还是先来看看是不是你想要的效果：
不废话，直接上代码，很简单，代码里都有注释
1 单选
public class SingleActivity extends AppCompatActivity {
private ListView listView;
private ArrayList<String> groups;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activi
