1 00:00:00,170 --> 00:00:06,570 Hire everyone in this theater are really going to go ahead and create our first team Android application. 2 00:00:06,570 --> 00:00:08,130 So we just need to click on this. 3 00:00:08,130 --> 00:00:10,350 Start any 100 studio project. 4 00:00:10,500 --> 00:00:17,440 And then here we need to actually assign a name to this application name so just type in here app 15. 5 00:00:17,550 --> 00:00:23,540 And here you can actually specify the company domain package name and project location. 6 00:00:23,730 --> 00:00:33,910 Click next choose API 16 Android 4.1 jellybean for your minimum STK next Blache activity next. 7 00:00:34,110 --> 00:00:36,550 And here don't change anything. 8 00:00:36,570 --> 00:00:37,710 And then click on finish. 9 00:00:37,710 --> 00:00:39,910 Now delete this text view here. 10 00:00:39,930 --> 00:00:40,950 Hello world. 11 00:00:41,220 --> 00:00:47,200 And then double click on the rest folder layout and then click on this activity other learned men are. 12 00:00:47,700 --> 00:00:53,400 And then here select this float in action button here and then press delete key on your keyboard. 13 00:00:53,420 --> 00:00:57,690 OK so let's actually go back and say this content on the line made that example. 14 00:00:57,880 --> 00:01:02,140 And now we need to actually design our user interface here. 15 00:01:02,210 --> 00:01:08,870 OK OK now let's actually drag a linearly out vertical inside this relatively out OK. 16 00:01:09,000 --> 00:01:16,910 Just put this linearly out vertical at the center of the screen and then lets actually drag linearly 17 00:01:16,920 --> 00:01:26,640 out horizontal into this linear left vertical and now drag to large takes views into this linearly out 18 00:01:26,670 --> 00:01:31,650 horizontally k 1 and 2. 19 00:01:32,100 --> 00:01:39,630 Soon as we can see if we have to take our viewers inside this linearly out horizontal OK so just select 20 00:01:40,080 --> 00:01:47,300 these two text views and for the layout we'd just assign the value zero. 21 00:01:48,090 --> 00:01:52,040 And for the left vate assign the value zero point five. 22 00:01:52,560 --> 00:01:58,560 So as you can see here these two values these two text views are actually taking only a half of the 23 00:01:58,560 --> 00:02:02,010 width of these linearly out horizontally k. 24 00:02:02,130 --> 00:02:09,040 We gave the value 0 to the left of each of these two text views and we assign the values 0.5 to the 25 00:02:09,040 --> 00:02:11,210 lay out rate of these two takes use. 26 00:02:11,280 --> 00:02:17,030 So that these two takes views can actually take the half of the linearly out horizontal. 27 00:02:17,170 --> 00:02:19,380 That these two takes use are inside it. 28 00:02:19,410 --> 00:02:23,930 So that's the purpose of actually assigning a value to lay out weight. 29 00:02:24,080 --> 00:02:30,310 OK so so that we can actually position our components relative to other components. 30 00:02:30,330 --> 00:02:32,110 OK so now let's actually. 31 00:02:32,160 --> 00:02:37,240 And are there linearly out horizontal into these linearly out vertical. 32 00:02:37,460 --> 00:02:45,790 OK and as you can see here we have another linearly and horizontal here and then let's drag a linearly 33 00:02:45,790 --> 00:02:49,760 out vertical inside this linearly horizontal. 34 00:02:50,340 --> 00:02:56,980 And let's drag another linearly out vertical inside these linearly horizontal OK. 35 00:02:57,210 --> 00:03:03,900 So as you can see here we have two linear layouts vertical inside of these linearly out horizontal. 36 00:03:03,900 --> 00:03:11,360 OK so now I want to actually drag a large takes you inside these are linearly out. 37 00:03:11,520 --> 00:03:18,300 That is inside of this are linearly out horizontal and lets actually drag another large takes you into 38 00:03:18,300 --> 00:03:24,170 this linearly vertical that is inside of this linearly and horizontally OK. 39 00:03:24,360 --> 00:03:25,420 So just put it here. 40 00:03:25,470 --> 00:03:31,990 So as you can see here I put another takes you inside this linearly out vertical OK. 41 00:03:32,220 --> 00:03:37,460 So just select these two linear layouts and then for the layout. 42 00:03:37,650 --> 00:03:42,870 Assign the value 0 and for the lay out weight assigned a values 0.5. 43 00:03:43,500 --> 00:03:49,130 So as you can see here now these two linear layouts these linearly elsewheres equal and this linearly 44 00:03:49,210 --> 00:03:57,030 with the call are actually taking only half of the weight of these linearly out horizontal that these 45 00:03:57,030 --> 00:03:58,900 ticks views are inside it. 46 00:03:59,010 --> 00:04:04,050 So as you can see here this linearly outward code is actually taking half of the width of this linearly 47 00:04:04,050 --> 00:04:05,410 out is on top. 48 00:04:05,730 --> 00:04:13,860 As you can see here and this linearly out vertical is actually taking a half of the V of these linearly 49 00:04:13,860 --> 00:04:14,760 out horizontal. 50 00:04:14,780 --> 00:04:19,250 Here as you can see and we actually put two text views inside of. 51 00:04:19,260 --> 00:04:21,580 These are linearly have two articles. 52 00:04:21,630 --> 00:04:27,620 So just double click on this text view here that is inside of this linearly I-30 call here. 53 00:04:27,740 --> 00:04:31,750 And for the text I just delete the text of this takes you. 54 00:04:31,980 --> 00:04:35,460 And for the ID just type in here ticks the index 55 00:04:38,010 --> 00:04:38,710 and. 56 00:04:38,880 --> 00:04:46,260 Select these this second text view and for the text delete the text of this text through and for the 57 00:04:46,260 --> 00:04:46,870 ID. 58 00:04:47,010 --> 00:04:51,040 Just typing here takes the value. 59 00:04:51,060 --> 00:04:56,970 OK so now let's actually go back and say this main activity that job of file and then actually delete 60 00:04:57,300 --> 00:04:59,570 these lines of code here that are actually related. 61 00:04:59,700 --> 00:05:06,200 The options menu and here delete this block of code that is actually related to the fluting action. 62 00:05:06,220 --> 00:05:10,810 But OK so now we can actually start coding here. 63 00:05:10,950 --> 00:05:14,820 First of all let's actually create to test view objects. 64 00:05:14,990 --> 00:05:24,970 So Takes Two takes the index to XTi index and then we need to actually put in an assignment operator. 65 00:05:25,170 --> 00:05:34,570 And here we need to cast this object to our text view object find view by id our ID 30 x the index. 66 00:05:34,570 --> 00:05:47,370 OK let's actually create another text view object takes the value text view find view by ID or that 67 00:05:47,430 --> 00:05:49,680 ID that X the right. 68 00:05:49,710 --> 00:05:55,210 OK now let's actually create two string objects strings. 69 00:05:55,720 --> 00:06:04,680 All it takes the index value all it takes the index value here. 70 00:06:04,720 --> 00:06:07,730 I don't actually instantiate this object. 71 00:06:07,840 --> 00:06:12,650 So as you can see here I didn't assign any value to this object to this string object. 72 00:06:12,760 --> 00:06:17,750 So this object inside the memory actually refers to a null value. 73 00:06:17,800 --> 00:06:19,240 So strange. 74 00:06:19,890 --> 00:06:24,340 All it takes the value. 75 00:06:24,920 --> 00:06:26,950 Value OK. 76 00:06:27,120 --> 00:06:30,810 OK so now let's actually create a constant fine on. 77 00:06:31,270 --> 00:06:31,920 OK. 78 00:06:32,260 --> 00:06:40,060 And here I need to specify the data type of y a constant int and I need to actually give a name to my 79 00:06:40,060 --> 00:06:41,010 constant. 80 00:06:41,110 --> 00:06:48,940 So I preferred to actually write my constants names by actually using capital letters. 81 00:06:48,940 --> 00:06:53,660 OK the name of your constant names should be uppercase. 82 00:06:54,010 --> 00:06:58,050 And I think it's a good convention in actually naming your constants. 83 00:06:58,060 --> 00:06:58,660 OK. 84 00:06:59,020 --> 00:07:00,700 So just step in here Len. 85 00:07:01,420 --> 00:07:05,060 Underline of a. 86 00:07:05,460 --> 00:07:06,200 OK. 87 00:07:06,550 --> 00:07:11,680 And then I here assigned a value of 15 to this constant. 88 00:07:11,680 --> 00:07:13,740 Now this actually creates an array. 89 00:07:13,990 --> 00:07:16,740 So the data type of my ARA is float. 90 00:07:16,880 --> 00:07:20,930 I want to actually create an array of floating point numbers. 91 00:07:20,930 --> 00:07:27,610 OK so the data type of My error is flawed and because I want to actually create an array I need to actually 92 00:07:27,610 --> 00:07:31,510 put a pair of brackets after my data type. 93 00:07:31,660 --> 00:07:32,280 OK. 94 00:07:32,620 --> 00:07:35,680 Now I need to actually give a name to my houri. 95 00:07:35,830 --> 00:07:44,890 So just typing here float float numbers array and then put an assignment operator here and here I want 96 00:07:44,890 --> 00:07:46,670 to actually create an array object. 97 00:07:46,690 --> 00:07:49,380 New float. 98 00:07:50,190 --> 00:07:55,810 And inside these brackets I need to actually specify the size of my arii. 99 00:07:55,850 --> 00:08:01,450 So as you can see here I created a constant here LeDuff of Array and I assigned the value 15 to this 100 00:08:02,000 --> 00:08:02,860 constant. 101 00:08:02,870 --> 00:08:08,990 So inside of these brackets I can just refer to the name of this line of array constant here. 102 00:08:09,320 --> 00:08:18,210 So at the size of my array is 15 I can actually assign 15 floating point numbers to disagree. 103 00:08:18,320 --> 00:08:25,250 OK because I did specify that this area is going to actually accept only fifteen point fifteen our floating 104 00:08:25,250 --> 00:08:25,950 point numbers. 105 00:08:25,980 --> 00:08:34,550 OK but as you can see here yet I didn't assign any values to those of empty places that are inside of 106 00:08:34,580 --> 00:08:35,210 this array. 107 00:08:35,210 --> 00:08:38,420 I just specified that the size of this array is 15. 108 00:08:38,420 --> 00:08:42,430 OK so let's actually create a for loop and inside the prentices. 109 00:08:42,430 --> 00:08:47,750 Let's actually create an integer variable int index assignment operator 0. 110 00:08:47,990 --> 00:08:51,890 Here I assigned the value 0 to this index valuable. 111 00:08:52,450 --> 00:08:59,030 And now I need to actually specify the condition in which this loop is going to be executed. 112 00:08:59,040 --> 00:09:01,670 So index less than. 113 00:09:01,910 --> 00:09:04,460 And here I need to refer to the name of this array. 114 00:09:04,460 --> 00:09:12,920 Float numbers are a total and so on until the value of these index variable is less than the value of 115 00:09:12,920 --> 00:09:15,170 the length of this array. 116 00:09:15,170 --> 00:09:17,100 This loop is going to be executed. 117 00:09:17,450 --> 00:09:24,860 So here I just need to take an index plus plus and this piece of code determines of what would be the 118 00:09:24,860 --> 00:09:28,730 value of this index variable every time. 119 00:09:28,730 --> 00:09:32,030 This loop is actually finished executing. 120 00:09:32,090 --> 00:09:38,180 And then it's going to actually check the condition in and then it's going to execute the lines of code 121 00:09:38,180 --> 00:09:40,400 that are actually inside of this loop OK. 122 00:09:40,590 --> 00:09:46,510 OK now you want to actually assign some values to these Arey OK. 123 00:09:46,730 --> 00:09:47,720 The indexes of this. 124 00:09:47,720 --> 00:09:48,110 I have a.