ExpandableListView介绍：
长话短说，ExpandableListView就是ListView的扩展。像QQ好友分组列表。看下面的效果图，就知道了。
效果图:
ExpandableListView有几个属性值得一说：
android:childDivider
来分离子列表项的图片或者是颜色。注：图片不会完全显示，分离子列表项的是一条直线
android:childIndicator
在子列表项旁边显示的指示符。注：可以是一个图片
android:childIndicatorLeft
子列表项指示符的左边约束位置。注：即从左端0位置开始计数，比如，假设指示符是一个图标，给定这个属性值为3dip，则表示从左端起3dip开始显示此图标。
android:childIndicatorRight
子列表项指示符的右边约束位置。注：表示右端到什么位置结束
android:groupIndicator
在组列表项旁边显示的指示符。注：可以是一个图片，如果不想要指示器可以设置为@null。
android:indicatorLeft
组列表项指示器的左边约束位置。注：表示左端从什么位置开始（测试了下，在android 4.4的模拟器下没效果）。
android:indicatorRight
组列表项指示器的右边约束位置。注：表示右端到什么位置结束（测试了下，在android 4.4的模拟器下没效果）。
代码：
package cn.datian.expandablelistviewtest2;
import java.util.ArrayList;
import java.util.List;
import android.os.Bundle;
import android.annotation.SuppressLint;
import android.app.Activity;
import android.util.Log;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseExpandableListAdapter;
import android.widget.ExpandableListView;
import android.widget.TextView;
import android.widget.Toast;
@SuppressLint("NewApi")
public class MainActivity extends Activity {
/**
* 子类的数据集合
*/
private List<List<String>> childrenList;
/**
* 组集合
*/
private List<String> groupList;
private ExpandableListView eListView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
initDate();
eListView = (ExpandableListView) this.findViewById(R.id.eListView);
eListView.setAdapter(adapter);
//展开第一组,调用了expandGroup(4,false);
eListView.expandGroup(0);
//下标从0开始，展开第五组，为true表示滚动到第五组的位置。
// eListView.expandGroup(4,true);
eListView.setOnGroupClickListener(new ExpandableListView.OnGroupClickListener() {
@Override
public boolean onGroupClick(ExpandableListView parent, View v,
int groupPosition, long id) {
Toast.makeText(MainActivity.this, "你点击了："+groupList.get(groupPosition),Toast.LENGTH_SHORT).show();
return false;
}
});
//点击组下的子条目监听
eListView.setOnChildClickListener(new ExpandableListView.OnChildClickListener() {
@Override
public boolean onChildClick(ExpandableListView parent, View v,
int groupPosition, int childPosition, long id) {
Toast.makeText(MainActivity.this, "你点击了："+childrenList.get(groupPosition).get(childPosition), Toast.LENGTH_SHORT).show();
return true;
}
});
}
/**
* 初始化数据
*/
private void initDate() {
childrenList = new ArrayList<List<String>>();
groupList = new ArrayList<String>();
addDate("小学","张三");
addDate("中学","李四");
addDate("高中","王五");
addDate("大学","赵六");
addDate("硕士","小红");
addDate("博士","小明");
addDate("博士后","大明");
}
private void addDate(String group, String chlidren) {
groupList.add(group);
List<String> cs = new ArrayList<String>();
for(int i = 0;i < 10;i++){
cs.add(chlidren+i);
}
childrenList.add(cs);
}
BaseExpandableListAdapter adapter = new BaseExpandableListAdapter() {
/**
* 返回true,表明子条目是可选的。
*/
@Override
public boolean isChildSelectable(int groupPosition, int childPosition) {
Log.i("adpter", "isChildSelectable");
return true;
}
@Override
public boolean hasStableIds() {
Log.i("adpter", "hasStableIds");
return false;
}
@Override
public View getGroupView(int groupPosition, boolean isExpanded,
View convertView, ViewGroup parent) {
Log.i("adpter", "getGroupView");
View v = View.inflate(MainActivity.this, R.layout.group_item,null);
TextView tv= (TextView) v.findViewById(R.id.tv);
tv.setText(groupList.get(groupPosition));
tv.setPadding(20, 0, 0, 0);
return v;
}
@Override
public long getGroupId(int groupPosition) {
Log.i("adpter", "getGroupId");
return groupPosition;
}
@Override
public int getGroupCount() {
Log.i("adpter", "getGroupCount");
return groupList.size();
}
@Override
public Object getGroup(int groupPosition) {
Log.i("adpter", "getGroup");
return groupList.get(groupPosition);
}
@Override
public int getChildrenCount(int groupPosition) {
Log.i("adpter", "getChildrenCount");
return childrenList.get(groupPosition).size();
}
@Override
public View getChildView(int groupPosition, int childPosition,
boolean isLastChild, View convertView, ViewGroup parent) {
Log.i("adpter", "getChildView");
TextView tv = new TextView(MainActivity.this);
tv.setText(childrenList.get(groupPosition).get(childPosition));
tv.setPadding(20, 0, 0, 0);
return tv;
}
@Override
public long getChildId(int groupPosition, int childPosition) {
Log.i("adpter", "getChildId");
return childrenList.get(groupPosition).size();
}
@Override
public Object getChild(int groupPosition, int childPosition) {
Log.i("adpter", "getChild");
return childrenList.get(groupPosition).get(childPosition);
}
};
}
layout布局:
<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"
>
<ExpandableListView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/eListView"
android:groupIndicator="@drawable/expandable_indicator_selector"
android:indicatorLeft="5dp"
android:indicatorRight="30dp"
></ExpandableListView>
</RelativeLayout>
layout组条目布局：
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:layout_margin="10dp"
>
<TextView
android:id="@+id/tv"
android:layout_width="wrap_content"
android:layout_height="50dp"
android:text=""
android:textSize="20sp"
android:layout_marginLeft="40dp"
android:gravity="center_vertical"
/>
</LinearLayout>
android:groupIndicator="@drawable/expandable_indicator_selector" ： 使用选择器 选择器代码：
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android" >
<item android:state_expanded="true" android:drawable="@drawable/contract" />
<item android:drawable="@drawable/expand"></item>
</selector>
ExpandableListView的简单案例
时间： 2024-10-28 20:45:30