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。