Android Navigation Architecture not navigating when phone screen is OFF

Question

I have the following architecture in my project:

MainActivity layout:

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <fragment
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:id="@+id/my_nav_host_fragment"
        android:name="androidx.navigation.fragment.NavHostFragment"
        app:navGraph="@navigation/nav_graph"
        app:defaultNavHost="true"
        />

</android.support.constraint.ConstraintLayout>

nav_graph design:

nav_graph xml:

<?xml version="1.0" encoding="utf-8"?>
<navigation xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto" android:id="@+id/nav_graph"
    app:startDestination="@id/loginFragment">

    <fragment
        android:id="@+id/loginFragment"
        android:name="com.example.LoginFragment"
        android:label="LoginFragment" >
        <action
            android:id="@+id/loginToContentAction"
            app:destination="@id/contentFragment" />
    </fragment>
    <fragment
        android:id="@+id/contentFragment"
        android:name="com.example.ContentFragment"
        android:label="ContentFragment" />
</navigation>

In the LoginFragment, I have the following logic:

override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
    super.onViewCreated(view, savedInstanceState)
    if(presenter.isUserLogged()) {
        // getNav() returns NavController from the MainActivity
        getNav().navigateTo(R.id.loginToContentAction)
        return
    }

    // init login views etc
}

It works perfectly if the phone screen is turned ON, but (for example) if I deploy build via Android Studio, and phone screen is OFF, it will not navigate to ContentFragment and stay in the LoginFragment. I debugged the situation, and code enters NavController.navigate(R.id.loginToContentAction) and steps into it, but it doesn't actually navigate. Any ideas what might be a cause of this?

Activities are usually paused when the screen turns off, or get paused if the screen is turned off. It might be pausing at a weird point, which messes up the flow. — TheWanderer, Sep 17 '18 at 13:59
I'm running into the same issue. Did you ever find a solution? — Julio E. Rodríguez Cabañas, Nov 24 '19 at 18:55
Same problem here. I have tried adquiring a partial wake lock, but it did not work. In My case is a navigation that happens when a quick process ends in bkg, but if the user press the power button during it, the navigation is called but does not happens. — Miguel Sesma, Sep 04 '20 at 11:17

score 0 · Answer 1 · answered Mar 19 '20 at 10:21

0

I am exactly in the same situation. I didn't find a clean solution yet, and the only workaround for me it's to skip the navigation if screen is off. Then in "onStart", I perform the previously skipped navigation.

answered Mar 19 '20 at 10:21

Osvaldo

1
2

Kamal Nayan · Answer 2 · 2023-05-18T01:02:50.950

Probably, I have solved this problem.

lifecycleScope.launchWhenResumed {
    findNavController().navigate( R.id.YOUR_ACTION_ID)
}

Furthermore, this extension function can be used to do any task with delay when fragment is in started state.

This extension function can be used to navigate when the screen is turned on or normally after a delay.

fun Fragment.doWithDelay(delay: Long, performTask: () -> Unit) {
    Timer().schedule(timerTask {
        lifecycleScope.launch {
            lifecycle.repeatOnLifecycle(Lifecycle.State.STARTED) {
                if (!this@doWithDelay.isDetached && this@doWithDelay.isAdded)
                    this@doWithDelay.activity?.runOnUiThread { performTask.invoke() }
            }
        }
    }, delay)
}

How to use :

 doWithDelay(YOUR_REQUIRED_DELAY) {
       findNavController().navigate(R.id.YOUR_NAVIGATION_ACTION_ID)
 }

It's working fine for me. If I'm wrong, kindly make me correct.

Android Navigation Architecture not navigating when phone screen is OFF

2 Answers2