如何解决错误“LifecycleOwners must call register before they are STARTED”

Question

我registerForActivityResult在我的开发中使用 谷歌登录实现。一切正常，直到我将片段依赖项升级到 1.3.0-beta01。应用程序当前崩溃并出现错误java.lang.IllegalStateException: LifecycleOwner SignupChoicesFragment{8e0e269} (193105b9-afe2-4941-a368-266dbc433258) id=0x7f090139} is attempting to register while current state is RESUMED. LifecycleOwners must call register before they are STARTED.

我在 oncreate 之前使用了延迟加载的函数，但它仍然无法工作。

class SignupChoicesFragment : DaggerFragment() {

    @Inject
    lateinit var viewModelProviderFactory: ViewModelFactory
    val userViewModel: UserViewModel by lazy {
        ViewModelProvider(this, viewModelProviderFactory).get(UserViewModel::class.java)
    }

    @Inject
    lateinit var mGoogleSignInClient:GoogleSignInClient

    val arg:SignupChoicesFragmentArgs by navArgs()

    override fun onCreateView(
        inflater: LayoutInflater, container: ViewGroup?,
        savedInstanceState: Bundle?
    ): View? {
        // Inflate the layout for this fragment
        return inflater.inflate(R.layout.fragment_signup_choices, container, false)
    }

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

     
        google_sign_in_button.setOnClickListener {

            val intent = mGoogleSignInClient.signInIntent

            val launcher = registerForActivityResult(ActivityResultContracts.StartActivityForResult(), ActivityResultCallback {result->
                if (result.resultCode == Activity.RESULT_OK) {
                    val task = GoogleSignIn.getSignedInAccountFromIntent(result.data)
                    task.addOnCompleteListener {
                        if (it.isSuccessful) {
                            val account: GoogleSignInAccount? =
                                it.getResult(ApiException::class.java)
                            val idToken = it.result?.idToken
                            val email = account?.email
                            val lastName = account?.familyName
                            val firstName = account?.givenName
                            val otherName = account?.displayName
                            val imageUrl = account?.photoUrl
                            val category = arg.category
                            val newUser = User()
                            newUser.firstName = firstName
                            newUser.lastName = lastName
                            newUser.otherName = otherName
                            newUser.category = category
                            newUser.email = email
                            newUser.imageUrl = imageUrl.toString()
                            userViewModel.currentUser = newUser
                            newUser.token = idToken

                            i(title, "idToken $idToken")

                            requireActivity().gdToast("Authentication successful", Gravity.BOTTOM)
                            val action = SignupChoicesFragmentDirections.actionSignupChoicesFragmentToEmailSignupFragment()
                            action.newUser = newUser
                            goto(action)
                        } else {
                            requireActivity().gdToast(
                                "Authentication Unsuccessful",
                                Gravity.BOTTOM
                            )
                            Log.i(title, "Task not successful")
                        }

                    }
                } else {
                    Log.i(title, "OKCODE ${Activity.RESULT_OK} RESULTCODE ${result.resultCode}")
                }
            }).launch(intent)

        }

    }

Answer 1

从文档中引用

在创建片段或活动之前调用 registerForActivityResult() 是安全的，允许在为返回的 ActivityResultLauncher 实例声明成员变量时直接使用它。 注意：虽然在创建片段或活动之前调用 registerForActivityResult() 是安全的，但在片段或活动的生命周期达到 CREATED 之前，您无法启动 ActivityResultLauncher。

因此解决您的问题，您的移动电话登记外onCreate()，并把它fragment的范围，并在google_sign_in_buttonclick-listener呼叫发射功能

注意：如果您使用的是Kotlin-Android-Extention，请将您的click-listener电话转至onViewCreated()

Answer 2

您必须val launcher = registerForActivityResult...从 中删除setOnClickListener，然后将其保存在变量中，在您的示例中是 is launcher，并在setOnClickListener使用 .launch 执行变量中，在您的示例中 es launcher。

你的代码看起来像这样

google_sign_in_button.setOnClickListener {
        val intent = mGoogleSignInClient.signInIntent

        launcher.launch(intent)
}


private val launcher = registerForActivityResult(ActivityResultContracts.StartActivityForResult(), ActivityResultCallback {result->
                if (result.resultCode == Activity.RESULT_OK) {
                    val task = GoogleSignIn.getSignedInAccountFromIntent(result.data)
                    task.addOnCompleteListener {
                        if (it.isSuccessful) {
                            val account: GoogleSignInAccount? =
                                it.getResult(ApiException::class.java)
                            val idToken = it.result?.idToken
                            val email = account?.email
                            val lastName = account?.familyName
                            val firstName = account?.givenName
                            val otherName = account?.displayName
                            val imageUrl = account?.photoUrl
                            val category = arg.category
                            val newUser = User()
                            newUser.firstName = firstName
                            newUser.lastName = lastName
                            newUser.otherName = otherName
                            newUser.category = category
                            newUser.email = email
                            newUser.imageUrl = imageUrl.toString()
                            userViewModel.currentUser = newUser
                            newUser.token = idToken

                            i(title, "idToken $idToken")

                            requireActivity().gdToast("Authentication successful", Gravity.BOTTOM)
                            val action = SignupChoicesFragmentDirections.actionSignupChoicesFragmentToEmailSignupFragment()
                            action.newUser = newUser
                            goto(action)
                        } else {
                            requireActivity().gdToast(
                                "Authentication Unsuccessful",
                                Gravity.BOTTOM
                            )
                            Log.i(title, "Task not successful")
                        }

                    }
                } else {
                    Log.i(title, "OKCODE ${Activity.RESULT_OK} RESULTCODE ${result.resultCode}")
                }
            })

来源：https ://medium.com/codex/android-runtime-permissions-using-registerforactivityresult-68c4eb3c0b61

Answer 3

如果您使用的是 Fragment，请确保您没有registerForActivityResult在活动上执行。Fragments 也有一个registerForActivityResult，这就是你应该使用的。

Answer 4

我找到了一个可以在任何地方使用的解决方案。

查看ActivityResultRegistry源代码，您可以看到有两个register函数，并且只有一个抛出if lifecycle.getCurrentState().isAtLeast(Lifecycle.State.STARTED)。另一个不关心生命周期，但你必须调用unregister自己。

调用此方法时，当不再需要启动器释放可能在注册回调中捕获的任何值时，您必须对返回的 ActivityResultLauncher 调用 ActivityResultLauncher.unregister() 。

这是我想出的扩展函数：

fun <I, O> ComponentActivity.registerActivityResultLauncher(
    contract: ActivityResultContract<I, O>,
    callback: ActivityResultCallback<O>
): ActivityResultLauncher<I> {
    val key = UUID.randomUUID().toString()
    return activityResultRegistry.register(key, contract, callback)
}

像这样使用它：

val launcher = activity.registerActivityResultLauncher(
    contract = ActivityResultContracts.StartActivityForResult(),
    callback = { result ->
        //do something with the result
    }
)

完成后不要忘记取消注册：

launcher.unregister()

详细信息：在单独的班级中接收活动结果

Answer 5

在创建片段或活动之前可以安全地调用 registerForActivityResult() ，从而允许在为返回的 ActivityResultLauncher 实例声明成员变量时直接使用它。

您应该在创建视图之前调用registerForActivityResult。成员变量或 onCreate()

Answer 6

对我来说，问题是我正在调用registerForActivityResult一个onClickListener，它只在单击按钮时调用（此时应用程序处于 RESUMED 状态）。将调用移到按钮之外onClickListener并进入 Activity 的onCreate方法修复了它。