09 ExpanableListView 的代码例子

<span style="font-size:18px;">package com.qf.day09_expandablelistview03;

import android.app.Activity;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseExpandableListAdapter;
import android.widget.ExpandableListView;
import android.widget.ExpandableListView.OnChildClickListener;
import android.widget.ExpandableListView.OnGroupClickListener;
import android.widget.ExpandableListView.OnGroupCollapseListener;
import android.widget.ExpandableListView.OnGroupExpandListener;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends Activity {

    private ExpandableListView expandableListView;

    private String[] groupData = {"朋友","同学","同事"};

    private String[][] childData ={{"马云","王健林","马化腾"},{"老马","老王","小马"},{"许中","光头","翠"}};

    private MyAdapter adapter;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        expandableListView = (ExpandableListView) findViewById(R.id.expandableListView);

        adapter = new MyAdapter();

        expandableListView.setAdapter(adapter);

        //分组的点击事件
        expandableListView.setOnGroupClickListener(new OnGroupClickListener() {

            @Override
            public boolean onGroupClick(ExpandableListView parent, View v,
                    int groupPosition, long id) {

                Toast.makeText(MainActivity.this, "==onGroupClick==", Toast.LENGTH_SHORT).show();

                return false;
            }
        });

        //子元素的点击事件
        expandableListView.setOnChildClickListener(new OnChildClickListener() {

            @Override
            public boolean onChildClick(ExpandableListView parent, View v,
                    int groupPosition, int childPosition, long id) {
                // TODO Auto-generated method stub
                Toast.makeText(MainActivity.this, "==onChildClick=="+childData[groupPosition][childPosition], Toast.LENGTH_SHORT).show();
                return false;
            }
        });

        //分组展开的监听
        expandableListView.setOnGroupExpandListener(new OnGroupExpandListener() {

            @Override
            public void onGroupExpand(int groupPosition) {
                // TODO Auto-generated method stub
                Toast.makeText(MainActivity.this, "==onGroupExpand==", Toast.LENGTH_SHORT).show();
            }
        });
        //分组折叠的监听
        expandableListView.setOnGroupCollapseListener(new OnGroupCollapseListener() {

            @Override
            public void onGroupCollapse(int groupPosition) {
                // TODO Auto-generated method stub
                Toast.makeText(MainActivity.this, "==onGroupCollapse==", Toast.LENGTH_SHORT).show();
            }
        });

    }

    public class MyAdapter extends BaseExpandableListAdapter{

        /**
         * 获取分组的个数
         */
        @Override
        public int getGroupCount() {
            // TODO Auto-generated method stub
            return groupData.length;
        }

        /**
         * 获取当前下标分组里的子元素的个数
         */
        @Override
        public int getChildrenCount(int groupPosition) {
            // TODO Auto-generated method stub
            return childData[groupPosition].length;
        }

        /**
         * 获取当前下标分组的数据
         */
        @Override
        public Object getGroup(int groupPosition) {
            // TODO Auto-generated method stub
            return groupData[groupPosition];
        }

        /**
         * 获取分组下标为groupPosition里子元素的下标为childPosition的数据
         */
        @Override
        public Object getChild(int groupPosition, int childPosition) {
            // TODO Auto-generated method stub
            return childData[groupPosition][childPosition];
        }

        /**
         * 获取下标为groupPosition分组的id
         */
        @Override
        public long getGroupId(int groupPosition) {
            // TODO Auto-generated method stub
            return groupPosition;
        }

        /**
         * 获取分组下标为groupPosition 里的子元素下标为childPosition元素的id
         */
        @Override
        public long getChildId(int groupPosition, int childPosition) {
            // TODO Auto-generated method stub
            return childPosition;
        }

        /**
         * 底层设计
         * 分组和子元素是否有稳定的id   底层的数据改变不会影响他们
         */
        @Override
        public boolean hasStableIds() {
            // TODO Auto-generated method stub
            return false;
        }

        /**
         * 分组的视图对象
         * 参数1:分组的位置下标
         * 参数2:当前分组是否展开
         * 参数3:复用的视图
         * 参数4:指明父控件 ExpandableListView
         */
        @Override
        public View getGroupView(int groupPosition, boolean isExpanded,
                View convertView, ViewGroup parent) {
            // TODO Auto-generated method stub
            View view = LayoutInflater.from(MainActivity.this)
                    .inflate(R.layout.item_group, parent,false);
            TextView tv = (TextView) view.findViewById(R.id.tv_item_group);
            tv.setText(groupData[groupPosition]);

            return view;
        }

        /**
         * 子元素的视图
         *
         * 参数1:当前分组的下标
         * 参数2:当前子元素的下标
         * 参数3:是否是最后一个子元素视图
         * 参数4:子元素复用视图
         * 参数5:指明父控件 ExpandableListView
         */
        @Override
        public View getChildView(int groupPosition, int childPosition,
                boolean isLastChild, View convertView, ViewGroup parent) {
            // TODO Auto-generated method stub

            View view = LayoutInflater.from(MainActivity.this)
                    .inflate(R.layout.item_child, parent,false);
            TextView tv = (TextView) view.findViewById(R.id.tv_item_child);
            tv.setText(childData[groupPosition][childPosition]);

            return view;
        }

        /**
         * 子元素能否被点击  false不能被点击   true可以被点击
         */
        @Override
        public boolean isChildSelectable(int groupPosition, int childPosition) {
            // TODO Auto-generated method stub
            return true;
        }

    }

}

</span>