使用支持库中的BottomSheet时如何调暗背景？

背景如何能像这里显示的那样变暗？

我通常使用CoordinatorLayout和BottomSheetBehavior来设置它。

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这将只显示底部表单。

public class MyBottomSheet extends BottomSheetDialogFragment {
    private static final String TAG = "MyBottomSheet";

    @NonNull
    @Override
    public Dialog onCreateDialog(final Bundle savedInstanceState) {
        final BottomSheetDialog dialog = (BottomSheetDialog) super.onCreateDialog(savedInstanceState);

        final View view = View.inflate(getContext(), R.layout.my_custom_view, null);

        dialog.setContentView(view);
        behavior = BottomSheetBehavior.from((View) view.getParent());

        return dialog;
    }

    public void show(final FragmentActivity fragmentActivity) {
        show(fragmentActivity.getSupportFragmentManager(), TAG);
    }
}

简单地按照正常的方式调用close()来关闭对话框。

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使用BottomSheetDialog

基本上它是一个对话框（即支持暗淡）和支持模式底部表单行为尝试

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