How to get Nexus 7(flo) real screen resolution programmatically?

Question

My device is Nexus 7(Flo) .I want to get the real screen resolution,which the height is 1920,But the code

DisplayMetrics displayMetrics = mContext.getResources().getDisplayMetrics();
int   mPageHeight = displayMetrics.heightPixels;

returns 1824, which is the result of 1920 minus the NavigationBar's height(48dp). I know in Immersive Mode the decorView's height is 1920.But I want to acquire the value in "onCreate" method in Activity. DecorView's height is assigned too late.

So how to get the real screen resolution height?

Or is there a reliable way to know if the NavigationBar at bottom is showing ?You know most devices don't have that NavigationBar.

score 0 · Answer 1 · answered Jan 06 '15 at 11:29

You can get the full screen resolution by using this code

View decorView = context.getActivity().getWindow().getDecorView();
Point outSize = new Point();

decorView.getDisplay().getRealSize(outSize);
Log.i("ImmersiveHeight : "+outSize.y);

set the immersie mode to your activity by using this code

final int uiOptions = View.SYSTEM_UI_FLAG_LAYOUT_STABLE
                    | View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
                    | View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN
                    | View.SYSTEM_UI_FLAG_HIDE_NAVIGATION
                    | View.SYSTEM_UI_FLAG_FULLSCREEN 
                    | View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY;

decorView.setSystemUiVisibility(uiOptions);

I tried "activity.getWindow().getDecorView()".Unfortunatly it return 0 in "onCreate" or "onResume" method in Activity.It's assigined too late. My code which is initized in "onCreate" need that dimen.. — WZY, Jan 06 '15 at 11:40
in "onCreate" method ,getRealSize or getRealMetrics result NullPointerException .. — WZY, Jan 06 '15 at 11:53

score 0 · Answer 2 · answered Jan 07 '15 at 02:44

This code takes effect! I get 1920x1200 finally!

 public void printHeight(){
    int width = 0, height = 0;
    final DisplayMetrics metrics = new DisplayMetrics();
    Display display = getWindowManager().getDefaultDisplay();
    Method mGetRawH = null, mGetRawW = null;

    try {
        // For JellyBean 4.2 (API 17) and onward
        if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.JELLY_BEAN_MR1) {
            display.getRealMetrics(metrics);

            width = metrics.widthPixels;
            height = metrics.heightPixels;
            Log.i("ZYStudio", "with and height:"+width+"|"+height);
        } else {
            mGetRawH = Display.class.getMethod("getRawHeight");
            mGetRawW = Display.class.getMethod("getRawWidth");
            Log.i("ZYStudio", "rawW and rawH:"+mGetRawW+"|"+mGetRawH);

            try {
                width = (Integer) mGetRawW.invoke(display);
                height = (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();
            }
        }
    } catch (NoSuchMethodException e3) {
        e3.printStackTrace();
    }
}

Come from http://stackoverflow.com/questions/10991194/android-displaymetrics-returns-incorrect-screen-size-in-pixels-on-ics thanks — WZY, Jan 07 '15 at 02:45

How to get Nexus 7(flo) real screen resolution programmatically?

2 Answers2