当我在安卓DrawerLayout外部触摸时，如何关闭它？

DrawerLayout drawerLayout = findViewById(R.id.drawer_layout);
drawerLayout.setDrawerLockMode(DrawerLayout.LOCK_MODE_LOCKED_CLOSED);

View parentView = findViewById(R.id.parent_view);
parentView.setOnTouchListener(new View.OnTouchListener() {
    @Override
    public boolean onTouch(View v, MotionEvent event) {
        if (event.getAction() == MotionEvent.ACTION_DOWN && drawerLayout.isDrawerOpen(GravityCompat.START)) {
            drawerLayout.closeDrawer(GravityCompat.START);
            return true;
        }
        return false;
    }
});