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我在我的RecyclerView類中創建了兩個viewHolders，一個用於內容，另一個用於Facebook原生廣告，運行後我的應用程序立即發生衝突。我如何克服這一點？java.lang.ClassCastException在RecycleView中，ViewHolder
@Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
switch (viewType) {
case 0:
return new ViewHolderBoxOffice(layoutInflater.from(parent.getContext()).inflate(R.layout.custom_movie_box_office, parent, false));
case 2:
return new NativeAdViewHolder(layoutInflater.from(parent.getContext()).inflate(R.layout.custom_ads_facebook, parent, false));
}
return null;
}
@Override
public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
switch (holder.getItemViewType()) {
case 0:
ViewHolderBoxOffice v_holder = (ViewHolderBoxOffice) holder;
Movie currentMovie = mlistMovies.get(position);
v_holder.movieTitle.setText(currentMovie.getTitle());
Date movieReleaseDate = currentMovie.getReleaseDateTheater();
if (movieReleaseDate != null) {
String formmattedDate = dateFormat.format(movieReleaseDate);
v_holder.movieReleaseDate.setText(formmattedDate);
} else {
v_holder.movieReleaseDate.setText(Constants.NA);
}
int audienceScore = currentMovie.getAudienceScore();
if (audienceScore == -1) {
v_holder.movieAudienceScore.setRating(0.0F);
v_holder.movieAudienceScore.setAlpha(0.5F);
} else {
v_holder.movieAudienceScore.setRating(currentMovie.getAudienceScore()/20.0F);
v_holder.movieAudienceScore.setAlpha(1.0F);
}
String urlThumbnail = currentMovie.getUrlThumbnail();
loadImages(urlThumbnail, v_holder);
case 2:
NativeAdViewHolder mHolder=(NativeAdViewHolder)holder;
// Setting the Text.
nativeAd.unregisterView();
mHolder.nativeAdCallToAction.setText(nativeAd.getAdCallToAction());
mHolder.nativeAdSocialContext.setText(nativeAd.getAdSocialContext());
mHolder.nativeAdTitle.setText(nativeAd.getAdTitle());
mHolder.nativeAdBody.setText(nativeAd.getAdBody());
// Downloading and setting the ad icon.
NativeAd.Image adIcon = nativeAd.getAdIcon();
NativeAd.downloadAndDisplayImage(adIcon, mHolder.nativeAdIcon);
// Download and setting the cover image.
NativeAd.Image adCoverImage = nativeAd.getAdCoverImage();
mHolder.nativeAdMedia.setNativeAd(nativeAd);
// Add adChoices icon
// if (adChoicesView == null)
if(! (mHolder.adview.getChildAt(0) instanceof AdChoicesView)){
AdChoicesView adChoicesView = new AdChoicesView(layoutInflater.getContext(), nativeAd, true);
mHolder.adview.addView(adChoicesView, 0);
}
nativeAd.registerViewForInteraction(mHolder.adview);
default:
break;
}
if (position > previousPosition) {
comeagain.materialdesign.anim.AnimationUtils.animate(holder, true);
} else {
comeagain.materialdesign.anim.AnimationUtils.animate(holder, false);
}
previousPosition = position;
}
private void loadImages(String urlThumbnail, final ViewHolderBoxOffice holder) {
if (urlThumbnail != null) {
imageLoader.get(urlThumbnail, new ImageLoader.ImageListener() {
@Override
public void onResponse(ImageLoader.ImageContainer response, boolean isImmediate) {
holder.movieThumbnail.setImageBitmap(response.getBitmap());
}
@Override
public void onErrorResponse(VolleyError error) {
}
});
}
}
@Override
public int getItemCount() {
return mlistMovies.size();
}
@Override
public void onError(Ad ad, AdError adError) {
}
@Override
public void onAdLoaded(Ad ad) {
}
@Override
public void onAdClicked(Ad ad) {
L.m("Ads is loaded, Jeez man that is good");
System.out.println("Loaded in fragment");
nativeAd = manager.nextNativeAd();
nativeAd.setAdListener(this);
}
@Override
public int getItemViewType(int position) {
int viewType = 0;
if (position % 5 == 1)
viewType = 2;
return viewType;
}
@Override
public void onAdsLoaded() {
L.m("Ads is loaded, Jeez man that is good");
System.out.println("Loaded in fragment");
nativeAd = manager.nextNativeAd();
nativeAd.setAdListener(this);
}
@Override
public void onAdError(AdError adError) {
}
class NativeAdViewHolder extends RecyclerView.ViewHolder {
private ImageView nativeAdIcon;
private TextView nativeAdTitle;
private TextView nativeAdBody;
private MediaView nativeAdMedia;
private TextView nativeAdSocialContext;
private Button nativeAdCallToAction;
private LinearLayout adview;
public NativeAdViewHolder(View itemView) {
super(itemView);
// Create native UI using the ad metadata.
nativeAdIcon = (ImageView) itemView.findViewById(R.id.native_ad_icon);
nativeAdTitle = (TextView) itemView.findViewById(R.id.native_ad_title);
nativeAdBody = (TextView) itemView.findViewById(R.id.native_ad_body);
nativeAdMedia = (MediaView) itemView.findViewById(R.id.native_ad_media);
nativeAdSocialContext = (TextView) itemView.findViewById(R.id.native_ad_social_context);
nativeAdCallToAction = (Button) itemView.findViewById(R.id.native_ad_call_to_action);
adview=(LinearLayout) itemView.findViewById(R.id.ads_unit);
}
}
class ViewHolderBoxOffice extends RecyclerView.ViewHolder implements View.OnClickListener {
private ImageView movieThumbnail;
private TextView movieTitle;
private TextView movieReleaseDate;
private RatingBar movieAudienceScore;
public ViewHolderBoxOffice(View itemView) {
super(itemView);
itemView.setOnClickListener(this);
movieThumbnail = (ImageView) itemView.findViewById(R.id.movieThumbnail);
movieTitle = (TextView) itemView.findViewById(R.id.movieTitle);
movieReleaseDate = (TextView) itemView.findViewById(R.id.movieReleaseDate);
movieAudienceScore = (RatingBar) itemView.findViewById(R.id.movieAudienceScore);
}
這是錯誤。
01-31 16:30:48.944 9429-9429/comeagain.materialdesign E/AndroidRuntime: FATAL EXCEPTION: main
Process: comeagain.materialdesign, PID: 9429
java.lang.ClassCastException: comeagain.materialdesign.adapters.AdapterBoxOffice$ViewHolderBoxOffice cannot be cast to comeagain.materialdesign.adapters.AdapterBoxOffice$NativeAdViewHolder
at comeagain.materialdesign.adapters.AdapterBoxOffice.onBindViewHolder(AdapterBoxOffice.java:148)
at android.support.v7.widget.RecyclerView$Adapter.onBindViewHolder(RecyclerView.java:5217)
錯誤是在行
NativeAdViewHolder mHolder=(NativeAdViewHolder)holder;
我無法確定是什麼問題以及如何解決這個問題。請幫助。