如何在gridview项目上设置焦点？

<GridView
    android:id="@+id/gridView"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:numColumns="3"
    android:focusable="true"
    android:choiceMode="singleChoice" />

GridView gridView = findViewById(R.id.gridView);
gridView.setAdapter(adapter);
gridView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
    @Override
    public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
        // 设置被点击的项目为焦点
        gridView.setSelection(position);
    }
});