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使用列表视图中的复选框获取所选项目

androidlistview
29

我正在创建一个安卓应用程序，其中有一个 ListView，它显示了我手机上安装的所有应用程序。

我的 ListView 是自定义的，包含图标、文本视图和复选框，图标用于显示应用程序的图标，文本视图用于显示应用程序的名称，复选框用于确定我在 ListView 中选择的项目。

当我在应用程序中点击按钮时，如何确定我选择的 ListView 行中的复选框是哪一个？由于我是 Android 新手，不知道应该采取什么方法。

以下是我的代码：

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);

        }


}
你可以使用稀疏布尔数组来实现这个目的。 - Raghunandan
你想在点击按钮时选中行中的复选框吗？因为你的标题说“当我点击按钮时，使用Listview中的复选框获取选定项”。 - Raghunandan
9个回答
34

假设你想在点击按钮时获取选中复选框的行项目。这是基于你标题“当我点击一个按钮，使用Listview中的复选框获取选定项”。的假设。

请尝试以下更改，并仅进行以下更改。保留其余部分不变。

有关此主题的解释和讨论@

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底部带有按钮的ListView

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    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_width="fill_parent"
        android:id="@+id/listApplication"
        android:layout_height="fill_parent"
        android:layout_above="@+id/button1"
        android:text="@string/hello_world" />

    <Button
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        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

在此输入图片描述

如果您只勾选最后一个，它是否会显示该项的提示？ - Ranjit
@RanjitPati 这是一段可行的代码。没有任何问题。如果您有问题，请发布一个新的问题，而不是评论。我无法在没有看到代码的情况下猜测或建议出错了什么。 - Raghunandan
1
请问您在哪里使用了 toggle？ - Bir
1
在类型CompoundButton中，方法setOnCheckedChangeListener(CompoundButton.OnCheckedChangeListener)不适用于参数(CacheBoostAdapter)，我在这一行deleteBox.setOnCheckedChangeListener(this);上遇到了这个错误。 - Erum
请通过提出单独的问题来发布您的代码，@ErumHannan。 - Raghunandan
显示剩余2条评论
16

虽然这只是一种简化方式，但非常容易... 您需要按照之前的说明向复选框添加可聚焦标志。 您还需要添加可点击标志，如下所示：

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

在列表视图(ListFragment in my case)的onListItemClick事件中控制复选框的状态。

以下是示例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();
}
在Lollipop及以上版本中，它会消失动画效果。 - Choletski
9

您需要向列表视图添加 OnItemClickListener 以确定所单击的项，然后查找复选框。

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);
    }
});
2
我遇到了类似的问题。提供的XML样本被放置在单个ListViewItem中，我无法点击项本身，但复选框是可用的。
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="horizontal" android:layout_width="match_parent"
    android:layout_height="50dp"
    android:id="@+id/source_container"
    >
    <ImageView
        android:layout_width="40dp"
        android:layout_height="40dp"
        android:id="@+id/menu_source_icon"
        android:background="@drawable/bla"
        android:layout_margin="5dp"
        />
    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        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_width="40dp"
        android:layout_height="match_parent"
        android:id="@+id/menu_source_check_box"/>

</LinearLayout>

解决方案：添加属性。
android:focusable="false"

转换为复选框控件。

2
使复选框无法获得焦点，在列表项点击时执行以下操作，其中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);
                }
            }
        }
    });
0

复选框的使用是为了确定我在ListView中选择了哪个项目

  1. 在适配器类中使用setTag()方法为复选框添加标签，另一侧使用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);

   }

}

  2. 在复选框的xml代码中，只需添加“android:onClick="your method"”属性。

         <CheckBox
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            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" />

  3. 在您的类中实现该方法“your method”。

         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);
    }
  }
}
0

[带有复选框的自定义ListView]

如果自定义布局使用复选框，必须将复选框设置为不可聚焦

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

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

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

</RelativeLayout>

阅读更多：使用复选框的ListView（不使用ListActivity）

0

完整的参考资料请见：在Android Studio中使用带有复选框的ListView 将所选项目传递到下一个活动

主要源代码如下。

首先创建一个模型类

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;

    }

}
0
你可以使用model类，并使用setTag()和getTag()方法来跟踪哪些列表项被选中，哪些没有被选中。
更多相关信息请参考：在Android中使用复选框的listview 模型的源代码
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;
    }
}

将此代码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);
                }

            }
        });

自定义适配器的完整代码如下：

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;

    }

}
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