ExpandableListView 可勾选

今天在项目中用到 Group 中含有 CheckBox  Child 中也含有 CheckBox  并且 当Group 选中时 Child 也全部选中  如图 ：

当然之前也在项目中写过，但是为了防止忘记  在简书记载一下，直接上代码。

EListAdapter.java


package text.com.myapplication;

/**

* Created by Administrator on 2018/05/09.

*/

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 java.util.List;

public class EListAdapterextends BaseExpandableListAdapterimplements ExpandableListView.OnChildClickListener {

private Contextcontext;

    private Listgroups;

    private ExpandableListViewlistView;

    public EListAdapter(Context context, List groups, ExpandableListView listView) {

this.context = context;

        this.groups = groups;

        this.listView = listView;

    }

public ObjectgetChild(int groupPosition, int childPosition) {

return groups.get(groupPosition).getChildren();

    }

/**

* 获取  选中状态的数据

*

    * @return

    */

    public ListgetData() {

return groups;

    }

public long getChildId(int groupPosition, int childPosition) {

return childPosition;

    }

public int getChildrenCount(int groupPosition) {

return groups.get(groupPosition).getChildren().size();

    }

public ObjectgetGroup(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 ViewgetGroupView(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.isChecked());

        // 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_Clickimplements OnClickListener {

private int groupPosition;

        Group_CheckBox_Click(int groupPosition) {

this.groupPosition= groupPosition;

        }

public void onClick(View v) {

int childrenCount =groups.get(groupPosition).getChildren().size();

            //  在 对 Group 点击数据进行处理时 先判断 现在的状态（isChecked） 如果已经勾选 则取消

            if (groups.get(groupPosition).isChecked()){

groups.get(groupPosition).setChecked(false);

                listView.collapseGroup(groupPosition);

            }

else {

groups.get(groupPosition).setChecked(true);

                listView.expandGroup(groupPosition);

            }

boolean groupIsChecked =groups.get(groupPosition).isChecked();

            // 將 Children 的 isChecked 全面設成跟 Group 一樣

            for (int i =0; i < childrenCount; i++)

groups.get(groupPosition).getChildren().get(i).setChecked(groupIsChecked);

            // 注意，一定要通知 ExpandableListView  资料已经变更 ExpandableListView需要刷新

            notifyDataSetChanged();

        }

}

/**

* 設定 Children 資料

*/

    public ViewgetChildView(int groupPosition, int childPosition, boolean isLastChild, View convertView, ViewGroup parent) {

Child child =groups.get(groupPosition).getChildren().get(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.getUsername());

        // 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.isChecked());

        // 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_Clickimplements 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) {

int childrenCount =groups.get(groupPosition).getChildren().size();

        //  在 Group 的 Child 点击数据进行处理时 先判断 现在的状态（isChecked） 如果已经勾选 则取消

        if (groups.get(groupPosition).getChildren().get(childPosition).isChecked())

groups.get(groupPosition).getChildren().get(childPosition).setChecked(false);

        else groups.get(groupPosition).getChildren().get(childPosition).setChecked(true);

        // 檢查 Child CheckBox 是否有全部勾選，以控制 Group CheckBox  默认Group为勾选状态

// 当遍历Group 自数据发现有 未勾选数据时  返回 fale

        boolean childrenAllIsChecked =true;

        for (int i =0; i < childrenCount; i++) {

// 主意    if (!groups.get(groupPosition).getChildren().get(i).isChecked())

//        是  i  不是 childPosition

            if (!groups.get(groupPosition).getChildren().get(i).isChecked())

childrenAllIsChecked =false;

        }

groups.get(groupPosition).setChecked(childrenAllIsChecked);

        // 注意，一定要通知 ExpandableListView  资料已经变更 ExpandableListView需要刷新

        notifyDataSetChanged();

    }

@Override

    public boolean onChildClick(ExpandableListView parent, View v, int groupPosition, int childPosition, long id) {

handleClick(childPosition, groupPosition);

return true;

    }

}

Group.java


package text.com.myapplication;

/**

* Created by Administrator on 2018/05/09.

*/

import java.util.ArrayList;

public class Group {

private Stringtitle;

    private ArrayListchildren;

    private boolean isChecked=false;

    public StringgetTitle() {

return title;

    }

public void setTitle(String title) {

this.title = title;

    }

public ArrayListgetChildren() {

return children;

    }

public void setChildren(ArrayList children) {

this.children = children;

    }

public boolean isChecked() {

return isChecked;

    }

public void setChecked(boolean checked) {

isChecked = checked;

    }

}


Child.java


package text.com.myapplication;

/**

* Created by Administrator on 2018/05/09.

*/

public class Child {

private Stringusername;

    private boolean isChecked=false;

    public StringgetUsername() {

return username;

    }

public void setUsername(String username) {

this.username = username;

    }

public boolean isChecked() {

return isChecked;

    }

public void setChecked(boolean checked) {

isChecked = checked;

    }

}

MainActivity.java


package text.com.myapplication;

import android.os.Bundle;

import android.support.v7.app.AppCompatActivity;

import android.widget.ExpandableListView;

import java.util.ArrayList;

import java.util.List;

public class MainActivityextends AppCompatActivity {

ExpandableListViewlistView;

    EListAdapteradapter;

    @Override

    public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        listView = (ExpandableListView) findViewById(R.id.listView);

        adapter =new EListAdapter(MainActivity.this,  getData(),listView);

        listView.setAdapter(adapter);

        listView.setOnChildClickListener(adapter);

    }

private ListgetData() {

List groups =new ArrayList<>();

        for (int i =0; i <15; i++) {

List children =new ArrayList<>();

            text.com.myapplication.Group group =new Group();

            group.setTitle("group" + i);

            for (int j =0; j <10; j++) {

Child child =new Child();

                child.setUsername("child" + j);

                children.add(child);

            }

group.setChildren((ArrayList) children);

            groups.add(group);

        }

return groups;

    }

}

activity_main.xml


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

    android:layout_width="match_parent"

    android:layout_height="match_parent" >

        android:id="@+id/listView"

        android:layout_width="match_parent"

        android:layout_height="wrap_content" >


group_layout.xml


    android:layout_width="match_parent"

    android:layout_height="45dp"

    android:orientation="horizontal">

        android:id="@+id/tvGroup"

        android:layout_width="wrap_content"

        android:layout_height="45dip"

        android:layout_marginLeft="30dp"

        android:gravity="center_vertical|left"

        android:textSize="17dip"

        android:textStyle="bold">

        android:id="@+id/chbGroup"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_alignParentRight="true"

        android:layout_centerHorizontal="true"

        android:layout_marginRight="10dp"

        android:focusable="false" />

child_layout.xml


    android:layout_width="match_parent"

    android:layout_height="45dip"

    android:background="#5f6c68"

    android:orientation="horizontal">

        android:id="@+id/tvChild"

        android:layout_width="wrap_content"

        android:layout_height="45dip"

        android:layout_marginLeft="35dp"

        android:gravity="center_vertical"

        android:textSize="17dip"

        android:textStyle="bold">

        android:id="@+id/chbChild"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_alignParentRight="true"

        android:layout_centerHorizontal="true"

        android:layout_marginRight="10dp"

        android:clickable="false"

        android:focusable="false" />

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