> 00:25:10,730 So I created this up request court for showing you that. 384 00:25:10,770 --> 00:25:14,310 But here I just preferred to use this number one here. 385 00:25:14,400 --> 00:25:15,110 OK. 386 00:25:15,150 --> 00:25:16,710 So hopefully that makes sense.