apply ui changes immediately

Question

I m coding some ui screens on android. sometime I need to see ui changes immediately, but that changes can be seen on next ui thread request. so, for example if I remove a view on screen and add another view programmatically, then change whole view (with viewAnimator), removing view can be observed, but new view can not be observed. I m sure new view is added, because when I go back to first page, new view is on screen.

which function should I call add or remove some view on screen to see its effect immediatlety ?

I tried invalidate(), but it doesnt work for my case

Answer 1

It sounds like, if you say the UI only updates on the next UI thread request, that you are modifying UI elements from another thread. Therefore, you must modify them in a Runnable using runOnUiThread. So, for example:

//example code
//where you are trying to modify UI components, do this instead
runOnUiThread(new Runnable(){
    public void run(){
        //update UI elements
    }
});

Answer 2

The best way to ensure that a change will be made to a view as soon as the view is ready is to add a Runnable to the view's message queue:

view.post(new Runnable(){
    @Override
    public void run() {
        //TODO your code
    }
});