RecyclerView Adapter更改列表滚动中的选定位置 [英] RecyclerView Adapter change selected position in List Scrolling

问题描述

在RecyclerView.Adapter中，我需要在每个行列表中更改favIcon，在选择每个位置之后，只需指定行favIcon即可更改.

In RecyclerView.Adapter i need to change favIcon in each row list that after select each position just specified row favIcon change.

一切正常，但是滚动RecyclerView时，所选行的位置会自动更改！

All thing is right but when scroll RecyclerView , position of selected row change automatically!

这是我的适配器类:

public class MyAdapter extends RecyclerView.Adapter<MyAdapter.ViewHolder> {
private ItemData[] itemsData;
Activity activity;

public MyAdapter(Activity activity, ItemData[] itemsData) {
    this.activity=activity;
    this.itemsData = itemsData;
}

@Override
public MyAdapter.ViewHolder onCreateViewHolder(ViewGroup parent,
                                               int viewType) {
    View itemLayoutView = LayoutInflater.from(parent.getContext())
            .inflate(R.layout.item_layout, null);

    ViewHolder viewHolder = new ViewHolder(itemLayoutView);
    return viewHolder;
}

@Override
public void onBindViewHolder(final ViewHolder viewHolder, final int position) {

    viewHolder.txtViewTitle.setText(itemsData[position].getTitle());
    viewHolder.imgViewIcon.setImageResource(itemsData[position].getImageUrl());
    viewHolder.imgViewIcon.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            if (!viewHolder.isFav) {
                Toast.makeText(activity,"Selected Row : "+position,Toast.LENGTH_SHORT).show();
                viewHolder.isFav = true;
                viewHolder.imgViewIcon.setImageResource(R.drawable.icon_fav);
            } else {
                viewHolder.imgViewIcon.setImageResource(R.drawable.pre_ic_ab_drawer);
                viewHolder.isFav = false;
            }
        }
    });


    if (viewHolder.isFav)
        viewHolder.imgViewIcon.setImageResource(R.drawable.icon_fav);

}

public static class ViewHolder extends RecyclerView.ViewHolder {

    public TextView txtViewTitle;
    public ImageView imgViewIcon;
    public Boolean isFav=false;

    public ViewHolder(View itemLayoutView) {
        super(itemLayoutView);
        txtViewTitle = (TextView) itemLayoutView.findViewById(R.id.item_title);
        imgViewIcon = (ImageView) itemLayoutView.findViewById(R.id.item_icon);
    }
}

@Override
public int getItemCount() {
    return itemsData.length;
}
 } 

我在输出中看到的内容:

What I see in the output :

如图所示，我选择了第一行图标，但是在滚动RecyclerView之后，选择了位置更改.

As seen i select first row icon , but after scroll RecyclerView , selected position change.

然后尝试再次在错误的位置使用更改favIcon和imgViewIcon.setOnClickListener的位置！

Then try to use changing favIconand imgViewIcon.setOnClickListener in onCreateViewHolder again wrong position!

我也尝试将位置存储在sharedPreferences或modelClass中，但这在滚动时返回错误的位置

Too i try to store position in sharedPreferences or modelClass , but this return wrong position in scrolling yet

有办法避免这个问题吗?

There is a way to avoid this problem?

我也看到了此解决方案:获得点击的项目并在RecyclerView中的位置

I saw this solution Too :Get clicked item and its position in RecyclerView

推荐答案

如果选择了元素，请尝试使用模型ItemData[] itemsData;保存.

Try to use your model ItemData[] itemsData; to save if element is selected.

例如

        if (itemsData[position].isFav){

                viewHolder.imgViewIcon.setImageResource(R.drawable.icon_fav);
         }else{

                viewHolder.imgViewIcon.setImageResource(R.drawable.pre_ic_ab_drawer);
         }


viewHolder.imgViewIcon.setOnClickListener(new View.OnClickListener() {
                    @Override
                    public void onClick(View v) {
                        if (!itemsData[position].isFav) {
                            Toast.makeText(activity,"Selected Row : "+position,Toast.LENGTH_SHORT).show();
                            itemsData[position].isFav = true;
                            viewHolder.imgViewIcon.setImageResource(R.drawable.icon_fav);
                        } else {
                            viewHolder.imgViewIcon.setImageResource(R.drawable.pre_ic_ab_drawer);
                            itemsData[position].isFav = false;
                        }
                    }
                });

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