选中listview中的复选框也会检查其他随机复选框

Question

每当我检查列表视图中的复选框时,其他随机复选框也会被检查.这可能是由于listview的物品回收.

我也尝试android:focusable="false"按照某些地方的建议在我的布局中设置复选框,但是当选中其复选框时,仍然没有为行调用onListItemClick().只有当我点击其他地方时才会调用它.

我想要的是只有用户选中的复选框应保持检查,直到用户取消选中它们.

我在下面给出完整的代码,可以直接运行.

活动代码 - ProjActivity.java:

public class ProjActivity extends ListActivity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    PackageManager pm = getPackageManager();
    List<ApplicationInfo> packages = pm.getInstalledApplications(PackageManager.GET_META_DATA);

    final CopyOfMyCustomAdapter a = new CopyOfMyCustomAdapter(this, packages);
    getListView().setAdapter(a);
}}

最后,自定义布局文件 - testlayout.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal" 

>

<CheckBox
    android:id="@+id/checkBox1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="20dp"
    android:text="CheckBox" 
    android:focusable="false"
    />

<ImageView
    android:id="@+id/imageView1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:src="@drawable/ic_launcher" 
    android:focusable="false"
    />

更新:我的CustomAdapter在以下答案中的建议之后:

public class MyCustomAdapter extends ArrayAdapter<ApplicationInfo>  {

private List<ApplicationInfo> appInfoList;
private LayoutInflater mInflater;
private PackageManager pm;
ArrayList<Boolean> positionArray;
private Context ctx;
int[] visiblePosArray;
private volatile int positionCheck; 

public MyCustomAdapter(Context context, List<ApplicationInfo> myList) {
    super(context, NO_SELECTION);
    appInfoList = myList;
    ctx=context;
    mInflater =     (LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    pm = context.getPackageManager();

    positionArray = new ArrayList<Boolean>(myList.size());
    for(int i =0;i<myList.size();i++){
        positionArray.add(false);
    }
}
@Override
public int getCount() {
    // TODO Auto-generated method stub
    return appInfoList.size();
}

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

    View row = convertView;
    Holder holder = null;

    if(row==null){
        row = mInflater.inflate(R.layout.testlayout, null); 
        //  visiblePosArray[position%visiblePosArray.length]=position;
        holder = new Holder();
        holder.appIcon = (ImageView)row.findViewById(R.id.imageView1);

        holder.ckbox =(CheckBox)row.findViewById(R.id.checkBox1);

        row.setTag(holder);
    } else {

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

    holder.ckbox.setFocusable(false);
    holder.appIcon.setImageDrawable(appInfoList.get(position).loadIcon(pm));
    holder.ckbox.setChecked(positionArray.get(position));
    holder.ckbox.setText(appInfoList.get(position).loadLabel(pm));
    holder.ckbox.setOnCheckedChangeListener(new OnCheckedChangeListener() {

        @Override
        public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
            if(isChecked ){
            System.out.println(position+"--- :)");
                positionArray.add(position, true);
            }else
                positionArray.add(position, false);
        }
    });

    return row;
}
static class Holder
{
    ImageView appIcon;
    CheckBox ckbox;

}

}

当我向上和向下滚动时,我可以在syso中看到随机索引在我的布尔Arraylist中变为true.

Answer 1

当listview回收视图时,它会回收它的当前状态以及附加到它的侦听器.在我的示例中,如果选中了复选框并且设置了onCheckedChangeListener,则两者都将基于位置保留为循环视图的一部分.因此,我们有责任重置所有状态并删除以前的侦听器.

因此,当我取消选中循环视图时,onCheckedChange监听器正在执行.一行使程序完美运行.听众被删除:

holder.ckbox.setOnCheckedChangeListener(null); 

以下是适用于可能偶然发现此问题的人的适用工具代码:

public class MyCustomAdapter extends ArrayAdapter<ApplicationInfo>  {

private List<ApplicationInfo> appInfoList;
private LayoutInflater mInflater;
private PackageManager pm;
ArrayList<Boolean> positionArray;
private Context ctx;
int[] visiblePosArray;
private volatile int positionCheck; 

public MyCustomAdapter(Context context, List<ApplicationInfo> myList) {
    super(context, NO_SELECTION);
    appInfoList = myList;
    ctx=context;
    mInflater =     (LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    pm = context.getPackageManager();

    positionArray = new ArrayList<Boolean>(myList.size());
    for(int i =0;i<myList.size();i++){
        positionArray.add(false);
    }
}
@Override
public int getCount() {
    // TODO Auto-generated method stub
    return appInfoList.size();
}

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

    View row = convertView;
    Holder holder = null;

    if(row==null){
        row = mInflater.inflate(R.layout.testlayout, null); 
        //  visiblePosArray[position%visiblePosArray.length]=position;
        holder = new Holder();
        holder.appIcon = (ImageView)row.findViewById(R.id.imageView1);

        holder.ckbox =(CheckBox)row.findViewById(R.id.checkBox1);

        row.setTag(holder);
    } else {

        holder = (Holder) convertView.getTag();
    holder.ckbox.setOnCheckedChangeListener(null);

    }

    holder.ckbox.setFocusable(false);
    holder.appIcon.setImageDrawable(appInfoList.get(position).loadIcon(pm));
    holder.ckbox.setChecked(positionArray.get(position));
    holder.ckbox.setText(appInfoList.get(position).loadLabel(pm));
    holder.ckbox.setOnCheckedChangeListener(new OnCheckedChangeListener() {

        @Override
        public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
            if(isChecked ){
            System.out.println(position+"--- :)");
                positionArray.set(position, true);

            }else
                positionArray.set(position, false);
        }
    });

    return row;
}
static class Holder
{
    ImageView appIcon;
    CheckBox ckbox;

}

}

Answer 2

您需要跟踪检查状态,因为ListView重新使用了Views.因此,先前启用/禁用的位置1的状态可能与位置7一样.

所以你需要做的是将检查状态保持在数组boolean或任何你喜欢的状态.

采用类级别boolean [] checkedState;在构造函数中初始化它,根据您的数据数组大小,您也可以使用ArrayList<Boolean>动态大小.

无论何时选中或取消选中,都设置OnStateChangeListener为CheckBoxesin getView(),取位置并将其保存在如下数组中checkedState:

checkedState[position] = false;// or true accordingly

当为Viewlike TextView或ImageView任何特定位置设置其他数据时,也相应地设置检查状态,如下所示:

holder.appIcon.setImageDrawable(appInfoList.get(position).loadIcon(pm));
holder.ckbox.setChecked(checkedState[position]);

一个很好的解释和例子:

Android自定义图片库,网格中的复选框可选择多个

编辑:实际上发生了什么,你的位置是越野车,解决这个添加这些线:

holder.ckbox.setText(appInfoList.get(position).loadLabel(pm));
holder.ckbox.setTag(String.valueOf(position));   // to properly track the actual position
holder.ckbox.setOnCheckedChangeListener(new OnCheckedChangeListener() {
      @Override
      public void onCheckedChanged(CompoundButton v, boolean isChecked) {
            int pos = Integer.parseInt( v.getTag().toString()) ; //to take the actual position
            positionArray.add(pos, isChecked);  // we don't need to check whether it is true or false, however you can put if-else to debug the app.

      }
});

Answer 3

这两种方法的组合对我有用:

我在类级别上有一个布尔数组,用于跟踪复选框的值.

boolean [] checkedItems = new boolean[listItems.size()];

在getView()中:

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

        if (convertView == null) {

            convertView = inflater.inflate(R.layout.menu_item_list_item,
                    parent, false);

            holder = new ViewHolder();

            holder.name = (TextView) convertView
                    .findViewById(R.id.menuItemLargeName);
            holder.mainItemCheckBox = (CheckBox) convertView
                    .findViewById(R.id.menuItemLargeCheckBox);

            convertView.setTag(holder);
        } else {
            holder = (ViewHolder) convertView.getTag();
            // remove the listener so that it does not get attached to other chechboxes. 
            holder.mainItemCheckBox.setOnCheckedChangeListener(null);
            //update the checkbox value from boolean array
            holder.mainItemCheckBox.setChecked(checkedItems[position]);
        }


        holder.name.setText(listItems.get(position).getName());

        holder.mainItemCheckBox
                .setOnCheckedChangeListener(onCheckedListener);
        holder.mainItemCheckBox
                .setTag(R.id.menuItemLargeCheckBox, position);

        return (convertView);
    }

在我的OnCheckedChangeListener()中:更新布尔数组.

    OnCheckedChangeListener onCheckedListener = new OnCheckedChangeListener() {

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

        int position = (Integer) buttonView
                .getTag(R.id.menuItemLargeCheckBox);

        MenuItemObject menuItem = listItems.get(position);

        if (isChecked) {

            cartItems.add(menuItem);
            checkedItems[position] = true;

        } else {

            cartItems.remove(menuItem);
            checkedItems[position] = false;
        }


    }
};