Android: How to get the real screen size of the device?

Question

I have tried different ways to get the screen size of the device, but it always returned me the wrong size (791x480 instead of 854x480). It might be du

Answer 1

Try calling

    display.getRealSize();

DISCLAIMER: I did not realize this, but this will only work for API 17 (Android 4.2/JellyBean) and up.

Answer 2

I was facing the same problem on an Android 3.2 tablet. I tested both getRealSize and getDisplayMetrics. They are expected to crash as they meant to be available on API 17. But strangely getDisplayMetrics doesn't crash on my 3.2 and returns the correct dimension. getRealSize crashes.

Answer 3

if you want to get the size in the activity, you can make it by the following code.

findViewById(android.R.id.content).getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
        @Override
        public void onGlobalLayout() {
            View view =  findViewById(android.R.id.content);
            Log.e("test", "root view height is " + view.getHeight());

        }
    });

Answer 4

Try this

 final DisplayMetrics metrics = new DisplayMetrics(); 
    Display display = getWindowManager().getDefaultDisplay();     
    Method mGetRawH = null,mGetRawW = null;

try {

    // For JellyBeans and onward
    if(android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.JELLY_BEAN){

        display.getRealMetrics(metrics);
        realWidth = metrics.widthPixels;
        realHeight = metrics.heightPixels;
    }
    else{
    // Below Jellybeans you can use reflection method 

        mGetRawH = Display.class.getMethod("getRawHeight");
        mGetRawW = Display.class.getMethod("getRawWidth");

        try {
            realWidth = (Integer) mGetRawW.invoke(display);
            realHeight = (Integer) mGetRawH.invoke(display);
        } catch (IllegalArgumentException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IllegalAccessException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (InvocationTargetException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }