android - 带有重力的全屏视图。设置过扫描值时，BOTTOM 会被意外剪裁

Question

我的 Android (8.0+) 应用程序在屏幕底部实现了一个狭窄的覆盖，但是当用户设置一个过扫描值时，它就会消失。如何让我的视图尊重实际可见的内容，以便 Gravity.BOTTOM 不会被剪裁？我尝试了无数的标志组合，但似乎没有任何东西承认过扫描值。

Point screen_size = new Point();
WindowManager.LayoutParams mParams;

WindowManager mWindowManager = getSystemService(WINDOW_SERVICE);
        mWindowManager.getDefaultDisplay().getRealSize(screen_size);

layout = new LinearLayout(getApplicationContext());
layout.setOnTouchListener(this);

// color for debug.
layout.setBackgroundColor(0x55ff0000);

mParams = new WindowManager.LayoutParams(
        screen_size.x,
        40,
        0,
        0,    
        WindowManager.LayoutParams.TYPE_APPLICATION_OVERLAY,
        WindowManager.LayoutParams.FLAG_LAYOUT_IN_SCREEN | WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE,
        PixelFormat.TRANSLUCENT);
mParams.gravity = Gravity.BOTTOM;
mWindowManager.addView(layout, mParams);