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;
    }
       
   }

    
}