java - 使用叠加层时如何获得更暗的背景？

Question

我正在使用系统覆盖来显示一些内容。但我希望叠加层使背景变暗。我该怎么做？

这就是我想要的:

我是这样得到的:

这是我设置叠加层的代码:

overlay = LayoutInflater.from(this).inflate(R.layout.activity_popup_dictionary, null);

final WindowManager.LayoutParams params = new WindowManager.LayoutParams(
        WindowManager.LayoutParams.MATCH_PARENT,
        WindowManager.LayoutParams.MATCH_PARENT,
        WindowManager.LayoutParams.TYPE_SYSTEM_OVERLAY,
        WindowManager.LayoutParams.FLAG_NOT_TOUCH_MODAL,
        PixelFormat.TRANSLUCENT);

params.gravity = Gravity.BOTTOM;        
params.x = 0;
params.y = 100;

windowManager = (WindowManager) getSystemService(WINDOW_SERVICE);
windowManager.addView(overlay, params);

Answer 1

就我个人而言，我会将此代码设为 DialogFragment 并执行 onStart；这样你就可以自定义对话框的透明度

dialog.window.apply {
    attributes.apply {
        dimAmount = 0.50f
        flags = WindowManager.LayoutParams.FLAG_DIM_BEHIND
    }

    setBackgroundDrawable(ColorDrawable(0))
    setLayout(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT)
    setGravity(Gravity.CENTER)
}