滚动“自定义列表视图”后取消选中复选框...！

Question

我创建自定义列表视图，并在其中添加复选框。
首先，我选中所有复选框，然后向下滚动列表视图，然后选中“未选中”复选框。
我该怎么办？
CustomListItem.java

package com.example.customlistviewdemo;

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

public class CustomListItem extends ArrayAdapter<String> {

    private final Activity context;
    private final String[] TitleArray;
    private final String[] SubTitlearray;
    private final String[] TimeArray;
    private final Integer[] MainImageId;


    public CustomListItem(Activity context, String[] TitleArray,
            String[] SubTitlearray, String[] TimeArray, Integer[] MainImageId) {
        super(context, R.layout.list_item, TitleArray);
        this.context = context;
        this.TitleArray = TitleArray;

        this.SubTitlearray = SubTitlearray;
        this.TimeArray = TimeArray;
        this.MainImageId = MainImageId;


    }

    @Override
    public View getView(int position, View view, ViewGroup parent) {
        LayoutInflater inflater = context.getLayoutInflater();
        View rowView = inflater.inflate(R.layout.list_item, null, true);
        ImageView animal, car, environment, map1, warning1, map2, warning2, download, share, plant;
        animal = (ImageView) rowView.findViewById(R.id.imgAnimal);
        car = (ImageView) rowView.findViewById(R.id.imgCar);
        environment = (ImageView) rowView.findViewById(R.id.imgEnvironment);
        plant = (ImageView) rowView.findViewById(R.id.imgPlant);
        map1 = (ImageView) rowView.findViewById(R.id.imgMap);
        warning1 = (ImageView) rowView.findViewById(R.id.imgWarning);
        map2 = (ImageView) rowView.findViewById(R.id.imgMap2);
        warning2 = (ImageView) rowView.findViewById(R.id.imgWarining2);
        download = (ImageView) rowView.findViewById(R.id.imgDownload);
        CheckBox chk = (CheckBox) rowView.findViewById(R.id.checkbox);
        share = (ImageView) rowView.findViewById(R.id.imgShare);

        animal.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                Toast.makeText(getContext(), "Animal ImageView is Clicked",
                        5000).show();
                // TODO Auto-generated method stub

            }
        });
        car.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                Toast.makeText(getContext(), "Cars ImageView is Clicked", 5000)
                        .show();
                // TODO Auto-generated method stub

            }
        });
        environment.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                Toast.makeText(getContext(),
                        "environment ImageView is Clicked", 5000).show();
                // TODO Auto-generated method stub

            }
        });
        ------------------------------------------------------------------
                      ...........................SO on............................
                        ..........................................................

        TextView mainTitle = (TextView) rowView.findViewById(R.id.txtMainTitle);
        ImageView mainImage = (ImageView) rowView
                .findViewById(R.id.imgMainImage);

        TextView SubText = (TextView) rowView.findViewById(R.id.txtSubTitle);
        TextView TimeText = (TextView) rowView.findViewById(R.id.txtTimeTitle);

        mainTitle.setText(TitleArray[position]);
        SubText.setText(SubTitlearray[position]);
        TimeText.setText(TimeArray[position]);
        mainImage.setImageResource(MainImageId[position]);

        return rowView;
    }
}

ActivityMain.java

package com.example.customlistviewdemo;

import android.app.Activity;
import android.os.Bundle;
import android.widget.ListView;

public class MainActivity extends Activity {
    ListView list;
    String[] TitleArray = { "Testing Title1. This is MainTitle",
            "Testing Title2. This is MainTitle",
            "Testing Title3. This is MainTitle",
            "Testing Title4. This is MainTitle",
            "Testing Title5. This is MainTitle",
            "Testing Title6. This is MainTitle" };
    String[] SubTitleArray = { "Reported by Man 1", "Reported by Man 2",
            "Reported by Man 3", "Reported by Man 4", "Reported by Man 5",
            "Reported by Man 6" };

    String[] TimeArray = { "about 1 hour ago", "about 2 hour ago",
            "about 3 hour ago", "about 4 hour ago", "about 5 hour ago",
            "about 6 hour ago" };

    Integer[] MainImageId = { R.drawable.android1, R.drawable.android2,
            R.drawable.android3, R.drawable.android4, R.drawable.android5,
            R.drawable.android6 };



    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        CustomListItem adapter = new CustomListItem(MainActivity.this,
                TitleArray, SubTitleArray, TimeArray, MainImageId);
        list = (ListView) findViewById(R.id.listView1);
        list.setAdapter(adapter);

    }
}

list_item.xml

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

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginBottom="10dp" >

        <TextView
            android:id="@+id/txtMainTitle"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:text="This is Sample Text"
            android:textAppearance="?android:attr/textAppearanceLarge" />
    </LinearLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical" >
    </LinearLayout>

    <LinearLayout
        android:layout_width="fill_parent"
        android:layout_height="130dp" >

        <LinearLayout
            android:layout_width="150dp"
            android:layout_height="wrap_content"
            android:paddingRight="15dp" >

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

            <ImageView
                android:id="@+id/imgMainImage"
                android:layout_width="100dp"
                android:layout_height="fill_parent" />
        </LinearLayout>

        <LinearLayout
            android:layout_width="fill_parent"
            android:layout_height="fill_parent"
            android:orientation="vertical" >

            <TextView
                android:id="@+id/txtSubTitle"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginBottom="5dp"
                android:text="This is Sample Text"
                android:textAppearance="?android:attr/textAppearanceSmall"
                android:textSize="16dp" />

            <TextView
                android:id="@+id/txtTimeTitle"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="This is Sample Text"
                android:textAppearance="?android:attr/textAppearanceSmall"
                android:textSize="12dp" />

            <HorizontalScrollView
                android:id="@+id/scrollView1"
                android:layout_width="fill_parent"
                android:layout_height="wrap_content"
                android:scrollbars="none" >

                <LinearLayout
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:layout_marginBottom="8dp"
                    android:layout_marginTop="8dp" >

                    <ImageView
                        android:id="@+id/imgAnimal"
                        android:layout_width="25dp"
                        android:layout_height="25dp"
                        android:layout_marginRight="10dp"
                        android:src="@drawable/channel_animal" />

                    <ImageView
                        android:id="@+id/imgCar"
                        android:layout_width="25dp"
                        android:layout_height="25dp"
                        android:layout_marginRight="10dp"
                        android:src="@drawable/channel_car" />

                    <ImageView
                        android:id="@+id/imgEnvironment"
                        android:layout_width="25dp"
                        android:layout_height="25dp"
                        android:layout_marginRight="10dp"
                        android:src="@drawable/channel_environment" />

                    <ImageView
                        android:id="@+id/imgPlant"
                        android:layout_width="25dp"
                        android:layout_height="25dp"
                        android:layout_marginRight="10dp"
                        android:src="@drawable/channel_plant" />

                    <ImageView
                        android:id="@+id/imgMap"
                        android:layout_width="25dp"
                        android:layout_height="25dp"
                        android:layout_marginRight="10dp"
                        android:src="@drawable/tab_icon_map" />

                    <ImageView
                        android:id="@+id/imgWarning"
                        android:layout_width="25dp"
                        android:layout_height="25dp"
                        android:layout_marginRight="10dp"
                        android:src="@drawable/warning_icon" />
                </LinearLayout>
            </HorizontalScrollView>

            <HorizontalScrollView
                android:id="@+id/scrollView2"
                android:layout_width="fill_parent"
                android:layout_height="wrap_content"
                android:scrollbars="none" >

                <LinearLayout
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content" >

                    <ImageView
                        android:id="@+id/imgMap2"
                        android:layout_width="30dp"
                        android:layout_height="30dp"
                        android:layout_marginRight="10dp"
                        android:src="@drawable/tab_icon_map" />

                    <ImageView
                        android:id="@+id/imgWarining2"
                        android:layout_width="30dp"
                        android:layout_height="30dp"
                        android:layout_marginRight="10dp"
                        android:src="@drawable/warning_icon" />

                    <ImageView
                        android:id="@+id/imgDownload"
                        android:layout_width="30dp"
                        android:layout_height="30dp"
                        android:layout_marginRight="10dp"
                        android:src="@drawable/download_icon" />

                    <ImageView
                        android:id="@+id/imgShare"
                        android:layout_width="30dp"
                        android:layout_height="30dp"
                        android:layout_marginRight="10dp"
                        android:src="@drawable/share_icon" />
                </LinearLayout>
            </HorizontalScrollView>
        </LinearLayout>
    </LinearLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content" >

        <View
            android:id="@+id/view"
            android:layout_width="match_parent"
            android:layout_height="1dp"
            android:layout_toRightOf="@+id/text1"
            android:background="#FF9900" />
    </LinearLayout>

</LinearLayout>

Answer 1

我希望像这样的体系结构那样修改您的适配器类，我希望它能起作用：重要的几行是设置标签和获取标签。

public class MyAdapter extends ArrayAdapter<Model> {

    private final List<Model> list;
    private final Activity context;
    boolean checkAll_flag = false;
    boolean checkItem_flag = false;

    public MyAdapter(Activity context, List<Model> list) {
        super(context, R.layout.row, list);
        this.context = context;
        this.list = list;
    }

    static class ViewHolder {
        protected TextView text;
        protected CheckBox checkbox;
    }

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

        ViewHolder viewHolder = null;
        if (convertView == null) {
            LayoutInflater inflator = context.getLayoutInflater();
            convertView = inflator.inflate(R.layout.row, null);
            viewHolder = new ViewHolder();
            viewHolder.text = (TextView) convertView.findViewById(R.id.label);
            viewHolder.checkbox = (CheckBox) convertView
                    .findViewById(R.id.check);
            viewHolder.checkbox
                    .setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {

                        @Override
                        public void onCheckedChanged(CompoundButton buttonView,
                                boolean isChecked) {
                            int getPosition = (Integer) buttonView.getTag(); // Here
                                // we get  the position that we have set for the checkbox using setTag.
                            list.get(getPosition).setSelected(
                                    buttonView.isChecked()); // Set the value of
                                                                // checkbox to
                                                                // maintain its
                                                                // state.
                        }
                    });
            convertView.setTag(viewHolder);
            convertView.setTag(R.id.label, viewHolder.text);
            convertView.setTag(R.id.check, viewHolder.checkbox);
        } else {
            viewHolder = (ViewHolder) convertView.getTag();
        }
        viewHolder.checkbox.setTag(position); // This line is important.

        viewHolder.text.setText(list.get(position).getName());
        viewHolder.checkbox.setChecked(list.get(position).isSelected());

        return convertView;
    }
}

Answer 2

当您在ListView中使用CheckBox时， ListView存在一个问题，即Android无法维护CheckBox的Checked state ，因为当您Scroll ListView ，它将使用getView()方法为每一行生成新的View ，并且Garbage Collector将删除所有上面的内容View以腾出空间，以便CheckBox状态也将被Garbage Collector破坏或Garbage Collector 。 您可以通过以下示例解决此问题：

main.xml中

<relativelayout 
    android:layout_height="match_parent" 
     android:layout_width="match_parent" 
     tools:context=".Main" 
     xmlns:android="http://schemas.android.com/apk/res/android" 
     xmlns:tools="http://schemas.android.com/tools">

    <listview 
           android:divider="#000" 
           android:dividerheight="0.8dp"
           android:id="@+id/listView1" 
           android:layout_alignparentleft="true" 
           android:layout_alignparenttop="true" 
           android:layout_height="match_parent" 
           android:layout_width="match_parent">
    </listview>

    <button 
           android:id="@+id/button1" 
           android:layout_alignparenttop="true" 
           android:layout_centerhorizontal="true" 
           android:layout_height="wrap_content" 
           android:layout_width="match_parent" 
           android:text="Check Selected">

    </button>
</relativelayout>

list_item.xml

<relativelayout 
      android:layout_height="match_parent" 
      android:layout_width="match_parent" 
      xmlns:android="http://schemas.android.com/apk/res/android">

      <textview 
            android:id="@+id/textView1" 
            android:layout_alignparentleft="true" 
            android:layout_alignparenttop="true"
            android:layout_height="wrap_content" 
            android:layout_marginbottom="10dp" 
            android:layout_margintop="10dp" 
            android:layout_width="wrap_content"  
            android:text="Medium Text" 
            android:textappearance="?android:attr/textAppearanceMedium">
     </textview>

     <checkbox
            android:focusable="false" 
            android:focusableintouchmode="false" 
            android:id="@+id/checkBox1"
            android:layout_alignbaseline="@+id/textView1" 
            android:layout_alignbottom="@+id/textView1" 
            android:layout_alignparentright="true" 
            android:layout_height="wrap_content" 
            android:layout_marginright="16dp" 
            android:layout_width="wrap_content">

    </checkbox>
 </relativelayout>

Main.java

import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;

import android.app.Activity;
import android.content.pm.ApplicationInfo;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.os.Bundle;
import android.view.Menu;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;

public class Main extends Activity implements OnItemClickListener{

 ListView apps;
 PackageManager packageManager;
 ArrayList <String> checkedValue;
 Button bt1;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        bt1 = (Button) findViewById(R.id.button1);
        apps = (ListView) findViewById(R.id.listView1);
        packageManager = getPackageManager();
  final List <PackageInfo> packageList = packageManager
    .getInstalledPackages(PackageManager.GET_META_DATA); // all apps in the phone
  final List <PackageInfo> packageList1 = packageManager
    .getInstalledPackages(0);

    try {
      packageList1.clear();
      for (int n = 0; n < packageList.size(); n++)
      {

       PackageInfo PackInfo = packageList.get(n);
       if (((PackInfo.applicationInfo.flags & ApplicationInfo.FLAG_SYSTEM) != 0) != true)
        //check weather it is system app or user installed app
       {
        try
        {

          packageList1.add(packageList.get(n)); // add in 2nd list if it is user installed app
           Collections.sort(packageList1,new Comparator <PackageInfo>()
             // this will sort App list on the basis of app name
           {
            public int compare(PackageInfo o1,PackageInfo o2)
            {
             return o1.applicationInfo.loadLabel(getPackageManager()).toString()
               .compareToIgnoreCase(o2.applicationInfo.loadLabel(getPackageManager())
                   .toString());// compare and return sorted packagelist.
            }
           });


        } catch (NullPointerException e) {
         e.printStackTrace();
        }
       }
      }
     } catch (Exception e) {
      e.printStackTrace();
     }
    Listadapter Adapter = new Listadapter(this,packageList1, packageManager);
    apps.setAdapter(Adapter);
    apps.setOnItemClickListener(this);
    bt1.setOnClickListener(new View.OnClickListener() {

     @Override
     public void onClick(View v) {
      // TODO Auto-generated method stub
      Toast.makeText(Main.this,"" + checkedValue,Toast.LENGTH_LONG).show();
     }
    });

    }


    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }


 @Override
 public void onItemClick(AdapterView arg0, View v, int position, long arg3) {
  // TODO Auto-generated method stub
  CheckBox cb = (CheckBox) v.findViewById(R.id.checkBox1);
  TextView tv = (TextView) v.findViewById(R.id.textView1);
  cb.performClick();
  if (cb.isChecked()) {

   checkedValue.add(tv.getText().toString());
  } else if (!cb.isChecked()) {
   checkedValue.remove(tv.getText().toString());
  }           
 }         
}

Listadapter.java

import java.util.List;

import android.app.Activity;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.graphics.drawable.Drawable;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.CheckBox;
import android.widget.TextView;

public class Listadapter extends BaseAdapter{

 List <PackageInfo> packageList;
 Activity context;
 PackageManager packageManager;
 boolean[] itemChecked;

 public Listadapter(Activity context, List <PackageInfo> packageList,
   PackageManager packageManager) {
  super();
  this.context = context;
  this.packageList = packageList;
  this.packageManager = packageManager;
  itemChecked = new boolean[packageList.size()];
 }

 private class ViewHolder {
  TextView apkName;
  CheckBox ck1;
 }

 public int getCount() {
  return packageList.size();
 }

 public Object getItem(int position) {
  return packageList.get(position);
 }

 public long getItemId(int position) {
  return 0;
 }

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

  LayoutInflater inflater = context.getLayoutInflater();

  if (convertView == null) {
   convertView = inflater.inflate(R.layout.list_item, null);
   holder = new ViewHolder();

   holder.apkName = (TextView) convertView
     .findViewById(R.id.textView1);
   holder.ck1 = (CheckBox) convertView
     .findViewById(R.id.checkBox1);

   convertView.setTag(holder);

  } else {

   holder = (ViewHolder) convertView.getTag();
  }

  PackageInfo packageInfo = (PackageInfo) getItem(position);

  Drawable appIcon = packageManager
    .getApplicationIcon(packageInfo.applicationInfo);
  String appName = packageManager.getApplicationLabel(
    packageInfo.applicationInfo).toString();
  appIcon.setBounds(0, 0, 40, 40);
  holder.apkName.setCompoundDrawables(appIcon, null, null, null);
  holder.apkName.setCompoundDrawablePadding(15);
  holder.apkName.setText(appName);
  holder.ck1.setChecked(false);

  if (itemChecked[position])
   holder.ck1.setChecked(true);
  else
   holder.ck1.setChecked(false);

  holder.ck1.setOnClickListener(new OnClickListener() {
   @Override
   public void onClick(View v) {
    // TODO Auto-generated method stub
    if (holder.ck1.isChecked())
     itemChecked[position] = true;
    else
     itemChecked[position] = false;
   }
  });

  return convertView;

 }      
}

Answer 3

为什么不使用setOnCheckedChangeListener()来保持/保持每个头寸项目的检查状态？

切记将setChecked() setOnCheckedChangeListener() ，否则将触发先前的ViewHolder对象的setOnCheckedChangeListener() ，从而导致上一项未选中的问题。