如何在Android中实现侧表对话框

public class SideDialogFragment extends DialogFragment {
    private View rootView;

    @Nullable
    @Override
    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        rootView = inflater.inflate(R.layout.dialog_side, container, false);
        rootView.setOnTouchListener(new View.OnTouchListener() {
            private float startX;

            @Override
            public boolean onTouch(View v, MotionEvent event) {
                switch (event.getAction()) {
                    case MotionEvent.ACTION_DOWN:
                        startX = event.getX();
                        break;
                    case MotionEvent.ACTION_MOVE:
                        float distanceX = event.getX() - startX;
                        rootView.setTranslationX(distanceX);
                        break;
                    case MotionEvent.ACTION_UP:
                        if (event.getX() - startX > rootView.getWidth() / 2) {
                            dismiss();
                        } else {
                            rootView.setTranslationX(0);
                        }
                        break;
                }
                return true;
            }
        });
        return rootView;
    }

    @Override
    public void onStart() {
        super.onStart();
        Dialog dialog = getDialog();
        if (dialog != null) {
            dialog.getWindow().setLayout(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT);
        }
    }
}

SideDialogFragment dialogFragment = new SideDialogFragment();
dialogFragment.show(getSupportFragmentManager(), "SideDialog");