Android支持展开/收缩功能的列表控件

最近在做一个Rss阅读器，看了下别人做的阅读器中的列表控件可以展开、收缩，我就在网上搜索了一下。下面就我找到的一个小例子，给大家分享一下。

ActivityMain .java

package study.com.android;

import android.app.ExpandableListActivity;
import android.os.Bundle;
import android.view.ContextMenu;
import android.view.MenuItem;
import android.view.View;
import android.view.ContextMenu.ContextMenuInfo;
import android.widget.ExpandableListAdapter;
import android.widget.ExpandableListView;
import android.widget.TextView;
import android.widget.Toast;
import android.widget.ExpandableListView.ExpandableListContextMenuInfo;

public class ActivityMain extends ExpandableListActivity {

    private ExpandableListAdapter mAdapter;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        this.setTitle("ExpandableList");
        mAdapter = new MyExpandableListAdapter(this);
        setListAdapter(mAdapter);
        registerForContextMenu(this.getExpandableListView());
    }

    // 为列表的每一项创建上下文菜单（即长按后呼出的菜单）
    @Override
    public void onCreateContextMenu(ContextMenu menu, View v,
            ContextMenuInfo menuInfo) {
        menu.setHeaderTitle("ContexMenu");
        menu.add(0, 0, 0, "ContextMenu");
    }

    // 单击上下文菜单后的逻辑
    @Override
    public boolean onContextItemSelected(MenuItem item) {

        ExpandableListContextMenuInfo info = (ExpandableListContextMenuInfo) item
                .getMenuInfo();
        String title = ((TextView) info.targetView).getText().toString();

        int type = ExpandableListView
                .getPackedPositionType(info.packedPosition);
        if (type == ExpandableListView.PACKED_POSITION_TYPE_CHILD) {

            int groupPos = ExpandableListView
                    .getPackedPositionGroup(info.packedPosition);
            int childPos = ExpandableListView
                    .getPackedPositionChild(info.packedPosition);
            Toast.makeText(
                    this,
                    title + "-Group Index" + groupPos + "Child Index:"
                            + childPos, Toast.LENGTH_SHORT).show();
            return true;
        }
        return false;
    }
}

MyExpandableListAdapter.java

ckage study.com.android;

import android.content.Context;
import android.view.Gravity;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AbsListView;
import android.widget.BaseExpandableListAdapter;
import android.widget.TextView;

public class MyExpandableListAdapter extends BaseExpandableListAdapter {

    private Context mContext;

    // 父列表数据
    private String[] groups = { "group1", "group2", "group3", "group4", ""};

    // 子列表数据
    private String[][] children = { { "child1" }, { "child1", "child2" },
            { "child1", "child2", "child3" },
            { "child1", "child2", "child3", "child4" }, };

    MyExpandableListAdapter(Context context) {
        mContext = context;
    }

    @Override
    public Object getChild(int groupPosition, int childPosition) {
        // TODO Auto-generated method stub
        return children[groupPosition][childPosition];
    }

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

    // 取子列表中的某一项的view
    @Override
    public View getChildView(int groupPosition, int childPosition,
            boolean isLastChild, View convertView, ViewGroup parent) {
        TextView textView = getGenericView();
        ;
        textView.setText(getChild(groupPosition, childPosition).toString());
        return textView;
    }

    @Override
    public int getChildrenCount(int groupPosition) {
        // TODO Auto-generated method stub
        return children[groupPosition].length;
    }

    @Override
    public Object getGroup(int groupPosition) {
        return groups[groupPosition];
    }

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

    @Override
    public long getGroupId(int groupPosition) {
        // TODO A

补充：移动开发 , Android ,