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私は、AsyncTaskと定義済みのHashMapからの情報を使って、展開可能なリストに表示するコードを書いています。しかし、それはjava.util.ConcurrentModificationExceptionを投げています。次のように私のコードは次のとおりです。Androidのjava.util.ConcurrentModificationException
AsnycTask
private class BackTask extends AsyncTask<Void, Void, Void> {
ProgressDialog pd;
ArrayList<String> name;
ArrayList<Integer> quantity;
Map<String, Map<String, Integer>> cart_names1 = new HashMap<String, Map<String, Integer>>();
public BackTask(ArrayList<String> name, ArrayList<Integer> quantity) {
this.name = name;
this.quantity = quantity;
}
protected void onPreExecute() {
super.onPreExecute();
pd = new ProgressDialog(ha);
pd.setTitle("Retrieving data");
pd.setMessage("Please wait.");
pd.setCancelable(true);
pd.setIndeterminate(true);
pd.show();
}
protected Void doInBackground(Void... arg0) {
InputStream is = null;
String result = "";
try {
String link = "http://chutte.co.nf/get_item_prices.php?";
for (int b = 0; b < name.size(); b++) {
link += "names[]" + "=" + name.get(b) + "&";
}
for (int a = 0; a < quantity.size(); a++) {
link += "quantities[]" + "=" + quantity.get(a);
if (a != quantity.size() - 1) {
link += "&";
}
}
Log.e("ERROR", link);
URL url = new URL(link);
HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();
is = urlConnection.getInputStream();
} catch (Exception e) {
if (pd != null) pd.dismiss();
Log.e("ERROR", e.getMessage());
}
try {
BufferedReader reader = new BufferedReader(new InputStreamReader(is));
StringBuilder builder = new StringBuilder();
String line = null;
while ((line = reader.readLine()) != null) {
builder.append(line + "\n");
}
is.close();
result = builder.toString();
} catch (Exception e) {
Log.e("ERROR", "Error converting result " + e.toString());
}
try {
result = result.substring(result.indexOf("["));
JSONArray jsonArray = new JSONArray(result);
for (int i = 0; i < jsonArray.length(); i++) {
JSONObject jsonObject = jsonArray.getJSONObject(i);
Map<String, Integer> temmap = new HashMap<>();
String temname = jsonObject.getString("Name");
temmap.put("First", jsonObject.getInt("First"));
temmap.put("Second", jsonObject.getInt("Second"));
temmap.put("Third", jsonObject.getInt("Third"));
Log.e("ERROR", temmap.get("First").toString());
cart_names1.put(temname, temmap);
}
strhold2.clear();
strhold2.add("First");
strhold2.add("Second");
strhold2.add("Third");
String[] strhold1 = new String[strhold2.size()];
for (int i56 = 0; i56 < strhold2.size(); i56++) {
strhold1[i56] = strhold2.get(i56);
}
System.out.println(cart_names1);
Log.e("ERROR", Integer.toString(cart_names1.size()) + "IN LATEST");
if (cart_names1.size() > 1) {
System.out.println(cart_names1.size());
System.out.println(strhold2.size());
Combination.printCombination(cart_names1, strhold1, strhold2.size(), cart_names1.size(), 2);
ArrayList<String> wrong = Permutation.getlist();
System.out.println(wrong + "this is final");
setalldata(wrong);
System.out.println(wrong);
couldthis.clear();
couldthis.addAll(wrong);
} else {
Single_Permutation.getpermute(cart_names1);
System.out.println(Single_Permutation.singlelist);
couldthis.clear();
couldthis.addAll(Single_Permutation.singlelist);
setalldata(Single_Permutation.singlelist);
Log.e("ERROR", "thisis the list 1" + getdataformap());
}
} catch (Exception e) {
Log.e("ERROR", "Error pasting data " + e.toString());
}
return null;
}
@Override
protected void onPostExecute(Void result) {
/*SetMap setMap = new SetMap(getdataformap());
setMap.execute();*/
if (pd != null){ pd.dismiss();}
ListFragment.addtolist(getdataformap());
Log.e("ERROR", "This is putmap i" + getdataformap());
SetMap setMap =new SetMap(getdataformap());
setMap.execute();
}
}
}
フラグメント（拡張可能なリストを持つ）
public static class ListFragment extends Fragment {
/**
* The fragment argument representing the section number for this
* fragment.
*/
public static ExpandableListView expandablelistview;
public static CustomExpandableListAdapter expandableadapter;
public static HashMap<Fitems, List<Fnitems>> datapforput = new HashMap<>();
public static List<Fitems> mainforput = new ArrayList<>();
public static View view;
public static Context getha;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
view = inflater.inflate(R.layout.activity_listfragment, container, false);
//doddata();
expandablelistview = (ExpandableListView) view.findViewById(R.id.expandableListView);
expandableadapter = new CustomExpandableListAdapter(((Result) getActivity()).getha(), mainforput, datapforput);
expandablelistview.setAdapter(expandableadapter);
getha = ((Result) getActivity()).getha();
return view;
}
@Override
public void onStart() {
super.onStart();
Permutation.finallist = new ArrayList<>();
Single_Permutation.singlelist = new ArrayList<>();
/* doddata();
expandablelistview = (ExpandableListView) view.findViewById(R.id.expandableListView);
expandableadapter = new CustomExpandableListAdapter(((Result)getActivity()).getha(),mainforput,datapforput);
expandablelistview.setAdapter(expandableadapter);*/
}
/**
* Returns a new instance of this fragment for the given section
* number.
*/
public static void doddata() {
Fitems fitems1 = new Fitems();
Fitems fitems2 = new Fitems();
Fnitems fnitems1 = new Fnitems();
Fnitems fnitems2 = new Fnitems();
Fnitems fnitems3 = new Fnitems();
Fnitems fnitems4 = new Fnitems();
fitems1.setName("AAA");
fitems2.setName("BBB");
fnitems1.setName("AAAa");
fnitems2.setName("AAAb");
fnitems3.setName("BBBa");
fnitems4.setName("BBBb");
List<Fnitems> listfnitem1 = new ArrayList<>();
List<Fnitems> listfnitem2 = new ArrayList<>();
listfnitem1.add(fnitems1);
listfnitem1.add(fnitems2);
listfnitem2.add(fnitems3);
listfnitem2.add(fnitems4);
datapforput.put(fitems1, listfnitem1);
datapforput.put(fitems2, listfnitem2);
mainforput.add(fitems1);
mainforput.add(fitems2);
//Log.e("ERROR", "thisis the list for god's sake " + Result.couldthis+datapforput.toString());
if (Result.couldthis.size() > 0) {
for (int i = 0; i < (Result.couldthis).size(); i++) {
for (Map.Entry<Fitems, List<Fnitems>> entry : datapforput.entrySet()) {
if (Result.couldthis.get(i).equals(entry.getKey().getName())){
Fnitems fnitems5 = new Fnitems();
fnitems5.setName(Search_multiple.cart_records.get(i).getName());
entry.getValue().add(fnitems5);
}else {
Fitems fitems3 = new Fitems();
fitems3.setName(Result.couldthis.get(i));
Fnitems fnitems5 = new Fnitems();
fnitems5.setName(Search_multiple.cart_records.get(i).getName());
List<Fnitems> listfnitem3 = new ArrayList<>();
listfnitem3.add(fnitems5);
datapforput.put(fitems3, listfnitem3);
mainforput.add(fitems3);
}
}
}
}
}
public static ListFragment newInstance() {
ListFragment fragment = new ListFragment();
Log.e("ERROR", "man .... " + fragment.getTag());
return fragment;
}
public static void addtolist(ArrayList<String> dataforputting) {
// Log.e("ERROR", "thisis the list 3" + (dataforputting));
//if (expandableadapter != null){
expandableadapter.clear();//}
//Log.e("INFO", "This is mainforput" + mainforput + "This is dataforput" + datapforput);
doddata();
//Log.e("INFO", "This is mainforput" + mainforput + "This is dataforput" + datapforput);
expandableadapter = new CustomExpandableListAdapter(getha, mainforput, datapforput);
expandablelistview.setAdapter(expandableadapter);
}
}
スタック
07-13 18:16:11.955 17339-17339/nf.co.riaah.chutte E/ERROR: Inside populate Second
07-13 18:16:11.986 17339-17339/nf.co.riaah.chutte E/AndroidRuntime: FATAL EXCEPTION: main
Process: nf.co.riaah.chutte, PID: 17339
java.util.ConcurrentModificationException
at java.util.HashMap$HashIterator.nextEntry(HashMap.java:787)
at java.util.HashMap$EntryIterator.next(HashMap.java:824)
at java.util.HashMap$EntryIterator.next(HashMap.java:822)
at nf.co.riaah.chutte.Result$ListFragment.doddata(Result.java:199)
at nf.co.riaah.chutte.Result$ListFragment.addtolist(Result.java:230)
at nf.co.riaah.chutte.Result$SetMap.onPostExecute(Result.java:1049)
at nf.co.riaah.chutte.Result$SetMap.onPostExecute(Result.java:967)
at android.os.AsyncTask.finish(AsyncTask.java:636)
at android.os.AsyncTask.access$500(AsyncTask.java:177)
at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:653)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:139)
at android.app.ActivityThread.main(ActivityThread.java:5298)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:950)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:745)
代わりに、おそらくハッシュテーブルを使用します。 HashMapは並行アクセスでは安全ではありません。 – ManoDestra