Android 学习笔记之ExpandableListView UI的简单用法

ExpandableListView是一个父子集的显示方式，

1、主界面

public class ExpListViewDome extends Activity {

    private ExpandableListView Exp_ListView;
    private String[] mGroups;
    private List<List<String>> mChilds;
    private ExpandableListAdapter adapter;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_explistviewdome);
        Exp_ListView = (ExpandableListView) this
                .findViewById(R.id.exp_ListView);
        mGroups = new String[2];
        mChilds = new ArrayList<List<String>>();
        getData();
        adapter = new ExpListView_Adapter(ExpListViewDome.this, mChilds,
                mGroups);
        Exp_ListView.setAdapter(adapter);
        
        //默认展开第一个父窗口
        Exp_ListView.expandGroup(0);

    }

    /**
     * 获取父窗口和子窗口的数据
     */
    public void getData() {

        mGroups[0] = "第一个老子";
        mGroups[1] = "第二个老子";

        mChilds = new ArrayList<List<String>>();
        List<String> list1 = new ArrayList<String>();
        list1.add("啦啦啦");
        list1.add("哈哈哈");
        list1.add("嘎嘎嘎");
        list1.add("呵呵呵");
        List<String> list2 = new ArrayList<String>();
        list2.add("巴巴巴");
        list2.add("恰恰恰");
        list2.add("呼呼呼");
        list2.add("哼哼哼");
        mChilds.add(list1);
        mChilds.add(list2);

    }

2、自定义适配器

public class ExpListView_Adapter extends BaseExpandableListAdapter {

    private Context mContext;
    private List<List<String>> mChilds;
    private String[] mGroups;

    public ExpListView_Adapter(Context context, List<List<String>> list,
            String[] Groups) {
        // TODO Auto-generated constructor stub]
        this.mContext = context;
        this.mChilds = list;
        this.mGroups = Groups;

    }

    @Override
    public Object getChild(int groupPosition, int childPosition) {
        // TODO Auto-generated method stub
        return mChilds.get(groupPosition).get(childPosition);
    }

    @Override
    public long getChildId(int groupPosition, int childPosition) {
        // TODO Auto-generated method stub
        return childPosition;
    }

    @Override
    public View getChildView(int groupPosition, int childPosition,
            boolean isLastChild, View convertView, ViewGroup parent) {
        // TODO Auto-generated method stub
        // 获取子窗口显示数据
        String str = mChilds.get(groupPosition).get(childPosition);
        // 设置数据显示样式
        TextView textView = new TextView(mContext);
        textView.setText(str);
        textView.setPadding(60, 0, 10, 10);
        textView.setGravity(Gravity.CENTER_VERTICAL);
        textView.setTextColor(Color.BLUE);
        textView.setTextSize(24);

        return textView;
    }

    @Override
    public int getChildrenCount(int groupPosition) {
        // TODO Auto-generated method stub
        return mChilds.get(groupPosition).size();
    }

    @Override
    public Object getGroup(int groupPosition) {
        // TODO Auto-generated method stub
        return mGroups[groupPosition];
    }

    @Override
    public int getGroupCount() {
        // TODO Auto-generated method stub
        return mGroups.length;
    }

    @Override
    public long getGroupId(int groupPosition) {
        // TODO Auto-generated method stub
        return groupPosition;
    }

    @Override
    public View getGroupView(int groupPosition, boolean isExpanded,
            View convertView, ViewGroup parent) {
        // TODO Auto-generated method stub
        // 获取父窗口显示数据
        String Title = mGroups[groupPosition];
        // 设置数据显示样式
        TextView textView = new TextView(mContext);
        textView.setText(Title);
        textView.setBackgroundColor(Color.GRAY);
        textView.setPadding(60, 0, 0, 0);
        textView.setTextColor(Color.BLUE);
        textView.setTextSize(30);

        return textView;
    }

    @Override
    public boolean hasStableIds() {
        // TODO Auto-generated method stub
        return false;
    }

    @Override
    public boolean isChildSelectable(int groupPosition, int childPosition) {
        // TODO Auto-generated method stub
        //true   为子窗口有点击事件
        return true;
    }