Android

上机3：验证Activity生命周期
修改教材P56的例子3.1，验证P55页Activity生命周期。需要验证尽可能的生命周期路径，特别是onPause() -->onResume()。

class MyObserver implements LifecycleObserver {

  private static final String TAG = MyObserver.class.getSimpleName();
  
  @OnLifecycleEvent(Lifecycle.Event.ON_CREATE)
  public void onCreate() {
      Log.d(TAG, "onCreate called");
  }
  
  @OnLifecycleEvent(Lifecycle.Event.ON_START)
  public void onStart() {
      Log.d(TAG, "onStart called");
  }

  @OnLifecycleEvent(Lifecycle.Event.ON_RESUME)
  public void onResume() {
      Log.d(TAG, "onResume called");
  }

  @OnLifecycleEvent(Lifecycle.Event.ON_PAUSE)
  public void onPause() {
      Log.d(TAG, "onPause called");
  }

  @OnLifecycleEvent(Lifecycle.Event.ON_STOP)
  public void onStop() {
      Log.d(TAG, "onStop called");
  }

  @OnLifecycleEvent(Lifecycle.Event.ON_DESTROY)
  public void onDestroy() {
      Log.d(TAG, "onDestroy called");
  }

  @OnLifecycleEvent(Lifecycle.Event.ON_ANY)
  public void onAny() {
      Log.d(TAG, "onCreate | onStart | onResume | onPause | onStop | onDestroy called");
  }
}

public class MyActivity extends AppCompatActivity {

  @Override
  protected void onCreate(Bundle savedInstanceState) {
     // ...
     getLifecycle().addObserver(new MyObserver());
  }
}