BottomSheetDialogFragment-如何设置扩展高度(或最小顶部偏移) [英] BottomSheetDialogFragment - How to set expanded height (or min top offset)

问题描述

我创建一个BottomSheetDialogFragment，我想调整它的最大展开高度.我怎样才能做到这一点?我可以找到BottomSheetBehaviour，但是我只能找到一个用于窥视高度的设置器，而不能用于扩展高度.

I create a BottomSheetDialogFragment and I want to adjust it's maximum expanded height. How can I do that? I can retrieve the BottomSheetBehaviour but all I can find is a setter for the peek height but nothing for the expanded height.

public class DialogMediaDetails extends BottomSheetDialogFragment
{
    @Override
    public void setupDialog(Dialog dialog, int style)
    {
        super.setupDialog(dialog, style);
        View view = View.inflate(getContext(), R.layout.dialog_media_details, null);
        dialog.setContentView(view);

        ...

        View bottomSheet = dialog.findViewById(R.id.design_bottom_sheet);
        BottomSheetBehavior behavior = BottomSheetBehavior.from(bottomSheet);
        behavior.setPeekHeight(...);
        // how to set maximum expanded height???? Or a minimum top offset?

    }
}

编辑

我为什么需要那个?因为我在全屏活动中显示了BottomSheet对话框，如果BottomSheet在顶部留出一个空格，这看起来很糟糕...

Why do I need that? Because I show a BottomSheet Dialog in a full screen activity and it looks bad if the BottomSheet leaves a space on top...

推荐答案

由于高度膨胀的视图被添加到具有layout_height=wrap_content的FrameLayout中，因此高度被包裹.请参阅 https中的FrameLayout(R.id.design_bottom_sheet). ://github.com/dandar3/android-support-design/blob/master/res/layout/design_bottom_sheet_dialog.xml .

The height is being wrapped because of the inflated view is added to the FrameLayout which has layout_height=wrap_content. See FrameLayout (R.id.design_bottom_sheet) at https://github.com/dandar3/android-support-design/blob/master/res/layout/design_bottom_sheet_dialog.xml.

下面的类使底部工作表全屏显示，背景透明，并完全扩展到顶部.

The class below makes the bottom sheet full screen, background transparent and fully expanded to the top.

public class FullScreenBottomSheetDialogFragment extends BottomSheetDialogFragment {


    @CallSuper
    @Override
    public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {
        super.onViewCreated(view, savedInstanceState);
        ButterKnife.bind(this, view);
    }


    @Override
    public void onStart() {
        super.onStart();
        Dialog dialog = getDialog();

        if (dialog != null) {
            View bottomSheet = dialog.findViewById(R.id.design_bottom_sheet);
            bottomSheet.getLayoutParams().height = ViewGroup.LayoutParams.MATCH_PARENT;
        }
        View view = getView();
        view.post(() -> {
            View parent = (View) view.getParent();
            CoordinatorLayout.LayoutParams params = (CoordinatorLayout.LayoutParams) (parent).getLayoutParams();
            CoordinatorLayout.Behavior behavior = params.getBehavior();
            BottomSheetBehavior bottomSheetBehavior = (BottomSheetBehavior) behavior;
            bottomSheetBehavior.setPeekHeight(view.getMeasuredHeight());
            ((View)bottomSheet.getParent()).setBackgroundColor(Color.TRANSPARENT)

        });
    }

}

---编辑2018年8月30日--- 一年后，我意识到背景色错了.当用户拖动对话框时，这将背景和内容一起拖动. 我对其进行了修复，以使底部工作表的父视图带有颜色.

--- EDIT Aug 30, 2018 --- I realized a year later that the background was coloured on a wrong view. This dragged the background along with the content while a user was dragging the dialog. I fixed it so that the parent view of the bottom sheet is coloured.

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