Get screen dimensions in pixels
I created some custom elements, and I want to programmatically place them to the upper right corner ( n pixels from the top edge and m pixels from the right edge). Therefore I need to get the screen width and screen height and then set position:
int px = screenWidth - m;
int py = screenHeight - n;
How do I get screenWidth and screenHeight in the main Activity?
If you want the display dimensions in pixels you can use getSize :
Display display = getWindowManager().getDefaultDisplay();
Point size = new Point();
display.getSize(size);
int width = size.x;
int height = size.y;
If you're not in an Activity you can get the default Display via WINDOW_SERVICE :
WindowManager wm = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);
Display display = wm.getDefaultDisplay();
Before getSize was introduced (in API level 13), you could use the getWidth and getHeight methods that are now deprecated:
Display display = getWindowManager().getDefaultDisplay();
int width = display.getWidth(); // deprecated
int height = display.getHeight(); // deprecated
For the use case you're describing however, a margin/padding in the layout seems more appropriate.
22 October 2015
Another ways is: DisplayMetrics
A structure describing general information about a display, such as its size, density, and font scaling. To access the DisplayMetrics members, initialize an object like this:
DisplayMetrics metrics = new DisplayMetrics();
getWindowManager().getDefaultDisplay().getMetrics(metrics);
We can use widthPixels to get information for:
"The absolute width of the display in pixels."
Example:
Log.d("ApplicationTagName", "Display width in px is " + metrics.widthPixels);
One way is:
Display display = getWindowManager().getDefaultDisplay();
int width = display.getWidth();
int height = display.getHeight();
It is deprecated, and you should try the following code instead. The first two lines of code gives you the DisplayMetrics objecs. This objects contains the fields like heightPixels,widthPixels.
DisplayMetrics metrics = new DisplayMetrics();
getWindowManager().getDefaultDisplay().getMetrics(metrics);
int height = metrics.heightPixels;
int width = metrics.widthPixels;
It may not answer your question, but it could be useful to know (I was looking for it myself when I came to this question) that if you need a View's dimension but your code is being executed when its layout has not been laid out yet (for example in onCreate() ) you can setup a ViewTreeObserver.OnGlobalLayoutListener with View.getViewTreeObserver().addOnGlobalLayoutListener() and put the relevant code that needs the view's dimension there. The listener's callback will be called when the layout will have been laid out.
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