可勾选的ExpandableListView
加上checkbox，需求大抵都是：check group, check all his children; if one' group's children all checked, group become checked. ExpandableListView的选中状态没有类似SparseBooleanArray的东东，需要自己维护一个数据结构. 开发上要求点group list item的大多数区域是expand/collapse,仅点checkbox区域是勾选，而点child list item的任意区域都是勾选效果, 可以让列表setOnChildClickListener()。注意ExpandableListAdapter的isChildSelectable()方法一定返回true。
编辑自http://www.allenj.net/?p=3644. 给出干货:
EListAdapter.java
package com.example.checkableexpandablelistview;
import java.util.ArrayList;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.BaseExpandableListAdapter;
import android.widget.CheckBox;
import android.widget.ExpandableListView;
import android.widget.TextView;
import com.example.aexpandablelist.R;
public class EListAdapter extends BaseExpandableListAdapter implements ExpandableListView.OnChildClickListener {
private Context context;
private ArrayList<Group> groups;
public EListAdapter(Context context, ArrayList<Group> groups) {
this.context = context;
this.groups = groups;
}
public Object getChild(int groupPosition, int childPosition) {
return groups.get(groupPosition).getChildItem(childPosition);
}
public long getChildId(int groupPosition, int childPosition) {
return childPosition;
}
public int getChildrenCount(int groupPosition) {
return groups.get(groupPosition).getChildrenCount();
}
public Object getGroup(int groupPosition) {
return groups.get(groupPosition);
}
public int getGroupCount() {
return groups.size();
}
public long getGroupId(int groupPosition) {
return groupPosition;
}
public boolean hasStableIds() {
return true;
}
public boolean isChildSelectable(int groupPosition, int childPosition) {
return true;
}
/** 設定 Group 資料 */
public View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) {
Group group = (Group) getGroup(groupPosition);
if (convertView == null) {
LayoutInflater infalInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView = infalInflater.inflate(R.layout.group_layout, null);
}
TextView tv = (TextView) convertView.findViewById(R.id.tvGroup);
tv.setText(group.getTitle());
// 重新產生 CheckBox 時，將存起來的 isChecked 狀態重新設定
CheckBox checkBox = (CheckBox) convertView.findViewById(R.id.chbGroup);
checkBox.setChecked(group.getChecked());
// 點擊 CheckBox 時，將狀態存起來
checkBox.setOnClickListener(new Group_CheckBox_Click(groupPosition));
return convertView;
}
/** 勾選 Group CheckBox 時，存 Group CheckBox 的狀態，以及改變 Child CheckBox 的狀態 */
class Group_CheckBox_Click implements OnClickListener {
private int groupPosition;
Group_CheckBox_Click(int groupPosition) {
this.groupPosition = groupPosition;
}
public void onClick(View v) {
groups.get(groupPosition).toggle();
// 將 Children 的 isChecked 全面設成跟 Group 一樣
int childrenCount = groups.get(groupPosition).getChildrenCount();
boolean groupIsChecked = groups.get(groupPosition).getChecked();
for (int i = 0; i < childrenCount; i++)
groups.get(groupPosition).getChildItem(i).setChecked(groupIsChecked);
// 注意，一定要通知 ExpandableListView 資料已經改變，ExpandableListView 會重新產生畫面
notifyDataSetChanged();
}
}
/** 設定 Children 資料 */
public View getChildView(int groupPosition, int childPosition, boolean isLastChild, View convertView, ViewGroup parent) {
Child child = groups.get(groupPosition).getChildItem(childPosition);
if (convertView == null) {
LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView = inflater.inflate(R.layout.child_layout, null);
}
TextView tv = (TextView) convertView.findViewById(R.id.tvChild);
tv.setText(child.getFullname());
// 重新產生 CheckBox 時，將存起來的 isChecked 狀態重新設定
CheckBox checkBox = (CheckBox) convertView.findViewById(R.id.chbChild);
checkBox.setChecked(child.getChecked());
// 點擊 CheckBox 時，將狀態存起來
checkBox.setOnClickListener(new Child_CheckBox_Click(groupPosition, childPosition));
return convertView;
}
/** 勾選 Child CheckBox 時，存 Child CheckBox 的狀態 */
class Child_CheckBox_Click implements OnClickListener {
private int groupPosition;
private int childPosition;
Child_CheckBox_Click(int groupPosition, int childPosition) {
this.groupPosition = groupPosition;
this.childPosition = childPosition;
}
public void onClick(View v) {
handleClick(childPosition, groupPosition);
}
}
public void handleClick(int childPosition, int groupPosition) {
groups.get(groupPosition).getChildItem(childPosition).toggle();
// 檢查 Child CheckBox 是否有全部勾選，以控制 Group CheckBox
int childrenCount = groups.get(groupPosition).getChildrenCount();
boolean childrenAllIsChecked = true;
for (int i = 0; i < childrenCount; i++) {
if (!groups.get(groupPosition).getChildItem(i).getChecked())
childrenAllIsChecked = false;
}
groups.get(groupPosition).setChecked(childrenAllIsChecked);
// 注意，一定要通知 ExpandableListView 資料已經改變，ExpandableListView 會重新產生畫面
notifyDataSetChanged();
}
@Override
public boolean onChildClick(ExpandableListView parent, View v, int groupPosition, int childPosition, long id) {
handleClick(childPosition, groupPosition);
return true;
}
}
Group.java
package com.example.checkableexpandablelistview;
import java.util.ArrayList;
public class Group {
private String id;
private String title;
private ArrayList<Child> children;
private boolean isChecked;
public Group(String id, String title) {
this.title = title;
children = new ArrayList<Child>();
this.isChecked = false;
}
public void setChecked(boolean isChecked) {
this.isChecked = isChecked;
}
public void toggle() {
this.isChecked = !this.isChecked;
}
public boolean getChecked() {
return this.isChecked;
}
public String getId() {
return id;
}
public String getTitle() {
return title;
}
public void addChildrenItem(Child child) {
children.add(child);
}
public int getChildrenCount() {
return children.size();
}
public Child getChildItem(int index) {
return children.get(index);
}
}
Child.java
package com.example.checkableexpandablelistview;
public class Child {
private String userid;
private String fullname;
private String username;
private boolean isChecked;
public Child(String userid, String fullname, String username) {
this.userid = userid;
this.fullname = fullname;
this.username = username;
this.isChecked = false;
}
public void setChecked(boolean isChecked) {
this.isChecked = isChecked;
}
public void toggle() {
this.isChecked = !this.isChecked;
}
public boolean getChecked() {
return this.isChecked;
}
public String getUserid() {
return userid;
}
public String getFullname() {
return fullname;
}
public String getUsername() {
return username;
}
}
MainActivity.java
package com.example.checkableexpandablelistview;
import java.util.ArrayList;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
import android.widget.ExpandableListView;
import com.example.aexpandablelist.R;
public class MainActivity extends Activity {
ArrayList<Group> groups;
ExpandableListView listView;
EListAdapter adapter;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
groups = new ArrayList<Group>();
getJSONObject();
listView = (ExpandableListView) findViewById(R.id.listView);
adapter = new EListAdapter(this, groups);
listView.setAdapter(adapter);
listView.setOnChildClickListener(adapter);
}
/** 解悉 JSON 字串 */
private void getJSONObject() {
String jsonStr = "{'CommunityUsersResult':[{'CommunityUsersList':[{'fullname':'a111','userid':11,'username':'a1'}"
+ ",{'fullname':'b222','userid':12,'username':'b2'}],'id':1,'title':'人事部'},{'CommunityUsersList':[{'fullname':"
+ "'c333','userid':13,'username':'c3'},{'fullname':'d444','userid':14,'username':'d4'},{'fullname':'e555','userid':"
+ "15,'username':'e5'}],'id':2,'title':'開發部'}]}";
try {
JSONObject CommunityUsersResultObj = new JSONObject(jsonStr);
JSONArray groupList = CommunityUsersResultObj.getJSONArray("CommunityUsersResult");
for (int i = 0; i < groupList.length(); i++) {
JSONObject groupObj = (JSONObject) groupList.get(i);
Group group = new Group(groupObj.getString("id"), groupObj.getString("title"));
JSONArray childrenList = groupObj.getJSONArray("CommunityUsersList");
for (int j = 0; j < childrenList.length(); j++) {
JSONObject childObj = (JSONObject) childrenList.get(j);
Child child = new Child(childObj.getString("userid"), childObj.getString("fullname"),
childObj.getString("username"));
group.addChildrenItem(child);
}
groups.add(group);
}
} catch (JSONException e) {
Log.d("allenj", e.toString());
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.activity_main, menu);
return true;
}
}
activity_main.xml
<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:id="@+id/listView"
android:layout_width="match_parent"
android:layout_height="wrap_content" >
</ExpandableListView>
</RelativeLayout>
group_layout.xml
<?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" >
<TextView
android:id="@+id/tvGroup"
android:layout_width="280dp"
android:layout_height="45dip"
android:gravity="center_vertical|left"
android:paddingLeft="45dp"
android:textSize="17dip"
android:textStyle="bold" >
</TextView>
<CheckBox
android:id="@+id/chbGroup"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:focusable="false" />
</LinearLayout>
child_layout.xml
<?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" > <TextView android:id="@+id/tvChild" android:layout_width="280dp" android:layout_height="45dip" android:gravity="center_vertical" android:paddingLeft="45dp" android:textSize="17dip" android:textStyle="bold" > </TextView> <CheckBox android:id="@+id/chbChild" android:layout_width="wrap_content" android:layout_height="wrap_content" android:clickable="false" android:focusable="false" /> </LinearLayout>