[FIXED] Getting screen width on API Level 30 (Android 11): getDefaultDisplay() and getMetrics() are now deprecated. What should we use instead?

Issue

I currently calculate the screen width like this :

public static int getScreenWidth(@NonNull Context context) {
    DisplayMetrics displayMetrics = new DisplayMetrics();
    ((Activity) context).getWindowManager().getDefaultDisplay().getMetrics(displayMetrics);
    return displayMetrics.widthPixels;
}

Since these 2 functions (getDefaultDisplay() and getMetrics()) are now deprecated, what should we use instead ?

Solution

For calculating screen width minus any system bars, this should work:

public static int getScreenWidth(@NonNull Activity activity) {
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.R) {
        WindowMetrics windowMetrics = activity.getWindowManager().getCurrentWindowMetrics();
        Insets insets = windowMetrics.getWindowInsets()
                .getInsetsIgnoringVisibility(WindowInsets.Type.systemBars());
        return windowMetrics.getBounds().width() - insets.left - insets.right;
    } else {
        DisplayMetrics displayMetrics = new DisplayMetrics();
        activity.getWindowManager().getDefaultDisplay().getMetrics(displayMetrics);
        return displayMetrics.widthPixels;
    }
}

Note that this isn't exactly the same: testing this with the height produces different results, and I've been unable to replicate the old API's functionality with the new API (partly due to the behavior of the old API being a bit tricky to reason about and not always what you want, hence its deprecation). In practice, though, it should be good enough as a generic screen width for many things.

Answered By - Ryan M
Answer Checked By - Gilberto Lyons (JavaFixing Admin)