java - 在适配器参数android java中声明isimple_list_item_1

Question

在我adapter用于填充ListView控件的 android 应用程序中，如下所示：

public class ChildActivity extends ActionBarActivity implements GetChildList {

    private ListView lv_child;
    @Override
    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_child);

        List<String> array = new ArrayList<String>();   // for e.g array ["num1", "num2"]
        lv_child = (ListView)findViewById(R.id.lv_child); 
        ArrayAdapter<String> adapterChild = new ArrayAdapter<String>(ChildActivity.this,  android.R.layout.simple_list_item_1,array);
        lv_child.setAdapter(adapterChild);

}
}

但我不明白它simple_list_item_1在这一行声明的位置ArrayAdapter<String> adapterChild = new ArrayAdapter<String>(ChildActivity.this, android.R.layout.simple_list_item_1,array);

请给我建议，等待回复。