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fun foo() { val job = launch(UI) { try { Log.d("TAG","Start coroutIne") run(CommonPool) { Log.d("TAG","Start bg task") // Intentionally make bg task running for a long time SystemClock.sleep(2000) Log.d("TAG","Throw bg task exception") throw RuntimeException("Bg task exception") } } catch (e: Exception) { Log.e("TAG","Handle coroutIne exception",E) } } launch(UI) { delay(1000) Log.d("TAG","Cancel job = ${job.cancel()}") }
}
07-26 15:09:10.038 31518-31518/co.foo.bar D/MainActivity: Start coroutIne 07-26 15:09:10.044 31518-31547/co.foo.bar D/MainActivity: Start bg task 07-26 15:09:11.046 31518-31518/co.foo.bar D/MainActivity: Cancel job = true 07-26 15:09:11.047 31518-31518/co.foo.bar E/MainActivity: Handled coroutIne exception java.util.concurrent.CancellationException: Job was cancelled at kotlinx.coroutines.experimental.JobSupport$CompletedExceptionally.getException(Job.kt:921) at kotlinx.coroutines.experimental.RunCompletion.afterCompletion(Builders.kt:198) ... at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:776) 07-26 15:09:12.046 31518-31547/co.foo.bar D/MainActivity: Throwing bg task exception --------- beginning of crash 07-26 15:09:12.046 31518-31547/co.foo.bar E/AndroidRuntime: FATAL EXCEPTION: ForkJoinPool.commonPool-worker-1 Process: co.foo.bar,PID: 31518 java.lang.RuntimeException: Bg task exception at co.foo.barsample.MainActivity$onCreate$1$job$1$1.doResume(MainActivity.kt:36) at kotlin.coroutInes.experimental.jvm.internal.CoroutIneImpl.resume(CoroutIneImpl.kt:54) at kotlinx.coroutines.experimental.DispatchTask.run(CoroutIneDispatcher.kt:120) at java.util.concurrent.ForkJoinTask$RunnableExecuteAction.exec(ForkJoinTask.java:1383) at java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:256) at java.util.concurrent.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1123) at java.util.concurrent.ForkJoinPool.scan(ForkJoinPool.java:1961) at java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1909) at java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:128) 07-26 15:09:12.050 1705-2190/system_process W/Activitymanager: Force finishing activity co.foo.bar/co.foo.barsample.MainActivity
似乎是调用cancel()抛出了成功捕获的CancellationException.但是没有捕获后续的RuntimeException.我认为在取消作业后,以下异常应该被lib忽略?或者如何在不抛出CancellationException异常的情况下静默取消作业?
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