java - 线程中的 ParseUser 和 ParseObject 导致 ANR

Question

我的 Android 应用程序有问题。当应用程序尝试保存 ParseObject 时，有时它会阻止 UI 并生成 ANR。根据生成的traces.txt，只涉及到我写的一个方法，就是saveClimbing。此方法简单地调用 ParseObject 上的 onSaveBackground:

public static void saveClimbing(final ParseObject p_climbing, final Climbing l_climbing){
p_climbing.saveInBackground(new SaveCallback() {    
                @Override
                public void done(ParseException ex) {
                    if(ex == null){
                        //no problems
                        l_climbing.setSaved(true);
                        ClimbApplication.climbingDao.update(l_climbing);
                        Log.i(getClass().getName(), "Climbing correctly saved in Parse");
                    }else{
                        l_climbing.setSaved(false);
                        ClimbApplication.climbingDao.update(l_climbing);
                        Log.e(getClass().getName(), ex.getMessage());
                    }

                }
            }); 
}

另一个涉及的方法是 ParseUser.saveCurrentUserAsync，它会导致饥饿，但我无法理解它是何时被调用的，它是导致这种情况的原因。我做错了什么吗？

这是 traces.txt 的第一部分:

JNI: CheckJNI is off; workarounds are off; pins=0; globals=180 (plus 1 weak)

DALVIK THREADS:
(mutexes: tll=0 tsl=0 tscl=0 ghl=0)

"main" prio=5 tid=1 MONITOR
  | group="main" sCount=1 dsCount=0 obj=0x41700578 self=0x4009c120
  | sysTid=26943 nice=0 sched=0/0 cgrp=apps handle=1074999292
  | state=S schedstat=( 0 0 0 ) utm=3698 stm=442 core=0
  at com.parse.ParseUser.getSessionToken(ParseUser.java:~439)
  - waiting to lock <0x41fec980> (a java.lang.Object) held by tid=21         (Task.BACKGROUND_EXECUTOR-thread-47)
  at com.parse.ParseUser.getCurrentSessionToken(ParseUser.java:963)
  at com.parse.ParseObject.saveAsync(ParseObject.java:1348)
  at com.parse.ParseObject$9.then(ParseObject.java:1337)
  at com.parse.ParseObject$9.then(ParseObject.java:1333)
  at com.parse.TaskQueue.enqueue(TaskQueue.java:58)
  at com.parse.ParseObject.saveAsync(ParseObject.java:1333)
  at com.parse.ParseObject.saveInBackground(ParseObject.java:1424)
  at org.unipd.nbeghin.climbtheworld.util.ParseUtils.saveClimbing(ParseUtils.java:40)
  at org.unipd.nbeghin.climbtheworld.ClimbActivity$8.done(ClimbActivity.java:1422)
  at com.parse.FindCallback.internalDone(FindCallback.java:45)
  at com.parse.FindCallback.internalDone(FindCallback.java:31)
  at com.parse.Parse$6$1.run(Parse.java:917)
  at android.os.Handler.handleCallback(Handler.java:730)
  at android.os.Handler.dispatchMessage(Handler.java:92)
  at android.os.Looper.loop(Looper.java:137)
  at android.app.ActivityThread.main(ActivityThread.java:5103)
  at java.lang.reflect.Method.invokeNative(Native Method)
  at java.lang.reflect.Method.invoke(Method.java:525)
  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737)
  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
  at dalvik.system.NativeStart.main(Native Method)

"Task.BACKGROUND_EXECUTOR-thread-47" prio=5 tid=21 MONITOR
  | group="main" sCount=1 dsCount=0 obj=0x4364af68 self=0x5b3d9cd0
  | sysTid=28045 nice=0 sched=0/0 cgrp=apps handle=1597635584
  | state=S schedstat=( 0 0 0 ) utm=0 stm=0 core=1
  at com.parse.ParseUser.saveCurrentUserAsync(ParseUser.java:~971)
  - waiting to lock <0x41fd7df8> (a java.lang.Object) held by tid=1 (main)
  at com.parse.ParseUser.access$000(ParseUser.java:20)
  at com.parse.ParseUser$1.then(ParseUser.java:476)
  at com.parse.ParseUser$1.then(ParseUser.java:469)
  at com.parse.Task$11.run(Task.java:481)
  at com.parse.Task$ImmediateExecutor.execute(Task.java:673)
  at com.parse.Task.completeAfterTask(Task.java:477)
  at com.parse.Task.continueWithTask(Task.java:353)
  at com.parse.Task.continueWithTask(Task.java:364)
  at com.parse.Task$9.then(Task.java:410)
  at com.parse.Task$9.then(Task.java:402)
  at com.parse.Task$11.run(Task.java:481)
  at com.parse.Task$ImmediateExecutor.execute(Task.java:673)
  at com.parse.Task.completeAfterTask(Task.java:477)
  at com.parse.Task.access$400(Task.java:22)
  at com.parse.Task$7.then(Task.java:346)
  at com.parse.Task$7.then(Task.java:343)
  at com.parse.Task.runContinuations(Task.java:510)
  at com.parse.Task.access$800(Task.java:22)
  at com.parse.Task$TaskCompletionSource.trySetResult(Task.java:565)
  at com.parse.Task$TaskCompletionSource.setResult(Task.java:599)
  at com.parse.Task$11$1.then(Task.java:493)
  at com.parse.Task$11$1.then(Task.java:485)
  at com.parse.Task$10.run(Task.java:448)
  at com.parse.Task$ImmediateExecutor.execute(Task.java:673)
  at com.parse.Task.completeImmediately(Task.java:444)
  at com.parse.Task.access$300(Task.java:22)
  at com.parse.Task$6.then(Task.java:311)
  at com.parse.Task$6.then(Task.java:308)
  at com.parse.Task.runContinuations(Task.java:510)
  at com.parse.Task.access$800(Task.java:22)
  at com.parse.Task$TaskCompletionSource.trySetResult(Task.java:565)
  at com.parse.Task$TaskCompletionSource.setResult(Task.java:599)
  at com.parse.Task$11$1.then(Task.java:493)
  at com.parse.Task$11$1.then(Task.java:485)
  at com.parse.Task$10.run(Task.java:448)
  at com.parse.Task$ImmediateExecutor.execute(Task.java:673)
  at com.parse.Task.completeImmediately(Task.java:444)
  at com.parse.Task.access$300(Task.java:22)
  at com.parse.Task$6.then(Task.java:311)
  at com.parse.Task$6.then(Task.java:308)
  at com.parse.Task.runContinuations(Task.java:510)
  at com.parse.Task.access$800(Task.java:22)
  at com.parse.Task$TaskCompletionSource.trySetResult(Task.java:565)
  at com.parse.Task$TaskCompletionSource.setResult(Task.java:599)
  at com.parse.Task$11$1.then(Task.java:493)
  at com.parse.Task$11$1.then(Task.java:485)
  at com.parse.Task$10.run(Task.java:448)
  at com.parse.Task$ImmediateExecutor.execute(Task.java:673)
  at com.parse.Task.completeImmediately(Task.java:444)
  at com.parse.Task.continueWith(Task.java:318)
  at com.parse.Task.continueWith(Task.java:329)
  at com.parse.Task$11.run(Task.java:485)
  at com.parse.Task$ImmediateExecutor.execute(Task.java:673)
  at com.parse.Task.completeAfterTask(Task.java:477)
  at com.parse.Task.access$400(Task.java:22)
  at com.parse.Task$7.then(Task.java:346)
  at com.parse.Task$7.then(Task.java:343)
  at com.parse.Task.runContinuations(Task.java:510)
  at com.parse.Task.access$800(Task.java:22)
  at com.parse.Task$TaskCompletionSource.trySetResult(Task.java:565)
  at com.parse.ParseRequest$4.then(ParseRequest.java:324)
  at com.parse.ParseRequest$4.then(ParseRequest.java:316)
  at com.parse.Task$11.run(Task.java:481)
  at com.parse.Task$ImmediateExecutor.execute(Task.java:673)
  at com.parse.Task.completeAfterTask(Task.java:477)
  at com.parse.Task.access$400(Task.java:22)
  at com.parse.Task$7.then(Task.java:346)
  at com.parse.Task$7.then(Task.java:343)
  at com.parse.Task.runContinuations(Task.java:510)
  at com.parse.Task.access$800(Task.java:22)
  at com.parse.Task$TaskCompletionSource.trySetResult(Task.java:565)
  at com.parse.Task$TaskCompletionSource.setResult(Task.java:599)
  at com.parse.Task$11$1.then(Task.java:493)
  at com.parse.Task$11$1.then(Task.java:485)
  at com.parse.Task$10.run(Task.java:448)
  at com.parse.Task$ImmediateExecutor.execute(Task.java:673)
  at com.parse.Task.completeImmediately(Task.java:444)
  at com.parse.Task.continueWith(Task.java:318)
  at com.parse.Task.continueWith(Task.java:329)
  at com.parse.Task$11.run(Task.java:485)
  at com.parse.Task$ImmediateExecutor.execute(Task.java:673)
  at com.parse.Task.completeAfterTask(Task.java:477)
  at com.parse.Task.access$400(Task.java:22)
  at com.parse.Task$7.then(Task.java:346)
  at com.parse.Task$7.then(Task.java:343)
  at com.parse.Task.runContinuations(Task.java:510)
  at com.parse.Task.access$800(Task.java:22)
  at com.parse.Task$TaskCompletionSource.trySetResult(Task.java:565)
  at com.parse.Task$TaskCompletionSource.setResult(Task.java:599)
  at com.parse.Task$11$1.then(Task.java:493)
  at com.parse.Task$11$1.then(Task.java:485)
  at com.parse.Task$10.run(Task.java:448)
  at com.parse.Task$ImmediateExecutor.execute(Task.java:673)
  at com.parse.Task.completeImmediately(Task.java:444)
  at com.parse.Task.access$300(Task.java:22)
  at com.parse.Task$6.then(Task.java:311)
  at com.parse.Task$6.then(Task.java:308)
  at com.parse.Task.runContinuations(Task.java:510)
  at com.parse.Task.access$800(Task.java:22)
  at com.parse.Task$TaskCompletionSource.trySetResult(Task.java:565)
  at com.parse.Task$TaskCompletionSource.setResult(Task.java:599)
  at com.parse.Task$11$1.then(Task.java:493)
  at com.parse.Task$11$1.then(Task.java:485)
  at com.parse.Task$10.run(Task.java:448)
  at com.parse.Task$ImmediateExecutor.execute(Task.java:673)
  at com.parse.Task.completeImmediately(Task.java:444)
  at com.parse.Task.access$300(Task.java:22)
  at com.parse.Task$6.then(Task.java:311)
  at com.parse.Task$6.then(Task.java:308)
  at com.parse.Task.runContinuations(Task.java:510)
  at com.parse.Task.access$800(Task.java:22)
  at com.parse.Task$TaskCompletionSource.trySetResult(Task.java:565)
  at com.parse.Task$TaskCompletionSource.setResult(Task.java:599)
  at com.parse.Task$11$1.then(Task.java:493)
  at com.parse.Task$11$1.then(Task.java:485)
  at com.parse.Task$10.run(Task.java:448)
  at com.parse.Task$ImmediateExecutor.execute(Task.java:673)
  at com.parse.Task.completeImmediately(Task.java:444)
  at com.parse.Task.continueWith(Task.java:318)
  at com.parse.Task.continueWith(Task.java:329)
  at com.parse.Task$11.run(Task.java:485)
  at com.parse.Task$ImmediateExecutor.execute(Task.java:673)
  at com.parse.Task.completeAfterTask(Task.java:477)
  at com.parse.Task.access$400(Task.java:22)
  at com.parse.Task$7.then(Task.java:346)
  at com.parse.Task$7.then(Task.java:343)
  at com.parse.Task.runContinuations(Task.java:510)
  at com.parse.Task.access$800(Task.java:22)
  at com.parse.Task$TaskCompletionSource.trySetResult(Task.java:565)
  at com.parse.Task$TaskCompletionSource.setResult(Task.java:599)
  at com.parse.Task$11$1.then(Task.java:493)
  at com.parse.Task$11$1.then(Task.java:485)
  at com.parse.Task$10.run(Task.java:448)
  at com.parse.Task$ImmediateExecutor.execute(Task.java:673)
  at com.parse.Task.completeImmediately(Task.java:444)
  at com.parse.Task.continueWith(Task.java:318)
  at com.parse.Task.continueWith(Task.java:329)
  at com.parse.Task$11.run(Task.java:485)
  at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1080)
  at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:573)
  at java.lang.Thread.run(Thread.java:841)

编辑:与此同时，我还在代码的另一部分使用 saveInBackground 方法保存了一个 ParseUser 对象。看来ANR是在ParseUser对象的saveInBackground执行时，saveClimbing调用的saveInBackground尝试执行时引起的。 ANR 只是有时发生，而不是在每次执行时发生。我做错了什么吗？

编辑:这似乎是一个错误 (https://developers.facebook.com/bugs/591538734311827/)。我将尝试使用新的 android Parse SDK 来查看死锁是否消失。

Answer 1

已解决:我使用的是 Parse Android SDK v1.7.1，它有一个错误。此错误会导致死锁并导致 UI 阻塞并生成 ANR。新版本1.8.0修复了该bug。