RecyclerView：沒有附加適配器;在回收站的Android

Question

跳過佈局我使用Recycle擺脫JSON URL數據包括TextView和ImageView 我有一些類：Activity，POJO和Adapter。

這是我的源代碼：（修訂）

public class PartOneActivity extends AppCompatActivity { 

private EditText editTextSearcch; 

List<GetDataAdapter> GetDataAdapter1; 
RecyclerView recyclerView; 
RecyclerView.LayoutManager recyclerViewlayoutManager; 
RecyclerView.Adapter recyclerViewadapter; 
String GET_JSON_DATA_HTTP_URL = "myURL"; 
String JSON_IMAGE_TITLE_NAME = "name"; 
String JSON_IMAGE_URL = "thumb"; 
JsonArrayRequest jsonArrayRequest ; 
RequestQueue requestQueue ; 


@Override 
protected void onCreate(Bundle savedInstanceState) { 
    setTheme(R.style.AppThemeRed); 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_main); 

    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar); 
    setSupportActionBar(toolbar); 

    initEditTextSearch(); 
    initRecyclerView(); 
} 

private void initEditTextSearch() { 
    /*mToolbar = (Toolbar) findViewById(R.id.toolbar); 
    setSupportActionBar(mToolbar); 
    setTitle(getString(R.string.app_name)); 
    mToolbar.setTitleTextColor(getResources().getColor(android.R.color.white));*/ 

    editTextSearcch = (EditText) findViewById(R.id.editTextSearch); 
    editTextSearcch.setVisibility(View.VISIBLE); 
} 

private void initRecyclerView() { 

    /* 
    RecyclerView recyclerView = (RecyclerView) findViewById(R.id.recyclerView); 
    recyclerView.setLayoutManager(new LinearLayoutManager(this)); 
    RecyclerAdapter recyclerAdapter = new RecyclerAdapter(createItemList()); 
    recyclerView.setAdapter(recyclerAdapter); 
    */ 

    GetDataAdapter1 = new ArrayList<>(); 
    recyclerView = (RecyclerView) findViewById(R.id.recyclerView); 
    recyclerViewadapter = new RecyclerViewAdapter(GetDataAdapter1, this); 
    recyclerView.setAdapter(recyclerViewadapter); 
    // recyclerView.setHasFixedSize(true); 
    recyclerViewlayoutManager = new LinearLayoutManager(this); 
    recyclerView.setLayoutManager(recyclerViewlayoutManager); 
    // JSON_DATA_WEB_CALL(); 
    json_data_web_call(); 

    recyclerView.addOnScrollListener(new HidingScrollListener() { 
     @Override 
     public void onHide() { 
      hideViews(); 
     } 

     @Override 
     public void onShow() { 
      showViews(); 
     } 
    }); 
} 

private void hideViews() { 
    editTextSearcch.animate().translationY(-editTextSearcch.getHeight()).setInterpolator(new AccelerateInterpolator(2)); 
} 

private void showViews() { 
    editTextSearcch.animate().translationY(0).setInterpolator(new DecelerateInterpolator(2)); 
} 



public void json_data_web_call(){ 

    jsonArrayRequest = new JsonArrayRequest(GET_JSON_DATA_HTTP_URL, 

      new Response.Listener<JSONArray>() { 
       @Override 
       public void onResponse(JSONArray response) { 

        json_parse_data_after_webcall(response); 
       } 
      }, 
      new Response.ErrorListener() { 
       @Override 
       public void onErrorResponse(VolleyError error) { 

       } 
      }); 

    requestQueue = Volley.newRequestQueue(this); 

    requestQueue.add(jsonArrayRequest); 
} 

public void json_parse_data_after_webcall(JSONArray array){ 

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

     GetDataAdapter GetDataAdapter2 = new GetDataAdapter(); 

     JSONObject json = null; 
     try { 

      json = array.getJSONObject(i); 

      GetDataAdapter2.setImageTitleNamee(json.getString(JSON_IMAGE_TITLE_NAME)); 

      GetDataAdapter2.setImageServerUrl(json.getString(JSON_IMAGE_URL)); 

     } catch (JSONException e) { 

      e.printStackTrace(); 
     } 
     GetDataAdapter1.add(GetDataAdapter2); 

    } 
    recyclerViewadapter.set(GetDataAdapter1); //may need to add a setter in adapter 
    recyclerViewadapter.notifyDataSetChanged(); 
    // recyclerViewadapter = new RecyclerViewAdapter(GetDataAdapter1, this); 
    // recyclerView.setAdapter(recyclerViewadapter); 
    } 
} 

RecyclerViewAdapter類：

public class RecyclerViewAdapter extends RecyclerView.Adapter<RecyclerViewAdapter.ViewHolder> { 

private static final int TYPE_HEADER = 4; 
private static final int TYPE_ITEM = 1; 

Context context; 
List<GetDataAdapter> getDataAdapter; 
ImageLoader imageLoader1; 

public RecyclerViewAdapter(List<GetDataAdapter> getDataAdapter, Context context){ 
    super(); 
    this.getDataAdapter = getDataAdapter; 
    this.context = context; 
} 

@Override 
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) { 

    View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.recyclerview_items, parent, false); 
    ViewHolder viewHolder = new ViewHolder(v); 
    return viewHolder; 
} 

@Override 
public void onBindViewHolder(ViewHolder Viewholder, int position) { 
    if (!isPositionHeader(position)) { 
     GetDataAdapter getDataAdapter1 = getDataAdapter.get(position - 1); 
     imageLoader1 = ServerImageParseAdapter.getInstance(context).getImageLoader(); 
     imageLoader1.get(getDataAdapter1.getImageServerUrl(), 
       ImageLoader.getImageListener(
         Viewholder.networkImageView,//Server Image 
         R.mipmap.ic_launcher,//Before loading server image the default showing image. 
         android.R.drawable.ic_dialog_alert //Error image if requested image dose not found on server. 
       ) 
     );  Viewholder.networkImageView.setImageUrl(getDataAdapter1.getImageServerUrl(), imageLoader1); 

    Viewholder.ImageTitleNameView.setText(getDataAdapter1.getImageTitleName()); 
    } 
} 

public int getDataAdapter() { 
    return getDataAdapter == null ? 0 : getDataAdapter.size(); 
} 

@Override 
public int getItemViewType(int position) { 
    if (isPositionHeader(position)) { 
     return TYPE_HEADER; 
    } 

    return TYPE_ITEM; 
} 

@Override 
public int getItemCount() { 

    return getDataAdapter() + 1; 
} 

private boolean isPositionHeader(int position) { 
    return position == 0; 
} 


class ViewHolder extends RecyclerView.ViewHolder{ 

    public TextView ImageTitleNameView; 
    public NetworkImageView networkImageView ; 

    public ViewHolder(View itemView) { 

     super(itemView); 

     ImageTitleNameView = (TextView) itemView.findViewById(R.id.textView_item) ; 

     networkImageView = (NetworkImageView) itemView.findViewById(R.id.VollyNetworkImageView1) ; 

    } 
} 

}

當我建立我看到Recycler無法加載TextView和ImageView，和CatLog出現以下異常：

E/RecyclerView: No adapter attached; skipping layout 
E/RecyclerView: No adapter attached; skipping layout 

如何解決這個異常？

Answer 1

您正在初始化來自請求的適配器響應。 最初，適配器設置爲空。 您需要設置

recyclerViewadapter = new RecyclerViewAdapter(GetDataAdapter1, this); 
recyclerView.setAdapter(recyclerViewadapter); 

在initRecyclerView

在json_parse_data_after_webcall 你應該做

recyclerViewadapter.setDataAdapter(GetDataAdapter1) //may need to add a setter in adapter 
recyclerViewadapter.notifyDataSetChanged() 

在RecyclerViewAdapter類

public setDataAdapter(ArrayList<GetDataAdapter>g){ 
this.getDataAdapter = g; 
} 

，改變recyclerviewAdapter declara重刑在PartOneActivity到

RecyclerViewAdapter recyclerViewadapter;