Android之实现QQ好友分组(ExpandableListView)

在项目开发中，也许我们遇到过ListView中嵌套ListView，但谷歌建议我们最好别这样做，因此他们写好了一个ExpandableListView类，他继承ListView，可以实现ListView中嵌套ListView的效果，好了，废话不多说，先上效果图：
点击下载源码：仿QQ好友分组源代码



主代码：

[java]
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public class ExListView
extends Activity {
private static
final String GROUP_TEXT = "group_text";//大组成员Map的key

private static
final String CHILD_TEXT1 = "child_text1";//小组成员Map的第一个key

private static
final String CHILD_TEXT2 = "child_text2";//小组成员Map的第二个key

List<Map<String, String>> groupData = new ArrayList<Map<String, String>>();//大组成员

List<List<Map<String, String>>> childData =
new ArrayList<List<Map<String, String>>>();//小组成员

ExAdapter adapter;
ExpandableListView exList;//可扩展的ListView

@Override
public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.main);
//为大小组中添加数据
for (int i =
1; i < 6; i++) {

Map<String, String> curGroupMap = new HashMap<String, String>();

groupData.add(curGroupMap);
curGroupMap.put(GROUP_TEXT, "第" + i +
"大组");

List<Map<String, String>> children =
new ArrayList<Map<String, String>>();
for (int j =
1; j < 6; j++) {

Map<String, String> curChildMap =
new HashMap<String, String>();
children.add(curChildMap);
curChildMap.put(CHILD_TEXT1, "第" + j +
"小组");
curChildMap.put(CHILD_TEXT2,
"第" + j + "小组签名");

}
childData.add(children);
}

adapter = new ExAdapter(ExListView.this);

exList = (ExpandableListView) findViewById(R.id.list);

exList.setAdapter(adapter);
exList.setGroupIndicator(null);//不设置大组指示器图标，因为我们自定义设置了

exList.setDivider(null);//设置图片可拉伸的

}
//关键代码是这个可扩展的listView适配器

class ExAdapter
extends BaseExpandableListAdapter {
Context context;

public ExAdapter(Context context) {

super();

this.context = context;

}
//得到大组成员的view
public View getGroupView(int groupPosition,
boolean isExpanded,
View convertView, ViewGroup parent) {
View view = convertView;
if (view == null) {

LayoutInflater inflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);

view = inflater.inflate(R.layout.member_listview,
null);
}

TextView title = (TextView) view.findViewById(R.id.content_001);

title.setText(getGroup(groupPosition).toString());//设置大组成员名称

ImageView image = (ImageView) view.findViewById(R.id.tubiao);//是否展开大组的箭头图标

if (isExpanded)//大组展开时

image.setBackgroundResource(R.drawable.btn_browser2);

else//大组合并时

image.setBackgroundResource(R.drawable.btn_browser);

return view;
}
//得到大组成员的id
public long getGroupId(int groupPosition) {

return groupPosition;

}
//得到大组成员名称
public Object getGroup(int groupPosition) {

return groupData.get(groupPosition).get(GROUP_TEXT).toString();

}
//得到大组成员总数
public int getGroupCount() {

return groupData.size();

}

// 得到小组成员的view
public View getChildView(int groupPosition,
int childPosition,
boolean isLastChild, View convertView, ViewGroup parent) {

View view = convertView;
if (view == null) {

LayoutInflater inflater = LayoutInflater.from(context);

view = inflater.inflate(R.layout.member_childitem,
null);
}
final TextView title = (TextView) view

.findViewById(R.id.child_text);

title.setText(childData.get(groupPosition).get(childPosition)

.get(CHILD_TEXT1).toString());//大标题

final TextView title2 = (TextView) view

.findViewById(R.id.child_text2);

title2.setText(childData.get(groupPosition).get(childPosition)

.get(CHILD_TEXT2).toString());//小标题

return view;

}
//得到小组成员id

public long getChildId(int groupPosition,
int childPosition) {
return childPosition;

}
//得到小组成员的名称

public Object getChild(int groupPosition,
int childPosition) {
return childData.get(groupPosition).get(childPosition).get(CHILD_TEXT1)

.toString();
}
//得到小组成员的数量
public int getChildrenCount(int groupPosition) {

return childData.get(groupPosition).size();

}
/**
* Indicates whether the child and group IDs are stable across changes to the

* underlying data.
* 表明大組和小组id是否稳定的更改底层数据。

* @return whether or not the same ID always refers to the same object

* @see Adapter#hasStableIds()

*/
public boolean hasStableIds() {

return true;

}
//得到小组成员是否被选择
public boolean isChildSelectable(int groupPosition,
int childPosition) {
return true;

}

}
}

public class ExListView extends Activity {
private static final String GROUP_TEXT = "group_text";//大组成员Map的key
private static final String CHILD_TEXT1 = "child_text1";//小组成员Map的第一个key
private static final String CHILD_TEXT2 = "child_text2";//小组成员Map的第二个key

List<Map<String, String>> groupData = new ArrayList<Map<String, String>>();//大组成员
List<List<Map<String, String>>> childData = new ArrayList<List<Map<String, String>>>();//小组成员

ExAdapter adapter;
ExpandableListView exList;//可扩展的ListView

@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
//为大小组中添加数据
for (int i = 1; i < 6; i++) {
Map<String, String> curGroupMap = new HashMap<String, String>();
groupData.add(curGroupMap);
curGroupMap.put(GROUP_TEXT, "第" + i + "大组");

List<Map<String, String>> children = new ArrayList<Map<String, String>>();
for (int j = 1; j < 6; j++) {
Map<String, String> curChildMap = new HashMap<String, String>();
children.add(curChildMap);
curChildMap.put(CHILD_TEXT1, "第" + j + "小组");
curChildMap.put(CHILD_TEXT2, "第" + j + "小组签名");
}
childData.add(children);
}

adapter = new ExAdapter(ExListView.this);
exList = (ExpandableListView) findViewById(R.id.list);
exList.setAdapter(adapter);
exList.setGroupIndicator(null);//不设置大组指示器图标，因为我们自定义设置了
exList.setDivider(null);//设置图片可拉伸的
}
//关键代码是这个可扩展的listView适配器
class ExAdapter extends BaseExpandableListAdapter {
Context context;

public ExAdapter(Context context) {
super();
this.context = context;
}
//得到大组成员的view
public View getGroupView(int groupPosition, boolean isExpanded,
View convertView, ViewGroup parent) {
View view = convertView;
if (view == null) {
LayoutInflater inflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
view = inflater.inflate(R.layout.member_listview, null);
}

TextView title = (TextView) view.findViewById(R.id.content_001);
title.setText(getGroup(groupPosition).toString());//设置大组成员名称

ImageView image = (ImageView) view.findViewById(R.id.tubiao);//是否展开大组的箭头图标
if (isExpanded)//大组展开时
image.setBackgroundResource(R.drawable.btn_browser2);
else//大组合并时
image.setBackgroundResource(R.drawable.btn_browser);

return view;
}
//得到大组成员的id
public long getGroupId(int groupPosition) {
return groupPosition;
}
//得到大组成员名称
public Object getGroup(int groupPosition) {
return groupData.get(groupPosition).get(GROUP_TEXT).toString();
}
//得到大组成员总数
public int getGroupCount() {
return groupData.size();

}

// 得到小组成员的view
public View getChildView(int groupPosition, int childPosition,
boolean isLastChild, View convertView, ViewGroup parent) {
View view = convertView;
if (view == null) {
LayoutInflater inflater = LayoutInflater.from(context);
view = inflater.inflate(R.layout.member_childitem, null);
}
final TextView title = (TextView) view
.findViewById(R.id.child_text);
title.setText(childData.get(groupPosition).get(childPosition)
.get(CHILD_TEXT1).toString());//大标题
final TextView title2 = (TextView) view
.findViewById(R.id.child_text2);
title2.setText(childData.get(groupPosition).get(childPosition)
.get(CHILD_TEXT2).toString());//小标题

return view;
}
//得到小组成员id
public long getChildId(int groupPosition, int childPosition) {
return childPosition;
}
//得到小组成员的名称
public Object getChild(int groupPosition, int childPosition) {
return childData.get(groupPosition).get(childPosition).get(CHILD_TEXT1)
.toString();
}
//得到小组成员的数量
public int getChildrenCount(int groupPosition) {
return childData.get(groupPosition).size();
}
/**
* Indicates whether the child and group IDs are stable across changes to the
* underlying data.
* 表明大組和小组id是否稳定的更改底层数据。
* @return whether or not the same ID always refers to the same object
* @see Adapter#hasStableIds()
*/
public boolean hasStableIds() {
return true;
}
//得到小组成员是否被选择
public boolean isChildSelectable(int groupPosition, int childPosition) {
return true;
}

}
}

主界面配置文件main.xml:

[html]
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<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"

xmlns:tools="http://schemas.android.com/tools"

android:layout_width="fill_parent"

android:layout_height="fill_parent"

android:background="@drawable/default_bg"
>

<ExpandableListView

android:id="@+id/list"

android:layout_width="fill_parent"

android:layout_height="fill_parent"

android:layout_alignParentLeft="true"
android:cacheColorHint="#00000000"
/><!-- 背景设置为透明，防止滑动时，白屏 -->

</RelativeLayout>

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="@drawable/default_bg" >

<ExpandableListView
android:id="@+id/list"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_alignParentLeft="true" android:cacheColorHint="#00000000" /><!-- 背景设置为透明，防止滑动时，白屏 -->

</RelativeLayout>

大组成员配置文件member_listview.xml：

[html]
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<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"

xmlns:tools="http://schemas.android.com/tools"

android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:layout_gravity="center_horizontal"
>

<LinearLayout

android:id="@+id/layout_013"

android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:orientation="horizontal"
>

<ImageView

android:id="@+id/ImageView01"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:gravity="center_vertical"

android:paddingTop="10dp"

android:src="@drawable/user_group"
>
</ImageView>

<RelativeLayout

android:id="@+id/layout_013"

android:layout_width="wrap_content"

android:layout_height="wrap_content"
>

<TextView

android:id="@+id/content_001"

android:layout_width="wrap_content"

android:layout_height="fill_parent"

android:layout_gravity="center_vertical"

android:gravity="center_vertical"

android:paddingLeft="10dp"

android:textColor="#FFFFFF"

android:textSize="30sp"
>
</TextView>

<ImageView

android:id="@+id/tubiao"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_alignParentRight="true"
>
</ImageView>

</RelativeLayout>

</LinearLayout>

<!--
<RelativeLayout
android:id="@+id/layout_013"

android:layout_width="fill_parent"

android:layout_height="fill_parent">

<ImageView
android:id="@+id/ImageView01"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:src="@drawable/icon"></ImageView>

<TextView
android:id="@+id/content_001"

android:text="@+id/TextView01"

android:layout_width="wrap_content"

android:layout_toRightOf="@+id/ImageView01"

android:layout_height="wrap_content"></TextView>

<ImageView
android:layout_width="wrap_content"

android:layout_toRightOf="@+id/content_001"

android:layout_height="wrap_content"

android:id="@+id/tubiao"></ImageView>

</RelativeLayout>

-->

</LinearLayout>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal" >

<LinearLayout
android:id="@+id/layout_013"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="horizontal" >

<ImageView
android:id="@+id/ImageView01"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:gravity="center_vertical"
android:paddingTop="10dp"
android:src="@drawable/user_group" >
</ImageView>

<RelativeLayout
android:id="@+id/layout_013"
android:layout_width="wrap_content"
android:layout_height="wrap_content" >

<TextView
android:id="@+id/content_001"
android:layout_width="wrap_content"
android:layout_height="fill_parent"
android:layout_gravity="center_vertical"
android:gravity="center_vertical"
android:paddingLeft="10dp"
android:textColor="#FFFFFF"
android:textSize="30sp" >
</TextView>

<ImageView
android:id="@+id/tubiao"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true" >
</ImageView>
</RelativeLayout>
</LinearLayout>

<!--
<RelativeLayout android:id="@+id/layout_013"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<ImageView android:id="@+id/ImageView01"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@drawable/icon"></ImageView>
<TextView android:id="@+id/content_001"
android:text="@+id/TextView01"
android:layout_width="wrap_content"
android:layout_toRightOf="@+id/ImageView01"
android:layout_height="wrap_content"></TextView>
<ImageView android:layout_width="wrap_content"
android:layout_toRightOf="@+id/content_001"
android:layout_height="wrap_content"
android:id="@+id/tubiao"></ImageView>
</RelativeLayout>

-->

</LinearLayout>

小组成员配置文件member_childitem.xml：

[html]
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<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"

xmlns:tools="http://schemas.android.com/tools"

android:id="@+id/childlayout"

android:layout_width="fill_parent"

android:layout_height="fill_parent"

android:orientation="horizontal"
>

<ImageView

android:id="@+id/child_image"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_marginLeft="40dp"

android:background="@drawable/child_image"

android:paddingTop="10dp"
>
</ImageView>

<LinearLayout

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:orientation="vertical"
>

<TextView

android:id="@+id/child_text"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_gravity="center_vertical"

android:gravity="center_vertical"

android:text=""

android:textColor="#FFFFFF"

android:textSize="25sp"
>
</TextView>

<TextView

android:id="@+id/child_text2"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_gravity="center_vertical"

android:gravity="center_vertical"

android:text=""

android:textColor="#FFFFFF"

android:textSize="20sp"
>
</TextView>

</LinearLayout>

</LinearLayout>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/childlayout"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="horizontal" >

<ImageView
android:id="@+id/child_image"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="40dp"
android:background="@drawable/child_image"
android:paddingTop="10dp" >
</ImageView>

<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical" >

<TextView
android:id="@+id/child_text"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_vertical"
android:gravity="center_vertical"
android:text=""
android:textColor="#FFFFFF"
android:textSize="25sp" >
</TextView>

<TextView
android:id="@+id/child_text2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_vertical"
android:gravity="center_vertical"
android:text=""
android:textColor="#FFFFFF"
android:textSize="20sp" >
</TextView>
</LinearLayout>

</LinearLayout>

好了，今天就到这里，中午休息一会。。。