View mTopView = getLayoutInflater().inflate(R.layout.activity2, null);
final WindowManager.LayoutParams params = new WindowManager.LayoutParams(
200,
//getResources().getDisplayMetrics().widthPixels,
200,
//getResources().getDisplayMetrics().heightPixels,
WindowManager.LayoutParams.TYPE_SYSTEM_ALERT,
WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE | WindowManager.LayoutParams.FLAG_NOT_TOUCH_MODAL,
PixelFormat.TRANSLUCENT
);
WindowManager wm = (WindowManager) getSystemService(WINDOW_SERVICE);
wm.addView(mTopView, params);