Kotlin协程导致的RuntimeException

在测试的时候发现协程报出来的问题

2020-12-10 17:50:58.877 3078-3078/package E/AndroidRuntime: FATAL EXCEPTION: main
    Process: package, PID: 3078
    java.lang.RuntimeException: Unable to stop service package.FontsProKeyboard@68e0797: kotlinx.coroutines.JobCancellationException: BlockingCoroutine was cancelled; job=BlockingCoroutine{Cancelled}@b94644b
        at android.app.ActivityThread.handleStopService(ActivityThread.java:4377)
        at android.app.ActivityThread.access$1900(ActivityThread.java:269)
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2047)
        at android.os.Handler.dispatchMessage(Handler.java:107)
        at android.os.Looper.loop(Looper.java:237)
        at android.app.ActivityThread.main(ActivityThread.java:7860)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1075)
     Caused by: kotlinx.coroutines.JobCancellationException: BlockingCoroutine was cancelled; job=BlockingCoroutine{Cancelled}@b94644b

一直断点排查发现执行完在

    /**
 * Cancels all coroutines and cleans up
 */
override fun onDestroy() {
    runBlocking {
        cancel()
    }
}

出现的问题，才发现一开始声明的

   private val mainScope = MainScope()

应该这样写

     /**
     * Cancels all coroutines and cleans up
     */
    override fun onDestroy() {
        runBlocking {
            mainScope.cancel()
        }
    }