RecyclerViewアダプタが見つからず、レイアウトをスキップします

Question

私はアンドロイドアプリを作ろうとしています。それはrecyclerViewがjsonオブジェクトフォームhttps://newsapi.org/v1/sourcesからのデータで満たされ、cardviewsに入っています。これまで私はこのプロジェクトを行っていたが、完璧に走った。しかし、私が誤ってそのプロジェクトを削除したのと同じコードを繰り返したとき。 I私のエラー

をトレースすることはできませんよ、私はアプリを実行すると、私は次のエラー

03-17 21:55:36.706 22896-22896/com.example.user.samplebulletin E/RecyclerView: No adapter attached; skipping layout 03-17 21:55:36.774 22896-22896/com.example.user.samplebulletin W/art: Before Android 4.1, method int android.support.v7.widget.ListViewCompat.lookForSelectablePosition(int, boolean) would have incorrectly overridden the package-private method in android.widget.ListView

を取得し、私はいくつかの機能に@requiresapiタグを追加した覚えていますが、私はどれを覚えていけません。

jsonリクエストを実行した後、私はjsonオブジェクトを受け取り、完全に解析します（ロギングによってチェックされます）。しかし、私はこのエラーに

03-17 21:58:01.936 22896-22896/com.example.user.samplebulletin E/AndroidRuntime: FATAL EXCEPTION: main Process: com.example.user.samplebulletin, PID: 22896 java.lang.OutOfMemoryError: Failed to allocate a 506340012 byte allocation with 4409258 free bytes and 185MB until OOM at dalvik.system.VMRuntime.newNonMovableArray(Native Method) at android.graphics.BitmapFactory.nativeDecodeAsset(Native Method) at android.graphics.BitmapFactory.decodeStream(BitmapFactory.java:620) at android.graphics.BitmapFactory.decodeResourceStream(BitmapFactory.java:455) at android.graphics.drawable.Drawable.createFromResourceStream(Drawable.java:1152) at android.content.res.ResourcesImpl.loadDrawableForCookie(ResourcesImpl.java:724) at android.content.res.ResourcesImpl.loadDrawable(ResourcesImpl.java:575) at android.content.res.Resources.loadDrawable(Resources.java:854) at android.content.res.TypedArray.getDrawable(TypedArray.java:928) at android.widget.ImageView.(ImageView.java:167) at android.widget.ImageView.(ImageView.java:155) at android.support.v7.widget.AppCompatImageView.(AppCompatImageView.java:60) at android.support.v7.widget.AppCompatImageView.(AppCompatImageView.java:56) at android.support.v7.app.AppCompatViewInflater.createView(AppCompatViewInflater.java:106) at android.support.v7.app.AppCompatDelegateImplV9.createView(AppCompatDelegateImplV9.java:1021) at android.support.v7.app.AppCompatDelegateImplV9.onCreateView(AppCompatDelegateImplV9.java:1080) at android.support.v4.view.LayoutInflaterCompatHC$FactoryWrapperHC.onCreateView(LayoutInflaterCompatHC.java:47) at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:769) at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:727) at android.view.LayoutInflater.rInflate(LayoutInflater.java:858) at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:821) at android.view.LayoutInflater.rInflate(LayoutInflater.java:861) at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:821) at android.view.LayoutInflater.inflate(LayoutInflater.java:518) at android.view.LayoutInflater.inflate(LayoutInflater.java:426) at com.example.user.samplebulletin.NewsAdapter.onCreateViewHolder(NewsAdapter.java:33) at com.example.user.samplebulletin.NewsAdapter.onCreateViewHolder(NewsAdapter.java:19) at android.support.v7.widget.RecyclerView$Adapter.createViewHolder(RecyclerView.java:6321) at android.support.v7.widget.RecyclerView$Recycler.tryGetViewHolderForPositionByDeadline(RecyclerView.java:5509) at android.support.v7.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:5394) at android.support.v7.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:5390) at android.support.v7.widget.LinearLayoutManager$LayoutState.next(LinearLayoutManager.java:2149) at android.support.v7.widget.LinearLayoutManager.layoutChunk(LinearLayoutManager.java:1533) at android.support.v7.widget.LinearLayoutManager.fill(LinearLayoutManager.java:1496) at android.support.v7.widget.LinearLayoutManager.onLayoutChildren(LinearLayoutManager.java:593) at android.support.v7.widget.RecyclerView.dispatchLayoutStep2(RecyclerView.java:3537) at android.support.v7.widget.RecyclerView.dispatchLayout(RecyclerView.java:3266) at android.support.v7.widget.RecyclerView.onLayout(RecyclerView.java:3798) at android.view.View.layout(View.java:17535) at android.view.ViewGroup.layout(ViewGroup.java:5616) at android.widget.FrameLayout.layoutChildren(FrameLayout.java:323) at android.widget.FrameLayout.onLayout(FrameLayout.java:261) at android.view.View.layout(View.java:17535) at android.view.ViewGroup.layout(ViewGroup.java:5616) at android.support.v7.widget.ActionBarOverlayLayout.onLayout(ActionBarOverlayLayout.java:437) at android.view.View.layout(View.java:17535) at android.view.ViewGroup.layout(ViewGroup.java:5616) at android.widget.FrameLayout.layoutChildren(FrameLayout.java:323) at android.widget.FrameLayout.onLayout(FrameLayout.java:261) at android.view.View.layout(View.java:17535) 03-17 21:58:01.937 22896-22896/com.example.user.samplebulletin E/AndroidRuntime: at android.view.ViewGroup.layout(ViewGroup.java:5616) at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1741) at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1585) at android.widget.LinearLayout.onLayout(LinearLayout.java:1494) at android.view.View.layout(View.java:17535) at android.view.ViewGroup.layout(ViewGroup.java:5616) at android.widget.FrameLayout.layoutChildren(FrameLayout.java:323) at android.widget.FrameLayout.onLayout(FrameLayout.java:261) at com.android.internal.policy.DecorView.onLayout(DecorView.java:724) at android.view.View.layout(View.java:17535) at android.view.ViewGroup.layout(ViewGroup.java:5616) at android.view.ViewRootImpl.performLayout(ViewRootImpl.java:2354) at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:2081) at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1258) at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:6348) at android.view.Choreographer$CallbackRecord.run(Choreographer.java:871) at android.view.Choreographer.doCallbacks(Choreographer.java:683) at android.view.Choreographer.doFrame(Choreographer.java:619) at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:857) at android.os.Handler.handleCallback(Handler.java:751) at android.os.Handler.dispatchMessage(Handler.java:95) at android.os.Looper.loop(Looper.java:154) at android.app.ActivityThread.main(ActivityThread.java:6123) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:867) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:757)

を取得し、私はビットマップを使用していないと、このエラーは、最初の時間に直面したことがありません。

NewsActivity.java

パッケージcom.example.user.samplebulletin。

import android.support.v7.app.AppCompatActivity; 
import android.os.Bundle; 
import android.support.v7.widget.LinearLayoutManager; 
import android.support.v7.widget.RecyclerView; 
import android.view.Menu; 
import android.view.MenuItem; 

public class NewsActivity extends AppCompatActivity { 


    String jsonUrl = "https://newsapi.org/v1/articles?source=the-next-web&sortBy=latest&apiKey=bdba5de1b490495796a1595f77ed3f37"; 
    RecyclerView rv; 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_source); 

     rv = (RecyclerView)findViewById(R.id.news_recyclerview); 


     rv.setLayoutManager(new LinearLayoutManager(NewsActivity.this)); 


    } 

    @Override 
    public boolean onCreateOptionsMenu(Menu menu) { 
     getMenuInflater().inflate(R.menu.main, menu); 
     return true; 
    } 

    @Override 
    public boolean onOptionsItemSelected(MenuItem item) { 
     int itemThatWasClickedId = item.getItemId(); 
     if (itemThatWasClickedId == R.id.refresh) { 
      new NewsDownloader(NewsActivity.this, jsonUrl, rv).execute(); 
      return true; 
     } 
     return super.onOptionsItemSelected(item); 
    } 
} 

NewsAdapter.java

パッケージcom.example.user.samplebulletin。

import android.content.Context; 
import android.support.v7.widget.RecyclerView; 
import android.util.Log; 
import android.view.LayoutInflater; 
import android.view.View; 
import android.view.ViewGroup; 

import com.squareup.picasso.Callback; 
import com.squareup.picasso.Picasso; 

import java.util.ArrayList; 

/** 
* Created by User on 16-03-2017. 
*/ 

public class NewsAdapter extends RecyclerView.Adapter<NewsViewHolder> { 

    String TAG = "Not Bla"; 
    Context c; 
    ArrayList<NewsItem> newsItems; 

    public NewsAdapter(Context c, ArrayList<NewsItem> newsItems) { 
     this.c = c; 
     this.newsItems = newsItems; 
    } 

    @Override 
    public NewsViewHolder onCreateViewHolder(ViewGroup parent, int viewType) { 
     Log.d(TAG, "onCreateViewHolder: "); 
     View v= LayoutInflater.from(c).inflate(R.layout.card_news, parent, false); 
     return new NewsViewHolder(v); 
    } 


    @Override 
    public void onBindViewHolder(final NewsViewHolder holder, int position) { 
     Log.d(TAG, "onBindViewHolder: "); 
     NewsItem item = newsItems.get(position); 

     holder.progressBar.setVisibility(View.VISIBLE); 


     holder.title.setText(item.getTitle()); 
     holder.description.setText(item.getDescription()); 
     holder.author.setText(item.getAuthor()); 
     holder.date.setText(item.getPublishedAt()); 

     Picasso.with(c) 
       .load(item.getUrlToImage()) 
       .error(R.drawable.image_not_found) 
       .into(holder.image, new Callback() { 
        @Override 
        public void onSuccess() { 
         holder.progressBar.setVisibility(View.GONE); 
        } 

        @Override 
        public void onError() { 

        } 
       }); 

    } 

    @Override 
    public int getItemCount() { 
     return newsItems.size(); 
    } 
} 

NewsParser.java

Context c; 
    String jsonData; 
    RecyclerView rv; 
    String TAG = "NOT bla bla"; 
    NewsAdapter adapter; 

    ProgressDialog pd; 
    ArrayList<NewsItem> newsItems= new ArrayList<>(); 

    //String id, name, description, url, category, langCode, contCode, smallLogoUrl, medLogoUrl, largeLogoUrl; 


    public NewsParser(Context c, String jsonData, RecyclerView rv) { 
     this.c = c; 
     this.jsonData = jsonData; 
     this.rv = rv; 
    } 




    @Override 
    protected Boolean doInBackground(Void... params) { 
     return parse(); 
    } 

    @Override 
    protected void onPreExecute() { 
     super.onPreExecute(); 

     pd = new ProgressDialog(c); 
     pd.setTitle("Please wait..."); 
     pd.setMessage("Loading list of news newsItems"); 
     pd.show(); 
    } 

    @Override 
    protected void onPostExecute(Boolean isParsed) { 
     super.onPostExecute(isParsed); 

     pd.dismiss(); 
     if(isParsed){ 
      //bind 
      adapter = new NewsAdapter(c, newsItems); 
      rv.setAdapter(adapter); 
      //rv.setLayoutManager(new LinearLayoutManager(c)); 
     }else 
      Toast.makeText(c, "Unable to parse", Toast.LENGTH_LONG).show(); 
    } 



    private boolean parse(){ 
     try{ 
      JSONObject object = new JSONObject(jsonData); 
      JSONArray jsonArray = object.getJSONArray("articles"); 
      JSONObject jsonObject; 

      newsItems.clear(); 
      Log.d(TAG, object.toString()); 

      for(int i=0; i<jsonArray.length(); i++){ //jsonArray.length() 

       jsonObject = jsonArray.getJSONObject(i); 

       Log.d(TAG, "parse: "); 
       String author = jsonObject.getString("author"); 
       String title = jsonObject.getString("title"); 
       String description = jsonObject.getString("description"); 
       String url = jsonObject.getString("url"); 
       String urlToImage = jsonObject.getString("urlToImage"); 
       String publishedAt = jsonObject.getString("publishedAt"); 

       String printThis = "New news :\nauthor"+author+"\ntitle"+title+"\ndescription"+description+"\nurl"+url+"\nurlToImage"+urlToImage+"\npublishedAt"+publishedAt; 
       Log.d(TAG, printThis); 
       newsItems.add(new NewsItem(author, title, description, url, urlToImage, publishedAt)); 


      } 


      return true; 
     } catch (JSONException e) { 
      e.printStackTrace(); 
      return false; 
     } 
    } 

NewsDownloader.java

パッケージcom.example.user.samplebulletin。

import android.app.ProgressDialog; 
import android.content.Context; 
import android.os.AsyncTask; 
import android.support.v7.widget.RecyclerView; 
import android.util.Log; 
import android.widget.Toast; 

import java.io.BufferedInputStream; 
import java.io.BufferedReader; 
import java.io.IOException; 
import java.io.InputStream; 
import java.io.InputStreamReader; 
import java.net.HttpURLConnection; 

/** 
* Created by User on 16-03-2017. 
*/ 

public class NewsDownloader extends AsyncTask<Void, Void, String> { 
    Context c; 
    String jsonUrl; 
    RecyclerView rv; 

    String TAG = "Bla bla"; 
    ProgressDialog pd; 

    public NewsDownloader(Context c, String jsonUrl, RecyclerView rv) { 
     this.c = c; 
     this.jsonUrl = jsonUrl; 
     this.rv = rv; 
    } 

    @Override 
    protected void onPreExecute() { 
     super.onPreExecute(); 

     pd = new ProgressDialog(c); 
     pd.setTitle("Please wait..."); 
     pd.setMessage("Loading list of news sources"); 
     pd.show(); 
    } 

    @Override 
    protected String doInBackground(Void... params) { 
     return download(); 
    } 

    @Override 
    protected void onPostExecute(String jsonData) { 
     super.onPostExecute(jsonData); 

     pd.dismiss(); 
     if(jsonData.startsWith("Error")){ 
      String error = jsonData; 
      Toast.makeText(c, error, Toast.LENGTH_SHORT).show(); 
     }else{ 
      //parser 
      new NewsParser(c, jsonData, rv).execute(); 


     } 
    } 




    private String download(){ 
     Object connection = Connector.connect(jsonUrl); 
     if(connection.toString().startsWith("Error")) 
      return connection.toString(); 

     try{ 
      HttpURLConnection con = (HttpURLConnection)connection; 
      if(con.getResponseCode()==con.HTTP_OK){ 
       InputStream is = new BufferedInputStream(con.getInputStream()); 
       BufferedReader br = new BufferedReader(new InputStreamReader(is)); 

       String line; 
       StringBuffer jsonData = new StringBuffer(); 

       while((line = br.readLine())!=null) 
        jsonData.append(line+"\n"); 

       br.close(); 
       is.close(); 

       Log.d(TAG, jsonData.toString()); 
       return jsonData.toString(); 

      }else { 
       return "Error" + con.getResponseMessage(); 
      } 
     } catch (IOException e) { 
      e.printStackTrace(); 
      return "Error : "+e.getMessage(); 
     } 
    } 
} 

NewsViewHolder.java

パッケージcom.example.user.samplebulletin。

import android.support.v7.widget.RecyclerView; 
import android.view.View; 
import android.widget.ImageView; 
import android.widget.ProgressBar; 
import android.widget.TextView; 

/** 
* Created by User on 16-03-2017. 
*/ 

public class NewsViewHolder extends RecyclerView.ViewHolder{ 

    TextView title, author, date, description; 
    ImageView image; 
    ProgressBar progressBar; 

    public NewsViewHolder(View itemView) { 
     super(itemView); 

     title = (TextView)itemView.findViewById(R.id.news_title); 
     description = (TextView)itemView.findViewById(R.id.news_description); 
     author = (TextView)itemView.findViewById(R.id.news_author); 
     date = (TextView)itemView.findViewById(R.id.news_date); 

     image = (ImageView)itemView.findViewById(R.id.news_image); 

     progressBar = (ProgressBar)itemView.findViewById(R.id.news_progressbar); 
    } 
} 

Connector.java

パッケージcom.example.user.samplebulletin。

import java.io.IOException; 
import java.net.HttpURLConnection; 
import java.net.MalformedURLException; 
import java.net.URL; 

/** 
* Created by User on 16-03-2017. 
*/ 

public class Connector { 
    public static Object connect(String JSONUrl){ 
     try { 
      URL url = new URL(JSONUrl); 
      HttpURLConnection con = (HttpURLConnection)url.openConnection(); 

      con.setRequestMethod("GET"); 
      con.setConnectTimeout(15000); 
      con.setReadTimeout(15000); 
      con.setDoInput(true); 

      return con; 

     } catch (MalformedURLException e) { 
      e.printStackTrace(); 
      return "Error"+e.getMessage(); 
     } catch (IOException e) { 
      e.printStackTrace(); 
      return "Error"+e.getMessage(); 
     } 
    } 
} 

NewsItem.java

パッケージcom.example.user.samplebulletin。

/** 
* Created by User on 16-03-2017. 
*/ 

public class NewsItem { 
    String author, title, description, url, urlToImage, publishedAt; 

    public NewsItem(String author, String title, String description, String url, String urlToImage, String publishedAt) { 
     this.author = author; 
     this.title = title; 
     this.description = description; 
     this.url = url; 
     this.urlToImage = urlToImage; 
     this.publishedAt = publishedAt; 
    } 

    public String getAuthor() { 
     return author; 
    } 

    public String getTitle() { 
     return title; 
    } 

    public String getDescription() { 
     return description; 
    } 

    public String getUrl() { 
     return url; 
    } 

    public String getUrlToImage() { 
     return urlToImage; 
    } 

    public String getPublishedAt() { 
     return publishedAt; 
    } 
} 

Answer 1

03-17 21:58:01.936 22896-22896/com.example.user.samplebulletin E/AndroidRuntime: FATAL EXCEPTION: main Process: com.example.user.samplebulletin, PID: 22896 java.lang.OutOfMemoryError: Failed to allocate a 506340012 byte allocation with 4409258 free bytes and 185MB until OOM at dalvik.system.VMRuntime.newNonMovableArray(Native Method) at android.graphics.BitmapFactory.nativeDecodeAsset(Native Method) at

これは、あなたが持っている問題は、メモリの問題であることを示します。

データがAPIから取得されており、画像が巨大（1612×806）（image）であることを確認しましたが、これは1つのみです。RecyclerViewにこれらのうちのいくつかを入れることは、あなたの記憶を爆破するでしょう。

オプションは画像を読み込む前に縮小して表示します。

Picasso.with(c) 
      .load(item.getUrlToImage()) 
      .resize(70, 70) //The size of your imageView 
      .error(R.drawable.image_not_found) 
      .into(holder.image, new Callback() { 
       @Override 
       public void onSuccess() { 
        holder.progressBar.setVisibility(View.GONE); 
       } 

       @Override 
       public void onError() { 

       } 
      }); 

Answer 2

setAdapter（）はリサイクルビューを初期化した後に呼び出されていない場合に、このエラーが表示されます。ピカソはこれを試してみてください。このresize

へのオプションがあります。 あなたは、要求が、その後mDatasetでそれらの入ってくるニュースを追加完了し更新すると

rv = (RecyclerView)findViewById(R.id.news_recyclerview); 
rv.setLayoutManager(new LinearLayoutManager(NewsActivity.this)); 
ArrayList<NewsItem> mDataset = new ArrayList(); 
NewsAdapter mAdapter = new NewsAdapter(context,mDataset); 
rv.setAdapter(mAdapter); 

などのリサイクルビューを初期化した後setAdapter（）を呼び出すことができます。 mDatasetへの参照をNewsParserに渡す必要があります。

@Override 
protected void onPostExecute(Boolean isParsed) { 
    super.onPostExecute(isParsed); 

    pd.dismiss(); 
    if(isParsed){ 
     mDataset.addAll(newsItems); 
     mAdapter.notifyDataSetChanged(); 

    }else 
     Toast.makeText(c, "Unable to parse", Toast.LENGTH_LONG).show(); 
}