windowManager = (WindowManager) mContext.getSystemService(Context.WINDOW_SERVICE);
WindowParams = new LayoutParams(LayoutParams.FLAG_FULLSCREEN,LayoutParams.FLAG_FULLSCREEN);
WindowParams.type=LayoutParams.TYPE_SYSTEM_ERROR;
WindowParams.flags=LayoutParams.FLAG_ALT_FOCUSABLE_IM;
WindowParams.format=PixelFormat.TRANSPARENT;
WindowParams.gravity = Gravity.RIGHT | Gravity.TOP;
WindowParams.windowAnimations=android.R.style.Animation_Translucent; // 这里设置直接用系统的,自己实现也可
windowManager.addView(view, WindowParams);