Async Callback Example

AsyncResponse.java

/**
 * @author edgeorge
 *
 */
public interface AsyncResponse {	
	void onProcessFinish(String result, int id);
}

ExampleAsync.java

import android.os.AsyncTask;

public class ExampleAsync extends AsyncTask<String, Void, String> {

	private int id;
	public AsyncResponse delegate = null;
	
	public ExampleAsync(int id) {
		this.id = id;
	}
	
	
	@Override
	protected String doInBackground(String... params) {
		//do work here
		return null;
	}
	
	@Override
	protected void onPostExecute(String result) {
		super.onPostExecute(result);
		//call delegate
		delegate.onProcessFinish(result, id);
	}

}

Test.java

public class Test extends Activity implements AsyncResponse{

	private static final int ASYNC_ONE = 1; //ID for async

	@Override
	protected void onCreate(Bundle arg0) {

		//other activity stuff before this

		ExampleAsync async = new ExampleAsync(ASYNC_ONE);
		async.delegate = this;
                async.execute();

	}

        @Override
	public void onProcessFinish(String result, int id) {
		if(id == ASYNC_ONE){
		// process result
		}
	}

}