可勾选的ExpandableListView

最新推荐文章于 2024-11-20 16:13:53 发布

you4580

最新推荐文章于 2024-11-20 16:13:53 发布

阅读量473

点赞数

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

[java]view plaincopy 
   
 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

[java]view plaincopy 
   
 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

[java]view plaincopy 
   
 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

[java]view plaincopy 
   
 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

[java]view plaincopy 
   
 <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

[java]view plaincopy 
   
 <?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

[java]view plaincopy 
   
 <?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>  