您会注意到，在feedItems.adAll(adItems)下面的行public class FeedRecyclerAdapter extends LoadingRowRecyclerAdapter {
private static final int VIEW_TYPE_FEED = 1;
private static final int VIEW_TYPE_AD = 2;
private final Context context;
private final List<Feed> feedItems;
private final ImageLoader feedItemImageLoader;
private FeedItemClickListener feedItemClickListener;
private boolean isLongPressed = false;
public FeedRecyclerAdapter(Context context, List<Feed> feedItems, ImageLoader feedItemImageLoader, List<Feed> adItems) {
this.context = context;
this.feedItems = feedItems;
this.feedItemImageLoader = feedItemImageLoader;
feedItems.addAll(adItems);
// if (adItems.isEmpty()) {
// Log.d(getClass().toString(), "IndexOutOfBoundsException!");
// }
}
// Differentiate between feedItem views and nativeAds
@Override
public int getItemViewType(int position) {
int viewType = 1;
if ((position % 9 == 0) && position != 1) viewType = 2;
return viewType;
}
@Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
switch (viewType) {
case VIEW_TYPE_FEED:
return new FeedViewHolder(new FeedItemView(context));
case VIEW_TYPE_AD:
return new AdViewHolder(new AdItemView(context));
}
return super.onCreateViewHolder(parent, viewType);
}
@Override
public void onBindViewHolder(RecyclerView.ViewHolder viewHolder, int position) {
if (getItemViewType(position) == VIEW_TYPE_FEED) {
bindFeedItemView((FeedViewHolder) viewHolder, position);
} else {
bindAdItemView((AdViewHolder) viewHolder);
}
}
@Override
protected int getContentDataSize() {
return feedItems.size();
}
@Override
protected int getViewType(int position) {
if (position == 1) {
return VIEW_TYPE_FEED;
} else {
return VIEW_TYPE_AD;
}
}
class FeedViewHolder extends RecyclerView.ViewHolder {
FeedItemView feedItemView;
public FeedViewHolder(FeedItemView view) {
super(view);
this.feedItemView = view;
}
}
class AdViewHolder extends RecyclerView.ViewHolder {
AdItemView adItemView;
public AdViewHolder(AdItemView view) {
super(view);
this.adItemView = view;
}
}
private NativeAd nativeAd;
private AdChoicesView adChoicesView;
private void showNativeAd(AdViewHolder viewHolder){
AdSettings.addTestDevice("STRING");
nativeAd = new NativeAd(context, "STRING");
nativeAd.setAdListener(new AdListener() {
@Override
public void onError(Ad ad, AdError adError) {
}
@Override
public void onAdLoaded(Ad ad) {
final AdItemView adItemView = viewHolder.adItemView;
// Setting the Text
adItemView.nativeAdSocialContext.setText(nativeAd.getAdSocialContext());
adItemView.nativeAdCallToAction.setText(nativeAd.getAdCallToAction());
adItemView.nativeAdTitle.setText(nativeAd.getAdTitle());
adItemView.nativeAdBody.setText(nativeAd.getAdBody());
// Downloading and setting the ad icon
NativeAd.Image adIcon = nativeAd.getAdIcon();
NativeAd.downloadAndDisplayImage(adIcon, adItemView.nativeAdIcon);
// Download and setting the cover image
/*NativeAd.Image adCoverImage = nativeAd.getAdCoverImage();*/
adItemView.nativeAdMedia.setNativeAd(nativeAd);
// Add adChoices icon
if (adChoicesView == null) {
adChoicesView = new AdChoicesView(context, nativeAd, true);
adItemView.addView(adChoicesView, 0);
}
nativeAd.registerViewForInteraction(adItemView);
}
@Override
public void onAdClicked(Ad ad) {
}
});
nativeAd.loadAd();
}
// For Ad Objects
private void bindAdItemView(AdViewHolder viewHolder) {
showNativeAd(viewHolder);
}
// For Feed Objects
private void bindFeedItemView(FeedViewHolder viewHolder, int position) {
final FeedItemView feedItemView = viewHolder.feedItemView;
final Feed feedDesign = feedItems.get(position);
// TODO we can probably conditionally show or hide these based on the type of feed item, same as in FeedActivitySingle
feedItemView.showOrHideEditButton(true);
feedItemView.showOrHideBuyButton(false);
feedItemView.showOrHideFlipButton(false);
feedItemView.showOrHidePriceText(false);
// Set the results into TextViews
feedItemView.setProductPriceText(String.valueOf(feedDesign.getDesign().getPrice()));
feedItemView.setDownloadsText(String.valueOf(feedDesign.getDesign().getDownloadCount()));
feedItemView.setLikesText(String.valueOf(feedDesign.getDesign().getLikesCount()));
feedItemView.setUsernameText(feedDesign.getDesign().getAuthor().getUsername());
feedItemView.setTimestampText(feedDesign.getTimestampText());
feedItemView.getSaveImage().setImageResource(feedDesign.isInPersonalGallery() ? R.drawable.ic_action_saved : R.drawable.ic_not_saved);
feedItemView.getLikeImage().setImageResource(feedDesign.isLiked() ? R.drawable.ic_action_like_feed_full : R.drawable.ic_action_like_feed);
feedItemView.getTrashImage().setVisibility(ParseHelper.isCurrentUser(feedDesign.getDesign().getAuthor().getObjectId()) ? View.VISIBLE : View.GONE);
feedItemView.getFeedSocialShareImage().setVisibility(View.VISIBLE);
feedItemImageLoader.DisplayImage(feedDesign.getDesign().getCompressedImage().getUrl(), feedItemView.getImage(), feedItemView.getProgressBar());
if(feedDesign.getDesign().getAuthor().getProfilePicture() != null) {
feedItemImageLoader.DisplayImage(feedDesign.getDesign().getAuthor().getProfilePicture().getUrl(), feedItemView.getProfilePicture(), null); // TODO should this use profilePictureFileCache?
} else {
viewHolder.feedItemView.getProfilePicture().setImageResource(R.drawable.ic_anonymous);
}
SetCommentViews(feedItemView, feedDesign.getComments());
SetClickListeners(feedItemView, feedDesign);
}
下方，我已经注释了几行代码。每当发生此异常时，我都可以证明feedItems列表为空。
这是我的RecyclerAdapter：
07-05 11:51:30.179 22178-22178/com.elgami.customizer E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.elgami.customizer, PID: 22178
java.lang.IndexOutOfBoundsException: Invalid index 5, size is 5
at java.util.ArrayList.throwIndexOutOfBoundsException(ArrayList.java:255)
at java.util.ArrayList.get(ArrayList.java:308)
at com.elgami.feed.FeedRecyclerAdapter.bindFeedItemView(FeedRecyclerAdapter.java:180)
at com.elgami.feed.FeedRecyclerAdapter.onBindViewHolder(FeedRecyclerAdapter.java:77)
at android.support.v7.widget.RecyclerView$Adapter.onBindViewHolder(RecyclerView.java:5768)
at android.support.v7.widget.RecyclerView$Adapter.bindViewHolder(RecyclerView.java:5801)
at android.support.v7.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:5037)
at android.support.v7.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:4913)
at android.support.v7.widget.LinearLayoutManager$LayoutState.next(LinearLayoutManager.java:2029)
at android.support.v7.widget.LinearLayoutManager.layoutChunk(LinearLayoutManager.java:1414)
at android.support.v7.widget.LinearLayoutManager.fill(LinearLayoutManager.java:1377)
at android.support.v7.widget.LinearLayoutManager.scrollBy(LinearLayoutManager.java:1193)
at android.support.v7.widget.LinearLayoutManager.scrollVerticallyBy(LinearLayoutManager.java:1043)
at android.support.v7.widget.RecyclerView$ViewFlinger.run(RecyclerView.java:4357)
at android.view.Choreographer$CallbackRecord.run(Choreographer.java:858)
at android.view.Choreographer.doCallbacks(Choreographer.java:670)
at android.view.Choreographer.doFrame(Choreographer.java:603)
at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:844)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5417)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
造成这种情况的原因是什么？每当您向下滚动Feed时，VM都会关闭并导致以下异常：
// Differentiate between feedItem views and nativeAds
@Override
public int getItemViewType(int position) {
int viewType = 1;
if ((position % 5 == 0) && position != 1) viewType = 2;
return viewType;
}
修改
当商品的位置为5但不是10或15，或者我试过的任何其他数字时，例外情况就会停止：
我不明白为什么会这样。
答案 0 :(得分：2)
java.lang.IndexOutOfBoundsException：索引5无效，大小为5
例如，你有一个包含5个项目的数组，你要求第6个项目，它会崩溃并抛出“IndexOutOfBoundsException”错误，因为数组小于你要求的数据。
- ＆GT; Understand Arraylist IndexOutOfBoundsException in Android