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

MainActivity.java

public class MainActivity extends Activity {

  private final MyActivityLifecycleCallbacks mCallbacks = new MyActivityLifecycleCallbacks();

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

  @Override
  protected void onDestroy() {
    super.onDestroy();

    // Always unregister after calling into the super class.
    getApplication().unregisterActivityLifecycleCallbacks(mCallbacks);
  }

  public static class MyActivityLifecycleCallbacks implements ActivityLifecycleCallbacks {

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

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

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

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

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

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

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

Thank you so much!