android ExpandableListView简单例子

android中常常要用到ListView，有时也要用到ExpandableListView，如在手机设置中，对于分类有很好的效果，会用ListView的人一定会用ExpandableListView，因为
ExpandableListView extends ListView的，下面来看个简单的例子

运行效果图：

android ExpandableListView简单例子

<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"    tools:context=".MainActivity" >    <ExpandableListView        android:id="@+id/expendlist"        android:layout_width="match_parent"        android:layout_height="wrap_content" >    </ExpandableListView> </RelativeLayout>

 //扩展ListView的头List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="wrap_content"  android:orientation="horizontal" >  <TextView   android:id="@+id/txt"   android:layout_width="wrap_content"   android:layout_height="wrap_content" />  <ImageView   android:id="@+id/img"   android:layout_width="wrap_content"   android:layout_height="wrap_content" /> </LinearLayout>

 //扩展ListView的子List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="match_parent"  android:orientation="horizontal"  android:padding="10.0dp" >  <ImageView   android:id="@+id/img"   android:layout_width="20.0dp"   android:layout_height="20.0dp" />  <TextView   android:id="@+id/txt"   android:layout_width="wrap_content"   android:layout_height="wrap_content" /> </LinearLayout>

package com.example.test; import java.util.ArrayList; import java.util.List; import android.app.Activity; import android.content.Context; import android.os.Bundle; import android.view.View; import android.view.ViewGroup; import android.widget.BaseExpandableListAdapter; import android.widget.ExpandableListView; import android.widget.ImageView; import android.widget.TextView; public class MainActivity extends Activity { private ExpandableListView expandableListView; private List<String> group_list; private List<List<String>> item_list; private List<List<Integer>> item_list2; @Override protected void onCreate(Bundle savedInstanceState) {  super.onCreate(savedInstanceState);  setContentView(R.layout.activity_main);  //随便一堆测试数据  group_list = new ArrayList<String>();  group_list.add("A");  group_list.add("B");  group_list.add("C");  item_list = new ArrayList<List<String>>();  item_list.add(group_list);  item_list.add(group_list);  item_list.add(group_list);  List<Integer> tmp_list = new ArrayList<Integer>();  tmp_list.add(R.drawable.ic_launcher);  tmp_list.add(R.drawable.ic_launcher);  tmp_list.add(R.drawable.ic_launcher);  item_list2 = new ArrayList<List<Integer>>();  item_list2.add(tmp_list);  item_list2.add(tmp_list);  item_list2.add(tmp_list);  expandableListView = (ExpandableListView) findViewById(R.id.expendlist);  expandableListView.setAdapter(new MyExpandableListViewAdapter(this)); } //用过ListView的人一定很熟悉，只不过这里是BaseExpandableListAdapter class MyExpandableListViewAdapter extends BaseExpandableListAdapter {  private Context context;  public MyExpandableListViewAdapter(Context context) {   this.context = context;  }  @Override  public int getGroupCount() {   return group_list.size();  }  @Override  public int getChildrenCount(int groupPosition) {   return item_list.get(groupPosition).size();  }  @Override  public Object getGroup(int groupPosition) {   return group_list.get(groupPosition);  }  @Override  public Object getChild(int groupPosition, int childPosition) {   return item_list.get(groupPosition).get(childPosition);  }  @Override  public long getGroupId(int groupPosition) {   return groupPosition;  }  @Override  public long getChildId(int groupPosition, int childPosition) {   return childPosition;  }  @Override  public boolean hasStableIds() {   return true;  }  @Override  public View getGroupView(int groupPosition, boolean isExpanded,    View convertView, ViewGroup parent) {   GroupHolder groupHolder = null;   if (convertView == null) {    convertView = (View) getLayoutInflater().from(context).inflate(      R.layout.expendlist_group, null);    groupHolder = new GroupHolder();    groupHolder.txt = (TextView) convertView.findViewById(R.id.txt);    // groupHolder.img = (ImageView) convertView    // .findViewById(R.id.img);    convertView.setTag(groupHolder);   } else {    groupHolder = (GroupHolder) convertView.getTag();   }   groupHolder.txt.setText(group_list.get(groupPosition));   return convertView;  }  @Override  public View getChildView(int groupPosition, int childPosition,    boolean isLastChild, View convertView, ViewGroup parent) {   ItemHolder itemHolder = null;   if (convertView == null) {    convertView = (View) getLayoutInflater().from(context).inflate(      R.layout.expendlist_item, null);    itemHolder = new ItemHolder();    itemHolder.txt = (TextView) convertView.findViewById(R.id.txt);    itemHolder.img = (ImageView) convertView.findViewById(R.id.img);    convertView.setTag(itemHolder);   } else {    itemHolder = (ItemHolder) convertView.getTag();   }   itemHolder.txt.setText(item_list.get(groupPosition).get(     childPosition));   itemHolder.img.setBackgroundResource(item_list2.get(groupPosition).get(     childPosition));   return convertView;  }  @Override  public boolean isChildSelectable(int groupPosition, int childPosition) {   return true;  } } class GroupHolder {  public TextView txt;  public ImageView img; } class ItemHolder {  public ImageView img;  public TextView txt; }}

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