当我运行以下代码时，我得到并发修改例外，我有2个哈希，第一个用数据填充第二个哈希，之后我必须从第二个哈希中删除数据，如果我从我获得成功的消息API，我做错了什么？
HashTask.putAll(Maps.difference(aMap, HashTask).entriesOnlyOnLeft());
aMap.clear();
class update extends TimerTask {
public void run() {
GPSTracker gps = new GPSTracker(getActivity());
String idsAlunos = "";
for (Map.Entry<String, GPSEscolas> e : HashTask.entrySet()) {
String id_escola = e.getKey();
String ids_aluno = e.getValue().getAlunos();
Float latitude = e.getValue().getLatitude();
Float longitude = e.getValue().getLongitude();
double latitudegps = gps.getLatitude();
double longitudegps = gps.getLongitude();
idsAlunos += ";" + ids_aluno;
LatLng latLng = new LatLng(latitude, longitude);
drawMarkerWithCircle(latLng);
float[] distance = new float[2];
Location.distanceBetween(mCircle.getCenter().latitude, mCircle.getCenter().longitude, latitudegps, longitudegps, distance);
if (distance[0] < mCircle.getRadius()) {
try {
AlertRest mAlertRest = new AlertRest();
mAlertRest.postNotificacao(getActivity(), id_escola, idsAlunos.substring(1), latitudegps, longitudegps);
if (mAlertRest.resposta[0].equals("200")) {
mAlertRest.mJSONObject.optString("mensagem");
NotificationCompat.Builder mBuilder =
new NotificationCompat.Builder(getActivity())
.setSmallIcon(R.drawable.ic_clickicon)
.setContentTitle("aaa")
.setContentText("Seu filho ta pronto")
.setVibrate(new long[]{1000, 1000, 1000, 1000, 1000})
.setLights(Color.RED, 3000, 3000);
Intent resultIntent = new Intent(getActivity(), MainFragment.class);
TaskStackBuilder stackBuilder = TaskStackBuilder.create(getActivity());
stackBuilder.addParentStack(getActivity());
stackBuilder.addNextIntent(resultIntent);
PendingIntent resultPendingIntent =
stackBuilder.getPendingIntent(
0,
PendingIntent.FLAG_UPDATE_CURRENT
);
mBuilder.setContentIntent(resultPendingIntent);
NotificationManager mNotificationManager =
(NotificationManager) getActivity().getSystemService(Context.NOTIFICATION_SERVICE);
mNotificationManager.notify(0, mBuilder.build());
HashTask.remove(id_escola);
Toast.makeText(getActivity(), mAlertRest.mJSONObject.optString("mensagem"), Toast.LENGTH_LONG).show();
} else if (mAlertRest.resposta[0].equals("422")) {
mAlertRest.mJSONObject.optString("mensagem");
Toast.makeText(getActivity(), mAlertRest.mJSONObject.optString("mensagem"), Toast.LENGTH_LONG).show();
}
} catch (Exception er) {
er.printStackTrace();
}
}
}
}
});
} catch (Exception e) {
e.printStackTrace();
}
}
}
Timer timer = new Timer();
timer.schedule(new update(), 0, 15000);
日志：
Process: com., PID: 20574
java.util.ConcurrentModificationException
at java.util.HashMap$HashIterator.nextEntry(HashMap.java:806)
at java.util.HashMap$EntryIterator.next(HashMap.java:843)
at java.util.HashMap$EntryIterator.next(HashMap.java:841)
at com.MainFragment$asyncTask$1$1$1update$1.run(MainFragment.java:259)
at android.os.Handler.handleCallback(Handler.java:733)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:136)
at android.app.ActivityThread.main(ActivityThread.java:5086)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:785)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:601)
at dalvik.system.NativeStart.main(Native Method)
259：for（Map.Entry e：HashTask.entrySet（））