IssueTracker

Library version used: 1.0.0-rc01(same for beta01) Devices/Android versions reproduced on: Pixel 5/11 Android Auto version reproduced on: 6.1.610544-release

I have a Screen that observes a LiveData, and pops itself when some condition meets. The observer will run on start, so the screen will also be popped on start.

class SomeScreen(carContext: CarContext) : Screen(carContext) {
    private val someLiveData = ...
        
    init {
        someLiveData.observe(this) {
            if (someCondition) {
                screenManager.pop()
            }
        }
    }

    ...
}

The above code works well. However, when I add a LifecycleObserver to the screen's lifecycle, the app crashes.

class SomeScreen(carContext: CarContext) : Screen(carContext) {
    private val someLiveData = ...
        
    init {
        lifecycle.addObserver(object : DefaultLifecycleObserver {}) // <- this change

        someLiveData.observe(this) {
            if (someCondition) {
                screenManager.pop()
            }
        }
    }

    ...
}

Stack trace:

java.lang.RuntimeException: java.lang.IllegalStateException: no event up from DESTROYED
    at androidx.car.app.utils.RemoteUtils.lambda$dispatchHostCall$0(RemoteUtils.java:121)
    at androidx.car.app.utils.-$$Lambda$RemoteUtils$hqdRHUgQFt6LDam0B8zarqtlYt0.run(Unknown Source:6)
    at android.os.Handler.handleCallback(Handler.java:938)
    at android.os.Handler.dispatchMessage(Handler.java:99)
    at android.os.Looper.loop(Looper.java:223)
    at android.app.ActivityThread.main(ActivityThread.java:7660)
    at java.lang.reflect.Method.invoke(Native Method)
    at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:592)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:947)
 Caused by: java.lang.IllegalStateException: no event up from DESTROYED
    at androidx.lifecycle.LifecycleRegistry.forwardPass(LifecycleRegistry.java:263)
    at androidx.lifecycle.LifecycleRegistry.sync(LifecycleRegistry.java:307)
    at androidx.lifecycle.LifecycleRegistry.moveToState(LifecycleRegistry.java:148)
    at androidx.lifecycle.LifecycleRegistry.handleLifecycleEvent(LifecycleRegistry.java:134)
    at androidx.car.app.Screen.lambda$dispatchLifecycleEvent$1$Screen(Screen.java:321)
    at androidx.car.app.-$$Lambda$Screen$QLPRkJyaz7mYtbbcK-oQ2Y-L480.run(Unknown Source:4)
    at androidx.car.app.utils.ThreadUtils.runOnMain(ThreadUtils.java:39)
    at androidx.car.app.Screen.dispatchLifecycleEvent(Screen.java:315)
    at androidx.car.app.ScreenManager.pushInternal(ScreenManager.java:260)
    at androidx.car.app.ScreenManager.push(ScreenManager.java:80)