ExpandableListView控件的使用

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类似QQ手机，点击一个选项展现一个列表。Android中控件ExpandableListView可实现类似于此功能。

主界面布局文件:

<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:background="#fff" >    <ExpandableListView        android:id="@+id/id_expandablelv"        android:layout_width="match_parent"        android:layout_height="wrap_content" /></RelativeLayout>

类似于ListView控件，直接获取该控件id，设置其适配器即可。

package com.example.expandablelistviewdemo;import android.app.Activity;import android.os.Bundle;import android.widget.ExpandableListView;public class MainActivity extends Activity {private ExpandableListView mExpandableListView;private ExpandableAdapter mExpandableAdapter;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);mExpandableListView = (ExpandableListView) findViewById(R.id.id_expandablelv);mExpandableAdapter = new ExpandableAdapter(this);mExpandableListView.setAdapter(mExpandableAdapter);}}

适配器文件:

package com.example.expandablelistviewdemo;import android.content.Context;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.BaseExpandableListAdapter;import android.widget.ImageView;import android.widget.TextView;public class ExpandableAdapter extends BaseExpandableListAdapter {int[] logos = new int[]{            R.drawable.word,            R.drawable.excel,            R.drawable.email,            R.drawable.ppt    };    private String[] armTypes = new String[]{            "WORD", "EXCEL", "EMAIL", "PPT"    };    private String[][] arms = new String[][]{            {"文档编辑", "文档排版", "文档处理", "文档打印"},            {"表格编辑", "表格排版", "表格处理", "表格打印"},            {"收发邮件", "管理邮箱", "登录登出", "注册绑定"},            {"演示编辑", "演示排版", "演示处理", "演示打印"},    };        LayoutInflater mLayoutInflater;        public ExpandableAdapter(Context mContext) {mLayoutInflater = LayoutInflater.from(mContext);}    @Overridepublic int getGroupCount() {//返回类别长度return armTypes.length;}@Overridepublic int getChildrenCount(int groupPosition) {return arms[groupPosition].length;}@Overridepublic Object getGroup(int groupPosition) {return armTypes[groupPosition];}@Overridepublic Object getChild(int groupPosition, int childPosition) {return arms[groupPosition][childPosition];}@Overridepublic long getGroupId(int groupPosition) {return groupPosition;}@Overridepublic long getChildId(int groupPosition, int childPosition) {return childPosition;}@Overridepublic boolean hasStableIds() {return true;}@Overridepublic View getGroupView(int groupPosition, boolean isExpanded,View convertView, ViewGroup parent) {convertView = mLayoutInflater.inflate(R.layout.item_group, null);ImageView logo = (ImageView) convertView.findViewById(R.id.id_group_logo);logo.setImageResource(logos[groupPosition]);TextView text = (TextView) convertView.findViewById(R.id.id_group_tv);text.setText(getGroup(groupPosition).toString());return convertView;}@Overridepublic View getChildView(int groupPosition, int childPosition,boolean isLastChild, View convertView, ViewGroup parent) {convertView = mLayoutInflater.inflate(R.layout.item_sub, null);TextView tv = (TextView) convertView.findViewById(R.id.id_sub_tv);tv.setText(getChild(groupPosition, childPosition).toString());        return convertView;}@Overridepublic boolean isChildSelectable(int groupPosition, int childPosition) {return true;}}

自定义的group的xml文件

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="50dp"    android:orientation="horizontal" >        <ImageView         android:id="@+id/id_group_logo"        android:layout_width="20dp"        android:layout_height="20dp"        android:layout_marginLeft="30dp"        android:layout_gravity="center_vertical"        />        <TextView         android:id="@+id/id_group_tv"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_gravity="center_vertical"        android:gravity="center_vertical"        android:paddingLeft="5dp"        /></LinearLayout>

自定义每个列表选项布局文件

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="45dp"    android:orientation="vertical" >        <TextView         android:id="@+id/id_sub_tv"        android:layout_width="wrap_content"        android:layout_height="30dp"        android:layout_gravity="center_horizontal|left"        android:gravity="center_vertical|left"        android:layout_marginLeft="30dp"        android:textSize="20sp"        /></LinearLayout>

使用还是挺简单的。

源码下载:

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