java - 创建 ListView 时出现运行时错误

Question

我在创建 ListView 时遇到此错误。

<小时/>

<ListView
    android:id="@+id/list_view"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"

    android:layout_alignParentTop="true"
    android:layout_centerHorizontal="true" />

<小时/>

MainActivity.java

public class MainActivity extends ListActivity {

    ListView l;
    String[] names = {"aaa","bbb","ccc"};


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        l = (ListView)findViewById(R.id.list_view);
        ArrayAdapter ad = new ArrayAdapter(this,android.R.layout.activity_list_item,names);
        l.setAdapter(ad);

    }
}

Answer 1

只需注释掉这部分代码即可:

setContentView(R.layout.activity_main);

然后替换:

l = (ListView)findViewById(R.id.list_view);
ArrayAdapter ad = new ArrayAdapter(this,android.R.layout.activity_list_item,names);
l.setAdapter(ad);

与:

​setListAdapter(new ArrayAdapter<String>(this,​​​​​​​​​​​​android.R.layout.simple_list_item_1, names));

或者您可以保留代码并将 ListActivity 更改为 Activity