How to call Activity method in an AsyncTask

Question

I would like to call an Activity method after the onPostExecute of my AsyncTask. Do you know how I can do that?

I want to call

Answer 1

Write a Callback

You can create a CallBack using an interface. This way you can use your AsyncTask with any activity. (Loosely coupled code)

1) Create a Callback

interface MyAsyncTaskCallBack{
 
   public void doStuff(String arg1,String arg2);

}  

2) Initialize the callback in your AsyncTask

private class MyTask extends AsyncTask
{
     private MyAsyncTaskCallBackactivity callback;

     public MyTask(MyAsyncTaskCallBackactivity callback)
     {
          this.callback = callback;
     }

     //Call callback.doStuff(....phonenum, ....message); in your postExecute

}

3) Implement the Callback in your Activity and override doStuff() method

public YourActivity extends AppCompatActivity implements MyAsyncTaskCallBack{

      // Your Activity code 
      // new MyTask(this).execute("phonenum","msg");    //<--- This is how you run AsyncTask

      private void sendMessage(String num, String msg){

          // send msg logic
      }

     @Override
     public void doStuff(String arg1,String arg2){
         sendMessage(arg1,arg2);  // invoke activity method
     }

}