Question

我一直在尝试实现listview实现，其中显示textview或根据使用BaseAdapter在活动中输入到ArrayList的数据显示imageview。

我对自定义基础适配器的实现：

import java.util.ArrayList;
import java.util.List;
import java.util.TreeSet;

import com.android.pls.R;
import com.android.pls.common.ImageLoader;

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.TextView;

/**
 * @author ANKIT
 *
 */
public class CommentSplashListViewAdapter extends BaseAdapter 
{
    Context context;
    LayoutInflater inflater;
    ImageLoader imageLoader;
    private List<CommentSplashList> comments = new ArrayList<CommentSplashList>();
    private ArrayList<CommentSplashList> arraylist;

    public CommentSplashListViewAdapter(Context context, List<CommentSplashList> comments)
    {
        this.context = context;
        this.comments = comments;
        this.arraylist = new ArrayList<CommentSplashList>();
        imageLoader = new ImageLoader(context);
    }

    public void setListItems(List<CommentSplashList> commentLists) 
    {
        this.comments = commentLists;
        this.arraylist.addAll(commentLists);
    }

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

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

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

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

    @Override
    public int getItemViewType(int position) 
    {
        CommentSplashList comment = comments.get(position);

        if(comment.getContainsUrl() == false)
            return 0;
        else
            return 1;

    }

    public static class WithoutSplashbackViewHolder 
    {
        TextView creatorUserName;
        ImageView creatorProfilePic;
        TextView userComment;
        TextView timeAgo;
        //ImageView splashbackImage;
    }

    public static class WithSplashbackViewHolder 
    {
        TextView creatorUserName;
        ImageView creatorProfilePic;
        //TextView userComment;
        TextView timeAgo;
        ImageView splashbackImage;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) 
    {
        CommentSplashList comment = comments.get(position);

        WithoutSplashbackViewHolder holder1 = null;
        WithSplashbackViewHolder holder2 = null;

        View v = convertView;

        if (getItemViewType(position) == 0) 
        {
            holder1 = new WithoutSplashbackViewHolder();

            if (v == null) 
            {
                //GET View 1
                LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
                ViewGroup viewGroup = (ViewGroup)inflater.inflate(R.layout.splashitem_comment_without_splashback, null);

                v = viewGroup;


                holder1.creatorProfilePic = (ImageView) v.findViewById(R.id.creatorProfilePic);
                holder1.creatorUserName = (TextView) v.findViewById(R.id.creatorUserName);
                holder1.timeAgo = (TextView) v.findViewById(R.id.commentTimeAgo);

                holder1.userComment = (TextView) v.findViewById(R.id.userComment);
                //holder.splashbackImage = (ImageView) v.findViewById(R.id.splashbackImage);


            } 

            // Set the results into TextViews
            holder1.creatorUserName.setText(comment.getCreatorUserName());
            holder1.timeAgo.setText(comment.getTimeAgo());
            // Set the results into ImageView
            if(comment.getCreatorProfilePic() != "null")
                imageLoader.DisplayImage(comment.getCreatorProfilePic(),
                        holder1.creatorProfilePic);
            holder1.userComment.setText(comment.getUserComment());

            return v;


        } 
        else 
        {
            holder2 = new WithSplashbackViewHolder();


            if (v == null) 
            {
                //GET View 2
                LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
                ViewGroup viewGroup = (ViewGroup)inflater.inflate(R.layout.splashitem_comment_with_splashback, null);

                v = viewGroup;


                holder2.creatorProfilePic = (ImageView) v.findViewById(R.id.creatorProfilePic);
                holder2.creatorUserName = (TextView) v.findViewById(R.id.creatorUserName);
                holder2.timeAgo = (TextView) v.findViewById(R.id.commentTimeAgo);

                //holder.userComment = (TextView) v.findViewById(R.id.userComment);
                holder2.splashbackImage = (ImageView) v.findViewById(R.id.splashbackImage);

            } 

            // Set the results into TextViews
            holder2.creatorUserName.setText(comment.getCreatorUserName());
            //holder2.creatorUserName.setText("username");
            holder2.timeAgo.setText(comment.getTimeAgo());
            // Set the results into ImageView
            if(comment.getCreatorProfilePic() != "null")
                imageLoader.DisplayImage(comment.getCreatorProfilePic(),
                        holder2.creatorProfilePic);
            imageLoader.DisplayImage(comment.getSplashbackImage(),
                    holder2.splashbackImage);

            return v;
        }
    }



}

我还试图删除这些行：if（v == null）及其循环，它删除了错误，但它没有用toplashbackviewholder对视图进行膨胀。

我在堆栈和在线搜索但我找到了解决方案，他们只有多个布局，只有textview而不是imageviews。

Answer 1

我猜你误解了View Holders的含义。您应该将ViewHolder添加为convertView的标记。一般逻辑如下：

if (converView == null) {
    convertView = inflateView();
    holder = new Holder(convertView);
    converView.setTag(holder);
} else {
    holder = (Holder)convertView.getTag();
}

另外，如果getItemViewTypeCount（）= 2，那么你必须有2种项目类型，而不是3种（你有0,1,2）。

请告诉我这个方法：

comment.getContainsUrl()

使用Android中的BaseAdapter在listview中使用不同视图充气多个布局

1 个答案: