1 00:00:00,440 --> 00:00:01,440 Hi everyone. 2 00:00:01,440 --> 00:00:06,270 So in this story we're going to go ahead and we're going to create another activity called Delete martial 3 00:00:06,270 --> 00:00:07,690 arts activity. 4 00:00:08,010 --> 00:00:14,150 So first of all let's go to this martial martial art class and let's modify this to stream of it. 5 00:00:14,220 --> 00:00:24,350 So instead of actually retaining this value let's actually first get the martial art ID plus two chords 6 00:00:24,390 --> 00:00:34,920 space plus get Martia that name plus two coats space plus get martial arts price plus two coats space 7 00:00:35,130 --> 00:00:38,810 plus and finally get Marshall at color. 8 00:00:38,840 --> 00:00:42,440 So let me create a new line here so that you can see what's going on here. 9 00:00:42,440 --> 00:00:43,610 Exactly. 10 00:00:43,610 --> 00:00:46,190 So first we want to out with this idea you get Marshall. 11 00:00:46,220 --> 00:00:49,950 The Marshall name Marshall Price and Marshall add color. 12 00:00:50,030 --> 00:00:55,440 So let's open the Android view here if you want to add that up in here you can just click on viewtiful 13 00:00:55,460 --> 00:00:58,170 windows and then click on a project. 14 00:00:58,460 --> 00:01:01,520 So here let's open this up for their Java. 15 00:01:01,820 --> 00:01:03,340 And here look at this first package. 16 00:01:03,350 --> 00:01:09,850 Just select this package here you can right click on this package and click on new activity. 17 00:01:09,990 --> 00:01:10,700 Activity. 18 00:01:10,890 --> 00:01:17,240 Actually the empty activity or you can just select this package or the top menu is going to find new 19 00:01:17,930 --> 00:01:21,790 activity and select empty activity. 20 00:01:21,800 --> 00:01:27,600 So here we need to specify the name of this activity which is going to be delete martial arts divied 21 00:01:27,620 --> 00:01:29,920 martial art activity. 22 00:01:31,630 --> 00:01:32,160 Right. 23 00:01:32,470 --> 00:01:37,570 So here it's going to generate a lay out File for us automatically activity like delete Underland martial 24 00:01:37,580 --> 00:01:39,000 art. 25 00:01:39,150 --> 00:01:44,080 Not going to be allowed to a lot of activity it's going to be backwards compatibility. 26 00:01:44,340 --> 00:01:49,490 This Richard is going to be in a belt this package is here you can see this package here. 27 00:01:49,490 --> 00:01:51,530 This is it is ok is fine. 28 00:01:51,590 --> 00:01:54,380 Just click on finish. 29 00:01:54,420 --> 00:02:01,410 So now all martial art activity class is created for us automatically and a layout file is also created 30 00:02:01,410 --> 00:02:02,750 for us automatically. 31 00:02:02,940 --> 00:02:08,080 And this activity is added to the manifest file automatically so we don't have to do anything here. 32 00:02:08,130 --> 00:02:14,100 We just need to create the activity here and the Android studio is going to do the rest for us. 33 00:02:14,100 --> 00:02:20,220 So now that we have this delete martial art activity class we are not going to design the user interface 34 00:02:20,280 --> 00:02:27,030 ourselves because we do not know we do not know that how many emotional objects exist to be that needs 35 00:02:27,030 --> 00:02:28,010 to be deleted. 36 00:02:28,350 --> 00:02:32,190 So if you are going to design the user interface programmatically. 37 00:02:32,510 --> 00:02:33,000 OK. 38 00:02:33,170 --> 00:02:35,990 We are not going to work with this at much of the activity here. 39 00:02:36,030 --> 00:02:42,780 For example adding Abati and what it takes you or it radio button you are going to design the user interface 40 00:02:43,020 --> 00:02:45,330 by using Jobar quotes. 41 00:02:45,390 --> 00:02:48,600 So let's go to this Tillett martial arts activity class. 42 00:02:48,600 --> 00:02:52,090 Let me double click on the tap here in order to make this area wider. 43 00:02:52,110 --> 00:02:56,510 First of all we need to have a variable of type database handler inside this class. 44 00:02:56,520 --> 00:03:03,120 So here inside this class lets actually say private database handler and the name of this variable is 45 00:03:03,120 --> 00:03:04,870 database handler semi-colon. 46 00:03:04,890 --> 00:03:10,170 Let's go to this uncreate Smurfette and let's initialize this value that we declared inside this class 47 00:03:10,170 --> 00:03:17,250 so database handler assignment operator new database handler and then we need to pass the context which 48 00:03:17,250 --> 00:03:22,450 is going to be delete much of that activity that this semicolon. 49 00:03:22,560 --> 00:03:25,550 Now we need to create a method here. 50 00:03:25,560 --> 00:03:27,300 Look at this method here says content view. 51 00:03:27,300 --> 00:03:33,960 Right now we need to create an effort in order to actually update the user interface in order to modify 52 00:03:33,960 --> 00:03:44,620 the view so the name of this effort is going to be update the user interface user interface and then 53 00:03:44,620 --> 00:03:50,380 put a bit of practice you semicolon so this it here when it is called it's going to update the user 54 00:03:50,380 --> 00:03:57,310 interface according to how many martial art objects that we have inside are a skill like database. 55 00:03:57,310 --> 00:04:03,670 So after the end in curly brace of this on creates Smurfette I'm going to create that method here. 56 00:04:03,730 --> 00:04:12,560 So just typing here private's voit the name of this method is update the user interface just put up 57 00:04:12,570 --> 00:04:18,530 for practice this year and then open and close this method by using these curly braces. 58 00:04:18,540 --> 00:04:24,300 So first of all we are going to get all the marginal objects that are inside of the school like database 59 00:04:24,540 --> 00:04:27,640 so I can't say I released. 60 00:04:27,870 --> 00:04:32,980 So just in the angle brackets specified the data type of the optics that are going to be inside these 61 00:04:33,010 --> 00:04:34,830 are aliased martial arts. 62 00:04:35,070 --> 00:04:43,330 The name of this rowdier it is going to be all martial art objects all martial art objects assignment 63 00:04:43,330 --> 00:04:44,280 operator. 64 00:04:44,380 --> 00:04:47,630 So we have a reference to the state of his handler right. 65 00:04:47,680 --> 00:04:54,380 So I can't say database handler that return all emotional objects semi-colon. 66 00:04:54,490 --> 00:04:56,770 That's as simple as that. 67 00:04:56,770 --> 00:04:58,370 Let me create a line here. 68 00:04:58,750 --> 00:05:05,230 So now this valuable holds all the martial art objects that are inside our database if any exist actually. 69 00:05:05,290 --> 00:05:11,330 So now I can say we need to create a variable of type relatively or an object of type relatively. 70 00:05:11,380 --> 00:05:17,290 Because we want to design the user interface programmatically so relatively out and an image of this 71 00:05:17,290 --> 00:05:17,560 rally. 72 00:05:17,570 --> 00:05:18,550 But it's relatively out. 73 00:05:18,550 --> 00:05:24,430 Assignment operator new relatively out and we need to pass the context to this construction of this 74 00:05:24,430 --> 00:05:25,210 relatively. 75 00:05:25,420 --> 00:05:34,250 So the construct the context actually is the lead marshal of activity that this semicolon. 76 00:05:34,300 --> 00:05:36,280 Now let's create a scroll. 77 00:05:36,310 --> 00:05:43,060 So just type in here scroll view and the name is scroll assignment operator new scroll view. 78 00:05:43,150 --> 00:05:50,090 So let's pass the context which is going to be delete martial art activity that this semicolon. 79 00:05:50,380 --> 00:05:57,070 So here the reason that we created this scroll view here is that we don't know how many martial art 80 00:05:57,160 --> 00:06:00,090 objects are actually inside their school or database. 81 00:06:00,250 --> 00:06:05,930 So we want to allow the user to scroll and see all the objects inside the scroll view. 82 00:06:06,160 --> 00:06:10,660 So let's actually add some more lines of code here. 83 00:06:10,970 --> 00:06:13,220 Let's create a radio group. 84 00:06:13,240 --> 00:06:20,050 So I want to show the user the martial art martial objects as a radio buttons so that when they use 85 00:06:20,040 --> 00:06:26,120 it actually the purchase or clicks on one of those radio buttons that object is going to be deleted 86 00:06:26,150 --> 00:06:28,090 completely from there so like database. 87 00:06:28,100 --> 00:06:29,240 And from the view. 88 00:06:29,440 --> 00:06:36,740 So radio group radio group assignment operator new radio group and me to pass the context which is did 89 00:06:36,740 --> 00:06:41,050 it Marshal activity that this semi-colon. 90 00:06:41,520 --> 00:06:48,570 So now let's create a fully in loop in order to iterate over each object that we have inside this Adelies 91 00:06:48,660 --> 00:06:50,030 all of objects. 92 00:06:50,160 --> 00:06:51,890 So I can't say for. 93 00:06:52,260 --> 00:07:00,730 So let's create a variable of type martial art and then here martial art co-lead all martial art objects. 94 00:07:01,080 --> 00:07:04,340 So just open and close this fall in love by using this curly braces. 95 00:07:04,410 --> 00:07:09,360 So here let's create an object of type radio button so just type in here. 96 00:07:09,450 --> 00:07:14,970 Radio button radio button assignment operator Neo radio button. 97 00:07:15,090 --> 00:07:15,520 Right. 98 00:07:15,650 --> 00:07:21,610 And now let's pass the context which is this one did Marshal activity that this semicolon. 99 00:07:21,660 --> 00:07:25,140 Now it's time to set the I.D. of this radio button. 100 00:07:25,140 --> 00:07:29,530 So a radio button that said I.D.. 101 00:07:30,180 --> 00:07:33,520 So the ID is going to be the ID of the martial art object. 102 00:07:33,540 --> 00:07:35,840 So we have this martial art object here right. 103 00:07:35,910 --> 00:07:42,090 So not is that this fall in love here is going to be executed for each martial art object that we have 104 00:07:42,100 --> 00:07:44,670 inside is Aurelia's all martial art objects. 105 00:07:44,730 --> 00:07:45,200 OK. 106 00:07:45,270 --> 00:07:50,400 So for the first time that this fall is going to be executed this very well martial art is going to 107 00:07:50,400 --> 00:07:57,870 hold the first object that we have inside this artist and it's going to continue executing this up until 108 00:07:57,870 --> 00:08:02,480 it reaches to the final object to this that is actually inside of this. 109 00:08:02,490 --> 00:08:07,380 All martial artists are released and it's going to execute that and then it's going to finish executing 110 00:08:07,380 --> 00:08:08,040 this portal. 111 00:08:08,190 --> 00:08:15,390 So if you want to specify the ID of this video and so notice that for each martial art object you are 112 00:08:15,390 --> 00:08:17,500 creating a new radio about it here. 113 00:08:17,580 --> 00:08:18,020 Right. 114 00:08:18,060 --> 00:08:19,810 Look at this line of code here. 115 00:08:20,070 --> 00:08:22,620 So you want to specify the radio button. 116 00:08:22,680 --> 00:08:27,860 So let's actually change this name the name of the city within to current radio button. 117 00:08:27,860 --> 00:08:31,610 It is more meaningful current radio button. 118 00:08:31,710 --> 00:08:39,930 Now lets say current radio button that said ID that I can refer to is martial art here martial arts 119 00:08:40,560 --> 00:08:44,900 that get martial art ID thats it. 120 00:08:44,910 --> 00:08:53,430 Now lets specify the text of this video and so current radio button that said text and the text is actually 121 00:08:53,730 --> 00:08:58,830 the text of our motion of objects so the two string Meffert that we overnighted inside their martial 122 00:08:58,830 --> 00:08:59,370 art class. 123 00:08:59,490 --> 00:09:02,920 So I can say martial art taught to strange. 124 00:09:02,950 --> 00:09:03,470 Thats it. 125 00:09:05,110 --> 00:09:10,920 And finally you are going to add this radio button to our radio group that we created here in line number 126 00:09:10,930 --> 00:09:17,100 58 so you already know how to use radio groups and radio buttons in the previous sections of this course. 127 00:09:17,110 --> 00:09:22,580 I talked about this concept that how we can use radio groups and radio buttons in Android. 128 00:09:22,840 --> 00:09:30,220 So here I just need to say radio group that at VU radio about in. 129 00:09:30,300 --> 00:09:30,990 Right. 130 00:09:31,350 --> 00:09:38,670 So after the end in curly brace of this for a loop here I'm going to actually create a listener for 131 00:09:38,670 --> 00:09:42,590 this radio group for the radio buttons that we have inside that radio group. 132 00:09:42,600 --> 00:09:46,770 So if anybody when whenever to use that I should interact with those radio buttons. 133 00:09:46,980 --> 00:09:48,110 We are going to be notified. 134 00:09:48,120 --> 00:09:52,050 This class with Marshal activity class is going to be notified about that. 135 00:09:52,350 --> 00:10:00,480 So I can actually refer to this radio group radio group that said on ticket change to the center now 136 00:10:00,480 --> 00:10:01,740 we need to pass the context. 137 00:10:01,740 --> 00:10:04,490 The context is this one delete martial art. 138 00:10:04,740 --> 00:10:06,610 That me actually pass the context here. 139 00:10:07,620 --> 00:10:10,690 Delete Marshlack of that activity that this. 140 00:10:11,010 --> 00:10:15,540 But here because we passed this contest which is going to be the listener right that this class is going 141 00:10:15,540 --> 00:10:19,060 to be the listener to the interaction of the user with the radio group. 142 00:10:19,170 --> 00:10:19,550 Right. 143 00:10:19,560 --> 00:10:23,010 This class is going to be notified when the user interacts with you. 144 00:10:23,160 --> 00:10:31,170 So because of that this class marshal activity class must implement their own check to change listener 145 00:10:31,200 --> 00:10:32,280 interface. 146 00:10:32,640 --> 00:10:40,140 So let's scroll to the top here and here it is Marshal activity extends accompted activity implements 147 00:10:41,440 --> 00:10:45,470 on take the change the center on chinked change. 148 00:10:45,580 --> 00:10:50,320 Listener radio group that unchecked change this and that this is really important. 149 00:10:50,430 --> 00:10:56,480 OK ladies if that unchecked change isn't so because now this class did most of the activity class is 150 00:10:56,510 --> 00:11:02,780 implemented this interface that did Marshal of activity class must implement the method which is going 151 00:11:02,780 --> 00:11:07,270 to be unchecked to change Mefford that is inside of this interface so let's scroll down here. 152 00:11:07,460 --> 00:11:13,870 And before the end in calibers of this emotional activity class we are going to actually implement that 153 00:11:13,870 --> 00:11:17,480 effort and take it change this and unchecked change. 154 00:11:17,480 --> 00:11:17,960 Listen. 155 00:11:18,260 --> 00:11:20,700 So this is the Meffert and this if it has to. 156 00:11:20,740 --> 00:11:23,720 PRIME MINISTER We can see the first one is Radio Group group. 157 00:11:23,960 --> 00:11:26,870 It is and the second argument is checked ID. 158 00:11:27,230 --> 00:11:30,330 So let's go inside this method and let's see what we are going to do now. 159 00:11:30,350 --> 00:11:38,270 So we already created an instance of type database handler so I can say database handler that deletes 160 00:11:39,500 --> 00:11:44,220 data was handled that delete Mazzara object from database by ID. 161 00:11:44,270 --> 00:11:48,030 So we need to pass the ID of a specific Matia object to be deleted. 162 00:11:48,290 --> 00:11:49,200 And look at this method. 163 00:11:49,220 --> 00:11:53,680 This method has an argument of type integer and is and it is checked ID. 164 00:11:53,870 --> 00:11:56,890 OK the ID of of that specific radio about it. 165 00:11:57,110 --> 00:11:58,660 So I can pass the idea here. 166 00:11:58,710 --> 00:12:04,890 Check ID VOIP you can pass this ID because here inside is updates the user interface method. 167 00:12:05,260 --> 00:12:06,470 Inside this for a loop. 168 00:12:06,560 --> 00:12:11,960 We actually created our radio button for each monster that object that we have inside this Aurelia's 169 00:12:11,990 --> 00:12:12,470 right. 170 00:12:12,530 --> 00:12:15,630 This really gets all module objects from this method from the database. 171 00:12:15,920 --> 00:12:22,340 So here we said that the ID of that radio button is the same ID as that martial art object that we have 172 00:12:22,340 --> 00:12:23,440 inside the database. 173 00:12:23,450 --> 00:12:27,770 So thats why if we passed the idea here checked ID of that button. 174 00:12:27,890 --> 00:12:34,140 It is going to delete that specific object with that specific ID inside the database. 175 00:12:34,340 --> 00:12:35,320 Right. 176 00:12:35,450 --> 00:12:43,860 So thats why it is more it is actually a very precise method a very precise way in order to delete up 177 00:12:44,000 --> 00:12:47,720 a specific motion of object from our database. 178 00:12:47,720 --> 00:12:52,670 So after this line of code here I can see so not just that if this doesnt make sense for now toward 179 00:12:52,680 --> 00:12:55,650 Florida you can always ask questions from me. 180 00:12:55,650 --> 00:12:59,990 You can send me a message and you to me or you can just post the discussion to the course and then I 181 00:12:59,990 --> 00:13:05,150 do my best to answer all of your questions and make sure to watch this section of the tutorials over 182 00:13:05,150 --> 00:13:09,200 and over again in order to understand what's going on here exactly. 183 00:13:09,290 --> 00:13:09,780 OK. 184 00:13:10,190 --> 00:13:16,670 So now after this and what I can say create a toast message in order to let the user know that that 185 00:13:16,730 --> 00:13:19,160 specific martial art object is actually deleted. 186 00:13:19,250 --> 00:13:27,110 So I can't say post does it make text and first we need to pass the context so the context is that much 187 00:13:27,110 --> 00:13:32,820 of that activity that this comma the text is going to be the Marshall object is deleted. 188 00:13:32,870 --> 00:13:36,680 Marshall object to martial art. 189 00:13:37,730 --> 00:13:42,260 Object is the word karma. 190 00:13:42,340 --> 00:13:46,500 Finally if it is specified the length short that shock. 191 00:13:46,870 --> 00:13:47,310 Right. 192 00:13:47,500 --> 00:13:49,570 So let me create a new line here. 193 00:13:50,410 --> 00:13:51,040 So that's it. 194 00:13:51,070 --> 00:13:51,610 This is. 195 00:13:51,680 --> 00:13:56,050 Unchecked change my fate then the user actually interacts with the radio buttons that are instead of 196 00:13:56,050 --> 00:13:56,990 the radio group. 197 00:13:57,050 --> 00:13:58,620 This is going to be executed. 198 00:13:58,630 --> 00:14:01,570 So it's going to delete that much object from our database. 199 00:14:01,600 --> 00:14:06,490 So let's go back to our Mefford updates the user interface my 5th here after this line of code that 200 00:14:06,490 --> 00:14:09,800 sets the listener up for these radio call here. 201 00:14:09,810 --> 00:14:11,960 I can say. 202 00:14:12,140 --> 00:14:17,190 So let's create our new button inside our layout. 203 00:14:17,190 --> 00:14:21,900 Delete most of that activity actually so that when that user wants to for example go back to the main 204 00:14:21,900 --> 00:14:22,920 activity class. 205 00:14:23,040 --> 00:14:27,680 These are the can just easily click or touch that button in order to go back to that activity. 206 00:14:27,930 --> 00:14:34,710 But the Andretti were all the Android devices actually have the have the capability to allow the user 207 00:14:34,710 --> 00:14:36,630 to go back to their previous activity. 208 00:14:36,750 --> 00:14:37,360 OK. 209 00:14:37,920 --> 00:14:40,760 But we want to actually create that button here. 210 00:14:40,770 --> 00:14:47,580 I want to show you how we can create that button inside your layout and just allow the user to interact 211 00:14:47,580 --> 00:14:48,550 with that button. 212 00:14:48,570 --> 00:14:53,270 So let's create a button button PTEN back button PTEN back. 213 00:14:53,330 --> 00:14:53,930 Right. 214 00:14:53,970 --> 00:14:59,640 Assignment operator new button we need to pass the context so the context is did sort of activity that 215 00:14:59,670 --> 00:15:01,490 this semi-colon. 216 00:15:01,860 --> 00:15:04,760 So now when it is specified the text of this button. 217 00:15:04,770 --> 00:15:08,860 So just I mean he had and back that said text. 218 00:15:09,240 --> 00:15:14,390 So the text is going to be go back go back right. 219 00:15:15,810 --> 00:15:22,380 And then here I can say PTEN batch that set and click listener. 220 00:15:22,830 --> 00:15:25,140 So here we need to pass the context. 221 00:15:25,290 --> 00:15:28,400 So the context is going to be actually the listener right. 222 00:15:28,410 --> 00:15:32,450 So the listener is meant to be delit marshal that activity that this. 223 00:15:32,820 --> 00:15:39,530 So because this sort of the activity class is going to be the listener of the clicks of the touches 224 00:15:39,570 --> 00:15:42,600 or the interactions of the user with this button. 225 00:15:42,660 --> 00:15:47,100 This class must implement the view that unclick the center interface. 226 00:15:47,220 --> 00:15:48,730 So let's scroll to the top here. 227 00:15:48,900 --> 00:15:57,360 And after implementing this interface let's put a comma and now I can't say view does unclick listener 228 00:15:59,470 --> 00:16:05,050 so because now this class delete my social activity class is implementing this interface we need to 229 00:16:05,500 --> 00:16:07,000 overwrite the uncle or my friend here. 230 00:16:07,000 --> 00:16:08,010 So let's scroll down here. 231 00:16:08,050 --> 00:16:14,460 And before the curly brace of the still emotional acuity class I can just step in here and click. 232 00:16:14,890 --> 00:16:16,040 So override this method. 233 00:16:16,210 --> 00:16:19,310 And here I can just say finish. 234 00:16:19,840 --> 00:16:26,440 So by calling this if it finish this do it much like if the class is going to be finished and it's going 235 00:16:26,440 --> 00:16:32,770 to be eliminated so that the user so that they actually the lay out or the activity below this activity 236 00:16:32,770 --> 00:16:34,080 is going to be shown to the user. 237 00:16:34,180 --> 00:16:34,710 Right. 238 00:16:34,730 --> 00:16:39,120 So I notice that activities are going to be on top of each other. 239 00:16:39,310 --> 00:16:39,590 OK. 240 00:16:39,590 --> 00:16:46,300 When we open another activity the new activity is going to be on top of the previous activity so when 241 00:16:46,300 --> 00:16:51,850 we finished the current activity that the previous activity is going to be shown to the user. 242 00:16:51,850 --> 00:16:53,700 So we call finish method here. 243 00:16:53,740 --> 00:16:55,690 So let's scroll to the top here. 244 00:16:55,690 --> 00:17:02,530 So now that we have this in our fourth expedient patch method here I can say scroll view thought at 245 00:17:02,690 --> 00:17:05,180 view radio group. 246 00:17:05,320 --> 00:17:11,680 So if you are adding this radio group that actually contains all the radio buttons that we created here 247 00:17:12,100 --> 00:17:16,520 inside this will loop this radio clip contains all those radio buttons. 248 00:17:16,540 --> 00:17:21,340 Now you are adding this radio group to this scroll view so that the user can actually scroll between 249 00:17:21,370 --> 00:17:26,330 all these radio buttons or for example we have thousands of radio buttons. 250 00:17:26,350 --> 00:17:29,550 These are then scroll and see all those objects. 251 00:17:29,890 --> 00:17:32,460 So now I can say after this line of code. 252 00:17:32,740 --> 00:17:40,090 So now that we have this spot in here and patch let's specify the feet and the height and the position 253 00:17:40,120 --> 00:17:42,000 of the spot and inside are relatively. 254 00:17:42,030 --> 00:17:46,260 So remember that we have a relatively out we created here right. 255 00:17:46,270 --> 00:17:52,090 And we also have a scroll view this closely holds the radio group and the relatively out holds the scroll 256 00:17:52,090 --> 00:17:53,240 view right. 257 00:17:53,260 --> 00:17:58,370 So first of all let's specify the width and height and the position of this button back button here. 258 00:17:58,510 --> 00:18:02,070 So below this line of code that actually adds the radio group to the scroll view. 259 00:18:02,260 --> 00:18:11,270 I can see relatively out relatively out but lay out palms and the name of this table is going to be 260 00:18:11,410 --> 00:18:13,490 Potin problems. 261 00:18:13,770 --> 00:18:18,790 OK because I want to specify it it's and the height of this button assignment operator and again just 262 00:18:18,790 --> 00:18:24,820 like in here relatively out thought lay out perhaps and put a pair of practice this year. 263 00:18:24,830 --> 00:18:29,690 I'm going to to specify the beat as the first argument and the second argument is the height. 264 00:18:29,690 --> 00:18:33,940 So here are I actually forgot to put the new keyword here. 265 00:18:34,070 --> 00:18:35,610 So make sure to put in if you were here. 266 00:18:35,630 --> 00:18:42,380 So a new relatively to lay out for pullups and for the first argument I'm going to pass the value relatively 267 00:18:42,380 --> 00:18:47,120 out that let's put arms towards that content. 268 00:18:47,160 --> 00:18:47,480 OK. 269 00:18:47,510 --> 00:18:51,340 This is the weight of the button inside on electively out karma. 270 00:18:52,040 --> 00:18:56,220 And again relatively out does lay out palms. 271 00:18:56,440 --> 00:18:58,650 Does that content so this is the height of. 272 00:18:58,660 --> 00:18:59,510 But it's simply called. 273 00:18:59,590 --> 00:19:05,620 So let create actually a new line here so that you can see what's going on here exactly. 274 00:19:05,620 --> 00:19:09,530 So this is are actually at the height the button pumps right. 275 00:19:10,760 --> 00:19:14,470 So let's specify the position of this spot inside our relatives. 276 00:19:14,720 --> 00:19:20,750 I want this button to be at the bottom of the relativity of the at the bottom of the layout so I can 277 00:19:20,750 --> 00:19:24,140 say I can refer to this button perhaps here button. 278 00:19:25,470 --> 00:19:34,150 Prompts that add rule relatively out that actually align parent bottom. 279 00:19:34,170 --> 00:19:39,410 So it's going to align this button to the bottom of the pattern which is going to be the relatively 280 00:19:39,430 --> 00:19:40,110 out right. 281 00:19:40,110 --> 00:19:45,260 We're going to put the bottom inside relatively so that it's relatively or is the parent of the button. 282 00:19:45,270 --> 00:19:53,070 So if you are going to align the button to the bottom of the parent switches is this one and we're going 283 00:19:53,070 --> 00:20:01,980 to also position this button I should be at the center horizontal so potent parents that are the rule 284 00:20:02,790 --> 00:20:08,090 relatively out that center horizontal center part isn't. 285 00:20:08,090 --> 00:20:11,750 Now let's specify the margins of this. 286 00:20:11,780 --> 00:20:18,950 So I can't say but Pomerantz that set margins and here for the first value of it is specified the left 287 00:20:18,950 --> 00:20:21,260 margin is going to be zero comma. 288 00:20:21,530 --> 00:20:23,740 And then I mean to specify the top management again. 289 00:20:23,860 --> 00:20:27,490 Zero comma the right margin zero comma. 290 00:20:27,680 --> 00:20:31,640 And that Bardell Margene we are going to pass the values 70. 291 00:20:31,770 --> 00:20:32,620 OK. 292 00:20:32,930 --> 00:20:33,480 And that's it. 293 00:20:33,500 --> 00:20:38,580 This is our bottom margin of the button here. 294 00:20:38,630 --> 00:20:42,160 So now it's time to add this Spartan that we created here. 295 00:20:42,230 --> 00:20:44,900 These poems two are relative they are. 296 00:20:44,960 --> 00:20:53,340 So you can say relatively out that at view PTEN back comma and that we need to actually pass the pot. 297 00:20:53,410 --> 00:20:56,870 We're using this version of this method the child and the output. 298 00:20:56,900 --> 00:20:59,790 So we created this part perhaps here 14 polyps. 299 00:20:59,960 --> 00:21:00,850 That it. 300 00:21:01,250 --> 00:21:05,330 And finally we need to specify the port arms. 301 00:21:05,360 --> 00:21:10,860 Actually it is clearly a part of the scroll view because we want to put our scroll inside the relativity. 302 00:21:10,890 --> 00:21:15,420 And once there's scroll you to take the entire weight and the entire height of the rel. out. 303 00:21:15,560 --> 00:21:27,200 So I can actually again I can say scroll view does lay out palms that lay out palms the name of this 304 00:21:27,200 --> 00:21:35,020 valuable is going to be scroll viewport arms scroll view prompts assignment operator new scroll view 305 00:21:35,750 --> 00:21:44,830 let's say it is a pair of prentices here thought lay out perhaps scroll view that lay out poems and 306 00:21:44,960 --> 00:21:49,550 here for the video they actually create a new light years or so so that you can see what's going on 307 00:21:49,550 --> 00:21:50,690 here for the video. 308 00:21:50,720 --> 00:22:03,730 I can actually say scroll view that lay out poems that lay out poems that match parent comma scroll. 309 00:22:03,740 --> 00:22:11,990 You thought lay out poems that match parent this is going to be for the height match parent. 310 00:22:12,070 --> 00:22:15,760 So if it's at the height of this scroll view is going to be much parent. 311 00:22:15,790 --> 00:22:18,290 So let's put a semicolon here at the end of our statement. 312 00:22:18,550 --> 00:22:26,830 And here I can add this scroll view to the relatively out so I can say relatively out that ad view scroll 313 00:22:26,830 --> 00:22:28,490 view right. 314 00:22:30,240 --> 00:22:36,230 Also want to pass the parts that you created here so put a comma here and just type in here scroll Vieuxtemps 315 00:22:36,660 --> 00:22:41,560 OK at this scroll view these poems that relatively out here. 316 00:22:41,570 --> 00:22:47,780 And finally we are going to say that this layout that he created here inside the Smurfit is going to 317 00:22:47,780 --> 00:22:50,380 be the layout that we want to have. 318 00:22:50,420 --> 00:22:50,920 OK. 319 00:22:51,020 --> 00:22:53,000 So I can't see so I look at it. 320 00:22:53,000 --> 00:22:53,890 Scroll to the top here look. 321 00:22:53,930 --> 00:22:54,460 Look at this. 322 00:22:54,550 --> 00:22:57,090 Here uncreate this if it is called it's contents. 323 00:22:57,090 --> 00:23:01,850 If you order to lay out that activity underline did it Underland Marshall other landmarks other than 324 00:23:01,850 --> 00:23:02,630 art actually. 325 00:23:02,660 --> 00:23:07,370 So this method is going to be called in order to show that they are true to use user when the uncreate 326 00:23:07,370 --> 00:23:07,970 and if it is called. 327 00:23:07,970 --> 00:23:08,520 Right. 328 00:23:08,690 --> 00:23:11,050 But here inside is uncreate me. 329 00:23:11,120 --> 00:23:11,630 I said that. 330 00:23:11,630 --> 00:23:12,160 OK. 331 00:23:12,210 --> 00:23:18,990 All you want this to be called and if it is called You're actually designing the user interface programmatically 332 00:23:18,990 --> 00:23:22,700 we are adding the scroll view the relatively out radio groups the button. 333 00:23:22,700 --> 00:23:30,400 So here at the end if you're going to call this method set content view relatively at that me actually 334 00:23:30,410 --> 00:23:32,830 put it you said content view relatively. 335 00:23:33,380 --> 00:23:34,100 That's it. 336 00:23:34,100 --> 00:23:38,390 Now in this way we are designing the user interface programmatically. 337 00:23:38,390 --> 00:23:43,110 And before we run the application here let me tell you that insight is unchecked. 338 00:23:43,130 --> 00:23:44,170 Change method. 339 00:23:44,180 --> 00:23:49,400 So for example when it interacts with the radio button in say the radio group of any use it for example 340 00:23:50,000 --> 00:23:53,060 just clicks or touches one of those radio buttons. 341 00:23:53,890 --> 00:23:59,880 The martial art object that is related to the idea of that radio button is going to be deleted from 342 00:23:59,880 --> 00:24:00,700 our database. 343 00:24:00,900 --> 00:24:01,410 Right. 344 00:24:01,590 --> 00:24:07,200 So that means an object is going to be deleted from all alleles that we have inside is update the user 345 00:24:07,200 --> 00:24:09,510 interface method that means scroll here to the top. 346 00:24:09,510 --> 00:24:10,670 You can see this. 347 00:24:10,930 --> 00:24:13,240 Let's look at this line of code here in line number 58. 348 00:24:13,240 --> 00:24:20,000 We created a variable of the released and its name is all almost all objects and we get is almost all 349 00:24:20,050 --> 00:24:23,300 motional objects from the Smurfette return all martial art objects. 350 00:24:23,790 --> 00:24:28,470 So according to this release we are creating a great deal about radio buttons right. 351 00:24:28,470 --> 00:24:34,620 So when a modular object is actually deleted from our database This means that we are going to have 352 00:24:35,460 --> 00:24:40,160 for example we are not going to have a radio button for that emotional object. 353 00:24:40,410 --> 00:24:48,050 So here when they use it for example it's one of those Monserrat objects you want to also update the 354 00:24:48,050 --> 00:24:48,770 user interface. 355 00:24:48,780 --> 00:24:55,340 You're inside the Smurfit so that the user interface is going to show the martial art objects of all 356 00:24:55,550 --> 00:25:02,000 the radio buttons that are related to the monitor the optics that are actually inside our database not 357 00:25:02,000 --> 00:25:04,200 the Monserrat objects that are deleted. 358 00:25:04,250 --> 00:25:08,980 So it's necessary to call this method here inside this unchecked change if it below it is at the top 359 00:25:09,310 --> 00:25:10,680 of that matrix method. 360 00:25:11,000 --> 00:25:12,100 So that's it. 361 00:25:12,110 --> 00:25:14,920 Now let's run an application and let's see what happens. 362 00:25:15,080 --> 00:25:16,500 Let me show you the emulator. 363 00:25:16,700 --> 00:25:20,090 So here you can see that our application is running on the simulator. 364 00:25:20,090 --> 00:25:21,030 Let's click on. 365 00:25:21,080 --> 00:25:26,510 Actually let me click on this dropdown menu and here click on delete the martial art as you can see. 366 00:25:26,510 --> 00:25:27,410 Nothing happened. 367 00:25:27,410 --> 00:25:28,060 Why. 368 00:25:28,070 --> 00:25:33,800 Because we didn't add the code to transition to the delete marshal or activity class when the user actually 369 00:25:33,980 --> 00:25:35,090 clicks on that. 370 00:25:35,250 --> 00:25:37,380 Actually menu item he had distilled it to. 371 00:25:37,430 --> 00:25:38,870 But in this item. 372 00:25:38,870 --> 00:25:42,380 So let's go to the actually to the main activity class. 373 00:25:42,380 --> 00:25:45,020 Let me open the Android view on here. 374 00:25:45,200 --> 00:25:46,490 Let's go to the main activity class. 375 00:25:46,490 --> 00:25:49,330 Let me double click on the stop here in order to make this area wider. 376 00:25:49,640 --> 00:25:53,710 So here look at this for an option I then selected. 377 00:25:53,720 --> 00:25:54,560 Right. 378 00:25:54,590 --> 00:25:56,110 So we have this case a statement. 379 00:25:56,120 --> 00:25:59,750 If the user for example touches the monster that item. 380 00:25:59,880 --> 00:26:07,770 Now it's time to add another case statement case or that Id dot delete martial art. 381 00:26:07,780 --> 00:26:10,510 Art did it martial of martial art. 382 00:26:10,690 --> 00:26:14,850 COLIN So this item is for any use that actually clicks or touches. 383 00:26:14,880 --> 00:26:21,620 This idea that martial art and in here can create an intent and the name of this intent is going to 384 00:26:21,620 --> 00:26:26,700 be delete martial arts intent. 385 00:26:27,370 --> 00:26:34,130 Assignment operator new intent and we need to pass the context which is going to be main activity that 386 00:26:34,130 --> 00:26:40,280 this comma and the second argument is going to be to actually the activity that we want to transition 387 00:26:40,280 --> 00:26:40,720 to. 388 00:26:40,720 --> 00:26:43,900 David Marshall that activity that class semicolon. 389 00:26:43,900 --> 00:26:46,070 So let me create a new line here. 390 00:26:46,500 --> 00:26:49,970 So now I can just say it starts activity. 391 00:26:50,150 --> 00:26:56,270 Martial marshal activity intense martial art intellectually and then here I just need to return TRUE 392 00:26:56,540 --> 00:26:59,340 return TRUE semicolon. 393 00:26:59,600 --> 00:27:01,550 So now let's an old application. 394 00:27:01,910 --> 00:27:06,170 So as you can see here our application is running on this emulator. 395 00:27:06,410 --> 00:27:09,910 Now I want you to actually take a look at this. 396 00:27:10,070 --> 00:27:15,470 Actually the emulator here our application is going to crash if we want to transition to the Delete 397 00:27:15,590 --> 00:27:17,030 the Marshlack activity. 398 00:27:17,600 --> 00:27:21,130 And I want you to pause the video and debug the application. 399 00:27:21,130 --> 00:27:24,440 If I click on it again here delete the martial art as you can see. 400 00:27:24,440 --> 00:27:31,770 Now my app is going to crash if I go to address you here and if I click on Android monitor here it's 401 00:27:31,770 --> 00:27:36,480 going to actually show me here why our application crash if I scroll down here we can see look at these 402 00:27:36,480 --> 00:27:37,230 links here. 403 00:27:37,230 --> 00:27:41,060 It says delete marshal activity Java line 32. 404 00:27:41,280 --> 00:27:45,660 So it says this line of code he had this method this method calling update the user interface. 405 00:27:45,680 --> 00:27:47,440 If it is the cause of this error. 406 00:27:47,640 --> 00:27:52,070 And we have this linkage delit monitor that activated the Java line 50. 407 00:27:52,080 --> 00:27:57,600 So here now it is inside this update the user interface Smurfette and the cause of this error is this 408 00:27:57,600 --> 00:27:59,660 line of code here in line number 50. 409 00:27:59,910 --> 00:28:03,980 Mistakenly I added a radio group to the radio group here. 410 00:28:04,020 --> 00:28:06,570 I must add late you bought into the radio. 411 00:28:06,570 --> 00:28:12,720 Actually the current radio button so radio that your radio call and radio button. 412 00:28:12,740 --> 00:28:13,190 OK. 413 00:28:13,350 --> 00:28:17,510 Now if I run the application again if I actually click on this dropdown menu. 414 00:28:17,520 --> 00:28:19,470 Now if I click on delete a martial art.. 415 00:28:19,470 --> 00:28:23,530 Now here we can see these marginal objects inside the scroll view. 416 00:28:23,580 --> 00:28:25,960 We have these Colebatch but in here at the bottom. 417 00:28:26,250 --> 00:28:32,450 So you can see here the ID of the first object of the first actually the radio button is one box and 418 00:28:32,820 --> 00:28:33,570 this is the prize. 419 00:28:33,570 --> 00:28:34,940 This is the color here. 420 00:28:34,980 --> 00:28:38,920 If I click on one of them you can see that it's a marshal object is deleted. 421 00:28:38,970 --> 00:28:43,990 If I click on this one it is actually deleted this one and this one right. 422 00:28:44,070 --> 00:28:47,870 If I click on go back now you can see this is our main activity here. 423 00:28:48,120 --> 00:28:52,280 Let's go to outmuscle update and let's add another object here. 424 00:28:52,290 --> 00:28:56,780 Boxing and martial art place for example 2000. 425 00:28:56,910 --> 00:28:59,960 The modular color for example blue here. 426 00:28:59,970 --> 00:29:03,640 If I click on at it it is going to add that to our database. 427 00:29:05,010 --> 00:29:07,960 And if I click on it again it is going to add that to our database. 428 00:29:07,980 --> 00:29:11,790 So let's add for example a bunch of Marshlack objects through our database. 429 00:29:11,790 --> 00:29:16,380 If I click on back button here now it is our main activity. 430 00:29:16,380 --> 00:29:22,500 Let's go to the little marshal art activity here so you can see now we have a scroll view of all these 431 00:29:22,500 --> 00:29:28,340 martial art objects that are presented to you to the user actually as radio buttons. 432 00:29:28,440 --> 00:29:29,030 Right. 433 00:29:29,100 --> 00:29:34,680 If the user presses on one of these radio buttons here you can see that that specific radio button is 434 00:29:34,680 --> 00:29:35,660 actually deleted. 435 00:29:35,880 --> 00:29:40,230 So for example this one you can see this one is deleted or this one. 436 00:29:40,260 --> 00:29:40,940 So that's it. 437 00:29:40,950 --> 00:29:45,450 If I could I can go back now you can see this is our main activity so thank you very much for watching 438 00:29:45,480 --> 00:29:50,920 it a story are we going to add another activity of the martial arts activity. 439 00:29:51,420 --> 00:29:52,900 So thank you very much for watching. 440 00:29:52,920 --> 00:29:57,360 If you have any questions about the consubstantial touch you so far please post a discussion in the 441 00:29:57,360 --> 00:30:00,090 course and then I do my best to answer all of your questions.