I tried to use following code to get screen width and height in android app development:
Display display = getWindowManager().getDefaultDisplay();
int screenWidth = display.getWidth();
int screenHeight = display.getHeight();
but I got NullPointerException for my display, why? how to get screen width and height then?
below answer support api level below and above 10
if (Build.VERSION.SDK_INT >= 11) {
Point size = new Point();
try {
this.getWindowManager().getDefaultDisplay().getRealSize(size);
screenWidth = size.x;
screenHeight = size.y;
} catch (NoSuchMethodError e) {
screenHeight = this.getWindowManager().getDefaultDisplay().getHeight();
screenWidth=this.getWindowManager().getDefaultDisplay().getWidth();
}
} else {
DisplayMetrics metrics = new DisplayMetrics();
this.getWindowManager().getDefaultDisplay().getMetrics(metrics);
screenWidth = metrics.widthPixels;
screenHeight = metrics.heightPixels;
}