java - 发现不兼容的类型 java.lang : ArrayAdapter

Question

当我尝试下面的代码行

ItemRow itemdata = data.get(position);

在 ItemAdapter 类中我收到错误

所需的不兼容类型:com.fragment.ItemRow 发现:java.lang.object

完整的ItemRow.java类如下:

Package com.fragments;

import android.graphics.drawable.Drawable;

public class ItemRow {

String itemName;
Drawable icon;

public ItemRow(String itemName, Drawable icon) {
    super();
    this.itemName = itemName;
    this.icon = icon;
}

public String getItemName() {
    return itemName;
}
public void setItemName(String itemName) {
    this.itemName = itemName;
}
public Drawable getIcon() {
    return icon;
}
public void setIcon(Drawable icon) {
    this.icon = icon;
}

}

以及完整的 Itemadapeter 类，当我尝试时，我在其中得到了不兼容的类型

-ItemRow itemdata = data.get(position);在getView中

package com.fragments;
public class ItemAdapter extends ArrayAdapter {

List   data;
Context context;
int layoutResID;

public ItemAdapter(Context context, int layoutResourceId,List data) {
    super(context, layoutResourceId, data);

    this.data=data;
    this.context=context;
    this.layoutResID=layoutResourceId;

    // TODO Auto-generated constructor stub
 }

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

    NewsHolder holder = null;
    View row = convertView;
    holder = null;

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

        holder = new NewsHolder();

        holder.itemName = (TextView)row.findViewById(R.id.example_itemname);
        holder.icon=(ImageView)row.findViewById(R.id.example_image);
        holder.button1=(Button)row.findViewById(R.id.swipe_button1);
        holder.button2=(Button)row.findViewById(R.id.swipe_button2);
        holder.button3=(Button)row.findViewById(R.id.swipe_button3);
        row.setTag(holder);
    }
    else
    {
        holder = (NewsHolder)row.getTag();
    }

    ItemRow itemdata = data.get(position);


    holder.itemName.setText(itemdata.getItemName());
    holder.icon.setImageDrawable(itemdata.getIcon());

    holder.button1.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub
            Toast.makeText(context, "Button 1 Clicked",Toast.LENGTH_SHORT).show();
        }
    });

    holder.button2.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub
            Toast.makeText(context, "Button 2 Clicked",Toast.LENGTH_SHORT).show();
        }
    });

    holder.button3.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub
            Toast.makeText(context, "Button 3 Clicked",Toast.LENGTH_SHORT);
        }
    });

    return row;

}

static class NewsHolder{

    TextView itemName;
    ImageView icon;
    Button button1;
    Button button2;
    Button button3;
}

}

Answer 1

您的列表是raw type意思是Object所以你必须向下转换 Object到你的 POJO 即 ItemRow

ItemRow itemdata = (ItemRow )data.get(position);

或者你应该有一个 List<ItemRow> 的列表type ，因为不知道您要传递给此适配器的列表类型，因此请确保传递与 List<ItemRow> 相同的类型在这种情况下，请遵循最佳实践，将带有适配器的类型称为 extends ArrayAdapter<ItemRow>并在其他地方进行所需的更改。