android - 在 recyclerview 中滚动时复选框更改状态

Question

我制作了一个小应用程序，它显示了我手机上安装的所有应用程序的列表我想在每个卡片 View 中添加一个复选框，以便我可以标记我最喜欢的应用程序和其他分类。问题是当滚动列表时，复选框的状态会发生变化。我检查了 chrome，当我向下滚动然后向上滚动时，chrome 没有标记，随机应用程序被选中。我搜索了与此问题相关的其他问题，但这些解决方案都不适合我。

appsadapter.java 的更新版本

 public class AppsAdapter extends RecyclerView.Adapter<AppsAdapter.ViewHolder>{
private final SparseBooleanArray array=new SparseBooleanArray();

public class ViewHolder extends RecyclerView.ViewHolder{

    public CardView cardView;
    public ImageView imageView;
    public TextView textView_App_Name;
    public CheckBox checkBox;

    public ViewHolder (View view){

        super(view);
        checkBox = (CheckBox) view.findViewById(R.id.chckbox);
        cardView = (CardView) view.findViewById(R.id.card_view);
        imageView = (ImageView) view.findViewById(R.id.imageview);
        textView_App_Name = (TextView) view.findViewById(R.id.Apk_Name);
        //textView_App_Package_Name = (TextView) view.findViewById(R.id.Apk_Package_Name);

    }
}

private Context context1;
private List<String> stringList;

public AppsAdapter(Context context, List<String> list){

    context1 = context;
    stringList = list;
}

//viewholder initialized
@Override
public AppsAdapter.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType){

    View view2 = LayoutInflater.from(context1).inflate(R.layout.cardview_layout,parent,false);
    ViewHolder viewHolder = new ViewHolder(view2);
    return viewHolder;
}

//DATA IS BOUND TO VIEWS
private SparseBooleanArray sba = new SparseBooleanArray();
@Override
public void onBindViewHolder(ViewHolder viewHolder,final int position){

    viewHolder.setIsRecyclable(false);
    ApkInfoExtractor apkInfoExtractor = new ApkInfoExtractor(context1);
    final String ApplicationPackageName = (String) stringList.get(position);

    //calling apps name and icon
    String ApplicationLabelName = apkInfoExtractor.GetAppName(ApplicationPackageName);
    Drawable drawable = apkInfoExtractor.getAppIconByPackageName(ApplicationPackageName);

    //setting app name and icon for every card
    viewHolder.textView_App_Name.setText(ApplicationLabelName);
    viewHolder.imageView.setImageDrawable(drawable);
    viewHolder.itemView.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            sba.put(position, !sba.get(position));
            notifyDataSetChanged();
        }
    });
    viewHolder.checkBox.setChecked(sba.get(position));


    /*Adding click listener on CardView to open clicked application directly from here
    viewHolder.cardView.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {

            Intent intent = context1.getPackageManager().getLaunchIntentForPackage(ApplicationPackageName);
            if(intent != null){
                context1.startActivity(intent);
            }
            else {
                Toast.makeText(context1,ApplicationPackageName + " Error, Please Try Again.", Toast.LENGTH_LONG).show();
            }
        }
    });*/
}

@Override
public int getItemCount(){
    return stringList.size();
}

Answer 1

那是因为在回收者 View 中，项目 View 被重新使用来显示新数据。您必须在数据项中添加一个变量，用于保存特定位置复选框的状态。然后在 onBindViewHolder 中，您可以检查跟踪变量的值并设置复选框的状态，如 yourCheckbox.setchecked(item.getSelected()) 设置跟踪变量值在 onCheckChanged 方法中