[Android] Adding Dagger2 to your project in 4 quick steps

1.- Gradle dependencies

[global build.gradle]

classpath ‘com.android.tools.build:gradle:2.1.0’
classpath ‘com.neenbedankt.gradle.plugins:android-apt:1.4’

repositories {
jcenter()
maven { url “https://jitpack.io” }
}

[app/build.gradle]

apply plugin: ‘com.android.application’
apply plugin: ‘com.neenbedankt.android-apt’

compile ‘com.google.dagger:dagger:2.0.2’
apt ‘com.google.dagger:dagger-compiler:2.0.2’
provided ‘javax.annotation:jsr250-api:1.0’

2.- Root Component

@Component(modules = MainModule.class)
public interface RootComponent {

void inject(BaseActivity activity);
void inject(App application);

// …. more injections here
}

3.- Main Module

@Module
public class MainModule {
App application;
LoggedUserFacade facade;

public MainModule(App application) {
this.application = application;
facade = new LoggedUserFacade(application);
// … More dependencies here
}

@Provides
@Named(“applicationContext”)
Context provideApplicationContext() {
return application.getApplicationContext();
}

// … rest of the @Provides-annotated methods
}

4.- Application class

public class App extends Application {
MainModule mainModule;
RootComponent component;

@Override
public void onCreate() {
super.onCreate();

initializeDependencyInjection();
}

private void initializeDependencyInjection() {
mainModule = new MainModule(this);
component = DaggerRootComponent.builder()
.mainModule(mainModule)
.build();
component.inject(this);
}

public RootComponent getComponent() {
return component;
}

@VisibleForTesting public void setComponent(RootComponent component) {
this.component = component;
}
}

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