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我正面臨着來自服務器的JSON數據中的問題保存在ArrayList在自定義適配器中調用ArrayList時返回null。自定義適配器用於在android中的微調器中列出數據。Arraylist在異步方法中返回null？
public class PhotoCommnFragment extends android.support.v4.app.Fragment {
EditText rechargeMobileNumber,rechargeAmount;
Spinner selectMenu;
int flags[] = {R.drawable.airteltv, R.drawable.aircel, R.drawable.dishtv, R.drawable.sundirect, R.drawable.tatasky, R.drawable.videocon};
List<SpinnerMenu> selectedNetwork = new ArrayList<>();
public PhotoCommnFragment() {
// Required empty public constructor
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_tab_mobile, container, false);
mobileRecahrgeHistory();
rechargeMobileNumber = (EditText)rootView.findViewById(R.id.recharge_mobile_number);
rechargeAmount = (EditText)rootView.findViewById(R.id.recharge_amount);
selectMenu = (Spinner)rootView.findViewById(R.id.selectNetwork);
settingSpinnerDropDown();
return rootView;
}
public void mobileRecahrgeHistory(){
Ion.with(this)
.load("http://192.168.1.105/TotalRecharge/?api=ol&uid=1")
.asJsonObject().withResponse()
.setCallback(new FutureCallback<Response<JsonObject>>() {
@Override
public void onCompleted(Exception e, Response<JsonObject> result) {
JSONObject json = null;
try {
json = new JSONObject(result.getResult().toString());
} catch (JSONException e1) {
e1.printStackTrace();
}
// Create the root JSONObject from the JSON string.
JSONObject jsonRootObject = null;
jsonRootObject = json.optJSONObject("DS");
//Get the instance of JSONArray that contains JSONObjects
JSONArray jsonArray = jsonRootObject.optJSONArray("LST");
//Iterate the jsonArray and print the info of JSONObjects
for(int i=0; i < jsonArray.length(); i++){
JSONObject jsonObject = null;
try {
jsonObject = jsonArray.getJSONObject(i);
} catch (JSONException e1) {
e1.printStackTrace();
}
String iph = null;
String oid = jsonObject.optString("OID").toString();
String ocd = jsonObject.optString("OCD").toString();
String opd = jsonObject.optString("OPE").toString();
String mil = jsonObject.optString("MIL").toString();
String mxl = jsonObject.optString("MXL").toString();
try {
iph = jsonObject.getString("IPH").toString();
} catch (JSONException e1) {
e1.printStackTrace();
}
String urldisplay = "http://192.168.1.105/TotalRecharge/"+iph;
Bitmap mIcon11 = null;
try {
InputStream in = new java.net.URL(urldisplay).openStream();
mIcon11 = BitmapFactory.decodeStream(in);
} catch (Exception e3) {
e3.printStackTrace();
}
SpinnerMenu spinnerData = new SpinnerMenu();
spinnerData.setOid(oid);
spinnerData.setOcd(ocd);
spinnerData.setOpd(opd);
spinnerData.setMil(mil);
spinnerData.setMix(mxl);
spinnerData.setImage(mIcon11);
selectedNetwork.add(spinnerData);
}
}
});
}
public void settingSpinnerDropDown(){
Fragment_DTH_Main_Spinner_Adapter customAdapter=new Fragment_DTH_Main_Spinner_Adapter(getActivity(),R.layout.fragment_dth_main_spinner_items,R.id.serviceName,selectedNetwork);
selectMenu.setAdapter(customAdapter);
}
。我通過調試來檢查數據是否保存在arraylist中。 我在stackoverflow refferred，你應該在你的方法中添加
Adapter.notifyDataSetChanged（）。我不知道在哪裏添加這個方法。在我的方法中調用自定義適配器之前調用的異步方法。那麼使用這種方法有什麼用處。請幫幫我。
下面的代碼是Fragment_DTH_Main_Spinner_Adapter適配器類
public class Fragment_DTH_Main_Spinner_Adapter extends ArrayAdapter<SpinnerMenu> {
Context context;
int flags[];
List<SpinnerMenu> countryNames;
LayoutInflater inflter;
public Fragment_DTH_Main_Spinner_Adapter(FragmentActivity activity, int resouceId, int textviewId, List<SpinnerMenu> data) {
// super(activity, R.layout.fragment_dth_main_spinner_items,userstories);
super(activity,resouceId,textviewId,data);
this.countryNames = data;
}
public class ViewHolder
{
TextView names;
ImageView icon;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
LayoutInflater inflater = LayoutInflater.from(getContext());
convertView = inflater.inflate(R.layout.fragment_dth_main_spinner_items, parent, false);
// convertView = inflter.inflate(fragment_dth_main_spinner_items, null);
SpinnerMenu spinnerData = countryNames.get(position);
ViewHolder viewHolder;
View result;
if(convertView == null){
viewHolder = new ViewHolder();
viewHolder.icon = (ImageView) convertView.findViewById(R.id.imageView);
viewHolder.names = (TextView) convertView.findViewById(R.id.serviceName);
result = convertView;
}
else {
viewHolder = (ViewHolder) convertView.getTag();
result = convertView;
}
// viewHolder.icon.setImageBitmap(spinnerData.getImage());
// Glide.with(context).load(spinnerData.getImages()).into(viewHolder.icon);
viewHolder.names.setText(spinnerData.getOpd());
return convertView;
}
}
定製適配器異步方法，但adapter.notifyDataSetChanged（）後初始化被稱爲撥打notifydatasetchanged在異步方法中。這將導致空指針異常 –
這將/不應該導致空指針。請試試 –
仍然沒有解決問題，它的返回空值 –