我使用Realm作爲我的數據庫。雖然插入/更新數據我收到以下錯誤併發修改異常在onPostExecute方法中寫入領域 - Android
FATAL EXCEPTION: main
Process: uk.org.humanfocus.hfi, PID: 6430
java.util.ConcurrentModificationException
at java.util.ArrayList$ArrayListIterator.next(ArrayList.java:573)
at org.json.JSONArray.writeTo(JSONArray.java:612)
at org.json.JSONStringer.value(JSONStringer.java:233)
at org.json.JSONObject.writeTo(JSONObject.java:720)
at org.json.JSONObject.toString(JSONObject.java:689)
at uk.org.humanfocus.hfi.DriverBehavior.DriverBehaviorMap$InsertCarProbeData.onPostExecute(DriverBehaviorMap.java:252)
at uk.org.humanfocus.hfi.DriverBehavior.DriverBehaviorMap$InsertCarProbeData.onPostExecute(DriverBehaviorMap.java:229)
at android.os.AsyncTask.finish(AsyncTask.java:651)
at android.os.AsyncTask.-wrap1(AsyncTask.java)
at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:668)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5443)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:728)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618)
不像其他人我沒有做它在for循環,代替我做它的AsyncTask的onPostExecute方法是從位置稱爲改變了聽衆。它們也不在別的地方使用。
private class InsertCarProbeData extends AsyncTask<Void, Void, Void> {
Location location;
public InsertCarProbeData(Location location) {
this.location = location;
}
@Override
protected Void doInBackground(Void... params) {
try {
addObjectToJSONArray(location);
} catch (JSONException e) {
e.printStackTrace();
}
return null;
}
@Override
protected void onPostExecute(Void aVoid) {
super.onPostExecute(aVoid);
realm.beginTransaction();
trip.json = tripJSON.toString();
realm.commitTransaction();
}
}
這的AsyncTask被從這裏叫
new InsertCarProbeData(location).execute();
親愛Downvoter,在下降的情況下,投票請評論原因,以便將來避免我的錯誤。 – Salmaan
如果沒有關於addObjectToJSONArray的知識,我敢打賭''tripJSON.toString()'與addObjectToJSONArray(location);'(它在99%執行'tripJSON'的同時被調用) – Selvin
關於downvote:我敢打賭[this] (http://stackoverflow.com/help/how-to-ask)可能會幫助...和[this](http://stackoverflow.com/help/mcve) – Selvin