始终显示警告
E/RecyclerView: No adapter attached; skipping layout
当我尝试在片段内实现Recycler视图时 并显示错误
W/System.err: com.android.volley.ParseError: org.json.JSONException: Value
{"Sales_Report":[{"id":"1","cash":"258","credit":"258","description":"","dates":"Nov-09-2016","camimg_path":""},{"id":"2","cash":"532","credit":"586","description":"","dates":"Nov-09-2016","camimg_path":"Gallery_images\/Test_gl.jpeg"},{"id":"3","cash":"214","credit":"980","description":"th","dates":"Nov-09-2016","camimg_path":"Gallery_images\/Test_gl.jpeg"},{"id":"4","cash":"123","credit":"321","description":"erp","dates":"Nov-09-2016","camimg_path":"Gallery_images\/Test_gl.jpeg"},{"id":"15","cash":"5","credit":"8","description":"5","dates":"Nov-09-2016","camimg_path":"Gallery_images\/galimg2016-11-09T14:44:21.483+05302516.jpeg"},{"id":"14","cash":"2","credit":"3","description":"","dates":"Nov-09-2016","camimg_path":"..\/Gallery_images\/galimg2016-11-09T14:42:56.857+05302620.jpeg"}]} of type org.json.JSONObject cannot be converted to JSONArray
W/System.err: at com.android.volley.toolbox.JsonArrayRequest.parseNetworkResponse(JsonArrayRequest.java:55)
W/System.err: at com.android.volley.NetworkDispatcher.run(NetworkDispatcher.java:121)
W/System.err: Caused by: org.json.JSONException: Value {"Sales_Report":[{"id":"1","cash":"258","credit":"258","description":"","dates":"Nov-09-2016","camimg_path":""},{"id":"2","cash":"532","credit":"586","description":"","dates":"Nov-09-2016","camimg_path":"Gallery_images\/Test_gl.jpeg"},{"id":"3","cash":"214","credit":"980","description":"th","dates":"Nov-09- 2016","camimg_path":"Gallery_images\/Test_gl.jpeg"}, {"id":"4","cash":"123","credit":"321","description":"erp","dates":"Nov-09- 2016","camimg_path":"Gallery_images\/Test_gl.jpeg"}, {"id":"15","cash":"5","credit":"8","description":"5","dates":"Nov-09- 2016","camimg_path":"Gallery_images\/galimg2016-11- 09T14:44:21.483+05302516.jpeg"}, {"id":"14","cash":"2","credit":"3","description":"","dates":"Nov-09- 2016","camimg_path":"..\/Gallery_images\/galimg2016-11- 09T14:42:56.857+05302620.jpeg"}]} of type org.json.JSONObject cannot be converted to JSONArray
W/System.err: at org.json.JSON.typeMismatch(JSON.java:111)
W/System.err: at org.json.JSONArray.<init>(JSONArray.java:96)
W/System.err: at org.json.JSONArray.<init>(JSONArray.java:108)
/System.err: at com.android.volley.toolbox.JsonArrayRequest.parseNetworkResponse(JsonArrayReques t.java:50)
帮帮我.... 这是我的 fragment.java
public class MessageFragment extends Fragment {
private List<Content> listSuperHeroes;
//Creating Views
private RecyclerView recyclerView;
private RecyclerView.LayoutManager layoutManager;
private RecyclerView.Adapter adapter;
public MessageFragment() {
// Required empty public constructor
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
View v= inflater.inflate(R.layout.fragment_message, container, false);
recyclerView = (RecyclerView) v.findViewById(R.id.recyclerView);
recyclerView.setHasFixedSize(true);
layoutManager = new LinearLayoutManager(getActivity());
recyclerView.setLayoutManager(layoutManager);
//Adding adapter to recyclerview
listSuperHeroes = new ArrayList<>();
//Calling method to get data
getData();
return v;
}
private void getData(){
//Showing a progress dialog
// final ProgressDialog loading = ProgressDialog.show(getActivity(),"Loading Data", "Please wait...",false,false);
//Creating a json array request
JsonArrayRequest jsonArrayRequest = new JsonArrayRequest(Config.DATA_URL,
new Response.Listener<JSONArray>() {
@Override
public void onResponse(JSONArray response) {
//Dismissing progress dialog
// loading.dismiss();
//calling method to parse json array
parseData(response);
}
},
new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
}
});
//Creating request queue
RequestQueue requestQueue = Volley.newRequestQueue(getActivity().getApplicationContext());
//Adding request to the queue
requestQueue.add(jsonArrayRequest);
}
private void parseData(JSONArray array){
for(int i = 0; i<array.length(); i++) {
Content superHero = new Content();
JSONObject json = null;
try {
json = array.getJSONObject(i);
superHero.setImageUrl(json.getString(Config.TAG_IMAGE_URL));
superHero.setName(json.getString(Config.TAG_NAME));
superHero.setRank(json.getInt(Config.TAG_RANK));
superHero.setRealName(json.getString(Config.TAG_REAL_NAME));
superHero.setCreatedBy(json.getString(Config.TAG_CREATED_BY));
superHero.setFirstAppearance(json.getString(Config.TAG_FIRST_APPEARANCE));
ArrayList<String> powers = new ArrayList<String>();
JSONArray jsonArray = json.getJSONArray(Config.TAG_POWERS);
for(int j = 0; j<jsonArray.length(); j++){
powers.add(((String) jsonArray.get(j))+"\n");
}
superHero.setPowers(powers);
} catch (JSONException e) {
e.printStackTrace();
}
listSuperHeroes.add(superHero);
}
adapter = new CardAdapter(listSuperHeroes, getActivity());
//Finally initializing our adapter
recyclerView.setAdapter(adapter);
}
}
这是我的 Cardadapter.java 类
public class CardAdapter extends RecyclerView.Adapter<CardAdapter.ViewHolder> {
private ImageLoader imageLoader;
private Context context;
//List of superHeroes
List<Content> superHeroes;
public CardAdapter(List<Content> superHeroes, Context context){
super();
//Getting all the superheroes
this.superHeroes = superHeroes;
this.context = context;
}
@Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View v = LayoutInflater.from(parent.getContext())
.inflate(R.layout.content_list, parent, false);
ViewHolder viewHolder = new ViewHolder(v);
return viewHolder;
}
@Override
public void onBindViewHolder(ViewHolder holder, int position) {
Content superHero = superHeroes.get(position);
imageLoader = CustomVolleyRequest.getInstance(context).getImageLoader();
imageLoader.get(superHero.getImageUrl(), ImageLoader.getImageListener(holder.imageView, R.mipmap.ic_launcher, android.R.drawable.ic_dialog_alert));
holder.imageView.setImageUrl(superHero.getImageUrl(), imageLoader);
holder.textViewName.setText(superHero.getName());
holder.textViewRank.setText(String.valueOf(superHero.getRank()));
holder.textViewRealName.setText(superHero.getRealName());
holder.textViewCreatedBy.setText(superHero.getCreatedBy());
holder.textViewFirstAppearance.setText(superHero.getFirstAppearance());
String powers = "";
for(int i = 0; i<superHero.getPowers().size(); i++){
powers+= superHero.getPowers().get(i);
}
holder.textViewPowers.setText(powers);
}
@Override
public int getItemCount() {
return superHeroes.size();
}
class ViewHolder extends RecyclerView.ViewHolder{
public NetworkImageView imageView;
public TextView textViewName;
public TextView textViewRank;
public TextView textViewRealName;
public TextView textViewCreatedBy;
public TextView textViewFirstAppearance;
public TextView textViewPowers;
public ViewHolder(View itemView) {
super(itemView);
imageView = (NetworkImageView) itemView.findViewById(R.id.imageViewHero);
textViewName = (TextView) itemView.findViewById(R.id.textViewName);
textViewRank= (TextView) itemView.findViewById(R.id.textViewRank);
textViewRealName= (TextView) itemView.findViewById(R.id.textViewRealName);
textViewCreatedBy= (TextView) itemView.findViewById(R.id.textViewCreatedBy);
textViewFirstAppearance= (TextView) itemView.findViewById(R.id.textViewFirstAppearance);
textViewPowers= (TextView) itemView.findViewById(R.id.textViewPowers);
}
}
}
请帮助我找到此代码中的问题以及如何解决它...提前感谢。
答案 0 :(得分：0)
将此代码移至getData（）
下方 adapter = new CardAdapter(listSuperHeroes, getActivity());
recyclerView.setAdapter(adapter);
然后在parseData（）
之后在OnResponse（）中执行此操作 adapter .notifyDataSetChanged();
答案 1 :(得分：0)
您收到错误，因为RecyclerView为VISIBLE时没有适配器。
目前，您正在使用Adapter Fragment方法设置parseData()。 AFAIK 不设置Adapter没有任何缺点（只是发出警告错误）。但是，如果您不想要它，那么您可以在onCreateView()中添加适配器，如此
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
View v= inflater.inflate(R.layout.fragment_message, container, false);
recyclerView = (RecyclerView) v.findViewById(R.id.recyclerView);
// your code
listSuperHeroes = new ArrayList<>();
adapter = new CardAdapter(listSuperHeroes, getActivity());
// Set adapter here so you don't get warning.
recyclerView.setAdapter(adapter);
// your code
return v;
}
然后在您的parseData()方法中，只需通知Adapter数据已更改。
private void parseData(JSONArray array) {
// Your code for parsing
// Notify the adapter that data has changed and the Adapter will populate RecyclerView accordingly.
adapter.notifyDataSetChanged();
}