关于ExpandableListView的一个小例子

喜欢显示好友QQ那样的列表，可以展开，可以收起，在android中，以往用的比较多的是listview，虽然可以实现列表的展示，但在某些情况下，我们还是希望用到可以分组并实现收缩的列表，那就要用到android的ExpandableListView，今天研究了一下这个的用法，也参考了很多资料动手写了一个小demo，实现了基本的功能，但界面优化方面做得还不够好，有待改进，素材采用了Q版三国杀武将的图片，很有爱哈哈，下面直接上效果图以及源代码~！

main.xml的布局很简单啦，只是一个ExpandableListView 就OK了

但值得简单说下的是android:cacheColorHint="#00000000"，这个设置可以去除拖动view时背景变成黑色的效果

android:listSelector="#00000000" ，可以去除选中时的黄色底色

1<?xmlversion="1.0"encoding="utf-8"?>
2<LinearLayoutxmlns:android="http://schemas.android.com/apk/res/android"
3android:layout_width="fill_parent"
4android:layout_height="fill_parent"
5android:orientation="vertical">
6<ExpandableListView
7android:id="@+id/list"
8android:layout_width="fill_parent"
9android:layout_height="fill_parent"
10android:background="#ffffff"
11android:cacheColorHint="#00000000"
12android:listSelector="#00000000"
13>
14 </ExpandableListView>
15</LinearLayout>
16

java代码：

packagecom.eyu.activity_test;

importandroid.app.Activity;
importandroid.graphics.Color;
importandroid.os.Bundle;
importandroid.view.Gravity;
importandroid.view.View;
importandroid.view.ViewGroup;
importandroid.view.Window;
importandroid.widget.AbsListView;
importandroid.widget.BaseExpandableListAdapter;
importandroid.widget.ExpandableListAdapter;
importandroid.widget.ExpandableListView;
importandroid.widget.ExpandableListView.OnChildClickListener;
importandroid.widget.ImageView;
importandroid.widget.LinearLayout;
importandroid.widget.TextView;
importandroid.widget.Toast;

publicclassExpandableListextendsActivity{

protectedvoidonCreate(BundlesavedInstanceState){
//TODOAuto-generatedmethodstub
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.main);

finalExpandableListAdapteradapter=newBaseExpandableListAdapter(){
//设置组视图的图片
int[]logos=newint[]{R.drawable.wei,R.drawable.shu,R.drawable.wu};
//设置组视图的显示文字
privateString[]generalsTypes=newString[]{"魏","蜀","吴"};
//子视图显示文字
privateString[][]generals=newString[][]{
{"夏侯惇","甄姬","许褚","郭嘉","司马懿","杨修"},
{"马超","张飞","刘备","诸葛亮","黄月英","赵云"},
{"吕蒙","陆逊","孙权","周瑜","孙尚香"}

};
//子视图图片
publicint[][]generallogos=newint[][]{
{R.drawable.xiahoudun,R.drawable.zhenji,
R.drawable.xuchu,R.drawable.guojia,
R.drawable.simayi,R.drawable.yangxiu},
{R.drawable.machao,R.drawable.zhangfei,
R.drawable.liubei,R.drawable.zhugeliang,
R.drawable.huangyueying,R.drawable.zhaoyun},
{R.drawable.lvmeng,R.drawable.luxun,R.drawable.sunquan,
R.drawable.zhouyu,R.drawable.sunshangxiang}};

//自己定义一个获得文字信息的方法
TextViewgetTextView(){
AbsListView.LayoutParamslp=newAbsListView.LayoutParams(
ViewGroup.LayoutParams.FILL_PARENT,64);
TextViewtextView=newTextView(
ExpandableList.this);
textView.setLayoutParams(lp);
textView.setGravity(Gravity.CENTER_VERTICAL);
textView.setPadding(36,0,0,0);
textView.setTextSize(20);
textView.setTextColor(Color.BLACK);
returntextView;
}


//重写ExpandableListAdapter中的各个方法
@Override
publicintgetGroupCount(){
//TODOAuto-generatedmethodstub
returngeneralsTypes.length;
}

@Override
publicObjectgetGroup(intgroupPosition){
//TODOAuto-generatedmethodstub
returngeneralsTypes[groupPosition];
}

@Override
publiclonggetGroupId(intgroupPosition){
//TODOAuto-generatedmethodstub
returngroupPosition;
}

@Override
publicintgetChildrenCount(intgroupPosition){
//TODOAuto-generatedmethodstub
returngenerals[groupPosition].length;
}

@Override
publicObjectgetChild(intgroupPosition,intchildPosition){
//TODOAuto-generatedmethodstub
returngenerals[groupPosition][childPosition];
}

@Override
publiclonggetChildId(intgroupPosition,intchildPosition){
//TODOAuto-generatedmethodstub
returnchildPosition;
}

@Override
publicbooleanhasStableIds(){
//TODOAuto-generatedmethodstub
returntrue;
}

@Override
publicViewgetGroupView(intgroupPosition,booleanisExpanded,
ViewconvertView,ViewGroupparent){
//TODOAuto-generatedmethodstub
LinearLayoutll=newLinearLayout(
ExpandableList.this);
ll.setOrientation(0);
ImageViewlogo=newImageView(ExpandableList.this);
logo.setImageResource(logos[groupPosition]);
logo.setPadding(50,0,0,0);
ll.addView(logo);
TextViewtextView=getTextView();
textView.setTextColor(Color.BLACK);
textView.setText(getGroup(groupPosition).toString());
ll.addView(textView);

returnll;
}

@Override
publicViewgetChildView(intgroupPosition,intchildPosition,
booleanisLastChild,ViewconvertView,ViewGroupparent){
//TODOAuto-generatedmethodstub
LinearLayoutll=newLinearLayout(
ExpandableList.this);
ll.setOrientation(0);
ImageViewgenerallogo=newImageView(
ExpandableList.this);
generallogo
.setImageResource(generallogos[groupPosition][childPosition]);
ll.addView(generallogo);
TextViewtextView=getTextView();
textView.setText(getChild(groupPosition,childPosition)
.toString());
ll.addView(textView);
returnll;
}

@Override
publicbooleanisChildSelectable(intgroupPosition,
intchildPosition){
//TODOAuto-generatedmethodstub
returntrue;
}

};

ExpandableListViewexpandableListView=(ExpandableListView)findViewById(R.id.list);
expandableListView.setAdapter(adapter);


//设置item点击的监听器
expandableListView.setOnChildClickListener(newOnChildClickListener(){

@Override
publicbooleanonChildClick(ExpandableListViewparent,Viewv,
intgroupPosition,intchildPosition,longid){

Toast.makeText(
ExpandableList.this,
"你点击了"+adapter.getChild(groupPosition,childPosition),
Toast.LENGTH_SHORT).show();

returnfalse;
}
});
}
}