Sample usage of the "android.app.Application.ActivityLifecycleCallbacks" class.

MainActivity.java

public class MainActivity extends Activity {

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    // Always register before calling into the super class.
    getApplication().registerActivityLifecycleCallbacks(new MyActivityLifecycleCallbacks(this));

    super.onCreate(savedInstanceState);
  }

  public static class MyActivityLifecycleCallbacks implements ActivityLifecycleCallbacks {

    private Activity activity;

    public MyActivityLifecycleCallbacks(Activity activity) {
      this.activity = activity;
    }

    @Override
    public void onActivityCreated(Activity activity, Bundle savedInstanceState) {
      if (this.activity == activity) {
        Log.i(activity.getClass().getSimpleName(), "onCreate(Bundle)");
      }
    }

    @Override
    public void onActivityStarted(Activity activity) {
      if (this.activity == activity) {
        Log.i(activity.getClass().getSimpleName(), "onStart()");
      }
    }

    @Override
    public void onActivityResumed(Activity activity) {
      if (this.activity == activity) {
        Log.i(activity.getClass().getSimpleName(), "onResume()");
      }
    }

    @Override
    public void onActivityPaused(Activity activity) {
      if (this.activity == activity) {
        Log.i(activity.getClass().getSimpleName(), "onPause()");
      }
    }

    @Override
    public void onActivitySaveInstanceState(Activity activity, Bundle outState) {
      if (this.activity == activity) {
        Log.i(activity.getClass().getSimpleName(), "onSaveInstanceState(Bundle)");
      }
    }

    @Override
    public void onActivityStopped(Activity activity) {
      if (this.activity == activity) {
        Log.i(activity.getClass().getSimpleName(), "onStop()");
      }
    }

    @Override
    public void onActivityDestroyed(Activity activity) {
      if (this.activity == activity) {
        Log.i(activity.getClass().getSimpleName(), "onDestroy()");
        activity.getApplication().unregisterActivityLifecycleCallbacks(this);
      }
    }
  }
}

That was useful to me, thanks!

Nice approach, Except that you will leak the activity in line 6 by passing this of a non final class.