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Getting Started in Android Dev 2016
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Scott Alexander-Bown
November 07, 2016
Technology
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Getting Started in Android Dev 2016
Guest lecture/talk for Comp Sci Bristol University - Nov 2016.
Scott Alexander-Bown
November 07, 2016
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Transcript
GETTING STARTED WITH ANDROID DEV 2016 Scott Alexander-Bown @scottyab
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
@scottyab
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
What is Android?
https://developer.android.com @scottyab
@scottyab
Android Components @scottyab
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
RESOURCES AND LAYOUTS ➤ Layouts • Xml ➤ Values •
Strings • Styles ➤ Drawables
DESIGN XML
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
@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); }
SERVICES ➤ Background operations ➤ Lifecycle ➤ Service ➤ Bind
➤ IntentService ➤ Work thread ➤ Start with Intent @scottyab
ANDROID MANIFEST.XML @scottyab
LISTS / RECYCLERVIEW ➤ Xml Layout for list <RecyclerView> ➤
Layout for the row ➤ Adapter ➤ Binding ➤ ViewHolder ➤ RecyclerView.setAdapter(…) @scottyab
FRAGMENTS ➤ Reusable UI/Logic component ➤ Own Lifecycle @scottyab
.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
Dependancies and 3rd party libraries
GRADLE ➤ Run from CI and IDE ➤ Easy dependancy
management ➤ Build variants • types • flavours
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
INCLUDING DEPENDANCIES (JITPACK) compile 'com.github.scottyab:Calligraphy:v2.1.1_LABEL_FOR' @scottyab
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
https://github.com/JakeWharton/butterknife UI: BUTTER KNIFE @scottyab
CONVERT JAVA OBJECTS INTO JSON AND BACK https://github.com/google/gson API: GSON
@scottyab
TYPE-SAFE HTTP CLIENT MAKES APIS EASY SIMPLE ASYNC https://github.com/square/retrofit API:
RETROFIT @scottyab
@scottyab
T ANDROID-ARSENAL.COM
@scottyab
None
USE GIT ➤ GitHub ➤ GitLab.com ➤ BitBucket @scottyab
TIPS ▸ Lock to portrait ▸ Focus on limited devices
▸ Test on demo devices ▸ Target SDK 15+ (or even 21+) @scottyab
AVOID ▸ Child Fragments ▸ Constraint layout ▸ Bleeding edge!
@scottyab
FABRIC / CRASHLYTICS ➤ By Twitter ➤ Crash Reporting ➤
Beta distribution ➤ Analytics ➤ https://get.fabric.io @scottyab
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
@scottyab
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
QUESTIONS? @scottyab