Android BottomSheetDialogFragment实现固定高度

public class AreaSelectBottomSheetDialogFragment extends BottomSheetDialogFragment {
    private BottomSheetBehavior mBottomSheetBehavior;

    private final BottomSheetBehavior.BottomSheetCallback mBottomSheetBehaviorCallback = new BottomSheetBehavior.BottomSheetCallback() {
        @Override
        public void onStateChanged(@NonNull View bottomSheet, int newState) {
            //禁止拖拽，
            if (newState == BottomSheetBehavior.STATE_DRAGGING) {
                //设置为收缩状态
                mBottomSheetBehavior.setState(BottomSheetBehavior.STATE_COLLAPSED);
            }
        }
        @Override
        public void onSlide(@NonNull View bottomSheet, float slideOffset) {
        }
    };

    @Override
    public void onStart() {
        super.onStart();
        Dialog dialog = getDialog();
        mBottomSheetBehavior = BottomSheetBehavior.from(getDialog().findViewById(R.id.design_bottom_sheet));
        if (dialog != null) {
            View bottomSheet = dialog.findViewById(R.id.design_bottom_sheet);
            bottomSheet.getLayoutParams().height = ViewGroup.LayoutParams.MATCH_PARENT;
        }
        final View view = getView();
        view.post(new Runnable() {
            @Override
            public void run() {
                View parent = (View) view.getParent();
                CoordinatorLayout.LayoutParams params = (CoordinatorLayout.LayoutParams) (parent).getLayoutParams();
                CoordinatorLayout.Behavior behavior = params.getBehavior();
                mBottomSheetBehavior = (BottomSheetBehavior) behavior;
                mBottomSheetBehavior.setBottomSheetCallback(mBottomSheetBehaviorCallback);
                Display display = getActivity().getWindowManager().getDefaultDisplay();
                //设置高度
                int height = display.getHeight()  / 2;
                mBottomSheetBehavior.setPeekHeight(height);
                parent.setBackgroundColor(Color.WHITE);
            }
        });
    }

    @Nullable
    @Override
    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        super.onCreateView(inflater, container, savedInstanceState);
        View view = inflater.inflate(R.layout.dialog_fragment_bottom_sheet_area_select, container, false);
        init(view);
        return view;
    }

    private void init(View view) {
        Display display = getActivity().getWindowManager().getDefaultDisplay();
        //设置高度
        int height = display.getHeight()  / 2;
        view.setLayoutParams(new LinearLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, height));
    }
}

代码实现loadingDialog

AlertDialog.Builder builder = new AlertDialog.Builder(this);
            ProgressBar progressBar = new ProgressBar(this);
            FrameLayout.LayoutParams layoutParams = new FrameLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT);
            layoutParams.setMargins(0,26,0,26);
            FrameLayout frameLayout = new FrameLayout(this);
            frameLayout.addView(progressBar);
            frameLayout.setLayoutParams(layoutParams);
            frameLayout.setPadding(0, 46, 0, 46);
            builder.setView(frameLayout);
            alertDialog = builder.create();
            alertDialog.setCancelable(false);
            alertDialog.show();