ListView的杂乱地堆在滚动 [英] ListView Jumbled on scroll

问题描述

我已经扩展底座适配器---我有一些奇怪的问题......当我滚动列表视图这个 - 我的最后一个项与第一项，下一次更换时我滚动 - 另一个项目和所有..它的某个时候是正确的。为什么它的这个code发生了什么？

  @覆盖
    公共查看getView（最终诠释的立场，观点convertView，父母的ViewGroup）{
        //设置视图到列表视图
        LinearLayout中的RowLayout = NULL;        的System.out.println（getView+位置++ convertView）;
        的RowLayout =（的LinearLayout）mInflater.inflate（
                R.layout.apps_list_row_items，父母，假）;
        如果（convertView == NULL）{
            //充气行            vh.mAppIcon =（ImageView的）rowLayout.findViewById（R.id.icon）;
            vh.mAppName =（TextView中）rowLayout.findViewById（R.id.application）;            vh.mAppHint =（TextView中）rowLayout.findViewById（R.id.hint）;            mDownloadButton =（按钮）rowLayout.findViewById（R.id.download）;
            mDownloadButton.setFocusable（假）;        }其他{
            // convertView.getTag（）;
            的RowLayout =（LinearLayout中）convertView;
        }
        // convertView.getTag（）;        //在点击下载按钮触发异步下载的
        // 文件。
        米康= mAppIconMapList.get（位置）;
        的System.out.println（图标+米康）;
        mCurrentApplication = mAvaiableApps.get（位置）;
        的System.out.println（当前应用程序+ mCurrentApplication）;
        vh.mAppIcon.setImageBitmap（mIcon.get（mCurrentApplication））;
        vh.mAppName.setText（mCurrentApplication.replace（），APK）;
        vh.mAppHint.setText（点击此处查看说明）;        返回的RowLayout;
    }
 

解决方案

您的 getView 方式看起来有点可疑，尝试如下更改它：

  @覆盖
公共查看getView（最终诠释的立场，观点convertView，父母的ViewGroup）{
        //设置视图到列表视图        ViewHolder VH =无效;
        的System.out.println（getView+位置）;        如果（convertView == NULL）{
            //充气行
            LinearLayout中的RowLayout =（的LinearLayout）mInflater.inflate（
                R.layout.apps_list_row_items，父母，假）;            vh.mAppIcon =（ImageView的）rowLayout.findViewById（R.id.icon）;
            vh.mAppName =（TextView中）rowLayout.findViewById（R.id.application）;            vh.mAppHint =（TextView中）rowLayout.findViewById（R.id.hint）;            mDownloadButton =（按钮）rowLayout.findViewById（R.id.download）;
            mDownloadButton.setFocusable（假）;            convertView.setTag（VH）;        }其他{
            VH =（ViewHolder）convertView.getTag（）;
        }
        //在点击下载按钮触发异步下载的
        // 文件。
        米康= mAppIconMapList.get（位置）;
        的System.out.println（图标+米康）;
        mCurrentApplication = mAvaiableApps.get（位置）;
        的System.out.println（当前应用程序+ mCurrentApplication）;
        vh.mAppIcon.setImageBitmap（mIcon.get（mCurrentApplication））;
        vh.mAppName.setText（mCurrentApplication.replace（），APK）;
        vh.mAppHint.setText（点击此处查看说明）;        返回convertView;
}
 

i have extended Base Adapter --- i am having some strange problem... when i scroll this listview -- my last items are replaced with first item and next time when i scroll - another item and all.. sometime it is correct.. why its happening with this code ?

@Override
    public View getView(final int position, View convertView, ViewGroup parent) {
        // sets the view onto list view
        LinearLayout rowLayout = null;

        System.out.println("getView " + position + " " + convertView);
        rowLayout = (LinearLayout) mInflater.inflate(
                R.layout.apps_list_row_items, parent, false);
        if (convertView == null) {
            // inflating the row

            vh.mAppIcon = (ImageView) rowLayout.findViewById(R.id.icon);
            vh.mAppName = (TextView) rowLayout.findViewById(R.id.application);

            vh.mAppHint = (TextView) rowLayout.findViewById(R.id.hint);

            mDownloadButton = (Button) rowLayout.findViewById(R.id.download);
            mDownloadButton.setFocusable(false);

        } else {
            // convertView.getTag();
            rowLayout = (LinearLayout) convertView;
        }
        // convertView.getTag();

        // On Click of the download button which triggers an async to download
        // the file.


        mIcon = mAppIconMapList.get(position);
        System.out.println("Icon " + mIcon);
        mCurrentApplication = mAvaiableApps.get(position);
        System.out.println("Current App " + mCurrentApplication);
        vh.mAppIcon.setImageBitmap(mIcon.get(mCurrentApplication));
        vh.mAppName.setText(mCurrentApplication.replace(".apk", ""));
        vh.mAppHint.setText("Click here to view Description");

        return rowLayout;
    }

解决方案

Your getView method looks a little suspicious, try changing it as below:

@Override
public View getView(final int position, View convertView, ViewGroup parent) {
        // sets the view onto list view

        ViewHolder vh = null;


        System.out.println("getView " + position);

        if (convertView == null) {
            // inflating the row
            LinearLayout rowLayout = (LinearLayout) mInflater.inflate(
                R.layout.apps_list_row_items, parent, false);

            vh.mAppIcon = (ImageView) rowLayout.findViewById(R.id.icon);
            vh.mAppName = (TextView) rowLayout.findViewById(R.id.application);

            vh.mAppHint = (TextView) rowLayout.findViewById(R.id.hint);

            mDownloadButton = (Button) rowLayout.findViewById(R.id.download);
            mDownloadButton.setFocusable(false);

            convertView.setTag(vh);

        } else {
            vh = (ViewHolder) convertView.getTag();
        }


        // On Click of the download button which triggers an async to download
        // the file.


        mIcon = mAppIconMapList.get(position);
        System.out.println("Icon " + mIcon);
        mCurrentApplication = mAvaiableApps.get(position);
        System.out.println("Current App " + mCurrentApplication);
        vh.mAppIcon.setImageBitmap(mIcon.get(mCurrentApplication));
        vh.mAppName.setText(mCurrentApplication.replace(".apk", ""));
        vh.mAppHint.setText("Click here to view Description");

        return convertView;
}

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