在asynctask之前显示对话框

Question

I'm trying to show a "Loading" dialog before the async task starts working. With the following code what happens is that the dialog doesn't show untill all the async task is done his operations, the dialog is being prompted only in the end.

Here's the code:

    @Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_map);
    loadMap();
    progressBar = ProgressDialog.show(Map.this, "", 
            "Loading. Please wait...", true);

    //firing the asynctask here
}

The asynctask is doing pretty heavy operation, it takes like 10 seconds till I'm able to see the layout, that's why I want to prompt the user with a "Loading" dialog. but the user is able to see it only in the end of the asynctask operations for some reason.

What should I do?

EDIT: Forgot to mention that in the onProgressUpdate I'm doing some UI operations (Adding the overlays to the mapview). That's why the UI is freezing probably. but I just want to know how to show the loading dialog before, I don't care if the UI freezes after the "loading" dialog shows. Actually I do care, but I don't know if there's any better solution.

EDIT2: The loadmap function:

    public void loadMap()
{

        mapView = (TapControlledMapView) findViewById(R.id.mapview);
        mapView.setBuiltInZoomControls(true);
        mapController = mapView.getController();
        mapController.animateTo(new GeoPoint((int)(47.975 * 1E6), (int)(17.056 * 1E6)));
        mapView.setOnSingleTapListener(new OnSingleTapListener() {      
            @Override
            public boolean onSingleTap(MotionEvent e) {
                itemizedOverlay.hideAllBalloons();
                return true;
            }
        });
        myLocationOverlay = new FixedMyLocationOverlay(this, mapView);
        mapView.getOverlays().add(myLocationOverlay);
        mapView.invalidate();
        zoomToMyLocation();

        editText = (EditText)findViewById(R.id.search);
        editText.setOnFocusChangeListener(new OnFocusChangeListener() {

            @Override
            public void onFocusChange(View v, boolean hasFocus) {
                if(hasFocus)
                onSearchRequested();
                EditText editText = (EditText)v;
                editText.clearFocus();

            }
        });

}

Answer 1

您是否尝试过将loadMap()移到asynctask中？