我已阅读现有问题，其中每行有两个列表项ListView with two items per row
问题类似，但区别在于我使用游标，在某些情况下我遇到项目位置的问题。我正在努力实现这个目标：
row1: [item1] [item2]
row2: [gone]
row3: [item3]
row5: [item4]
等
所以我在第一行内膨胀了两个列表项，然后我问（如果位置== 1），并且在里面我把row2的可见性消失了，因此它消失了，我实现了如上所述的情况。它在较新版本的android上运行良好，但在版本2.3及更低版本上会发生奇怪的事情。当我启动我的Activity时，当我把它放在去的时候，row2不会消失，而是每次调用bindView（）时它都会开始用row1（有两个项目）来改变地方。它在我的屏幕上看起来像这样：
row1: [item1] [item2]
row2: [gone] (I see empty space on screen)
然后
row1: [gone] (I see empty space on top of the screen)
row2: [item1] [item2]
依旧......
如果我每行放回一个项目，那么每个版本都能正常运行。那么光标可能会与在newView（）和bindView（）函数中获取这些位置相混淆？
有谁知道为什么会这样？
编辑：这是我建议的光标适配器类：
public class MyCursorAdapter extends CursorAdapter {
private boolean flag;
private View headerView;
private LayoutInflater inflater;
private ImageLoader imageLoader;
// private int positionId;
private int titleId;
private int imageId;
private int iconId;
private int categoryId;
private int dateId;
// private int subcategoryId;
// private int descriptionId;
// private int linkId;
int i = 0;
int j = 0;
public MyCursorAdapter(Context context, Cursor c, int flags) {
super(context, c, 0);
imageLoader = new ImageLoader(getActivity());
inflater = LayoutInflater.from(context);
headerView = null;
flag = true;
}
@Override
public void bindView(View view, Context context, Cursor cursor) {
Log.i("bindView", "bindView");
final ViewHolder holder = (ViewHolder) view.getTag();
// Log.i("bind", "bind view: " + i);
i++;
switch (getItemViewType(cursor)) {
case Constants.view_header:
// holder.title.setText(cursor.getString(titleId));
// imageLoader.DisplayImage(cursor.getString(imageId),
// holder.image);
// // downloader.download(cursor.getString(imageId), holder.image);
// break;
HeaderViewHolder headerHolder = (HeaderViewHolder) holder;
if (headerHolder == null) {
headerHolder = (HeaderViewHolder) headerView.getTag();
}
if (flag) {
flag = !flag;
headerHolder.leftViewHolder.title.setText(cursor.getString(titleId));
imageLoader.DisplayImage(cursor.getString(imageId), headerHolder.leftViewHolder.image);
}
else {
flag = !flag;
headerHolder.rightViewHolder.title.setText(cursor.getString(titleId));
imageLoader.DisplayImage(cursor.getString(imageId), headerHolder.rightViewHolder.image);
}
break;
case Constants.view_headline:
holder.title.setText(cursor.getString(titleId));
holder.date.setText(cursor.getString(dateId));
if (currentFragmentPosition == 0)
holder.category.setText(cursor.getString(categoryId));
imageLoader
.DisplayImage(cursor.getString(iconId), holder.image);
// Log.i("image", cursor.getString(iconId));
// downloader.download(cursor.getString(imageId), holder.image);
break;
case Constants.view_ad1:
if (!hasRunAd1) {
// mAdView1.loadAd();
if (!isTabletDevice()) {
initBanner(mAdView1, Constants.CATEGORY_AD_1_ID);
} else {
initBanner(mAdView1, Constants.CATEGORY_AD_1_TABLET_ID);
}
hasRunAd1 = true;
}
break;
case Constants.view_ad2:
if (!hasRunAd2) {
// mAdView2.loadAd();
if (!isTabletDevice()) {
initBanner(mAdView2, Constants.CATEGORY_AD_2_ID);
} else {
initBanner(mAdView2, Constants.CATEGORY_AD_2_TABLET_ID);
}
hasRunAd2 = true;
}
break;
case Constants.view_ad3:
if (!hasRunAd3) {
// mAdView3.loadAd();
if (!isTabletDevice()) {
initBanner(mAdView3, Constants.CATEGORY_AD_3_ID);
} else {
initBanner(mAdView3, Constants.CATEGORY_AD_3_TABLET_ID);
}
hasRunAd3 = true;
}
break;
default:
holder.title.setText(cursor.getString(titleId));
holder.date.setText(cursor.getString(dateId));
if (currentFragmentPosition == 0)
holder.category.setText(cursor.getString(categoryId));
imageLoader
.DisplayImage(cursor.getString(iconId), holder.image);
// downloader.download(cursor.getString(imageId), holder.image);
break;
}
}
@Override
public View newView(Context context, Cursor cursor, ViewGroup parent) {
Log.i("newView", "newView");
// Log.i("bind", "new view: " + j);
j++;
View row = null;
switch (getItemViewType(cursor)) {
case Constants.view_header:
// row = inflater
// .inflate(R.layout.news_list_header, parent, false);
// TextView headerTitle = (TextView) row
// .findViewById(R.id.news_list_header_title);
//
// row.setTag(new ViewHolder((ImageView) row
// .findViewById(R.id.news_list_header_image), headerTitle));
//
// if (currentFragmentPosition < Constants.headerColors.length)
// headerTitle
// .setBackgroundColor(Constants.headerColors[currentFragmentPosition]);
// else
// headerTitle
// .setBackgroundColor(Constants.defaultHeaderColor);
//
// break;
if (headerView == null) {
row = inflater.inflate(R.layout.news_list_header, parent, false);
RelativeLayout leftLayout = (RelativeLayout) row.findViewById(R.id.news_list_header_layout_left);
TextView leftTitle = (TextView) leftLayout.findViewById(R.id.news_list_header_title_left);
ViewHolder leftHolder = new ViewHolder((ImageView)leftLayout.findViewById(R.id.news_list_header_image_left), leftTitle);
RelativeLayout rightLayout = (RelativeLayout) row.findViewById(R.id.news_list_header_layout_right);
TextView rightTitle = (TextView) rightLayout.findViewById(R.id.news_list_header_title_right);
ViewHolder rightHolder = new ViewHolder((ImageView)rightLayout.findViewById(R.id.news_list_header_image_right), rightTitle);
HeaderViewHolder holder = new HeaderViewHolder(leftHolder, rightHolder);
row.setTag(holder);
headerView = row;
}
else {
row = new View(context);
row.setVisibility(View.GONE);
}
break;
case Constants.view_headline:
row = inflater.inflate(R.layout.news_list_headline, parent,
false);
row.setTag(new ViewHolder(
(ImageView) row
.findViewById(R.id.news_list_headline_image),
(TextView) row
.findViewById(R.id.news_list_headline_date),
(TextView) row
.findViewById(R.id.news_list_headline_category),
(TextView) row
.findViewById(R.id.news_list_headline_title)));
RelativeLayout headlineLayout = (RelativeLayout) row
.findViewById(R.id.news_list_headline_layout);
if (currentFragmentPosition < Constants.headlineColors.length)
headlineLayout
.setBackgroundColor(Constants.headlineColors[currentFragmentPosition]);
else
headlineLayout
.setBackgroundColor(Constants.defaultHeadlineColor);
break;
case Constants.view_ad1:
row = inflater.inflate(R.layout.news_list_ad_item, parent,
false);
mAdView1 = (MoPubView) row.findViewById(R.id.adview);
mAdView1.setAdUnitId(Constants.CATEGORY_AD_1_ID);
// row=initBanner(mAdView1, Constants.CATEGORY_AD_1_ID);
break;
case Constants.view_ad2:
row = inflater.inflate(R.layout.news_list_ad_item, parent,
false);
mAdView2 = (MoPubView) row.findViewById(R.id.adview);
mAdView2.setAdUnitId(Constants.CATEGORY_AD_2_ID);
break;
case Constants.view_ad3:
row = inflater.inflate(R.layout.news_list_ad_item, parent,
false);
mAdView3 = (MoPubView) row.findViewById(R.id.adview);
mAdView3.setAdUnitId(Constants.CATEGORY_AD_3_ID);
break;
default:
row = inflater.inflate(R.layout.news_list_item, parent, false);
row.setTag(new ViewHolder((ImageView) row
.findViewById(R.id.news_list_item_image),
(TextView) row.findViewById(R.id.news_list_item_date),
(TextView) row
.findViewById(R.id.news_list_item_category),
(TextView) row.findViewById(R.id.news_list_item_title)));
TextView colorTitle = (TextView) row
.findViewById(R.id.news_list_item_title);
if (currentFragmentPosition < Constants.headlineColors.length)
colorTitle
.setTextColor(Constants.headlineColors[currentFragmentPosition]);
else
colorTitle.setTextColor(Constants.defaultHeadlineColor);
break;
}
return row;
}
private void initBanner(MoPubView banner, String id) {
// View v = inflater.inflate(R.layout.news_list_ad_item, null,
// false);
// banner = (MoPubView) v.findViewById(R.id.adview);
final MoPubView bannerPlace = banner;
bannerPlace
.setOnAdLoadedListener(new MoPubView.OnAdLoadedListener() {
public void OnAdLoaded(MoPubView paramMoPubView) {
bannerPlace.setVisibility(View.VISIBLE);
}
});
bannerPlace
.setOnAdFailedListener(new MoPubView.OnAdFailedListener() {
public void OnAdFailed(MoPubView paramMoPubView) {
bannerPlace.setVisibility(View.GONE);
}
});
bannerPlace.setAdUnitId(id);
bannerPlace.loadAd();
}
private boolean isTabletDevice() {
if (android.os.Build.VERSION.SDK_INT >= 11) { // honeycomb
// test screen size, use reflection because isLayoutSizeAtLeast
// is
// only available since 11
Configuration con = getResources().getConfiguration();
try {
Method mIsLayoutSizeAtLeast = con.getClass().getMethod(
"isLayoutSizeAtLeast", int.class);
Boolean r = (Boolean) mIsLayoutSizeAtLeast.invoke(con,
Configuration.SCREENLAYOUT_SIZE_LARGE); // Configuration.SCREENLAYOUT_SIZE_XLARGE
return r;
} catch (Exception x) {
x.printStackTrace();
return false;
}
}
return false;
}
// helper for columns from database
private void initColumns(final Cursor c) {
if (c != null) {
// linkId = c.getColumnIndex(SvetDatabase.COL_LINK);
// positionId = c.getColumnIndex(SvetDatabase.COL_HEADPOS);
titleId = c.getColumnIndex(SvetDatabase.COL_TITLE);
imageId = c.getColumnIndex(SvetDatabase.COL_IMAGE);
iconId = c.getColumnIndex(SvetDatabase.COL_ICON);
categoryId = c.getColumnIndex(SvetDatabase.COL_CATEGORY);
dateId = c.getColumnIndex(SvetDatabase.COL_STRINGDATE);
// subcategoryId =
// c.getColumnIndex(SvetDatabase.COL_SUBCATEGORY);
// descriptionId =
// c.getColumnIndex(SvetDatabase.COL_DESCRIPTION);
}
}
@Override
public Cursor swapCursor(Cursor newCursor) {
initColumns(newCursor);
return super.swapCursor(newCursor);
}
@Override
public int getItemViewType(int position) {
if (position != 0) {
Cursor cursor = (Cursor) getItem(position);
return getItemViewType(cursor);
}
return 0;
}
// number of view types
@Override
public int getViewTypeCount() {
return 6;
}
// return view type
private int getItemViewType(Cursor cursor) {
return cursor.getInt(cursor
.getColumnIndexOrThrow(SvetDatabase.COL_HEADPOS));
}
}
谢谢！