如何在BottomSheetDialogFragment中设置最大高度？

Question

我有一个BottomSheetDialogFragment，我需要在这个对话框中设置我的高度。我需要，当用户点击按钮时，对话框会出现并填满屏幕的 85%。这该怎么做？

Answer 1

BottomSheetDialogFragment：

override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
    super.onViewCreated(view, savedInstanceState)

    val offsetFromTop = 200
    (dialog as? BottomSheetDialog)?.behavior?.apply {
        isFitToContents = false
        setExpandedOffset(offsetFromTop)
        state = BottomSheetBehavior.STATE_EXPANDED
    }
}

Answer 2

您可以执行以下操作：

public class MyBottomSheetDialog extends BottomSheetDialogFragment {

   //....

   @NonNull @Override public Dialog onCreateDialog(Bundle savedInstanceState) {
    Dialog dialog = super.onCreateDialog(savedInstanceState);
    dialog.setOnShowListener(new DialogInterface.OnShowListener() {
      @Override public void onShow(DialogInterface dialogInterface) {
        BottomSheetDialog bottomSheetDialog = (BottomSheetDialog) dialogInterface;
        setupRatio(bottomSheetDialog);
      }
    });
    return  dialog;
  }

  private void setupRatio(BottomSheetDialog bottomSheetDialog) {
    //id = com.google.android.material.R.id.design_bottom_sheet for Material Components
    //id = android.support.design.R.id.design_bottom_sheet for support librares
    FrameLayout bottomSheet = (FrameLayout) 
        bottomSheetDialog.findViewById(R.id.design_bottom_sheet);
    BottomSheetBehavior behavior = BottomSheetBehavior.from(bottomSheet);
    ViewGroup.LayoutParams layoutParams = bottomSheet.getLayoutParams();
    layoutParams.height = getBottomSheetDialogDefaultHeight();
    bottomSheet.setLayoutParams(layoutParams);
    behavior.setState(BottomSheetBehavior.STATE_EXPANDED);
  }
  private int getBottomSheetDialogDefaultHeight() {
    return getWindowHeight() * 85 / 100;
  }
  private int getWindowHeight() {
    // Calculate window height for fullscreen use
    DisplayMetrics displayMetrics = new DisplayMetrics();
    ((Activity) getContext()).getWindowManager().getDefaultDisplay().getMetrics(displayMetrics);
    return displayMetrics.heightPixels;
  }

}

Answer 3

始终展开到完整高度可以在BottomSheetDialogFragment()的onCreateDialog中设置

    override fun onCreateDialog(savedInstanceState: Bundle?): Dialog {
    val dialog = BottomSheetDialog(requireContext(), theme)
    dialog.behavior.state = BottomSheetBehavior.STATE_EXPANDED
    dialog.behavior.skipCollapsed = true
    return dialog
}

最大高度可以在onCreateView中设置

    override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?,
        savedInstanceState: Bundle?
    ): View? {
        val view = inflater.inflate(R.layout.bottom_sheet_dialog, container, false)
        // Set max height to half screen
        view.findViewById<ConstraintLayout>
(R.id.root_layout_of_bottom_sheet).maxHeight =
            (resources.displayMetrics.heightPixels * 0.5).toInt()
        return view
    }