WindowManager wm = (WindowManager) this
      .getSystemService(Context.WINDOW_SERVICE);
  int width = wm.getDefaultDisplay().getWidth();
  int height = wm.getDefaultDisplay().getHeight();

 WindowManager wm1 = this.getWindowManager();
  int width1 = wm1.getDefaultDisplay().getWidth();
  int height1 = wm1.getDefaultDisplay().getHeight();

 WindowManager manager = this.getWindowManager();
  DisplayMetrics outMetrics = new DisplayMetrics();
  manager.getDefaultDisplay().getMetrics(outMetrics);
  int width2 = outMetrics.widthPixels;
  int height2 = outMetrics.heightPixels;

 Resources resources = this.getResources();
  DisplayMetrics dm = resources.getDisplayMetrics();
  float density1 = dm.density;
  int width3 = dm.widthPixels;
  int height3 = dm.heightPixels;