1 00:00:00,150 --> 00:00:02,190 So hopefully that makes sense. 2 00:00:02,520 --> 00:00:08,820 And as you can see we created these objects here and now we can actually interact with these objects 3 00:00:09,120 --> 00:00:10,360 inside this screen. 4 00:00:10,540 --> 00:00:10,950 OK. 5 00:00:10,990 --> 00:00:11,990 OK everyone. 6 00:00:12,000 --> 00:00:22,730 Now let's actually typing here PTEN result that sets on Cleage listener new view that Uncle listener. 7 00:00:22,740 --> 00:00:23,380 OK. 8 00:00:23,610 --> 00:00:31,620 So as you can see here I made the Spartan to listen to the clique's that the user make on this button. 9 00:00:31,770 --> 00:00:37,590 And then it can actually execute some codes that we actually put inside these curly braces inside the 10 00:00:37,590 --> 00:00:40,040 curly braces of this unplugged Meffert. 11 00:00:40,050 --> 00:00:40,540 OK. 12 00:00:40,620 --> 00:00:48,560 So now I want to actually read the value that the user actually enter inside these textfield here. 13 00:00:48,660 --> 00:00:54,600 And then I were to actually read that value and then when the user click on the spot in here I want 14 00:00:54,600 --> 00:00:58,480 to get that value and then put that value inside these text. 15 00:00:58,490 --> 00:00:59,030 View here. 16 00:00:59,040 --> 00:00:59,680 OK. 17 00:01:00,000 --> 00:01:01,620 So let's see how we can do that. 18 00:01:01,760 --> 00:01:02,340 OK. 19 00:01:02,400 --> 00:01:09,270 Inside this unclear it first actually create a string object and let's actually give a name to this 20 00:01:09,480 --> 00:01:10,400 string object. 21 00:01:10,410 --> 00:01:14,580 For example text field value. 22 00:01:15,240 --> 00:01:22,440 And then I put an assignment operator here and then I actually refer to the name of this text object. 23 00:01:22,440 --> 00:01:22,800 OK. 24 00:01:22,820 --> 00:01:26,020 EDT the number. 25 00:01:26,610 --> 00:01:33,100 Get text dot to strange OK. 26 00:01:33,180 --> 00:01:36,910 If if I actually don't put this to a string Meffert Let's see what happens. 27 00:01:37,330 --> 00:01:39,710 As you can see it's now showing us an error. 28 00:01:39,730 --> 00:01:44,760 So as you can see let's actually hover our mouse pointer over this area and see what happens. 29 00:01:44,830 --> 00:01:53,050 It says incompatible types require Java or to land that string found Android that text that editable. 30 00:01:53,230 --> 00:02:01,240 So as you can see here because you're actually creating a value of type screen we need to assign a value 31 00:02:01,240 --> 00:02:03,520 of string to this value. 32 00:02:03,730 --> 00:02:10,780 But as you can see here this is the number that gettext actually returns a value of type editable. 33 00:02:10,980 --> 00:02:11,490 OK. 34 00:02:11,620 --> 00:02:15,340 And that's not compatible with this string object. 35 00:02:15,340 --> 00:02:22,650 So here there are two ways that we can to actually convert this returned value to a string value. 36 00:02:22,670 --> 00:02:29,460 You can just type in two streams or you can just put an A-plus operator here. 37 00:02:29,680 --> 00:02:31,770 And then you can just put into double quotes. 38 00:02:32,020 --> 00:02:32,450 OK. 39 00:02:32,530 --> 00:02:37,560 And in this way we are actually converting this value to us string value. 40 00:02:37,720 --> 00:02:41,270 And then we are assigning data value to this string object. 41 00:02:41,290 --> 00:02:47,040 OK so here we are actually getting the text that is inside of this. 42 00:02:47,080 --> 00:02:51,440 It is number object located inside of this text field here. 43 00:02:51,600 --> 00:02:58,930 OK remember that we actually gave up an ID to this textfield object as you can see it is the number. 44 00:02:59,170 --> 00:03:05,460 So now I am actually reading the text that is inside of these EDT. 45 00:03:05,530 --> 00:03:06,900 Number object. 46 00:03:07,120 --> 00:03:13,870 And now I want to actually put that right to you or a sign that read you to this directive result object. 47 00:03:13,870 --> 00:03:18,380 So here I can just type in TXI the result that said text. 48 00:03:18,910 --> 00:03:24,420 And then inside Apprentice's I can just revert to the name of this object textfield value. 49 00:03:24,460 --> 00:03:24,930 OK. 50 00:03:25,060 --> 00:03:27,780 Let's actually run our project and see what happens. 51 00:03:27,910 --> 00:03:32,160 So as you can see here now our application is running on this emulator. 52 00:03:32,160 --> 00:03:36,770 Now let's actually enter a number into this text field here. 53 00:03:36,790 --> 00:03:37,380 OK. 54 00:03:37,450 --> 00:03:39,950 So for example number 54. 55 00:03:40,200 --> 00:03:40,730 OK. 56 00:03:40,960 --> 00:03:42,880 So now let's actually click on this. 57 00:03:42,880 --> 00:03:45,960 Show me the result button here as you can see. 58 00:03:46,060 --> 00:03:51,440 Now the text of this text is changed and this value is here 54. 59 00:03:51,730 --> 00:03:52,450 OK. 60 00:03:52,810 --> 00:03:56,610 So another important point that I want to actually show you is that. 61 00:03:56,710 --> 00:04:03,190 So as you can see here this uncreate me if it actually is called when ever that we actually run our 62 00:04:03,190 --> 00:04:03,960 application. 63 00:04:03,970 --> 00:04:10,150 So when our application is actually started this method is going to be called and the codes inside of 64 00:04:10,150 --> 00:04:12,970 this method is going to be called once only once. 65 00:04:12,970 --> 00:04:13,710 OK. 66 00:04:13,960 --> 00:04:19,870 So as you can see here I've created some objects from this text view class from this area text class 67 00:04:20,230 --> 00:04:22,090 and from disputant class. 68 00:04:22,090 --> 00:04:28,480 And as you can see here the Android studio Id actually put this final cheap keyboard before these two 69 00:04:28,480 --> 00:04:30,450 objects automatically for us. 70 00:04:30,490 --> 00:04:37,720 So and that means these objects is going to be constant and we cannot actually change the value of these 71 00:04:37,720 --> 00:04:38,640 constants. 72 00:04:38,740 --> 00:04:41,050 Once we assign a value to these constants. 73 00:04:41,050 --> 00:04:41,640 OK. 74 00:04:41,770 --> 00:04:50,140 So here as you can see I actually assigned the value of this text the value the value of these textfield 75 00:04:50,140 --> 00:04:53,600 value object to this takes the result object here. 76 00:04:53,620 --> 00:04:54,150 OK. 77 00:04:54,280 --> 00:05:01,510 And I cannot actually refer to another value or to another object and then assign that why do you treat 78 00:05:01,520 --> 00:05:02,100 this object. 79 00:05:02,120 --> 00:05:10,770 Or you can only access the value of this object and the value of this object is the value of the EDT 80 00:05:10,790 --> 00:05:12,310 number textfield here. 81 00:05:12,310 --> 00:05:12,780 OK. 82 00:05:12,890 --> 00:05:20,290 So whenever we actually putting a text inside these textfield here that value is going to be assigned 83 00:05:20,290 --> 00:05:22,240 to these T it's the result here. 84 00:05:22,240 --> 00:05:22,750 OK. 85 00:05:22,900 --> 00:05:28,130 So here I can actually delete this number and I can actually assign an order value. 86 00:05:28,490 --> 00:05:32,880 And if I actually click on the spot in here as you can see this value is changed. 87 00:05:32,920 --> 00:05:33,320 OK. 88 00:05:33,430 --> 00:05:37,540 Because you are actually reading from this textfield object. 89 00:05:37,540 --> 00:05:41,810 This takes real object is an object of type string. 90 00:05:42,100 --> 00:05:50,170 And here you are actually assigning the value of that is inside of these textfield object a key number 91 00:05:50,410 --> 00:05:51,670 that get fixed. 92 00:05:51,820 --> 00:05:57,250 And here you are actually converting this value to a string value in order to assign this value to these 93 00:05:57,990 --> 00:05:59,980 textfield value object. 94 00:05:59,980 --> 00:06:00,660 OK. 95 00:06:00,880 --> 00:06:02,580 So hopefully that makes sense. 96 00:06:02,650 --> 00:06:10,090 And now I want to actually use the if statement here in order to show you how to use this control statement 97 00:06:10,110 --> 00:06:10,610 in. 98 00:06:10,810 --> 00:06:12,550 In our Android applications. 99 00:06:12,550 --> 00:06:13,210 OK. 100 00:06:13,660 --> 00:06:22,420 So now I can actually typing in here if and now inside Apprentice's I can just put up an expression 101 00:06:22,420 --> 00:06:26,200 here that's actual results in a true or false value. 102 00:06:26,200 --> 00:06:29,230 We can only put a value of type. 103 00:06:29,230 --> 00:06:35,050 True or false or and that results in a true or false value. 104 00:06:35,050 --> 00:06:36,250 So let me show you that. 105 00:06:36,460 --> 00:06:43,990 So here for example I want to specify that when ever that a user putting a number 51 into this or textfield 106 00:06:43,990 --> 00:06:49,400 here I want to actually put in another text beside that result. 107 00:06:49,480 --> 00:06:59,470 So let me show you that for example a text if text field value that contains and that inside the apprentice's 108 00:06:59,500 --> 00:07:05,860 I can just put in the wall 51 here and then I need to actually open and close my statement by using 109 00:07:05,860 --> 00:07:07,200 these curly braces. 110 00:07:07,210 --> 00:07:11,130 So now let me actually cut this line of code here. 111 00:07:11,200 --> 00:07:13,070 And let's actually put this line of code here. 112 00:07:13,270 --> 00:07:17,710 And now I can actually concatenate this value with another value for example. 113 00:07:17,710 --> 00:07:18,200 Great. 114 00:07:18,250 --> 00:07:18,880 OK. 115 00:07:18,940 --> 00:07:22,000 So let's actually run our project and see what happens. 116 00:07:22,000 --> 00:07:22,900 OK everyone. 117 00:07:22,900 --> 00:07:26,110 Now as you can see here I need to actually enter a value here. 118 00:07:26,110 --> 00:07:26,620 OK. 119 00:07:26,830 --> 00:07:31,230 So for example I can actually put in a number here for example number 50. 120 00:07:31,450 --> 00:07:32,080 OK. 121 00:07:32,080 --> 00:07:36,640 So if I actually click on this button here let's see what happens. 122 00:07:36,640 --> 00:07:39,150 So as you can see here nothing happened. 123 00:07:39,280 --> 00:07:39,730 OK. 124 00:07:39,850 --> 00:07:41,350 So what's going on here. 125 00:07:41,350 --> 00:07:47,620 So as you can see here inside this unclick Smurfette as you can see we are actually getting the value 126 00:07:47,620 --> 00:07:49,320 of these EDT. 127 00:07:49,360 --> 00:07:53,440 Number textfield here OK the value of this text here. 128 00:07:53,500 --> 00:07:53,950 OK. 129 00:07:54,010 --> 00:07:57,790 And we are actually assigning that value to this string object. 130 00:07:57,790 --> 00:07:58,170 OK. 131 00:07:58,180 --> 00:08:00,030 Textfield value. 132 00:08:00,070 --> 00:08:06,880 And here we are actually creating actually an if statement in order to actually specify that if only 133 00:08:06,880 --> 00:08:11,480 the value of these are textfield is 51. 134 00:08:11,650 --> 00:08:14,270 It's going to actually execute this line of code here. 135 00:08:14,410 --> 00:08:21,900 But if the value of these textfield value as you can see the value that is inside of these attacks will 136 00:08:21,910 --> 00:08:24,010 here is not 51. 137 00:08:24,130 --> 00:08:31,510 It is not going to execute any line of code here because we didn't specify that when the value of this 138 00:08:31,510 --> 00:08:33,640 textfield is not 51. 139 00:08:33,760 --> 00:08:34,870 So what should be done. 140 00:08:34,870 --> 00:08:43,120 So now I can actually putting in an else statement here and now I actually opened and close this statement 141 00:08:43,120 --> 00:08:48,530 here by using these curly braces I can actually put in another line of code so I can just type anti-X 142 00:08:48,550 --> 00:08:52,260 the result that said text. 143 00:08:52,900 --> 00:08:59,140 And then inside Apprentice's I can just put in two double quotes here and I can just typing in the value 144 00:09:00,880 --> 00:09:04,380 is not 51. 145 00:09:04,750 --> 00:09:05,540 OK. 146 00:09:06,070 --> 00:09:11,800 And the value is. 147 00:09:12,210 --> 00:09:18,090 And then I can actually concatenate this value with the value of these textfield value OK. 148 00:09:18,100 --> 00:09:20,530 So I can just type in here it takes me or do I do. 149 00:09:20,770 --> 00:09:27,130 So now as you can see for example if we actually change this number to number 51 and if I actually click 150 00:09:27,160 --> 00:09:27,490 on this. 151 00:09:27,490 --> 00:09:28,770 Show me the results button here. 152 00:09:28,780 --> 00:09:30,960 As you can see it says 51. 153 00:09:30,970 --> 00:09:31,390 Great. 154 00:09:31,420 --> 00:09:31,870 OK. 155 00:09:31,870 --> 00:09:35,100 So it did actually execute this line of code here. 156 00:09:35,170 --> 00:09:35,410 OK. 157 00:09:35,410 --> 00:09:41,320 Inside of these statements because these textfield actually contains this value 51. 158 00:09:41,500 --> 00:09:45,970 OK so now let's actually run our project again and let's see what happens.