Android equivalent of getActivity() from/in ActionBarActivity

问题

Like my title says, i'm looking for an equivalent of getActivity() in my ActionBarActivity class in my Android project.

I want to pass an Activity parameter in AsyncTask declaration object, because i'm using an Activity object in my custom AsyncTask extended class

Here an example simplest code of my project

public class EventCreator extends ActionBarActivity {

private Context context;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_even_creator);
    View v = getLayoutInflater().inflate(R.layout.activity_even_creator,null);
    this.context = this.getBaseContext();

    final Button createButton = (Button)findViewById(R.id.createEventButton);
    createButton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            AsyncTask<Void,Void,Boolean> eventCreatorSend = new SendEvents(/* here need activity object */);
            eventCreatorSend.execute();
        }
    });

}

    class SendEvents extends AsyncTask<Void,Void,Boolean> {

        public Activity act;

        SendEvents(Activity a) {
            this.act = a;
        }

        @Override
        protected void onPreExecute() {
            super.onPreExecute();
            ((LinearLayout)act.findViewById(R.id.layout_loader_create_event)).setVisibility(View.VISIBLE);
        }

        @Override
        protected Boolean doInBackground(Void... params) {

            SystemClock.sleep(5000);
            return true;
        }

        @Override
        protected void onPostExecute(Boolean params) {
            if (params){

                ((LinearLayout)act.findViewById(R.id.layout_loader_create_event)).setVisibility(View.GONE);
                act.finish();
            }
            else {
                ((LinearLayout)act.findViewById(R.id.layout_loader_create_event)).setVisibility(View.VISIBLE);
                Toast.makeText(act,"Fail to send event",Toast.LENGTH_SHORT).show();
            }
        }


    };
}

In a time, i thought use getParent() from ActionBarActivity class, but it return a null object. So how to get the Activity object i want in ActionBarActivity class ?

回答1:

Try nameofactivity.this instead getActivity()

I always use getActivity() in Fragments Activities and .this in any other kind of Activity.

回答2:

Oh damn ! I just found a solution just after posting my ask.

I use MyClass.this, and it's done. Like this :

    AsyncTask<Void,Void,Boolean> eventCreatorSend = new SendEvents(EventCreator.this);
    eventCreatorSend.execute();

Hope that's can help someone !

回答3:

The easiest way is an Activity variable

// in your fragment
Activity myActivity;

@Override
public void onAttach(Activity activity) {
    super.onAttach(activity);
    //fragment shouts "i know my father!!!"
    myActivity = activity; //
}

now your activity instance(The father) can be represented anywhere

来源：https://stackoverflow.com/questions/30496286/android-equivalent-of-getactivity-from-in-actionbaractivity