Question

如果我使用Modal BottomSheetFragment，如何添加BottomSheetBehavior？

    var bottomSheetBehaviorCallback = 
     object : BottomSheetBehavior.BottomSheetCallback() {

    override fun onSlide(bottomSheet: View, slideOffset: Float) {
        Log.d(Constants.LOG_INFO, "on slide")
    }

    override fun onStateChanged(bottomSheet: View, newState: Int) {
        Log.d(Constants.LOG_INFO, "onStateChanged")
    }
}

       val detailView = StationDetailFragment.newInstance(selectedStationID, "")
        detailView.show(fragmentManager, "detailView")

此时未创建视图

我更改了代码并添加了覆盖setupDialog。但我仍然没有回调工作

override fun setupDialog(dialog: Dialog?, style: Int) {

    val contentView = View.inflate(context, R.layout.fragment_station_detail, null)
    dialog!!.setContentView(contentView)

    val layoutParams = (contentView.parent as View).layoutParams as CoordinatorLayout.LayoutParams

    val behavior = layoutParams.behavior

    if (behavior != null && behavior is BottomSheetBehavior<*>) {
      behavior.setBottomSheetCallback(mBottomSheetBehaviorCallback)
    }
}

Answer 1

谢谢大家！对我来说最好的解决方案是将我的BottomSheet作为持久性底部工作表添加到activity_main.xml

以下解释对我有所帮助 Android working with Bottom Sheet

最后，我找到了使用kotlin

的Modal Bottomsheet解决方案

  override fun onCreateDialog(savedInstanceState: Bundle?): Dialog {


    val dialog = super.onCreateDialog(savedInstanceState) as BottomSheetDialog

    dialog.setOnShowListener { dialog ->
        val d = dialog as BottomSheetDialog

        val bottomSheet = d.findViewById<View>(android.support.design.R.id.design_bottom_sheet) as FrameLayout?
        bottomSheetBehavior = BottomSheetBehavior.from(bottomSheet!!)
        bottomSheetBehavior.state = BottomSheetBehavior.STATE_EXPANDED
    }

    return dialog

}

我的问题是我尝试使用我的协调器布局。但对于Modal BottomSheet，您必须使用android.support.design.R.id.design_bottom_sheet

Answer 2

您可以在setUpDialog方法中设置行为。

 @Override
        public void setupDialog(Dialog dialog, int style) {
            View contentView = View.inflate(getContext(), R.layout.custom_filter_bottom_sheet, null);
            dialog.setContentView(contentView);
            CoordinatorLayout.LayoutParams layoutParams =
                    (CoordinatorLayout.LayoutParams) ((View) contentView.getParent()).getLayoutParams();
            CoordinatorLayout.Behavior behavior = layoutParams.getBehavior();
            if (behavior != null && behavior instanceof BottomSheetBehavior) {
                ((BottomSheetBehavior) behavior).setBottomSheetCallback(mBottomSheetBehaviorCallback);
            }

        }

并定义回调

 private BottomSheetBehavior.BottomSheetCallback mBottomSheetBehaviorCallback = new BottomSheetBehavior.BottomSheetCallback() {
        @Override
        public void onStateChanged(@NonNull View bottomSheet, int newState) {
            if (newState == BottomSheetBehavior.STATE_HIDDEN) {
                dismiss();
            }
        }

        @Override
        public void onSlide(@NonNull View bottomSheet, float slideOffset) {
        }
    };

Answer 3

如果您对创建底页行为感兴趣，请按照以下步骤进行操作

您已在代码中设置了BottomSheetBehavior，如下面链接中所定义。

https://medium.com/@nullthemall/new-bottomsheet-caab21aff19b

来自Modal BottomSheetFragment的BottomSheetCallback

3 个答案: