ClassCastException异常使用两种视图类型

Question

我试图使用两种类型的意见和两种类型的我的适配器ViewHolders的适配器时，但我看到了以下错误：

java.lang.ClassCastException: com.Sleep.Adapters.FriendsListAdapterFromKesh$ViewHolder2 cannot be cast to com.Sleep.Adapters.FriendsListAdapterFromKesh$ViewHolder1 
     at com.Sleep.Adapters.FriendsListAdapterFromKesh.getView(FriendsListAdapterFromKesh.java:226) 
     at android.widget.HeaderViewListAdapter.getView(HeaderViewListAdapter.java:220) 
     at android.widget.AbsListView.obtainView(AbsListView.java:2186) 
     at android.widget.ListView.makeAndAddView(ListView.java:1845) 
     at android.widget.ListView.fillUp(ListView.java:712) 
     at android.widget.ListView.fillGap(ListView.java:651) 

以下是完整的适配器类：

public class FriendsListAdapterFromKesh extends ArrayAdapter<FriendListEntryItem> { 
List<FriendListEntryItem> friends; 
List<FriendListEntryItem> friendsWithoutPoints; 
Context context; 
private LayoutInflater inflater; 
private LayoutInflater mLayoutInflater; 
private int type; 
private static String ROOT_DIRECTORY_PATH = Environment.getExternalStorageDirectory() + File.separator + ".Sleep/Photos old"; 
FriendsTab friendsTab; 

public FriendsListAdapterFromKesh(Context context, final List<FriendListEntryItem> friends, final List<FriendListEntryItem> friendsWithoutPoints) { 
    super(context, 0); 
    this.context = context; 
    inflater = LayoutInflater.from(context); 
    this.friendsWithoutPoints = friendsWithoutPoints; 
    this.friends = friends; 
    friendsTab = new FriendsTab(); 
    mLayoutInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
} 

public int getCountFriendsWithPoints() { 
    return friends.size(); 
} 


public List<FriendListEntryItem> getFriends() { 
    return friends; 
} 


public List<FriendListEntryItem> getFriendsWithoutPoints() { 
    return friendsWithoutPoints; 
} 

@Override 
public int getCount() { 
     return friends.size() + friendsWithoutPoints.size(); 
} 

    FriendListEntryItem ei = friends.get(position - step); 
    return ei.userId + "," + ei.socType + "," + ei.name; 
} 

static class ViewHolder1 { 
    public ImageView image; 
    public TextView title; 
    public TextView subtitle; 
} 

static class ViewHolder2 { 
    public ImageView image; 
    public TextView title; 
    public TypefacedButton button; 
} 

@Override 
public int getItemViewType(int pos) { 
    if (pos < friends.size()) 
     return 1; 
    return 2; 
} 

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

    int viewType = getItemViewType(position); 

    if (convertView == null) { 
     if (viewType == 1) { 
      LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
      convertView = inflater.inflate(R.layout.list_frnds_item_with_points, parent, false); 
      ViewHolder1 viewHolder1 = new ViewHolder1(); 
      viewHolder1.title = (TextView) convertView.findViewById(R.id.list_item_title_friend); 
      viewHolder1.image = (ImageView) convertView.findViewById(R.id.imageFriendAva); 
      viewHolder1.subtitle = (TextView) convertView.findViewById(R.id.list_item_friend_woke_time); 
      convertView.setTag(viewHolder1); 
     } else { 
      LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
      convertView = inflater.inflate(R.layout.list_frnds_item_without_points, parent, false); 

      ViewHolder2 viewHolder2 = new ViewHolder2(); 
      viewHolder2.title = (TextView) convertView.findViewById(R.id.list_item_title_friend); 
      viewHolder2.image = (ImageView) convertView.findViewById(R.id.imageFriendAva); 
      viewHolder2.subtitle = (TextView) convertView.findViewById(R.id.list_item_friend_woke_time); 
      convertView.setTag(viewHolder2); 
     } 

    } else { 
     if (convertView.getTag().getClass().equals(ViewHolder1.class)) { 
      ViewHolder1 holder1 = (ViewHolder1) convertView.getTag(); 
      final FriendListEntryItem ei = friends.get(position); 
      if (ei != null) { 
       if (holder1.title != null) { 
        holder1.title.setText(ei.name); 
       } 
       if (holder1.button != null) { 
        holder1.button.setFriendItem(ei); 
       } 
       if (holder1.image != null) { 
        File picture = findPicture(ei.name); 
        if (picture != null && picture.exists()) { 
         Picasso.with(context).load("file://" + picture.getAbsolutePath()).fit().centerCrop().into(holder1.image); 
        } 
       } 
      } 
     } if (convertView.getTag().getClass().equals(ViewHolder2.class)) { 
      ViewHolder2 holder2 = (ViewHolder2) convertView.getTag(); 
      final FriendListEntryItem ei = friendsWithoutPoints.get(position - friends.size()); 
      if (ei != null) { 
       if (holder2.title != null) { 
        holder2.title.setText(ei.name); 
       } 
       if (holder2.button != null) { 
        holder2.button.setFriendItem(ei); 
       } 
       if (holder2.image != null) { 
        File picture = findPicture(ei.name); 
        if (picture != null && picture.exists()) { 
         Picasso.with(context).load("file://" + picture.getAbsolutePath()).fit().centerCrop().into(holder2.image); 
        } 
       } 
      } 
     } 
    } 
    return convertView; 
} 

Answer 1

您没有覆盖getViewTypeCount。您需要添加

@Override 
public int getViewTypeCount() { 
    return 2; 
} 

在FriendsListAdapterFromKesh类，让您的自定义适配器知道有多少种不同的看法如何期待。由于您没有覆盖getViewTypeCount，因此您的适配器可能甚至不检查getItemViewType返回的值，它只是使所有视图都是相同的（第一个）类型。