android - 为一行中的按钮自定义 arrayadapter 和 onclicklistener

Question

我有一个自定义的数组适配器，我想在它的每一行中为一个按钮添加一个 onclicklistener，当我点击按钮时我想要改变图像资源，一切正常，除了当我点击一个按钮时图像发生变化，但另一行中另一个按钮的图像也发生变化。谢谢你的帮助 !这是我的代码:

    public class Coursadapter extends ArrayAdapter<String>{

    Context context; 
    int layoutResourceId;    
    ArrayList<String> data = null;
    WeatherHolder holder;

    public Coursadapter(Context context, int layoutResourceId, ArrayList<String> data) {
       // super(context, layoutResourceId, data, coeff);
        super(context, layoutResourceId, data);
        this.layoutResourceId = layoutResourceId;
        this.context = context;
        this.data = data;

    }

    public View getView(int position, View convertView, ViewGroup parent) {
        View row = convertView;


        if(row == null)
        {
            LayoutInflater inflater = ((Activity)context).getLayoutInflater();
            row = inflater.inflate(layoutResourceId, parent, false);

            holder = new WeatherHolder();
            holder.name = (TextView)row.findViewById(R.id.item_cours_name);
            holder.b=(ImageButton) row.findViewById(R.id.button);
            holder.b.setTag(holder);
            row.setTag(holder);
        }
        else
        {
            holder = (WeatherHolder)row.getTag();
        }

        holder.b.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                WeatherHolder w = (WeatherHolder) v.getTag();
                w.b.setImageResource(R.drawable.butgreen);


            }
        });
        String name1 = data.get(position);
        holder.name.setText(name1);


        return row;
    }

    static class WeatherHolder
    {

        TextView name;
        ImageButton b;
    }
}

Answer 1

检查代码所做的一些更改

包 com.example.dontpanic;

public class Coursadapter extends ArrayAdapter<String> {

    Context context;
    int layoutResourceId;
    ArrayList<String> data = null;
    WeatherHolder holder;

    public Coursadapter(Context context, int layoutResourceId,
            ArrayList<String> data) {
        // super(context, layoutResourceId, data, coeff);
        super(context, layoutResourceId, data);
        this.layoutResourceId = layoutResourceId;
        this.context = context;
        this.data = data;

    }

    public View getView(int position, View convertView, ViewGroup parent) {
        View row = convertView;

        if (row == null) {
            LayoutInflater inflater = ((Activity) context).getLayoutInflater();
            row = inflater.inflate(layoutResourceId, parent, false);

            holder = new WeatherHolder();
            holder.name = (TextView) row.findViewById(R.id.item_cours_name);
            holder.b = (ImageButton) row.findViewById(R.id.button);
            holder.b.setOnClickListener(new OnClickListener() {
                @Override
                public void onClick(View v) {
                    // TODO Auto-generated method stub
                    WeatherHolder w = (WeatherHolder) v.getTag();
                    w.b.setImageResource(R.drawable.butgreen);
                }
            });
            row.setTag(holder);

        } else {
            holder = (WeatherHolder) row.getTag();
        }

        holder.b.setTag(holder);
        String name1 = data.get(position);
        holder.name.setText(name1);

        return row;
    }

    static class WeatherHolder {

        TextView name;
        ImageButton b;
    }
}

将您的点击监听器放在 if 条件内，并在 if else 条件外设置标签