Handler-Looper implementation in Android

Question

1. I have Activity with Handler (UI thread)
2. I start new Thread and make handler.post(new MyRunnable()) - (new work thread)

Android documentation s

Answer 1

Here's a rough pseudroidcode example of how to use handlers - I hope it helps :)

class MyActivity extends Activity {

    private Handler mHandler = new Handler();

    private Runnable updateUI = new Runnable() {
        public void run() {
            //Do UI changes (or anything that requires UI thread) here
        }
    };

    Button doSomeWorkButton = findSomeView();

    public void onCreate() {
        doSomeWorkButton.addClickListener(new ClickListener() {
            //Someone just clicked the work button!
            //This is too much work for the UI thread, so we'll start a new thread.
            Thread doSomeWork = new Thread( new Runnable() {
                public void run() {
                    //Work goes here. Werk, werk.
                    //...
                    //...
                    //Job done! Time to update UI...but I'm not the UI thread! :(
                    //So, let's alert the UI thread:
                    mHandler.post(updateUI);
                    //UI thread will eventually call the run() method of the "updateUI" object.
                }
            });
            doSomeWork.start();
        });
    }
}