how to check if activity is still in the stack?

Question

what is the better way to check if the activity is still in the stack in order to call it back ?

Intent i = new Intent(getApplicationContext(),MyClass.class)         


        

Answer 1

You can toggle global variable as indicator inside onCreate() and onDestory() of specific class, OR inside onActivityCreated() and onActivityDestroyed() of ActivityLifecycleCallbacks.

e.g.:

  registerActivityLifecycleCallbacks(new ActivityLifecycleCallbacks() {

      @Override
      public void onActivityCreated(Activity activity, Bundle savedInstanceState) {
          if (activity instanceof YourActivity) {
              myGlobalData.setActExist(true);
          } 
      }

      @Override
      public void onActivityDestroyed(Activity activity) {
          if (activity instanceof YourActivity) {
              myGlobalData.setActExist(false);
          }
      }
  });