为什么Android 5.0.2上会抛出NoSuchFieldException:ON_STOP？

我正在使用android.arch.lifecycle扩展来检测应用程序何时在后台或前台移动：

    @OnLifecycleEvent(Lifecycle.Event.ON_STOP)
    private void onAppBackgrounded() {
        Log.i(this.getClass().getName(), "onAppBackgrounded()");
    }

除了运行在Android 5.0.2（SDK 21）上的设备外，该扩展工作正常，我在该设备上遇到以下异常：

Caused by java.lang.NoSuchFieldException: ON_STOP
       at java.lang.Class.getDeclaredField + 929(Class.java:929)
       at libcore.reflect.AnnotationAccess.decodeValue + 685(AnnotationAccess.java:685)
       at libcore.reflect.AnnotationAccess.toAnnotationInstance + 663(AnnotationAccess.java:663)
       at libcore.reflect.AnnotationAccess.toAnnotationInstance + 641(AnnotationAccess.java:641)
       at libcore.reflect.AnnotationAccess.getDeclaredAnnotation + 170(AnnotationAccess.java:170)
       at java.lang.reflect.Method.getAnnotation + 301(Method.java:301)
       at android.arch.lifecycle.ClassesInfoCache.createInfo + 124(ClassesInfoCache.java:124)
       at android.arch.lifecycle.ClassesInfoCache.hasLifecycleMethods + 59(ClassesInfoCache.java:59)
       at android.arch.lifecycle.Lifecycling.resolveObserverCallbackType + 137(Lifecycling.java:137)
       at android.arch.lifecycle.Lifecycling.getObserverConstructorType + 119(Lifecycling.java:119)
       at android.arch.lifecycle.Lifecycling.getCallback + 57(Lifecycling.java:57)
       at android.arch.lifecycle.LifecycleRegistry$ObserverWithState.(LifecycleRegistry.java:2)
       at android.arch.lifecycle.LifecycleRegistry.addObserver + 162(LifecycleRegistry.java:162)

---

请注意，

ProcessLifecycleOwner

是解决您的问题（“检测应用程序何时在后台或前台移动”）的更好方法。不过，这并不能解释这次崩溃。