Android "Top Sheet" 等同于 "Bottom Sheet"？

Question

我想实现一种 "Bottom Sheet" 类型的布局，但有一个扭曲，其中 "bottom" sheet 将是一个 MapFragment，它不会像up/down 可拖动视图。

我可能天真地想 "flip" "Top Sheet" 设计的逻辑，在其中拖动顶部 Sheet up/down 以显示 more/less底部 MapFragment.

即：从这个...

...[类似]这个...

如果有支持设计工具，这可能吗？还是我必须自己做这样的事情？

Answer 1

这是我在上面评论过的解决方案的基础。稍后我会回来充实它。

@Override
protected void onCreate(
        @Nullable
                Bundle savedInstanceState)
{
    super.onCreate(savedInstanceState);
    if (isFinishing())
    {
        return;
    }


    setContentView(R.layout.activity_home);

    ...

    mGroupBottomSheetFiller = (ViewGroup) findViewById(R.id.groupBottomSheetFiller);

    final NestedScrollView bottomSheetMap = (NestedScrollView) findViewById(R.id.bottomSheetMap);
    mBottomSheetMapBehavior = BottomSheetBehavior.from(bottomSheetMap);
    mBottomSheetMapBehavior.setBottomSheetCallback(new BottomSheetCallback()
    {
        @Override
        public void onStateChanged(
                @NonNull
                        View bottomSheet,
                int newState)
        {
            //Log.e(TAG, "mBottomSheetMapBehavior.onStateChanged(bottomSheet, newState=" +
            //             bottomSheetBehaviorStateToString(newState) + ')');
            int visibility = isBottomSheetExpanded(mBottomSheetMapBehavior) ? View.VISIBLE : View.GONE;
            mImageBottomSheetMapClose.setVisibility(visibility);
        }

        @Override
        public void onSlide(
                @NonNull
                        View bottomSheet,
                float slideOffset)
        {
            //Log.e(TAG, "mBottomSheetMapBehavior.onStateChanged(bottomSheet, slideOffset=" + slideOffset + ')');
            resizeMap();
        }
    });
    bottomSheetMap.getViewTreeObserver().addOnGlobalLayoutListener(new OnGlobalLayoutListener()
    {
        @Override
        public void onGlobalLayout()
        {
            //Log.e(TAG, "onGlobalLayout()");
            bottomSheetMap.getViewTreeObserver().removeOnGlobalLayoutListener(this);
            resizeMap();
        }
    });

    ...
}

private void resizeMap()
{
    int screenHeightPixels = PbPlatformUtils.getScreenHeightPixels();
    //Log.e(TAG, "resizeMap: screenHeightPixels=" + screenHeightPixels);

    int[] location = new int[2];
    mGroupMap.getLocationInWindow(location);
    //Log.e(TAG, "resizeMap: getLocationInWindow=" + Arrays.toString(location));

    LayoutParams groupMapLayoutParams = mGroupMap.getLayoutParams();
    groupMapLayoutParams.height = screenHeightPixels - location[1];
    mGroupMap.requestLayout();
}

public static String bottomSheetBehaviorStateToString(int state)
{
    String s;
    switch (state)
    {
        case BottomSheetBehavior.STATE_COLLAPSED:
            s = "STATE_COLLAPSED";
            break;
        case BottomSheetBehavior.STATE_DRAGGING:
            s = "STATE_DRAGGING";
            break;
        case BottomSheetBehavior.STATE_EXPANDED:
            s = "STATE_EXPANDED";
            break;
        case BottomSheetBehavior.STATE_HIDDEN:
            s = "STATE_HIDDEN";
            break;
        case BottomSheetBehavior.STATE_SETTLING:
            s = "STATE_SETTLING";
            break;
        default:
            s = "UNKNOWN";
            break;
    }
    return s + '(' + state + ')';
}

private static boolean isBottomSheetExpanded(
        @NonNull
                BottomSheetBehavior bottomSheetBehavior)
{
    return bottomSheetBehavior.getState() == BottomSheetBehavior.STATE_EXPANDED;
}

private void bottomSheetMapExpand()
{
    mGroupBottomSheetFiller.setVisibility(View.VISIBLE);
    int peekHeightPx = getResources().getDimensionPixelSize(R.dimen.home_bottom_sheet_map_peek_height);
    mBottomSheetMapBehavior.setPeekHeight(peekHeightPx);
    mBottomSheetMapBehavior.setState(BottomSheetBehavior.STATE_EXPANDED);
    mBottomSheetMapBehavior.setHideable(false);
}

private void bottomSheetMapCollapse()
{
    mGroupBottomSheetFiller.setVisibility(View.VISIBLE);
    int peekHeightPx = getResources().getDimensionPixelSize(R.dimen.home_bottom_sheet_map_peek_height);
    mBottomSheetMapBehavior.setPeekHeight(peekHeightPx);
    mBottomSheetMapBehavior.setState(BottomSheetBehavior.STATE_COLLAPSED);
    mBottomSheetMapBehavior.setHideable(false);
}

private void bottomSheetMapHide()
{
    mBottomSheetMapBehavior.setHideable(true);
    mBottomSheetMapBehavior.setPeekHeight(0);
    mBottomSheetMapBehavior.setState(BottomSheetBehavior.STATE_HIDDEN);
    mGroupBottomSheetFiller.setVisibility(View.GONE);
}

Answer 2

我找到了一个 TopSheetBehavior 实现并试图使其保持最新：https://github.com/carlos-mg89/TopSheetBehavior

事实证明，它在我的案例中非常有效。我发现许多其他 TopSheetBehavior 不完整或崩溃了，但这个不会崩溃，只需替换行为参数即可开箱即用：

<LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical"
        app:behavior_hideable="true"
        app:behavior_peekHeight="56dp"
        app:layout_behavior="your.package.components.TopSheetBehavior">

        <!-- Your content goes here -->

    </LinearLayout>

Android "Top Sheet" 等同于 "Bottom Sheet"？

Android "Top Sheet" equivalent of "Bottom Sheet"?

android

bottom-sheet