Getting Started in Android Dev 2016

Guest lecture/talk for Comp Sci Bristol University - Nov 2016.

Transcript

1. GETTING STARTED WITH ANDROID DEV 2016 Scott Alexander-Bown @scottyab
2. WHO THE HECK IS THIS GUY? ➤ Freelance (remote) Android Developer ➤ https://scottyab.com ➤ Google Developer Expert for Android ➤ Founder/Organiser SWMobile Meetup ➤ http://swmobile.org ➤ Co-Author Android Security Cookbook ➤ Follow on Twitter @scottyab @scottyab
3. @scottyab
4. AT A GLANCE ➤Tools / IDE ➤Components ➤Dependancies / 3rd Party Libs ➤Tips *Reminder LAB - 11am to Midday, Wednesday 9th November 2016 Merchant Venturer's Building 2.11 Linux Computer Lab
5. What is Android?
6. https://developer.android.com @scottyab
7. @scottyab
8. Android Components @scottyab
9. ACTIVITY ➤ AKA a Screen ➤ has distinct lifecycle ➤ onCreate() ➤ onStart() ➤ onResume() ➤ onPause() ➤ onStop() ➤ onDestory() https://play.google.com/store/apps/details?id=name.peterscully.learning.activitylifecycle @scottyab
10. RESOURCES AND LAYOUTS ➤ Layouts • Xml ➤ Values • Strings • Styles ➤ Drawables
11. DESIGN XML
12. INTENTS ➤ Action ➤ Extra ➤ Primitives ➤ Parcelables public void sendMessage(String message) {
 Intent intent = new Intent(this, DisplayMessageActivity.class);
 intent.putExtra(EXTRA_MESSAGE, message);
 startActivity(intent);
 } @scottyab
13. @Override
 protected void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 setContentView(R.layout.activity_display_message);
 
 Intent intent = getIntent();
 String message = intent.getStringExtra(MainActivity.EXTRA_MESSAGE);
 
 TextView messageText = (TextView)findViewById(R.id.messageText);
 messageText.setText(message);
 }
14. SERVICES ➤ Background operations ➤ Lifecycle ➤ Service ➤ Bind ➤ IntentService ➤ Work thread ➤ Start with Intent @scottyab
15. ANDROID MANIFEST.XML @scottyab
16. LISTS / RECYCLERVIEW ➤ Xml Layout for list <RecyclerView> ➤ Layout for the row ➤ Adapter ➤ Binding ➤ ViewHolder ➤ RecyclerView.setAdapter(…) @scottyab
17. FRAGMENTS ➤ Reusable UI/Logic component ➤ Own Lifecycle @scottyab
18. .APK AND DISTRIBUTION ➤ Android apps are packaged as .apk files ➤ Signed with developer signing key ➤ Upload to the Play Store • $25 one off registration fee • Screen shots • Unique App Id @scottyab
19. Dependancies and 3rd party libraries
20. GRADLE ➤ Run from CI and IDE ➤ Easy dependancy management ➤ Build variants • types • flavours
21. INCLUDING DEPENDANCIES ➤ build.gradle dependencies {
 /*
 * Google Play services
 */
 compile 'com.google.maps.android:android-maps-utils:0.4.4'
 compile 'com.google.android.gms:play-services-maps:9.6.1'
 compile 'com.google.android.gms:play-services-location:9.6.1' @scottyab
22. INCLUDING DEPENDANCIES (JITPACK) compile 'com.github.scottyab:Calligraphy:v2.1.1_LABEL_FOR' @scottyab
23. SUPPORT LIBRARY ➤ Backward-compatible versions of framework components. ➤ UI elements to implement the recommended Android layout patterns. ➤ Support for different form factors. ➤ Miscellaneous utility functions. @scottyab
24. https://github.com/JakeWharton/butterknife UI: BUTTER KNIFE @scottyab
25. CONVERT JAVA OBJECTS INTO JSON AND BACK https://github.com/google/gson API: GSON @scottyab
26. TYPE-SAFE HTTP CLIENT MAKES APIS EASY SIMPLE ASYNC https://github.com/square/retrofit API: RETROFIT @scottyab
27. @scottyab
28. T ANDROID-ARSENAL.COM
29. @scottyab
31. USE GIT ➤ GitHub ➤ GitLab.com ➤ BitBucket @scottyab
32. TIPS ▸ Lock to portrait ▸ Focus on limited devices ▸ Test on demo devices ▸ Target SDK 15+ (or even 21+) @scottyab
33. AVOID ▸ Child Fragments ▸ Constraint layout ▸ Bleeding edge! @scottyab
34. FABRIC / CRASHLYTICS ➤ By Twitter ➤ Crash Reporting ➤ Beta distribution ➤ Analytics ➤ https://get.fabric.io @scottyab
35. SAMPLE APPS ▸ github.com/google/iosched ▸ github.com/googlesamples/android-topeka ▸ github.com/nickbutcher/plaid ▸ github.com/chrisbanes/philm ▸ github.com/JakeWharton/u2020 ▸ github.com/googlesamples @scottyab
36. @scottyab
37. THANKS swmobile.org github/scottyab @scottyab hello@scottyab.com QUESTIONS? LAB - 11am to Midday, Wednesday 9th November 2016 Merchant Venturer's Building 2.11 Linux Computer Lab
38. QUESTIONS? @scottyab