android学习笔记22：可展开的ListView

有时在写程序时，我们希望一个listview能展开其下的子类目，在android中可以通过使用ExpandAbleListView来实现，只需要在代码里为ExpandAbleListView设置一个ExpandAbleLIstAdapter的数据源即可。

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >
<ExpandableListView
    android:id="@+id/list"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:childIndicator="@drawable/icon"
    ></ExpandableListView>
</LinearLayout>
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<ExpandableListView
android:id="@+id/list"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:childIndicator="@drawable/icon"
></ExpandableListView>
</LinearLayout>

public class ExpandableListViewTest extends Activity
{
    @Override
    public void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        //创建一个BaseExpandableListAdapter对象
        ExpandableListAdapter adapter = new BaseExpandableListAdapter()
        {
            int[] logos = new int[]
            {
                R.drawable.sunyz_1,
                R.drawable.sunyz_6,
                R.drawable.sunyz_7
            };
            private String[] CDs = new String[]
                { "风筝", "完美的一天", "是时候"};
            private String[][] songs = new String[][]
            {
                { "绿光", "不是真的爱我", "爱情字典", "练习" },
                { "Honey Honey", "心愿", "明天晴天", "隐形人" },
                { "愚人的国度", "是时候" , "世说心语" }
            };
            //获取指定组位置、指定子列表项处的子列表项数据
            @Override
            public Object getChild(int groupPosition, int childPosition)
            {
                return songs[groupPosition][childPosition];
            }
            @Override
            public long getChildId(int groupPosition, int childPosition)
            {
                return childPosition;
            }
            @Override
            public int getChildrenCount(int groupPosition)
            {
                return songs[groupPosition].length;
            }
            private TextView getTextView()
            {
                //用于实现条目的虚拟列表的基类. 这里的列表没有空间的定义。例如，该类的子类可以以网格的形式、走马灯的形式显示，或者作为堆栈等等
                AbsListView.LayoutParams lp = new AbsListView.LayoutParams(
                        ViewGroup.LayoutParams.FILL_PARENT, 64); //设置宽和高
                TextView textView = new TextView(ExpandableListViewTest.this);
                textView.setLayoutParams(lp);
                textView.setGravity(Gravity.CENTER_VERTICAL | Gravity.LEFT);
                textView.setPadding(36, 0, 0, 0);
                textView.setTextSize(20);
                return textView;
            }
            //该方法决定每个子选项的外观
            @Override
  &nbs

补充：移动开发 , Android ,