I am trying to obtain tweets using a TimelineDelegate object in Android. The tweets are to populate a list when the app runs. My problem is that the tweets returned are null which causes the app to crash. Can anyone recommend a solution?
Here is the specific class that handles retrieving tweets:
package me.smac89.example.navigation.adapter;
import android.content.Context;
import android.support.annotation.Nullable;
import android.support.v4.widget.SwipeRefreshLayout;
import android.support.v7.widget.RecyclerView;
import android.util.AttributeSet;
import android.view.ViewGroup;
import com.twitter.sdk.android.core.Callback;
import com.twitter.sdk.android.core.Result;
import com.twitter.sdk.android.core.TwitterException;
import com.twitter.sdk.android.core.models.Tweet;
import com.twitter.sdk.android.tweetui.CompactTweetView;
import com.twitter.sdk.android.tweetui.SearchTimeline;
import com.twitter.sdk.android.tweetui.TimelineResult;
import com.twitter.sdk.android.tweetui.internal.TimelineDelegate;
import me.smac89.example.listener.RecyclerViewScrollListener;
public class TweetAdapter extends RecyclerView.Adapter<TweetAdapter.TweetViewHolder>
implements SwipeRefreshLayout.OnRefreshListener {
private static final int ITEMS_PER_RESULT = 10;
private final TimelineDelegate<Tweet> tweetsDelegate;
private final TweetsCallback cb;
private final Context context;
@Nullable
private OnRefreshFinishedListener refreshListener;
public TweetAdapter(Context ctx) {
cb = new TweetsCallback();
context = ctx;
tweetsDelegate = new TimelineDelegate<>(new SearchTimeline.Builder()
.query("%23twitterapi OR %23euro2016")
.resultType(SearchTimeline.ResultType.RECENT)
.maxItemsPerRequest(ITEMS_PER_RESULT)
.build());
tweetsDelegate.refresh(cb);
}
@Override
public TweetViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
CompactTweetView tv = new CompactTweetView(context, (AttributeSet) null);
return new TweetViewHolder(tv);
}
@Override
public void onBindViewHolder(TweetViewHolder holder, int position) {
Tweet tweet = tweetsDelegate.getItem(position);
CompactTweetView tv = (CompactTweetView) holder.itemView;
tv.setTweet(tweet);
}
@Override
public int getItemCount() {
return tweetsDelegate.getCount();
}
@Override
public void onRefresh() {
tweetsDelegate.refresh(cb);
}
public void setRefreshFinishedListener(@Nullable OnRefreshFinishedListener refreshListener) {
this.refreshListener = refreshListener;
}
public interface OnRefreshFinishedListener {
void onRefreshFinished();
}
static final class TweetViewHolder extends RecyclerView.ViewHolder {
public TweetViewHolder(CompactTweetView itemView) {
super(itemView);
}
}
private final class TweetsCallback extends Callback<TimelineResult<Tweet>> {
@Override
public void success(Result<TimelineResult<Tweet>> result) {
notifyDataSetChanged();
notifyListener();
}
@Override
public void failure(TwitterException exception) {
notifyListener();
}
private void notifyListener() {
if (refreshListener != null) {
refreshListener.onRefreshFinished();
}
}
}
}
When I run it, the specific error I get is the following:
07-06 17:46:28.726 1723-1723/me.smac89.example E/AndroidRuntime: FATAL EXCEPTION: main
Process: me.smac89.example, PID: 1723
java.lang.IllegalArgumentException: Target must not be null.
at com.squareup.picasso.RequestCreator.into(RequestCreator.java:618)
at com.squareup.picasso.RequestCreator.into(RequestCreator.java:601)
at com.twitter.sdk.android.tweetui.BaseTweetView.setProfilePhotoView(BaseTweetView.java:676)
at com.twitter.sdk.android.tweetui.BaseTweetView.render(BaseTweetView.java:474)
at com.twitter.sdk.android.tweetui.CompactTweetView.render(CompactTweetView.java:63)
at com.twitter.sdk.android.tweetui.BaseTweetView.setTweet(BaseTweetView.java:430)
at me.smac89.example.navigation.adapter.TweetAdapter.onBindViewHolder(TweetAdapter.java:52)
at me.smac89.example.navigation.adapter.TweetAdapter.onBindViewHolder(TweetAdapter.java:21)
at android.support.v7.widget.RecyclerView$Adapter.onBindViewHolder(RecyclerView.java:5471)
at android.support.v7.widget.RecyclerView$Adapter.bindViewHolder(RecyclerView.java:5504)
at android.support.v7.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:4741)
at android.support.v7.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:4617)
at android.support.v7.widget.LinearLayoutManager$LayoutState.next(LinearLayoutManager.java:1994)
at android.support.v7.widget.LinearLayoutManager.layoutChunk(LinearLayoutManager.java:1390)
at android.support.v7.widget.LinearLayoutManager.fill(LinearLayoutManager.java:1353)
at android.support.v7.widget.LinearLayoutManager.onLayoutChildren(LinearLayoutManager.java:574)
at android.support.v7.widget.RecyclerView.dispatchLayoutStep2(RecyclerView.java:3028)
at android.support.v7.widget.RecyclerView.dispatchLayout(RecyclerView.java:2906)
at android.support.v7.widget.RecyclerView.onLayout(RecyclerView.java:3283)
at android.view.View.layout(View.java:16630)
at android.view.ViewGroup.layout(ViewGroup.java:5437)
at android.support.v4.widget.SwipeRefreshLayout.onLayout(SwipeRefreshLayout.java:596)
at android.view.View.layout(View.java:16630)
at android.view.ViewGroup.layout(ViewGroup.java:5437)
at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1743)
at android.widget.LinearLayout.layoutHorizontal(LinearLayout.java:1732)
at android.widget.LinearLayout.onLayout(LinearLayout.java:1497)
at android.view.View.layout(View.java:16630)
at android.view.ViewGroup.layout(ViewGroup.java:5437)
at android.widget.RelativeLayout.onLayout(RelativeLayout.java:1079)
at android.view.View.layout(View.java:16630)
at android.view.ViewGroup.layout(ViewGroup.java:5437)
at android.widget.RelativeLayout.onLayout(RelativeLayout.java:1079)
at android.view.View.layout(View.java:16630)
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:16630)
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:16630)
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:16630)
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)
What do I need to do to make this thing work?
