IssueTracker

Got this error with activity 1.8.2 if registering like in the documentation:

val getContent = registerForActivityResult(GetContent()) { uri: Uri? ->
    // Handle the returned Uri
}

override fun onCreate(savedInstanceState: Bundle?) {
    // ...

    val selectButton = findViewById<Button>(R.id.select_button)

    selectButton.setOnClickListener {
        // Pass in the mime type you want to let the user select
        // as the input
        getContent.launch("image/*")
    }
}

Every time I returned to the first activity, if I tried to launch the "getContent" again the app would crash. The only way I was able to get it to work was to registerForActivityResult in onCreate() like this:

lateinit var getContent: <ActivityResultLauncher<Contract...>>

override fun onCreate(savedInstanceState: Bundle?) {
    // ...

    getContent = registerForActivityResult(GetContent()) { uri: Uri? ->
        // Handle the returned Uri
    }

    val selectButton = findViewById<Button>(R.id.select_button)

    selectButton.setOnClickListener {
        // Pass in the mime type you want to let the user select
        // as the input
        getContent.launch("image/*")
    }
}

Re comment#9 - please file a new issue with a sample project that reproduces your issue.

We're currently hitting this issue in our WIP app. https://github.com/lineage-next/android_packages_apps_Twelve

We use our own wrapper around registerForActivityResult called PermissionsGatedCallback. We are able to hit the crash with the following:

• Go to library
• Pick any album
• Pick any song
• Back gesture (onto album fragment)
• Back gesture (onto library fragment)
• retry:
• • Pick any album
• • Back gesture (onto album fragment)
• • Go to Artists (by swiping or navbar, doesn't matter)
• • Pick any artist
• • Back gesture (onto library fragment)
• goto retry

I know the repro is rather tedious, but it's hard to repro even for us.

If done enough times you'll see java.lang.IllegalStateException: Attempting to launch an unregistered ActivityResultLauncher with contract androidx.activity.result.contract.ActivityResultContracts$RequestMultiplePermissions@d8b0d98 and input [Ljava.lang.String;@de949f1. You must ensure the ActivityResultLauncher is registered before calling launch().

Calling registerForActivityResult each time solves the issue as pointed earlier, as wrong as that can be. Also as crazy as that sounds making the contract launcher lazy (with re-init in case of null) and setting it to null on the lifecycle destroy event solves the issue as a whole.

To me that sounds possible only if somehow .launch is called when the fragment is destroyed, but the actual contract is still tied to the old fragment. Which sounds a lot scarier than the actual crash.

Re comment#11 - please file a new issue.