分组的listview——ExpandableListView

开发使用到的数据统计时可以用分组的ExpandablelistView

效果：

第一步.layout中定义ExpandablelistView,和定义普通的listview一样

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"

    xmlns:tools="http://schemas.android.com/tools"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    android:paddingBottom="@dimen/activity_vertical_margin"

    android:paddingLeft="@dimen/activity_horizontal_margin"

    android:paddingRight="@dimen/activity_horizontal_margin"

    android:paddingTop="@dimen/activity_vertical_margin"

    tools:context="com.example.myexpandablelistview.MainActivity" >

    <ExpandableListView

        android:id="@+id/mylistview"

        android:layout_width="match_parent"

        android:layout_height="match_parent" >

    </ExpandableListView>

</RelativeLayout>

第二步，设置组和子的数据源

第三步，自定义myadapter继承BaseExpandableListAdapter，复写方法

第四部，给listview设置adapter

package com.example.myexpandablelistview;

import android.app.Activity;

import android.graphics.Color;

import android.os.Bundle;

import android.view.Menu;

import android.view.MenuItem;

import android.view.View;

import android.view.ViewGroup;

import android.widget.BaseExpandableListAdapter;

import android.widget.ExpandableListView;

import android.widget.TextView;

public class MainActivity extends Activity {

    private ExpandableListView mylistview;

    //组视图数据

    String[] parents={"三国人物","水浒人物","西游人物"};

    //子视图数据

    String[][] children={

            {"曹操","孙权","刘备"},{"宋江","吴用","高俅","林冲"},{"孙悟空","红孩儿","哪吒"}

    };

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

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

        mylistview.setAdapter(new Myadapter());

    }

    //自定义adapter

   class Myadapter extends BaseExpandableListAdapter{

    @Override

    //组数

    public int getGroupCount() {

        return parents.length;

    }

    @Override

    //每组的子数

    public int getChildrenCount(int groupPosition) {

        return children[groupPosition].length;

    }

    @Override

    //返回对应的组

    public Object getGroup(int groupPosition) {

        return parents[groupPosition];

    }

    @Override

    //返回对应的子

    public Object getChild(int groupPosition, int childPosition) {

        return children[groupPosition][childPosition];

    }

    @Override

    //返回组id

    public long getGroupId(int groupPosition) {

        return groupPosition;

    }

    @Override

    //返回子id

    public long getChildId(int groupPosition, int childPosition) {

        return childPosition;

    }

    @Override

    public boolean hasStableIds() {

        return true;

    }

    @Override

    //返回组试图

    public View getGroupView(int groupPosition, boolean isExpanded,

            View convertView, ViewGroup parent) {

        TextView view;

        if(convertView!=null){

            view=(TextView) convertView;

        }

        else{

            view =new TextView(MainActivity.this);

        }

        view.setText(parents[groupPosition]);

        view.setBackgroundColor(Color.RED);

        return view;

    }

    @Override

    //返回子试图

    public View getChildView(int groupPosition, int childPosition,

            boolean isLastChild, View convertView, ViewGroup parent) {

        TextView view;

        if(convertView!=null){

            view=(TextView) convertView;

        }

        else{

            view =new TextView(MainActivity.this);

        }

        view.setText(children[groupPosition][childPosition]);

        return view;

    }

    @Override

    public boolean isChildSelectable(int groupPosition, int childPosition) {

        return true;

    }

   }

}