畢加索再循環視圖改型2在網格視圖

-5

recyclerView = (RecyclerView)findViewById(R.id.card_recycler_view); 
     recyclerView.setHasFixedSize(true); 
     RecyclerView.LayoutManager layoutManager = new GridLayoutManager(getApplicationContext(),2); 
     recyclerView.setLayoutManager(layoutManager); 

      Retrofit retrofit = new Retrofit.Builder() 
        .baseUrl("http://192.168.0.2/littlezebra/scripts/") 
        .addConverterFactory(GsonConverterFactory.create()) 
        .build(); 

      login service = retrofit.create(login.class); 


      Call<dashboard> call = service.dash(); 

      call.enqueue(new Callback<dashboard>() { 
       @Override 
       public void onResponse(Call<dashboard> call, Response<dashboard> response) { 

        dashboard dashboard = response.body(); 
        data = new ArrayList<>(Arrays.asList(dashboard. getDashboard_info())); 
        adapter = new DataAdapter(data,context); 
        recyclerView.setAdapter(adapter); 

       }

適配器類：

public class DataAdapter extends RecyclerView.Adapter<DataAdapter.ViewHolder> { 
    private ArrayList<dashboard.Dashboard_info> android; 
    private Context context; 

    public DataAdapter(ArrayList<dashboard.Dashboard_info> android,Context context) { 
     this.android = android; 
     this.context = context; 
    } 


    public DataAdapter.ViewHolder onCreateViewHolder(ViewGroup viewGroup, int i) { 
    View view = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.card_row, viewGroup, false); 
     return new ViewHolder(view); 
    } 

    @Override 
    public void onBindViewHolder(DataAdapter.ViewHolder viewHolder, int i) { 

     viewHolder.tv_name.setText(android.get(i).getId()); 
     Picasso.with(context).load(android.get(i) 
       .getWeek_image()) 
       .resize(250,200) //to resize Image 
       .into(viewHolder.img_android); 
     viewHolder.tv_api_level.setText(android.get(i).getWeek_name()); 
    } 

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

    public class ViewHolder extends RecyclerView.ViewHolder{ 
     private TextView tv_name; 
     private ImageView img_android; 
     private TextView tv_api_level; 
     public ViewHolder(View view) { 
      super(view); 

      tv_name = (TextView)view.findViewById(R.id.tv_name); 
      img_android = (ImageView) view.findViewById(R.id.img_android); 
      tv_api_level = (TextView)view.findViewById(R.id.tv_api_level); 

     } 
    }

過程：

com.example.admin.myappl，PID：5047 java.lang.IllegalArgumentException：上下文不能爲null。在com.squareup.picasso.Picasso $ Builder。（Picasso.java:701）at com.squareup.picasso.Picasso.with（Picasso.java:662）at com.example.admin.myappl.Adapter.DataAdapter.onBindViewHolder（ DataAdapter.java:37）at com.example.admin.myappl.Adapter.DataAdapter.onBindViewHolder（DataAdapter.java:18）at android.support.v7.widget.RecyclerView $ Adapter.onBindViewHolder（RecyclerView.java:6400）at android .support.v7.widget.RecyclerView $ Adapter.bindViewHolder（RecyclerView.java:6433）at android.support.v7.widget.RecyclerView $ Recycler.tryBindViewHolderByDeadline（RecyclerView.java:5377）at android.support.v7.widget.RecyclerView $ Recycler.tryGetViewHolderForPositionByDeadline（RecyclerView.java:5640）at android.support.v7.widget.RecyclerView $ Recycler.getViewForPosition（RecyclerView.java:5482）at android.support.v7.widget.RecyclerView $ Recycler.getViewForPosition（RecyclerView.java ：5478）at android.support.v7.widget.LinearLayoutManager $ LayoutState.next（LinearLayoutManager.java:2215）at android.support.v7.widget.Grid LayoutManager.layoutChunk（GridLayoutManager.java:556）at android.support.v7.widget.LinearLayoutManager.fill（LinearLayoutManager.java:1502）at android.support.v7.widget.LinearLayoutManager.onLayoutChildren（LinearLayoutManager.java:595）at android .support.v7.widget.GridLayoutManager.onLayoutChildren（GridLayoutManager.java:170）at android.support.v7.widget.RecyclerView.dispatchLayoutStep2（RecyclerView.java:3625）at android.support.v7.widget.RecyclerView.dispatchLayout（RecyclerView的.java：3354）在android.support.v7.widget.RecyclerView.onLayout（RecyclerView.java:3886）在android.view.View.layout（View.java:17838）在android.view.ViewGroup.layout（ViewGroup中。的java：5754）在android.widget.RelativeLayout.onLayout（RelativeLayout.java:1189）在android.view.View.layout（View.java:17838）在android.view.ViewGroup.layout（ViewGroup.java:5754）在android.support.design.widget.ViewOffsetBehavior.on上的android.support.design.widget.HeaderScrollingViewBehavior.layoutChild（HeaderScrollingViewBehavior.java:131） LayoutCild（ViewOffsetBehavior.java:42）at android.support.design.widget.AppBarLayout $ ScrollingViewBehavior.onLayoutChild（AppBarLayout.java:1389）at android.support.design.widget.CoordinatorLayout.onLayout（CoordinatorLayout.java:868）at android .view.View.layout（View.java:17838）在android.view.ViewGroup.layout（ViewGroup.java:5754）在android.support.v4.widget.DrawerLayout.onLayout（DrawerLayout.java:1192）在機器人。在android.widget.FrameLayout.layoutChildren（FrameLayout.java:383）android.widget.FrameLayout.onLayout上android.view.ViewGroup.layout（ViewGroup.java:5754）處的view.View.layout（View.java:17838）（FrameLayout.java:321）在android.view.View.layout（View.java:17838）在android.view.ViewGroup.layout（ViewGroup.java:5754）在android.widget.LinearLayout.setChildFrame（LinearLayout.java： 1982）android.widget.LinearLayout.layoutVertical（LinearLayout.java:1826）在android.widget.LinearLayout.onLayout（LinearLayout.java:1735）在android.view.View.layout（View.java:17838）在android。 view.Vi在android.widget.FrameLayout.onLayout（FrameLayout.java:321）在android.view.View.layout（視圖）android.widget.FrameLayout.layoutChildren（FrameLayout.java:383）ewGroup.layout（ViewGroup.java:5754） .java：17838）在android.widget.Lineout.layoutVertical（LinearLayout.java:1826）android.widget.LinearLayout.setChildFrame（LinearLayout.java:1982）android.view.ViewGroup.layout（ViewGroup.java:5754）在android.widget.LinearLayout.onLayout（LinearLayout.java:1735）在android.view.View.layout（View.java:17838）在android.view.ViewGroup.layout（ViewGroup.java:5754）在android.widget。在android.view.View的com.android.internal.policy.DecorView.onLayout（DecorView.java:751）android.widget.FrameLayout.onLayout（FrameLayout.java:321）FrameLayout.layoutChildren（FrameLayout.java:383） .layout（View.java:17838）08-16 17：01：40.928 5047-5047/com.example.admin.myappl E/AndroidRuntime：在android.view.ViewGroup.layout（ViewGroup.java:5754）在機器人。 view.ViewRootImpl.performLayout（ViewRootImpl.java:2722）
at android.view.ViewRootImpl.performTraversals（ViewRootImpl。Java的：2395）在android.view.ViewRootImpl.doTraversal（ViewRootImpl.java:1473）在android.view.ViewRootImpl $ TraversalRunnable.run（ViewRootImpl.java:6976）

來源

2017-08-16 Muthu Samy

[什麼是NullPointerException，以及如何解決它？]的可能重複（https://stackoverflow.com/questions/218384/what-is-a-nullpointerexception-and-how-do-i-fix-it ） –

變化adapter = new DataAdapter(data,context);線adapter = new DataAdapter(data,YourActivity.this);

然後，轉到適配器類，

並粘貼

public class DataAdapter extends RecyclerView.Adapter<DataAdapter.ViewHolder> { 
    private ArrayList<dashboard.Dashboard_info> android; 
    private Activity activity; 

    public DataAdapter(ArrayList<dashboard.Dashboard_info> android,Activity activity) { 
     this.android = android; 
     this.activity = activity; 
    }

現在畢加索使用

Picasso.with(activity).load(android.get(i) 
       .getWeek_image()) 
       .resize(250,200) 
       .into(viewHolder.img_android);

來源

2017-08-16 11:48:05 user7439667

請

也許問題某處： Picasso.with（context）.load（「http://i.imgur.com/DvpvklR.png」）.into（imageView）;

來源

2017-08-16 11:40:40 MatusSeidl

如錯誤所述，您將null上下文對象傳遞給Picasso.with()方法。

爲了解決這個問題，你可以做這樣的事情在你的onBindViewHolder()方法：

//inside onBindViewHolder() 
Picasso.with(holder.itemView.getContext()).load("url here").into(yourImageView);

所以，你可以看到，你甚至都不需要通過上下文來在構造適配器。

來源

2017-08-16 11:43:37 Valentun

畢加索再循環視圖改型2在網格視圖

回答

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