我在listview android中滚动期间更改图像 [英] My images changing during scroll in listview android

问题描述

在上周，我只是尝试解决这个问题。看到每个类似的问题，我不知道为什么，解决方案对我不起作用。
我有一个列表视图，每个项目都有一个图像视图。单击图像视图时，我想更改图像资源。好。全做完了。但滚动时，图像资源会发生变化。
我的完整代码是：

In last week, i just try to resolve this problem. see every similar questions and i don't know why, solutions don't work for me. I have a list view and each item has an image view. when clicked on image view , i want to change image resource. well. all done. but when scrolling, image resources change. my full code is:

public class CustomBaseAdapter extends BaseAdapter {

Context context;
ArrayList<String> items;

    public CustomBaseAdapter(Context context,ArrayList<String> items){
        this.context = context;
        this.items = items;
    }

private class ViewHolder{
    TextView titr;
    ImageView image;
}

@Override
public int getCount() {
    return items.size();
}

@Override
public Object getItem(int position) {
    return items.get(position);
}

@Override
public long getItemId(int position) {
    return items.hashCode();
}

@Override
public View getView(int position, View view, ViewGroup parent) {
    View vi = view;
    final ViewHolder holder ;
    LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    if(view==null){

        vi = inflater.inflate(R.layout.customlistitem,null);
        holder = new ViewHolder();
        holder.titr = (TextView) vi.findViewById(R.id.listtext);
        holder.image = (ImageView) vi.findViewById(R.id.listimg);
        holder.image.setTag(position);
        vi.setTag(holder);
    }
    else{
        holder = (ViewHolder) vi.getTag();
    }


    holder.titr.setText(items.get(position));

    holder.image.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
           v.setBackgroundResource(R.drawable.fav_ic);
        }
    });
    return vi;
}

}

哪里有错误？

推荐答案

试试这个，

public class CustomBaseAdapter extends BaseAdapter {

Context context;
ArrayList<Items> items;

     public CustomBaseAdapter(Context context,ArrayList<Items> items){
        this.context = context;
        this.items = items;
    }

    private class ViewHolder{
    TextView titr;
    ImageView image;
    }

@Override
public int getCount() {
    return items.size();
}

@Override
public Items getItem(int position) {
    return items.get(position);
}

@Override
public long getItemId(int position) {
    return items.hashCode();
}

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

    LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    if(view==null){

        vi = inflater.inflate(R.layout.customlistitem,null);
        holder = new ViewHolder();
        holder.titr = (TextView) vi.findViewById(R.id.listtext);
        holder.image = (ImageView) vi.findViewById(R.id.listimg);
        holder.image.setTag(position);
        vi.setTag(holder);
    }
    else{
        holder = (ViewHolder) vi.getTag();
    }


    holder.titr.setText(items.get(position).getStrTxt());
    holder.image.setImageResource(items.get(position).getDrawableImage());
    holder.image.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            items.set(position,new Items(R.drawable.fav_ic));
            notifyDataSetChanged();
        }
    });
    return vi;
}
}

添加模型类：

public class Items {


    int drawableImage;
    String strTxt;


  public Items(int drawableImage) {
    this.drawableImage = drawableImage;
   }
    public int getDrawableImage() {
        return drawableImage;
    }

    public void setDrawableImage(int drawableImage) {
        this.drawableImage = drawableImage;
    }

    public String getStrTxt() {
        return strTxt;
    }

    public void setStrTxt(String strTxt) {
        this.strTxt = strTxt;
    }
}

这篇关于我在listview android中滚动期间更改图像的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！