遍历ConcurrentModificationException时得到ArrayList。
我做了什么:
1. activity has a ArrayList<Callable>
2. add Callable to ArrayList when AsyncTask.onPostExecute
3. traverse the ArrayList to call the callable in onResumeFragments
如何触发异常:
我制作了
AsyncTask.execute()并快速按下主页按钮，当我的应用回到前台时，发生了异常。让我感到困惑的是:
如果
AsyncTask.onPostExecute和FragmentActivity.onResumeFragments在同一线程上运行，不会有
java.util.ConcurrentModificationException，对吧？这是我的异常堆栈
com.yumei.sdkdemo I/PayMethodActivity:
11-10 11:34:35.218 10030-10030/com.yumei.sdkdemo E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.yumei.sdkdemo, PID: 10030
java.lang.RuntimeException: Unable to resume activity {com.yumei.sdkdemo/com.yumei.sdk.PayMethodActivity}: java.util.ConcurrentModificationException
at android.app.ActivityThread.performResumeActivity(ActivityThread.java:2954)
at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:2985)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1327)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5235)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:906)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:701)
Caused by: java.util.ConcurrentModificationException
at java.util.ArrayList$ArrayListIterator.next(ArrayList.java:573)
at com.yumei.sdk.PayMethodFragmentActivity.onResumeFragments(PayMethodActivity.java:116)
at android.support.v4.app.FragmentActivity.onPostResume(FragmentActivity.java:451)
at android.support.v7.app.AppCompatActivity.onPostResume(AppCompatActivity.java:141)
at android.app.Activity.performResume(Activity.java:6040)
at android.app.ActivityThread.performResumeActivity(ActivityThread.java:2943)
at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:2985)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1327)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5235)
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:906)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:701)
感谢您的答复。
最佳答案
请注意，如果要在遍历时删除某些项目，则应使用Iterator。并且如果您不是在UI线程上创建的AsynTask，请确保使用线程安全的。