Question

I am looking for simple example code for setting up a Message in an AsyncTask and handling it in the Handler in the UI thread.

The examples I’ve seen deal with this inside a Service, and my app is not currently using any Services. Can a Message be used without a Service?

Example code would be appreciated!

Answer 1

public static final int MSG = 1;
private final Handler handler = new Handler(){
    @Override
    public void handleMessage(Message msg) {

        switch( msg.what ){
            case MSG:{

            }break;
        }
    }
}; 


@Override
public void onCreate(Bundle icicle) {
     super.onCreate(icicle);

     new YourAST(handler).execute();
}


public class YourAST extends AsyncTask<String, Void, Integer> {

    Handler mHandler = null;

    public YourAST(Handler handler){
         this.mHandler = handler;
    } 

    @Override
    protected Integer doInBackground(String... arg) {

        // send message to UIthread
        if(mHandler!=null)
        mHandler.sendEmptyMessage(YourClass.MSG);

        return null;
    }

}