MyApp.java

package com.example;

import android.app.Activity;
import android.app.Application;
import android.content.Context;
import com.crashlytics.android.Crashlytics;
import dagger.ObjectGraph;
import java.util.concurrent.TimeUnit;
import com.example.util.CrashlyticsTree;
import timber.log.Timber;

public class MyApp extends Application {
  private ObjectGraph objectGraph;

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

    if (BuildConfig.DEBUG) {
      Timber.plant(new Timber.DebugTree());
    } else {
      Crashlytics.start(this);
      Timber.plant(new CrashlyticsTree());
    }

    buildObjectGraphAndInject();
  }

  public void buildObjectGraphAndInject() {
    long start = System.nanoTime();

    objectGraph = ObjectGraph.create(Modules.list(this));

    long diff = TimeUnit.NANOSECONDS.toMillis(System.nanoTime() - start);
    Timber.i("Global object graph creation took %sms", diff);
  }

  public static void inject(Object o, Context context) {
    get(context).injectInternal(o);
  }

  public static void inject(Activity activity) {
    get(activity).injectInternal(activity);
  }

  public void injectInternal(Object o) {
    objectGraph.inject(o);
  }

  public static MyApp get(Context context) {
    return (MyApp) context.getApplicationContext();
  }
}