1 00:00:05,200 --> 00:00:06,500 Welcome back, everyone. 2 00:00:06,500 --> 00:00:10,100 The first place I like to start when reviewing an existing project 3 00:00:10,350 --> 00:00:13,350 is with the versions of the library that our code uses. 4 00:00:14,350 --> 00:00:17,350 In the Gradle Scripts section of the project pane, 5 00:00:17,710 --> 00:00:20,710 we've got two build.gradle files. 6 00:00:21,510 --> 00:00:23,510 You've seen these in earlier lectures 7 00:00:23,510 --> 00:00:26,310 when we converted the app to androidx, for example. 8 00:00:26,810 --> 00:00:30,010 You'll have created your version of this app much later than me 9 00:00:30,310 --> 00:00:33,310 and will probably have later versions of most things. 10 00:00:33,810 --> 00:00:35,810 But it's worth reviewing these files. 11 00:00:36,410 --> 00:00:39,210 Google is still working on the androidx libraries 12 00:00:39,210 --> 00:00:41,210 and your versions might be out of date. 13 00:00:41,710 --> 00:00:44,710 I'll start with the build.gradle project file. 14 00:00:47,370 --> 00:00:50,370 There are two things in here that change over time. 15 00:00:50,370 --> 00:00:53,070 The first is the version of the Kotlin plugin. 16 00:00:53,430 --> 00:00:58,030 Currently it's at version 1.3.71. 17 00:00:58,530 --> 00:01:02,530 And as you can see, I'm using version 1.3.21. 18 00:01:03,410 --> 00:01:06,110 Android has highlighted the plug-in version 19 00:01:06,110 --> 00:01:09,310 and suggests version 1.3.71. 20 00:01:09,910 --> 00:01:12,110 Type the new version in on line 4. 21 00:01:16,310 --> 00:01:20,410 You can sometimes use the light bulb on line 11 to choose a new version. 22 00:01:20,960 --> 00:01:23,760 But I've had little success getting that option to appear. 23 00:01:24,260 --> 00:01:26,560 Typing the new version is just easier. 24 00:01:27,110 --> 00:01:30,100 The gradle build version on line 10 25 00:01:30,100 --> 00:01:31,700 also updates frequently. 26 00:01:32,300 --> 00:01:35,550 But if you accepted android studio's dialog to update, 27 00:01:35,550 --> 00:01:39,750 it, should now be correct. At the time of recording this video, 28 00:01:39,750 --> 00:01:42,110 the version is 3.6.1. 29 00:01:42,810 --> 00:01:45,170 Click the sync now button, 30 00:01:45,530 --> 00:01:48,530 then open the build gradle module file. 31 00:01:54,030 --> 00:01:56,590 Once again, I've got quite a few suggestions. 32 00:01:57,090 --> 00:01:59,190 You probably won't have as many 33 00:01:59,190 --> 00:02:02,090 because you'll be using newer versions of the libraries. 34 00:02:02,690 --> 00:02:05,050 It's worth reviewing the suggestions though. 35 00:02:05,710 --> 00:02:09,210 When I started this project, the latest version of android 36 00:02:09,210 --> 00:02:10,710 was API 28. 37 00:02:11,070 --> 00:02:14,570 You can see in the compile SDK version 38 00:02:14,570 --> 00:02:16,270 and the target SDK version, 39 00:02:16,930 --> 00:02:18,290 both are set to 28. 40 00:02:19,290 --> 00:02:22,090 Unless you've got a good reason to do otherwise, 41 00:02:22,090 --> 00:02:24,690 set them both to the latest version of android. 42 00:02:31,590 --> 00:02:34,290 If you're watching this later in 2020 43 00:02:34,290 --> 00:02:36,890 and the next version of android has been released, 44 00:02:37,190 --> 00:02:40,190 then use that version rather than version 29. 45 00:02:40,690 --> 00:02:43,290 New versions are normally released around September 46 00:02:43,590 --> 00:02:47,190 but are available in beta from around April or May. 47 00:02:47,490 --> 00:02:50,490 Don't use the beta versions for a live app though. 48 00:02:51,290 --> 00:02:55,290 Next, we have the library versions in the dependencies section. 49 00:02:58,090 --> 00:02:59,690 I've got a few suggestions in there. 50 00:03:00,490 --> 00:03:04,690 The lifecycle extensions are now at version 2.2.0, 51 00:03:05,050 --> 00:03:08,350 not the 2.0.0 that I'm using here, 52 00:03:08,950 --> 00:03:10,150 that's on line 33. 53 00:03:11,150 --> 00:03:15,750 The light bulb works quite well here as long as you click somewhere on the line 54 00:03:15,750 --> 00:03:17,350 before the final colon. 55 00:03:18,250 --> 00:03:22,150 Use a light bulb and choose change to 2.2.0. Or if you prefer, 56 00:03:24,950 --> 00:03:27,550 you can just edit the line. 57 00:03:28,410 --> 00:03:31,730 Next, I'm using an alpha version of appcompat 58 00:03:31,730 --> 00:03:33,030 on line 37. 59 00:03:33,930 --> 00:03:38,730 It's a very bad idea to release an app that's using an alpha or beta version of the library. 60 00:03:39,530 --> 00:03:41,530 This is where we have to be careful. 61 00:03:42,030 --> 00:03:46,290 When I hover over that line, the suggestion is to use version 62 00:03:46,290 --> 00:03:50,490 1.2.0-alpha03. 63 00:03:50,790 --> 00:03:53,790 I'm not going to use that version. It's an alpha version. 64 00:03:54,450 --> 00:03:58,050 If your suggestion is for 1.2.0 without the alpha, 65 00:03:58,050 --> 00:03:59,050 then use that. 66 00:03:59,650 --> 00:04:02,650 I'm going to use version 1.1.0 67 00:04:02,650 --> 00:04:04,650 which is the current stable release. 68 00:04:09,050 --> 00:04:10,350 How do I know that. 69 00:04:10,850 --> 00:04:14,510 The easiest way to check is to copy the library name to your clipboard, 70 00:04:15,060 --> 00:04:19,660 that's androidx.appcompat:appcompat 71 00:04:20,260 --> 00:04:22,620 then, paste it into the Google search engine 72 00:04:25,120 --> 00:04:27,120 and add release history 73 00:04:30,780 --> 00:04:32,780 at the end, then search. 74 00:04:33,380 --> 00:04:36,940 You'll probably get several matches at developer.android.com. 75 00:04:37,440 --> 00:04:39,740 If you get a link to the maven repository, 76 00:04:39,740 --> 00:04:42,140 that should also give you the latest version. 77 00:04:42,800 --> 00:04:44,800 I'm going to use the first result 78 00:04:45,050 --> 00:04:49,050 to get to developer android jetpack androidx 79 00:04:49,050 --> 00:04:50,850 releases appcompat. 80 00:04:52,850 --> 00:04:54,850 In the banner, near the top of the page, 81 00:04:55,050 --> 00:04:59,150 we can see the current version in the current stable release column. 82 00:04:59,650 --> 00:05:01,350 That's the version we want to use. 83 00:05:02,450 --> 00:05:04,050 Back in android studio, 84 00:05:04,050 --> 00:05:07,850 I'll change all my libraries to use the latest stable releases. 85 00:05:08,650 --> 00:05:11,650 The section starts with a to-do about release versions 86 00:05:11,650 --> 00:05:14,010 to help make sure we don't release a version 87 00:05:14,010 --> 00:05:16,510 that contains alpha or beta libraries. 88 00:05:38,010 --> 00:05:40,010 If you get any other suggestions, 89 00:05:40,010 --> 00:05:44,710 change them as well. There may well be later versions available when you're watching this video. 90 00:05:45,590 --> 00:05:49,590 We're done. Remember to click the sync now link 91 00:05:49,590 --> 00:05:53,190 at the top right. If you get an error, 92 00:05:53,690 --> 00:05:54,990 go to the file menu, 93 00:05:56,490 --> 00:05:59,490 choose invalidate caches restart, 94 00:06:00,150 --> 00:06:04,350 choose the option to Invalidate and Restart when the dialog appears. 95 00:06:05,950 --> 00:06:09,450 I like to start with these build files in case there's a problem 96 00:06:09,450 --> 00:06:13,750 when we switch to a different Kotlin version or a different version of one of the libraries. 97 00:06:14,150 --> 00:06:17,750 In the next video, we'll start reviewing the code in our app. 98 00:06:17,750 --> 00:06:19,110 I'll see you there.