适配器 1、ArrayAdapter 2.SimpleAdapter

public class MainActivity extends AppCompatActivity  {
    private ListView lv;
    private ArrayAdapter<String> arr_adapter;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        lv = (ListView)findViewById(R.id.listView);
        String[] array_data = {"礼拜一","礼拜二","礼拜三","礼拜四","礼拜五"};

        //1.新建一个适配器
        //Arraydapter(上下文，每一个加载列表项对应的布局文件，数据源,)
        //  2.适配器加载数据源
        arr_adapter = new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1,array_data);　　//安卓自带的布局文件 注意要先android.R.
        //3.视图Listview加载适配器
        lv.setAdapter(arr_adapter);
    }
}