How to open dialog box in android as soon as game ends from surfaceview class - multithreading

Question

I have made a SurfaceView subclass in MainActivity which runs some animation/game/thread via canvas draw and I want a dialog box to appear as soon as game ends. I have made a function called openNewGameDialog where I call new AlertDialog.Builder(MainActivity.this) however since I am calling this from a thread it gives error. Please help!! Following is the code:
public class MainActivity extends Activity implements OnTouchListener{
GameSurface dSurface;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
dSurface=new GameSurface(this);
dSurface.setOnTouchListener(this);
initialize();
setContentView(dSurface);
}
private void initialize(){
}
#Override
protected void onPause() {
// TODO Auto-generated method stub
super.onPause();
dSurface.pause();
}
#Override
protected void onResume() {
// TODO Auto-generated method stub
super.onResume();
dSurface.resume();
}
private void openNewGameDialog(){
new AlertDialog.Builder(MainActivity.this)
.setTitle("hhhhhh")
.setItems(R.array.ok,
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub
}
})
.show();
}
public class GameSurface extends SurfaceView implements Runnable{
SurfaceHolder gameHolder;
Thread gameThread = null;
public GameSurface(Context context) {
super(context);
// TODO Auto-generated constructor stub
gameHolder = getHolder();
}
public void pause(){
isRunning = false;
while(true)
{
try {
gameThread.join();
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
break;
}
gameThread=null;
}
public void resume(){
isRunning = true;
gameThread = new Thread(this);
gameThread.start();
}
#Override
public void run() {
// TODO Auto-generated method stub
while(isRunning){
if(!gameHolder.getSurface().isValid())
continue;
Canvas canvas = gameHolder.lockCanvas();
canvas.draw something
if game==ends
openNewGameDialog();
gameHolder.unlockCanvasAndPost(canvas);
}
}
}
}

Answer 1

You must put the contents of openNewGameDialog() in a Runnable instead of a method and then call the runOnUiThread(Runnable r) method of the Activity class using that Runnable.
Any kind of UI manipulation can only be done by the UI thread. TherunOnUiThread(Runnable r) method queues the Runnable to the UI thread event queue.