Android程序:简单的ArrayAdapter实现

public class MainActivity extends Activity {    private ListView listView;    private ArrayAdapter<String>arr_adapter;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        listView=(ListView) findViewById(R.id.listview);        //数据源        String[] arr_data={"chris1","chris2","chris3","chris4","chris5"};        //新建适配器并添加数据源到适配器        //arr_adapter=new ArrayAdapter（上下文《this》，当前ListView加载的每一个列表项对应的布局文件《simple_list_item1》，数据源《数组等》）        arr_adapter=new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1,arr_data);        //视图加载适配器        listView.setAdapter(arr_adapter);    }}