Getting value from async task class to another class

Issue

This is the error

This is my asyncResponse.java

 public interface asyncResponse {

    void processFinish(String output);
}

This is my trialmenu.java where i want to retrieve my value

abstract class trialmenu extends AppCompatActivity implements asyncResponse{
private ImageView logo;
private TextView status;

AsyncStatus asyncTask =new  AsyncStatus();


@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.newmenulayout);

    logo = (ImageView) findViewById(R.id.imglogo);
    status = (TextView) findViewById(R.id.txtStatus);

    AsyncStatus.delegate = this;


}



void processFinish(String output) {
    status.setText(output);


}
}

This is my AsyncStatus.java, I haven't posted my doInBackground for privacy reasons

public class AsyncStatus extends AsyncTask<String, String, StringBuilder> {

public static asyncResponse delegate=null;

@Override
protected void onPostExecute(StringBuilder result) {
    super.onPostExecute(result);

    delegate.processFinish(result.toString());


}
}

Solution

You have to register callback to AsyncTask class.

 public class AsyncStatus extends AsyncTask<String, String, StringBuilder> {

    public asyncResponse delegate=null;

    public void setDelegate(asyncResponse delegate){
            this.delegate=delegate;
    }

    @Override
    protected void onPostExecute(StringBuilder result) {
        super.onPostExecute(result);

        delegate.processFinish(result.toString());


    }
}

Do not use a static callback . And you can implement in your calling class by implementing asyncResponse or by Anonymous. And processFinish() implementation has to be public with @Override annotation.

abstract class trialmenu extends AppCompatActivity implements asyncResponse {
    private ImageView logo;
    private TextView status;
    AsyncStatus asyncTask = new AsyncStatus();
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.newmenulayout);
        logo = (ImageView) findViewById(R.id.imglogo);
        status = (TextView) findViewById(R.id.txtStatus);
        asyncTask.setDelegete(this);

    }

    @Override
    public void processFinish(String output) {
        // Callback
    }
}

Suggestion- Follow naming convention in java to make code more readable.

Answered By - ADM