Using window in not Activity class?

Question

Before,I saw this snippet to find Height of statusbar?(and also Tiltebar) here:

Rect rectgle= new Rect();
Window window= getWindow();
window.getDecorView().getWindowVisibleDisplayFrame(rectgle);
int StatusBarHeight= rectgle.top;
int contentViewTop= 
    window.findViewById(Window.ID_ANDROID_CONTENT).getTop();
int TitleBarHeight= contentViewTop - StatusBarHeight;

Yesterday,I tried to use this snippet in an AsyncTask class.So I send instance of my Activity to AsyncTask class,in onCreate of Activity:

LongOperation loper = new LongOperation(this, vg, vArray, hintsArray,x_positionArray, y_positionArray);//Here `this` refers to current Activity
loper.execute("YES");

In doInBackground of AsynkTask class I only did:

Thread.sleep(3000);

And in onPostExecute method I copy above code to calculate height of statusbar and titlebar.But App crashes,without any useful log in logcat.Then I comment some lines like this:

Rect rectgle = new Rect();
    Window window = activity.getWindow();
//  window.getDecorView().getWindowVisibleDisplayFrame(rectgle);
//  int StatusBarHeight= rectgle.top;
    contentViewTop = window.findViewById(Window.ID_ANDROID_CONTENT)
            .getTop();
//  int TitleBarHeight= contentViewTop - StatusBarHeight;

and App works fine.So it seems that

window.getDecorView().getWindowVisibleDisplayFrame(rectgle);

causes App crashing,But I do not know why?Did I do some thing incorrect?

score 0 · Accepted Answer · edited May 23 '17 at 11:48

0

Well if you are running your app in Android 2.3.3 then there might happens that app got crash.Because this method is kind of broken.So this solution might help you.

Hope this helps :)

edited May 23 '17 at 11:48

Community

1
1

answered Jan 05 '13 at 09:02

AndroidLearner

4,500
4
31
62

Using window in not Activity class?

1 Answers1