ListView 介绍

1. 通过继承Activity实现ListView

1.1 在XML布局文件中实现一个ListView

 

 <ListView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/listView"
        android:layout_below="@+id/textView"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true"
        android:layout_marginTop="42dp" />

1.2 在MainActivity中实现代码

 ListView listView = (ListView) findViewById(R.id.listView);
 String [] name = new String[]{"A","B","C","D","E","F","Aa","Ba","Ca","Da","Ea","Fa"};
 ArrayAdapter<String> arrayAdapter= new ArrayAdapter<String>(this,android.R.layout.simple_expandable_list_item_1,name);
 listView.setAdapter(arrayAdapter);

第一步：建立数据源

　　String [] name = new String[]{"A","B","C","D","E","F","Aa","Ba","Ca","Da","Ea","Fa"};

第二步：建立Adapter并且绑定数据源

　　ArrayAdapter<String> arrayAdapter= new ArrayAdapter<String>(this,android.R.layout.simple_expandable_list_item_1,name);

第三步：将Adapter绑定UI

 　  listView.setAdapter(arrayAdapter);

2. 通过继承ListViewActivity实现ListView

2.1 XML文件

不用指定Layout，如果一定要指定话，要将id设为android:id="@android:id/list"

<ListView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@android:id/list"
        android:layout_below="@+id/textView"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true"
        android:layout_marginTop="42dp" />

2.2 继承ListActivity

public class MainActivity extends ListActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        String [] name = new String[]{"A","B","C","D","E","F","Aa","Ba","Ca","Da","Ea","Fa"};
        ArrayAdapter<String> arrayAdapter= new ArrayAdapter<String>(this,android.R.layout.simple_expandable_list_item_1,name);     
        setListAdapter(arrayAdapter);
    }

如果设定XML文件，且指定id为android:id="@android:id/list"

可以用 ListView listView = getListView();来得到这个id为list的listView，然后就可以对这个listView进行操作了。