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我正在尝试通过将它们作为替代 View 包含在我的 RecyclerAdapter 中来实现 Facebook 原生广告。有没有人有这方面的经验?为了更好地衡量,我已经包括了我的整个类(class)。
public class FeedRecyclerAdapter extends LoadingRowRecyclerAdapter implements AdListener {
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;
private NativeAd nativeAd;
private NativeAdsManager manager;
View adView;
public FeedRecyclerAdapter(Context context, List<Feed> feedItems, ImageLoader feedItemImageLoader, NativeAd nativeAd, NativeAdsManager manager) {
this.context = context;
this.feedItems = feedItems;
this.feedItemImageLoader = feedItemImageLoader;
this.nativeAd = nativeAd;
this.manager = manager;
}
@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 AdditionalHolder(LayoutInflater.from(context).inflate(R.layout.ad_test3, parent, false));
}
return super.onCreateViewHolder(parent, viewType);
}
public class AdditionalHolder extends RecyclerView.ViewHolder {
protected LinearLayout templateContainer;
protected ImageView blank_holder;
private LinearLayout nativeAdContainer;
private LinearLayout adView;
private AdChoicesView adChoicesView;
ImageView nativeAdIcon;
TextView nativeAdTitle;
TextView nativeAdBody;
MediaView nativeAdMedia;
TextView nativeAdSocialContext;
Button nativeAdCallToAction;
public AdditionalHolder(View view) {
super(view);
//// Add ad into the ad container.
nativeAdContainer = (LinearLayout) view.findViewById(R.id.ad_unit);
LayoutInflater inflater = LayoutInflater.from(context);
adView = (LinearLayout) inflater.inflate(R.layout.ad_test3, nativeAdContainer, false);
nativeAdContainer.addView(adView);
// Create native UI using the ad metadata.
nativeAdIcon = (ImageView) view.findViewById(R.id.native_ad_icon);
nativeAdTitle = (TextView) view.findViewById(R.id.native_ad_title);
nativeAdBody = (TextView) view.findViewById(R.id.native_ad_body);
nativeAdMedia = (MediaView) view.findViewById(R.id.native_ad_media);
nativeAdSocialContext = (TextView) view.findViewById(R.id.native_ad_social_context);
nativeAdCallToAction = (Button) view.findViewById(R.id.native_ad_call_to_action);
}
}
@Override
public void onBindViewHolder(RecyclerView.ViewHolder viewHolder, int position) {
if (getItemViewType(position) == VIEW_TYPE_FEED) {
bindFeedItemView((FeedViewHolder) viewHolder, position);
} else if (getItemViewType(position) == VIEW_TYPE_AD) {
AdditionalHolder new_holder = (AdditionalHolder) viewHolder;
try {
new_holder.templateContainer.removeViewInLayout(adView);
} catch (Exception e) {
e.printStackTrace();
}
nativeAd = manager.nextNativeAd();
try {
adView = NativeAdView.render(context, nativeAd, NativeAdView.Type.HEIGHT_300);
} catch (NullPointerException e) {
e.printStackTrace();
}
new_holder.templateContainer.addView(adView);
new_holder.blank_holder.setVisibility(View.GONE);
// Setting the Text.
new_holder.nativeAdSocialContext.setText(nativeAd.getAdSocialContext());
new_holder.nativeAdCallToAction.setText(nativeAd.getAdCallToAction());
new_holder.nativeAdTitle.setText(nativeAd.getAdTitle());
new_holder.nativeAdBody.setText(nativeAd.getAdBody());
// Downloading and setting the ad icon.
NativeAd.Image adIcon = nativeAd.getAdIcon();
NativeAd.downloadAndDisplayImage(adIcon, new_holder.nativeAdIcon);
// Download and setting the cover image.
NativeAd.Image adCoverImage = nativeAd.getAdCoverImage();
new_holder.nativeAdMedia.setNativeAd(nativeAd);
// Add adChoices icon
if (new_holder.adChoicesView == null) {
new_holder.adChoicesView = new AdChoicesView(context, nativeAd, true);
new_holder.adView.addView(new_holder.adChoicesView, 0);
}
nativeAd.registerViewForInteraction(new_holder.adView);
}
}
// 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;
}
// For feedItems
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);
}
@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;
}
}
// Facebook Ad methods
@Override
public void onError(Ad ad, AdError adError) {
}
@Override
public void onAdLoaded(Ad ad) {
}
@Override
public void onAdClicked(Ad ad) {
}
public void setFeedItemClickListener(FeedItemClickListener feedItemClickListener) {
this.feedItemClickListener = feedItemClickListener;
}
private void SetCommentViews(FeedItemView feedItemView, List<Comment> comments) {
feedItemView.getViewAllComments().setVisibility(View.VISIBLE);
feedItemView.setViewAllComments("View more comments");
// reset layouts to hidden
feedItemView.getComment1Layout().setVisibility(View.GONE);
feedItemView.getComment2Layout().setVisibility(View.GONE);
feedItemView.getComment3Layout().setVisibility(View.GONE);
if (comments == null || comments.size() == 0) {
feedItemView.getViewAllComments().setVisibility(View.GONE);
return;
}
// note these are meant to fall-through without break statements
switch (comments.size()) {
case 3:
feedItemView.getComment3Layout().setVisibility(View.VISIBLE);
feedItemView.setCommentUser3(comments.get(2).getAuthor().getUsername());
feedItemView.setCommentText3(comments.get(2).getComment());
case 2:
feedItemView.getComment2Layout().setVisibility(View.VISIBLE);
feedItemView.setCommentUser2(comments.get(1).getAuthor().getUsername());
feedItemView.setCommentText2(comments.get(1).getComment());
case 1:
feedItemView.getComment1Layout().setVisibility(View.VISIBLE);
feedItemView.setCommentUser1(comments.get(0).getAuthor().getUsername());
feedItemView.setCommentText1(comments.get(0).getComment());
break;
}
}
private void SetClickListeners(final FeedItemView feedItemView, final Feed feedDesign) {
// setup gesture detector with current view, view holder, and feed design
final GestureDetector gestureDetector = new GestureDetector(context, new GestureListener(feedDesign, feedItemView));
// set gesture detector on image view
feedItemView.setImageTouchListener(new View.OnTouchListener() {
@Override
public boolean onTouch(View view, MotionEvent motionEvent) {
if (motionEvent.getAction() == ACTION_UP){
if (isLongPressed){
isLongPressed = false;
feedItemClickListener.onMarkteFeedImageLongPressed_Release();
Log.d("anyTAG","Up");
return true;
}
}
if (motionEvent.getAction() == ACTION_MOVE){
return true;
}
return gestureDetector.onTouchEvent(motionEvent);
}
});
feedItemView.setTrashImageClickListener(v -> {
if (feedItemClickListener != null) {
feedItemClickListener.onTrashClicked(feedDesign);
}
});
feedItemView.setFeedSocialShareClickListener(v -> {
if (feedItemClickListener != null) {
try {
feedItemClickListener.onSocialShareClicked(feedDesign);
} catch (IOException e) {
e.printStackTrace();
}
}
});
feedItemView.setLikeImageClickListener(v -> {
if (feedItemClickListener != null) {
feedItemClickListener.onLikeClicked(feedDesign, feedItemView);
}
});
feedItemView.setSaveImageClickListener(v -> {
if (feedItemClickListener != null) {
feedItemClickListener.onSaveClicked(feedDesign, feedItemView);
}
});
feedItemView.setAuthorClickListener(v -> {
if (feedItemClickListener != null) {
feedItemClickListener.onAuthorClicked(feedDesign);
}
});
feedItemView.setCommentTextClickListener(v -> {
if (feedItemClickListener != null) {
feedItemClickListener.onCreateCommentClicked(feedDesign);
}
});
feedItemView.setViewAllCommentsClickListener(v -> {
if (feedItemClickListener != null) {
feedItemClickListener.onCreateCommentClicked(feedDesign);
}
});
feedItemView.setEditImageClickListener(v -> {
if (feedItemClickListener != null) {
feedItemClickListener.onCreateEditImageClicked(feedDesign);
}
});
feedItemView.setCommentImageClickListener(v -> {
if (feedItemClickListener != null) {
feedItemClickListener.onCreateCommentClicked(feedDesign);
}
});
feedItemView.setCommentUser1ClickListener(v -> {
if (feedItemClickListener != null) {
feedItemClickListener.onAuthorClicked(feedDesign.getComments().get(0).getAuthor().getObjectId());
}
});
feedItemView.setCommentUser2ClickListener(v -> {
if (feedItemClickListener != null) {
feedItemClickListener.onAuthorClicked(feedDesign.getComments().get(1).getAuthor().getObjectId());
}
});
feedItemView.setCommentUser3ClickListener(v -> {
if (feedItemClickListener != null) {
feedItemClickListener.onAuthorClicked(feedDesign.getComments().get(2).getAuthor().getObjectId());
}
});
feedItemView.setProfilePictureClickListener(v -> {
if (feedItemClickListener != null) {
feedItemClickListener.onProfilePictureClicked(feedDesign);
}
});
}
class FeedViewHolder extends RecyclerView.ViewHolder {
FeedItemView feedItemView;
public FeedViewHolder(FeedItemView view) {
super(view);
this.feedItemView = view;
}
}
// Gesture detector for double tap
private class GestureListener extends GestureDetector.SimpleOnGestureListener {
private Feed feedDesign;
private FeedItemView feedItemView;
public GestureListener(Feed feedDesign, FeedItemView feedItemView) {
this.feedDesign = feedDesign;
this.feedItemView = feedItemView;
}
@Override
public boolean onDown(MotionEvent e) {
return true;
}
@Override
public boolean onDoubleTap(MotionEvent event) {
Log.d("FeedRecyclerAdapter", feedDesign.getDesign().getCompressedImage().getUrl());
if (feedItemClickListener != null) {
feedItemClickListener.onImageDoubleTapped(feedDesign, feedItemView);
}
return true;
}
@Override
public void onLongPress(MotionEvent event) {
if (event.getAction() == ACTION_DOWN)
{
if (!isLongPressed){
isLongPressed = true;
feedItemClickListener.onMarketFeedImageLongPressed(feedDesign, feedDesign.getDisplayedSide());
}
}
}
}
}
我收到以下异常:
07-01 16:32:12.509 23168-23168/com.elgami.customizer E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.elgami.customizer, PID: 23168
java.lang.NullPointerException: Attempt to invoke virtual method 'com.facebook.ads.NativeAd com.facebook.ads.NativeAdsManager.nextNativeAd()' on a null object reference
at com.elgami.feed.FeedRecyclerAdapter.onBindViewHolder(FeedRecyclerAdapter.java:121)
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.onLayoutChildren(LinearLayoutManager.java:578)
at android.support.v7.widget.RecyclerView.dispatchLayoutStep2(RecyclerView.java:3260)
at android.support.v7.widget.RecyclerView.dispatchLayout(RecyclerView.java:3069)
at android.support.v7.widget.RecyclerView.onLayout(RecyclerView.java:3518)
at android.view.View.layout(View.java:16636)
at android.view.ViewGroup.layout(ViewGroup.java:5437)
at android.support.v4.widget.SwipeRefreshLayout.onLayout(SwipeRefreshLayout.java:598)
at android.view.View.layout(View.java:16636)
at android.view.ViewGroup.layout(ViewGroup.java:5437)
at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1743)
at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1586)
at android.widget.LinearLayout.onLayout(LinearLayout.java:1495)
at android.view.View.layout(View.java:16636)
at android.view.ViewGroup.layout(ViewGroup.java:5437)
at android.widget.RelativeLayout.onLayout(RelativeLayout.java:1079)
at android.view.View.layout(View.java:16636)
at android.view.ViewGroup.layout(ViewGroup.java:5437)
at android.widget.FrameLayout.layoutChildren(FrameLayout.java:336)
at android.widget.FrameLayout.onLayout(FrameLayout.java:273)
at android.view.View.layout(View.java:16636)
at android.view.ViewGroup.layout(ViewGroup.java:5437)
at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1743)
at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1586)
at android.widget.LinearLayout.onLayout(LinearLayout.java:1495)
at android.view.View.layout(View.java:16636)
at android.view.ViewGroup.layout(ViewGroup.java:5437)
at android.widget.FrameLayout.layoutChildren(FrameLayout.java:336)
at android.widget.FrameLayout.onLayout(FrameLayout.java:273)
at android.view.View.layout(View.java:16636)
at android.view.ViewGroup.layout(ViewGroup.java:5437)
at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1743)
at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1586)
at android.widget.LinearLayout.onLayout(LinearLayout.java:1495)
at android.view.View.layout(View.java:16636)
at android.view.ViewGroup.layout(ViewGroup.java:5437)
at android.widget.FrameLayout.layoutChildren(FrameLayout.java:336)
at android.widget.FrameLayout.onLayout(FrameLayout.java:273)
at com.android.internal.policy.PhoneWindow$DecorView.onLayout(PhoneWindow.java:2678)
at android.view.View.layout(View.java:16636)
at android.view.ViewGroup.layout(ViewGroup.java:5437)
at android.view.ViewRootImpl.performLayout(ViewRootImpl.java:2171)
at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1931)
at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1107)
at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:6013)
at android.view.Choreographer$CallbackRecord.run(Choreographer.java:858)
at android.view.Choreographer.doCallbacks(Choreographer.java:670)
at android.view.Choreographer.doFrame(Choreographer.java:606)
at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:844)
at android.os.Ha
首先,它似乎在提示这一行:
nativeAd = manager.nextNativeAd();
这是我的 FeedActivity 类的要点:
https://gist.github.com/anonymous/bd1b6afd21d27744a99970d3f51aa8a0
最佳答案
NullPointerException
当您尝试调用方法或访问对象引用的字段但该引用不包含有效对象时发生。一个简单的例子是:
String someString;
char firstChar = someString.charAt(0); // ERROR!
此代码会引发错误,因为在调用 charAt
时,someString
变量未引用有效的 String
实例。请注意,第一行没有创建 String
实例,它仅声明了一个可能指向 String
的变量>。事实上,这段代码等同于:
String someString = null;
char firstChar = someString.charAt(0);
有关 NullPointerException
的更多信息,它们发生的原因以及如何修复它们:see this question .
在您的情况下,错误是由 line 176 in FeedActivity
引起的:
feedRecyclerAdapter = new FeedRecyclerAdapter(this, feedItems, new ImageLoader(new FeedItemFileCache(this)), nativeAd, manager);
这里,manager
是FeedActivity
类的实例字段,定义在line 87 上。 :
public NativeAdsManager manager;
问题是这个字段从来没有被赋值:这个字段没有赋值(比如manager = ...
)。因此,当执行第 176 行时,FeedRecyclerAdapter
接收 null
作为它的 manager
参数,并抛出一个 NullPointerException
稍后在 onBindViewHolder
中尝试使用该 manager
时。
解决方案是在您的 FeedActivity
中创建一个有效的 NativeAdsManager
并将其分配给 manager
,然后再传递给 FeedRecyclerAdapter
。 From the Facebook documentation about NativeAdsManager
,这样的代码应该是这样的:
public class YourActivity extends Activity implements NativeAdsManager.Listener {
private NativeAdsManager manager;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_layout);
manager = new NativeAdsManager(this, "YOUR_PLACEMENT_ID", 5);
manager.setListener(this);
manager.loadAds();
}
}
关于java - 使用 RecyclerAdapter 的 Facebook 原生广告,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/38162205/
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