我使用volley将json提取到recyclerview但它说/ RecyclerView：没有连接适配器;跳过布局，但它在模拟器上显示一行，这是最后一个json对象。我运行Debug，setter和getter变量刚收到最后一个对象。
我不知道如何解决这个问题。我一整天都在处理这个问题，
这是我在Main上的代码
public class MainActivity extends Activity {
TextView text;
String image_sm;
private List<SuperHeroes> listSuperHeroes;
// ArrayList<String> image_smm;
//Creating Views
private RecyclerView recyclerView;
RecyclerView.LayoutManager layoutManager;
private RecyclerView.Adapter adapter;
SuperHeroes superHero = new SuperHeroes();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
recyclerView = (RecyclerView) findViewById(R.id.recyclerView);
recyclerView.setHasFixedSize(true);
layoutManager = new LinearLayoutManager(this);
listSuperHeroes = new ArrayList<>();
getData();
}
private void getData(){
//Showing a progress dialog
JsonObjectRequest req = new JsonObjectRequest(Request.Method.GET,Config.DATA_URL,null,
new Response.Listener<JSONObject>() {
@Override
public void onResponse(JSONObject req) {
//Dismissing progress dialog
final ProgressDialog loading = ProgressDialog.show(MainActivity.this,"Loading Data", "Please wait...",false,false);
loading.dismiss();
//calling method to parse json array
parseData(req);
listSuperHeroes.add(superHero);
recyclerView.setLayoutManager(layoutManager);
adapter = new CardAdapter(listSuperHeroes, MainActivity.this);
recyclerView.setAdapter(adapter);
}
},
new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
VolleyLog.d("HELLO BIGBENTA", "Error: " + error.getMessage());
}
});
// //Creating request queue
// RequestQueue requestQueue = Volley.newRequestQueue(this);
//
// //Adding request to the queue
// requestQueue.add(req);
AppController.getInstance().addToRequestQueue(req);
}
private void parseData(JSONObject req) {
try {
// Parsing json array response
// loop through each json object
JSONArray json = req
.getJSONArray("worldpopulation");
for (int i = 0; i < json.length(); i++) {
JSONObject jsonOb = json
.getJSONObject(i);
superHero.setrank(jsonOb.getInt(Config.TAG_rank));
superHero.setcountry(jsonOb.getString(Config.TAG_country));
superHero.setpopulation(jsonOb.getString(Config.TAG_population));
superHero.setflag(jsonOb.getString(Config.TAG_flag));
//superHero.setFirstAppearance(json.getString(Config.TAG_image_sm));
}
} catch (JSONException e) {
e.printStackTrace();
Toast.makeText(getApplicationContext(),
"Error: " + e.getMessage(),
Toast.LENGTH_LONG).show();
}
这是我的Setter和Getters类
public class SuperHeroes {
private int rank;
private String country;
private String population;
private String flag;
public int getrank() {
return rank;
}
public void setrank(int rank) {
this.rank = rank;
}
public String getcountry() {
return country;
}
public void setcountry(String country) {
this.country = country;
}
public String getpopulation() {
return population;
}
public void setpopulation(String population) {
this.population = population;
}
public String getflag() {
return flag;
}
public void setflag(String flag) {
this.flag = flag;
}
}
这是Config类
public class Config {
public static final String DATA_URL = "http://www.androidbegin.com/tutorial/jsonparsetutorial.txt";
//Tags for my JSON
public static final String TAG_rank= "rank";
public static final String TAG_country = "country";
public static final String TAG_population = "population";
public static final String TAG_flag = "flag";
public static final String TAG_image_sm= "image_sm";
}
这是适配器类
public class CardAdapter extends RecyclerView.Adapter<CardAdapter.ViewHolder> {
private ImageLoader imageLoader;
private Context context;
//List of superHeroes
List<SuperHeroes> superHeroes;
public CardAdapter(List<SuperHeroes> 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.superheroes_list, parent, false);
ViewHolder viewHolder = new ViewHolder(v);
return viewHolder;
}
@Override
public void onBindViewHolder(ViewHolder holder, int position) {
SuperHeroes superHero = superHeroes.get(position);
imageLoader = CustomVolleyRequest.getInstance(context).getImageLoader();
imageLoader.get(superHero.getflag(), ImageLoader.getImageListener(holder.imageView, R.mipmap.ic_launcher, android.R.drawable.ic_dialog_alert));
holder.imageView.setImageUrl(superHero.getflag(), imageLoader);
holder.textViewRank.setText(String.valueOf(superHero.getrank()));
holder.textViewRealName.setText(superHero.getcountry());
holder.textViewCreatedBy.setText(superHero.getpopulation());
}
@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);
}
}
答案 0 :(得分：1)