【发布时间】：2015-12-24 20:57:49
【问题描述】：
我在删除 ArrayList 中的项目和同步 Adapter 时遇到问题。
我有我的RecyclerView 适配器，里面有一些ArrayList，称为items。我从服务器下载了一些列表并在其中显示。每当我单击某些列表项时，我想从服务器、本地 ArrayList 中删除它并通知适配器。问题是，当我从列表中删除从 down 到 up 的所有内容时，一切正常，但是当 f.e.我从列表中删除第一个元素，然后在我单击的那个元素之后随机删除一些元素。在某些情况下，应用程序崩溃（例如，我删除了第一个元素，然后删除了最后一个元素）。我得到的错误是 f.e.：
java.lang.IndexOutOfBoundsException: Invalid index 4, size is 4
看起来好像是列表大小的问题，但我不知道出了什么问题？
这是我从 (setPopUpListener(popupMenu, position)) 获得位置的函数：
// Binding New View
@Override
public void onBindViewHolder(ViewHolder holder, final int position) {
RecipeItem item = items.get(position);
// Binding Recipe Image
Picasso.with(context).load(item.getImgThumbnailLink()).into(holder.recipeItemImage);
// Binding Recipe Title
holder.recipeItemTitle.setText(item.getTitle());
// Binding Recipe Subtitle
String subtitle = "Kuchnia " + item.getKitchenType() + ", " + item.getMealType();
holder.recipeItemSubtitle.setText(subtitle);
// Binding Recipe Likes Count
holder.recipeItemLikesCount.setText(Integer.toString(item.getLikeCount()));
// Binding Recipe Add Date
holder.recipeItemAddDate.setText(item.getAddDate());
// Binding Recipe Options Icon
holder.recipeItemOptionsIcon.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
PopupMenu popupMenu = new PopupMenu(context, v);
setPopUpListener(popupMenu, position); // Setting Popup Listener
inflatePopupMenu(popupMenu); // Inflating Correct Menu
popupMenu.show();
}
});
// Item Click Listener
holder.setClickListener(new RecipeItemClickListener() {
@Override
public void onClick(View view, int position) {
// taking to recipe activity
}
});
}
这里是setPopUpListener() - 看看removeFromFavourites(position)：
// Setting Popup Listener
private void setPopUpListener(PopupMenu popupMenu, final int position) {
popupMenu.setOnMenuItemClickListener(new PopupMenu.OnMenuItemClickListener() {
@Override
public boolean onMenuItemClick(MenuItem item) {
switch (popupType) {
// Add To Favourites Menu
case 0: {
switch (item.getItemId()) {
case R.id.item_add: {
addToFavourites(position);
return true;
}
}
}
// Remove From Favourites Menu
case 1: {
switch (item.getItemId()) {
case R.id.item_remove: {
removeFromFavourites(position);
return true;
}
}
}
}
return false;
}
});
}
这里是出现错误的地方 (removeFromFavourites(position))：
// Removing User's Favourite
private void removeFromFavourites(int position) {
// Checking Connection Status
if (!FormValidation.isOnline(context)) {
showSnackbarInfo(context.getString(R.string.err_msg_connection_problem),
R.color.snackbar_error_msg);
} else {
SQLiteHandler db = new SQLiteHandler(context);
// Getting User Unique ID
String userUniqueId = db.getUserUniqueId();
db.close();
RecipeItem listItem = items.get(position);
// Getting Recipe Unique ID
String recipeUniqueId = listItem.getUniqueId();
// Removing From User's Favourites
removeFromUserFavouritesOnServer(recipeUniqueId, userUniqueId);
// Removing Item From Local Array List
items.remove(position);
// Notifying Adapter That Item Has Been Removed
notifyItemRemoved(position);
}
}
【问题讨论】：
标签： android indexing android-recyclerview notifydatasetchanged