Kickstart your Android development DINO KOVAČ ANDROID TEAM LEAD 

ABOUT INFINUM • independent design and development agency • 90 employees • 15 Android Engineers • hundreds of projects 

01 ANDROID STUDIO 2.0 

SHORTCUTS • CTRL + SHIFT + A → find action • SHIFT + F6 → rename • ALT + F7 → find usages • CTRL + SHIFT + O → open file 

DEBUGGER 

EVALUATE EXPRESSION 

PROFILING TOOLS • find bottlenecks in the app • identify memory leaks 

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02 ANDROID EMULATOR 2.0 

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03 DEBUGGING LAYOUTS 

DEVELOPER TOOLS ON DEVICE • to enable press build number 7 times (Settings - About phone) • you get a bunch of useful options 

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HIERARCHY VIEWER • inspect your view hierarchy at runtime • profile measure/layout/draw and find bottlenecks • comes with Android SDK 

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04 LIBRARIES 

GLIDE • simple image loading library • built-in caching • animated gifs! • https://github.com/bumptech/glide Glide.with(this).load("http://goo.gl/gEgYUd").into(imageView); 

OKHTTP • fast, well-tested and maintained http client • many features (spdy and http/2 support, websockets, …) • nice API (as opposed to HttpURLConnection) • http://square.github.io/okhttp/ 

GSON • JSON (de)serialization library from Google • Java objects <=> JSON string 

{
 "id": "2GC3t5Un6d1BEF5a6BTYo05jYCfv7OYcLvAJqxwRGPxT8xH1oY9ivM7uBFoY5Cvf",
 "ttl": 1209600,
 "userId": "565dc7fe6ebcd2f77e040728"
 } 

public class LoginResponse implements Serializable {
 
 @SerializedName("id")
 private String accessToken;
 
 @SerializedName("userId")
 private String userId;
 
 @SerializedName("ttl")
 private int timeToLive;
 
 public String getAccessToken() {
 return accessToken;
 }
 
 public String getUserId() {
 return userId;
 }
 
 public int getTimeToLive() {
 return timeToLive;
 }
 } 

RETROFIT • ‘turns your HTTP API into a Java interface’ • http://square.github.io/retrofit/ 

public interface ApiService {
 
 @POST("/api/users/login")
 Call authenticateUser(@Body LoginRequest loginRequest);
 
 @POST("/api/users")
 Call registerUser(@Body RegisterRequest registerRequest);
 
 @GET("/api/users/{userId}/timezones")
 Call> getTimezones(@Path("userId") String userId);
 
 @DELETE("/api/users/{userId}/timezones/{timezoneId}")
 Call deleteTimezone(@Path("userId") String userId, @Path("timezoneId") String timezoneId);
 
 @POST("/api/users/{userId}/timezones")
 Call createTimezone(@Path("userId") String userId, @Body Timezone timezone);
 
 @GET("/api/users")
 Call> getUsers();
 
 @PUT("/api/users/{userId}")
 Call updateUser(@Path("userId") String userId, @Body User user);
 
 @DELETE("/api/users/{userId}")
 Call deleteUser(@Path("userId") String userId);
 
 @GET("/api/users/{userId}/roles")
 Call> getUserRoles(@Path("userId") String userId); } 

BUTTERKNIFE • reduces boilerplate code to get view references • generates similar code to what you would write • also does resource binding (strings, drawables, colors, …) • http://jakewharton.github.io/butterknife/ 

WITHOUT BUTTERKNIFE TextView helloText;
 TextView secondHelloText;
 @Override
 protected void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 setContentView(R.layout.activity_main); secondHelloText = (TextView) findViewById(R.id.text_hello2);
 secondHelloText.setOnClickListener(new View.OnClickListener() {
 @Override
 public void onClick(View v) {
 // TODO
 }
 }); helloText = (TextView) findViewById(R.id.text_hello); // TODO
 } 

WITH BUTTERKNIFE // build.gradle compile 'com.jakewharton:butterknife:7.0.1' // MainActivity.java @Bind(R.id.text_hello2)
 TextView secondHelloText;
 
 @Override
 protected void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 setContentView(R.layout.activity_main);
 ButterKnife.bind(this); // TODO
 }
 
 @OnClick(R.id.text_hello)
 protected void onHelloClicked() {
 // TODO
 } 

HUGO • Annotation-triggered method call logging • https://github.com/JakeWharton/hugo @DebugLog
 public String getName() {
 return name;
 } V/EXAMPLE: ⇢ GETNAME() V/EXAMPLE: ⇠ GETNAME [0MS] = "JAKE WHARTON" 

DBFLOW • ORM library with annotation processing • generates code for interaction with SQLite databases so you don’t have to write it by hand 

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DBINSPECTOR • adds additional launcher icon for viewing db contents and schema • great for debugging db issues • https://github.com/infinum/android_dbinspector/ 

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THREETEN-ABP • backport of the new Date API introduced in Java 8 (JSR-310) • https://github.com/JakeWharton/ThreeTenABP 

LEAK CANARY • automatically detect common classes of memory leaks • https://github.com/square/leakcanary 

MAGIC VIEWS • easily use custom fonts in your app • https://github.com/ikocijan/MagicViews 

05 STAYING UP TO DATE 

• Jake Wharton • Reto Meier • Cyril Mottier • Dan Lew • Chris Banes • Mark Murphy • Mark Allison PEOPLE TO FOLLOW 

NEWSLETTERS TO READ • https://androidsweets.ongoodbits.com/ • http://androidweekly.net/ 

Use the source, Luke! 

INFINUM ANDROID TALKS • http://www.meetup.com/Infinum-Android-Talks-Zagreb/ • new libs • practical tips • a place to ask for advice • next event: 7.4.2016. at 18h CET (Strojarska 22) 

REFERENCES • http://developer.android.com/sdk/installing/studio- tips.html • http://stackoverflow.com/questions/294167/what-are- the-most-useful-intellij-idea-keyboard-shortcuts • http://developer.android.com/tools/debugging/ debugging-ui.html 

Any questions? [email protected] @DINO_BLACKSMITH Visit infinum.co or find us on social networks: infinum.co infinumco infinumco infinum