使用 Listview 中的复选框获取所选项目

Posted 2023-04-18

【中文标题】使用 Listview 中的复选框获取所选项目

【英文标题】：Get Selected Item Using Checkbox in Listview

【发布时间】：2013-08-12 08:15:56

【问题描述】：

我正在创建一个 android 应用程序，其中有一个 ListView，它显示了我手机中安装的所有应用程序。

我的ListView是自定义的，它包含了一个Icon、TextView和CheckBox，图标的用途是显示应用的图标，TextView是显示应用的名称，CheckBox的用途是确定我在 ListView 中选择了什么项目。

当我单击应用程序中的按钮时，如何确定在 ListView 行中选择的 CheckBox 是什么？我是 Android 新手，所以我不知道我应该采取什么方法。

这是我的代码：

public class AppInfo 
    public Drawable icon;
    public String applicationName;

    public AppInfo()
        super();
    

    public AppInfo(Drawable icon, String applicationName)
        super();
        this.icon = icon;
        this.applicationName = applicationName;
    

---

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ImageView;
import android.widget.TextView;
import android.app.Activity;
import android.widget.CheckBox;

public class AppInfoAdapter extends ArrayAdapter<AppInfo> 

    Context context;
    int layoutResourceId;
    AppInfo  data[] = null;

    public AppInfoAdapter(Context context, int layoutResourceId, AppInfo[] data)
        super(context, layoutResourceId,data);
        this.layoutResourceId = layoutResourceId;
        this.context = context;
        this.data = data;
    

    @Override
    public View getView(int position, View convertView, ViewGroup parent)

        View row = convertView;
        AppInfoHolder holder= null;

        if (row == null)

            LayoutInflater inflater = ((Activity)context).getLayoutInflater();
            row = inflater.inflate(layoutResourceId, parent, false);

            holder = new AppInfoHolder();

            holder.imgIcon = (ImageView) row.findViewById(R.id.imgPackageIcon);
            holder.txtTitle = (TextView) row.findViewById(R.id.txtApplicationName);
            holder.chkSelect = (CheckBox) row.findViewById(R.id.chkSelect);

            row.setTag(holder);

        
        else
            holder = (AppInfoHolder)row.getTag();
        


        AppInfo appinfo = data[position];
        holder.txtTitle.setText(appinfo.applicationName);
        holder.imgIcon.setImageDrawable(appinfo.icon);
        holder.chkSelect.setChecked(true);

        return row;

    

---

import android.widget.ImageView;
import android.widget.TextView;
import android.widget.CheckBox;

public class AppInfoHolder 

    ImageView imgIcon;
    TextView txtTitle;
    CheckBox chkSelect;

---

import android.app.Activity;
import android.content.pm.ApplicationInfo;
import android.content.pm.PackageManager;
import android.os.Bundle;
import android.widget.ArrayAdapter;
import android.widget.BaseAdapter; 
import android.widget.ListView;
import android.widget.TextView;

import java.util.ArrayList;
import java.util.List;
import android.content.pm.PackageInfo;

public class CacheActivity extends Activity 

        @Override
        protected void onCreate(Bundle savedInstanceState)
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_cache);


            final ListView listApplication = (ListView)findViewById(R.id.listApplication);

            ApplicationInfo applicationInfo = getApplicationInfo();
            PackageManager pm = getPackageManager();
            List<PackageInfo> pInfo = new ArrayList<PackageInfo>();
            pInfo.addAll(pm.getInstalledPackages(0));
            AppInfo app_info[] = new AppInfo[pInfo.size()];

            int counter = 0;
            for(PackageInfo item: pInfo)
                try

                    applicationInfo = pm.getApplicationInfo(item.packageName, 1);

                    app_info[counter] = new AppInfo(pm.getApplicationIcon(applicationInfo), 
                            String.valueOf(pm.getApplicationLabel(applicationInfo)));

                    System.out.println(counter);

                
                catch(Exception e)
                     System.out.println(e.getMessage());
                

                counter++;
            

            AppInfoAdapter adapter = new AppInfoAdapter(this, R.layout.listview_item_row, app_info);
            listApplication.setAdapter(adapter);

        

【问题讨论】：

您可以为此目的使用稀疏布尔数组。

您是否希望在单击按钮时复选框选中行中的项目？因为你的标题说“当我单击按钮时，”。

【参考方案1】：

假设您想要获取在单击按钮时选中复选框的行中的项目。基于您的标题“当我单击按钮时使用 Listview 中的复选框获取所选项目”的假设。

试试下面的。仅进行如下更改。其余部分保持不变。

题目解释与讨论@

https://groups.google.com/forum/?fromgroups#!topic/android-developers/No0LrgJ6q2M

MainActivity.java

public class MainActivity extends Activity 
     AppInfoAdapter adapter ;
     AppInfo app_info[] ;
        @Override
        protected void onCreate(Bundle savedInstanceState)
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);


            final ListView listApplication = (ListView)findViewById(R.id.listApplication);
            Button b= (Button) findViewById(R.id.button1);
            b.setOnClickListener(new OnClickListener()
            

                @Override
                public void onClick(View v) 
                    // TODO Auto-generated method stub

                    StringBuilder result = new StringBuilder();
                    for(int i=0;i<adapter.mCheckStates.size();i++)
                    
                        if(adapter.mCheckStates.get(i)==true)
                        

                                           result.append(app_info[i].applicationName);
                            result.append("\n");
                        

                    
                    Toast.makeText(MainActivity.this, result, 1000).show();
                

            );

            ApplicationInfo applicationInfo = getApplicationInfo();
            PackageManager pm = getPackageManager();
            List<PackageInfo> pInfo = new ArrayList<PackageInfo>();
            pInfo.addAll(pm.getInstalledPackages(0));
            app_info = new AppInfo[pInfo.size()];

            int counter = 0;
            for(PackageInfo item: pInfo)
                try

                    applicationInfo = pm.getApplicationInfo(item.packageName, 1);

                    app_info[counter] = new AppInfo(pm.getApplicationIcon(applicationInfo), 
                            String.valueOf(pm.getApplicationLabel(applicationInfo)));

                    System.out.println(counter);

                
                catch(Exception e)
                     System.out.println(e.getMessage());
                

                counter++;
            

           adapter = new AppInfoAdapter(this, R.layout.listview_item_row, app_info);
            listApplication.setAdapter(adapter);

        

activity_main.xml 带有按钮的 ListView

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_
    android:layout_
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".MainActivity" >

    <ListView
        android:layout_
        android:id="@+id/listApplication"
        android:layout_
        android:layout_above="@+id/button1"
        android:text="@string/hello_world" />

    <Button
        android:id="@+id/button1"
        android:layout_
        android:layout_
        android:layout_alignParentBottom="true"
        android:layout_centerHorizontal="true"
        android:text="Button" />

</RelativeLayout>

AppInfoAdapter

public class AppInfoAdapter extends ArrayAdapter<AppInfo> implements CompoundButton.OnCheckedChangeListener
  SparseBooleanArray mCheckStates; 

    Context context;
    int layoutResourceId;
    AppInfo  data[] = null;

    public AppInfoAdapter(Context context, int layoutResourceId, AppInfo[] data)
        super(context, layoutResourceId,data);
        this.layoutResourceId = layoutResourceId;
        this.context = context;
        this.data = data;
        mCheckStates = new SparseBooleanArray(data.length);
    

    @Override
    public View getView(int position, View convertView, ViewGroup parent)

        View row = convertView;
        AppInfoHolder holder= null;

        if (row == null)

            LayoutInflater inflater = ((Activity)context).getLayoutInflater();
            row = inflater.inflate(layoutResourceId, parent, false);

            holder = new AppInfoHolder();

            holder.imgIcon = (ImageView) row.findViewById(R.id.imageView1);
            holder.txtTitle = (TextView) row.findViewById(R.id.textView1);
            holder.chkSelect = (CheckBox) row.findViewById(R.id.checkBox1);

            row.setTag(holder);

        
        else
            holder = (AppInfoHolder)row.getTag();
        


        AppInfo appinfo = data[position];
        holder.txtTitle.setText(appinfo.applicationName);
        holder.imgIcon.setImageDrawable(appinfo.icon);
       // holder.chkSelect.setChecked(true);
        holder.chkSelect.setTag(position);
        holder.chkSelect.setChecked(mCheckStates.get(position, false));
        holder.chkSelect.setOnCheckedChangeListener(this);
        return row;

    
    public boolean isChecked(int position) 
        return mCheckStates.get(position, false);
    

    public void setChecked(int position, boolean isChecked) 
        mCheckStates.put(position, isChecked);

    

    public void toggle(int position) 
        setChecked(position, !isChecked(position));

    
@Override
public void onCheckedChanged(CompoundButton buttonView,
        boolean isChecked) 

     mCheckStates.put((Integer) buttonView.getTag(), isChecked);    


static class AppInfoHolder

    ImageView imgIcon;
    TextView txtTitle;
    CheckBox chkSelect;

这是快照

【讨论】：

如果您只检查最后一个，它是否显示该项目 toast ？

@RanjitPati 这是一个工作代码。这没有问题。如果您有问题，请发布新问题而不是评论。如果没有看到代码，我无法猜测或建议出了什么问题

你能告诉你在哪里使用toggle吗？

@Raghunandan 在上面的代码中没有被调用:)

CompoundButton 类型中的方法 setOnCheckedChangeListener(CompoundButton.OnCheckedChangeListener) 不适用于在此行上出现此错误的参数 (CacheBoostAdapter) deleteBox.setOnCheckedChangeListener(this);

【参考方案2】：

这是一个简化但很容易... 您需要将可聚焦标志添加到复选框，如前所述。 您还需要添加可点击标志，如下所示：

android:focusable="false"
android:clickable="false"

您可以从ListView（在我的情况下为ListFragment）onListItemClick 事件中控制复选框状态。

这是示例 onListItemClick 方法：

public void onListItemClick(ListView l, View v, int position, long id) 
super.onListItemClick(l, v, position, id);
//Get related checkbox and change flag status..
CheckBox cb = (CheckBox)v.findViewById(R.id.rowDone);
cb.setChecked(!cb.isChecked());
Toast.makeText(getActivity(), "Click item", Toast.LENGTH_SHORT).show();

【讨论】：

在这种情况下，Lollipop 及更高版本的动画效果会消失

【参考方案3】：

您必须在列表视图中添加一个 OnItemClickListener 以确定单击了哪个项目，然后找到复选框。

mListView.setOnItemClickListener(new OnItemClickListener()

    @Override
    public void onItemClick(AdapterView<?> parent, View v, int position, long id)
    
        CheckBox cb = (CheckBox) v.findViewById(R.id.checkbox_id);
    
);

【参考方案4】：

我有类似的问题。提供的 xml 示例作为单个 ListViewItem 放置，我无法单击 Item 本身，但复选框正在工作。

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="horizontal" android:layout_
    android:layout_
    android:id="@+id/source_container"
    >
    <ImageView
        android:layout_
        android:layout_
        android:id="@+id/menu_source_icon"
        android:background="@drawable/bla"
        android:layout_margin="5dp"
        />
    <TextView
        android:layout_
        android:layout_
        android:id="@+id/menu_source_name"
        android:text="Test"
        android:textScaleX="1.5"
        android:textSize="20dp"
        android:padding="8dp"
        android:layout_weight="1"
        android:layout_gravity="center_vertical"
        android:textColor="@color/source_text_color"/>
    <CheckBox
        android:layout_
        android:layout_
        android:id="@+id/menu_source_check_box"/>

</LinearLayout>

解决方案：添加属性

android:focusable="false"

到 CheckBox 控件。

【参考方案5】：

使复选框不可聚焦，并在列表项上单击执行此操作， 这里codevalue是位置。

    Arraylist<Integer> selectedschools=new Arraylist<Integer>();

    lvPickSchool.setOnItemClickListener(new AdapterView.OnItemClickListener() 
  

   @Override
        public void onItemClick(AdapterView<?> parent, View view, int codevalue, long id)
   
                      CheckBox cb = (CheckBox) view.findViewById(R.id.cbVisitingStatus);

            cb.setChecked(!cb.isChecked());
            if(cb.isChecked())
            

                if(!selectedschool.contains(codevaule))
                
                    selectedschool.add(codevaule);
                
            
            else
            
                if(selectedschool.contains(codevaule))
                
                    selectedschool.remove(codevaule);
                
            
        
    );

【参考方案6】：

[带复选框的自定义 ListView]

如果customlayout使用checkbox，则必须设置checkbox focusable = false

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
  android:orientation="vertical"
  android:layout_
  android:layout_>

  <TextView android:id="@+id/rowTextView" 
    android:layout_ 
    android:layout_
    android:padding="10dp"
    android:textSize="16sp" >
  </TextView>

  <CheckBox android:id="@+id/CheckBox01" 
    android:layout_ 
    android:layout_ 
    android:padding="10dp"
    android:layout_alignParentRight="true" 
    android:layout_marginRight="6sp"
    android:focusable="false">           // <---important
  </CheckBox>

</RelativeLayout>

阅读更多：A ListView with Checkboxes (Without Using ListActivity)

【参考方案7】：

“复选框的用途是确定我选择了Listview中的什么Item”

只需使用 Adapter 类中的 setTag() 方法将标签添加到复选框。另一方使用 getTag() 方法。

      @Override
   public void onBindViewHolder(MyViewHolder holder, int position) 

ServiceHelper helper=userServices.get(position);
holder.tvServiceName.setText(helper.getServiceName());

if(!helper.isServiceStatus())

    holder.btnAdd.setVisibility(View.VISIBLE);
    holder.btnAdd.setTag(helper.getServiceName());
    holder.checkBoxServiceStatus.setVisibility(View.INVISIBLE);

else

    holder.checkBoxServiceStatus.setVisibility(View.VISIBLE);
       //This Line
    holder.checkBoxServiceStatus.setTag(helper.getServiceName());
    holder.btnAdd.setVisibility(View.INVISIBLE);

   

在复选框的 xml 代码中，只需输入“android:onClick="your method""属性即可。

     <CheckBox
            android:layout_
            android:layout_
            android:onClick="checkboxClicked"  
            android:id="@+id/checkBox_Service_row"
            android:layout_marginRight="5dp"
            android:layout_alignParentTop="true"
            android:layout_alignParentRight="true"
            android:layout_alignParentEnd="true" />

在你的类中实现那个方法“你的方法”。

     protected void checkboxClicked(View view)
      

        CheckBox checkBox=(CheckBox) view;
          String tagName="";
         if(checkBox.isChecked())
           tagName=checkBox.getTag().toString();
           deleteServices.add(tagName);
           checkboxArrayList.add(checkBox);
        else 
               checkboxArrayList.remove(checkBox);
               tagName=checkBox.getTag().toString();
                    if(deleteServices.size()>0&&deleteServices.contains(tagName))
 deleteServices.remove(tagName);
    
  

【参考方案8】：

完整参考存在于：listview with checkbox android studio 将所选项目传递给下一个活动

主要源码如下。

先创建一个模型类

public class Model 

    private boolean isSelected;
    private String animal;

    public String getAnimal() 
        return animal;
    

    public void setAnimal(String animal) 
        this.animal = animal;
    

    public boolean getSelected() 
        return isSelected;
    

    public void setSelected(boolean selected) 
        isSelected = selected;
    

然后在适配器类中，将标签设置为复选框。在复选框的 onclicklistener 中使用这些标签。

public class CustomAdapter  extends BaseAdapter 

    private Context context;
    public static ArrayList<Model> modelArrayList;


    public CustomAdapter(Context context, ArrayList<Model> modelArrayList) 

        this.context = context;
        this.modelArrayList = modelArrayList;

    

    @Override
    public int getViewTypeCount() 
        return getCount();
    
    @Override
    public int getItemViewType(int position) 

        return position;
    

    @Override
    public int getCount() 
        return modelArrayList.size();
    

    @Override
    public Object getItem(int position) 
        return modelArrayList.get(position);
    

    @Override
    public long getItemId(int position) 
        return 0;
    

    @Override
    public View getView(int position, View convertView, ViewGroup parent) 
        final ViewHolder holder;

        if (convertView == null) 
            holder = new ViewHolder(); LayoutInflater inflater = (LayoutInflater) context
                    .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            convertView = inflater.inflate(R.layout.lv_item, null, true);

            holder.checkBox = (CheckBox) convertView.findViewById(R.id.cb);
            holder.tvAnimal = (TextView) convertView.findViewById(R.id.animal);

            convertView.setTag(holder);
        else 
            // the getTag returns the viewHolder object set as a tag to the view
            holder = (ViewHolder)convertView.getTag();
        


        holder.checkBox.setText("Checkbox "+position);
        holder.tvAnimal.setText(modelArrayList.get(position).getAnimal());

        holder.checkBox.setChecked(modelArrayList.get(position).getSelected());

        holder.checkBox.setTag(R.integer.btnplusview, convertView);
        holder.checkBox.setTag( position);
        holder.checkBox.setOnClickListener(new View.OnClickListener() 
            @Override
            public void onClick(View v) 

                View tempview = (View) holder.checkBox.getTag(R.integer.btnplusview);
                TextView tv = (TextView) tempview.findViewById(R.id.animal); 
                Integer pos = (Integer)  holder.checkBox.getTag();
                Toast.makeText(context, "Checkbox "+pos+" clicked!", Toast.LENGTH_SHORT).show();

                if(modelArrayList.get(pos).getSelected())
                    modelArrayList.get(pos).setSelected(false);
                else 
                    modelArrayList.get(pos).setSelected(true);
                

            
        );

        return convertView;
    

    private class ViewHolder 

        protected CheckBox checkBox;
        private TextView tvAnimal;

    

【参考方案9】：

您可以使用 model 类并使用 setTag() getTag() 方法来跟踪列表视图中的哪些项目已检查，哪些未检查.

更多参考：listview with checkbox in android

模型源代码

public class Model 

    private boolean isSelected;
    private String animal;

    public String getAnimal() 
        return animal;
    

    public void setAnimal(String animal) 
        this.animal = animal;
    

    public boolean getSelected() 
        return isSelected;
    

    public void setSelected(boolean selected) 
        isSelected = selected;
    

将其放入您的自定义适配器中

 holder.checkBox.setTag(R.integer.btnplusview, convertView);
        holder.checkBox.setTag( position);
        holder.checkBox.setOnClickListener(new View.OnClickListener() 
            @Override
            public void onClick(View v) 

                View tempview = (View) holder.checkBox.getTag(R.integer.btnplusview);
                TextView tv = (TextView) tempview.findViewById(R.id.animal); 
                Integer pos = (Integer)  holder.checkBox.getTag();
                Toast.makeText(context, "Checkbox "+pos+" clicked!", Toast.LENGTH_SHORT).show();

                if(modelArrayList.get(pos).getSelected())
                    modelArrayList.get(pos).setSelected(false);
                else 
                    modelArrayList.get(pos).setSelected(true);
                

            
        );

customAdapter 的完整代码是

public class CustomAdapter  extends BaseAdapter 

    private Context context;
    public static ArrayList<Model> modelArrayList;


    public CustomAdapter(Context context, ArrayList<Model> modelArrayList) 

        this.context = context;
        this.modelArrayList = modelArrayList;

    

    @Override
    public int getViewTypeCount() 
        return getCount();
    
    @Override
    public int getItemViewType(int position) 

        return position;
    

    @Override
    public int getCount() 
        return modelArrayList.size();
    

    @Override
    public Object getItem(int position) 
        return modelArrayList.get(position);
    

    @Override
    public long getItemId(int position) 
        return 0;
    

    @Override
    public View getView(int position, View convertView, ViewGroup parent) 
        final ViewHolder holder;

        if (convertView == null) 
            holder = new ViewHolder(); LayoutInflater inflater = (LayoutInflater) context
                    .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            convertView = inflater.inflate(R.layout.lv_item, null, true);

            holder.checkBox = (CheckBox) convertView.findViewById(R.id.cb);
            holder.tvAnimal = (TextView) convertView.findViewById(R.id.animal);

            convertView.setTag(holder);
        else 
            // the getTag returns the viewHolder object set as a tag to the view
            holder = (ViewHolder)convertView.getTag();
        


        holder.checkBox.setText("Checkbox "+position);
        holder.tvAnimal.setText(modelArrayList.get(position).getAnimal());

        holder.checkBox.setChecked(modelArrayList.get(position).getSelected());

        holder.checkBox.setTag(R.integer.btnplusview, convertView);
        holder.checkBox.setTag( position);
        holder.checkBox.setOnClickListener(new View.OnClickListener() 
            @Override
            public void onClick(View v) 

                View tempview = (View) holder.checkBox.getTag(R.integer.btnplusview);
                TextView tv = (TextView) tempview.findViewById(R.id.animal); 
                Integer pos = (Integer)  holder.checkBox.getTag();
                Toast.makeText(context, "Checkbox "+pos+" clicked!", Toast.LENGTH_SHORT).show();

                if(modelArrayList.get(pos).getSelected())
                    modelArrayList.get(pos).setSelected(false);
                else 
                    modelArrayList.get(pos).setSelected(true);
                

            
        );

        return convertView;
    

    private class ViewHolder 

        protected CheckBox checkBox;
        private TextView tvAnimal;