使用设备凭据时Android生物识别技术无法导航

Question

我正在使用生物识别库锁定应用程序。一切正常，当我用指纹解锁时，会调用AuthenticationSucceeded（）get，设备会从锁屏中导航。然而，如果使用模式解锁，则会调用onAuthenticationSucceeded（）get，但导航没有初始化，我被留在锁屏片段上。

编辑：这只影响具有任何设备凭据的API29

编辑2：我也得到了

FragmentNavigator：忽略popBackStack（）调用：FragmentManager已经保存了它的状态

FragmentNavigator：忽略navigate（）调用：FragmentManager已保存其状态

private lateinit var biometricPrompt: BiometricPrompt

override fun onCreateView(
    inflater: LayoutInflater,
    container: ViewGroup?,
    savedInstanceState: Bundle?
): View? {
    biometricPrompt = createBiometricPrompt()
    return inflater.inflate(R.layout.lock_screen_fragment, container, false)
}

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

    val isAppLockEnabled: Boolean = PreferenceManager.getDefaultSharedPreferences(context)
        .getBoolean("lock_app_preference", false)

    // If app locks is not set go to home fragment else display app lock screen
    if (!isAppLockEnabled) {
        findNavController().navigate(R.id.action_lock_screen_fragment_dest_to_home_fragment_dest)
    } else {

   

        // Prompt appears when user clicks "Unlock".
        unlock_button.setOnClickListener {
            val promptInfo = createPromptInfo()
            biometricPrompt.authenticate(promptInfo)
        }
   }

}

private fun createBiometricPrompt(): BiometricPrompt {
    val executor = ContextCompat.getMainExecutor(context)

    val callback = object : BiometricPrompt.AuthenticationCallback() {
        override fun onAuthenticationError(errorCode: Int, errString: CharSequence) {
            super.onAuthenticationError(errorCode, errString)
            Log.d("AuthenticationError()", "$errorCode :: $errString")
        }

        override fun onAuthenticationFailed() {
            super.onAuthenticationFailed()
            Log.d("AuthenticationFailed()", "Authentication failed for an unknown reason")
        }

        override fun onAuthenticationSucceeded(result: BiometricPrompt.AuthenticationResult) {
            super.onAuthenticationSucceeded(result)
            lock_icon.setImageResource(R.drawable.ic_unlock)
            lock_screen_text_view.text = getString(R.string.app_unlocked)
        //This doesn't work when using pattern unlock   findNavController().navigate(R.id.action_lock_screen_fragment_dest_to_home_fragment_dest)
        }
    }

    return BiometricPrompt(this, executor, callback)
}

private fun createPromptInfo(): BiometricPrompt.PromptInfo {
    return BiometricPrompt.PromptInfo.Builder()
        .setTitle("Unlock App")
        .setConfirmationRequired(false)
        .setDeviceCredentialAllowed(true)
        .build()
}

}

Answer 1

好的，所以我解决了这个问题。将导航从onAuthenticationResume（）移动到片段onResume（）。设备凭据窗口暂停我的应用程序，之后不知何故无法调用导航。

解决方案代码：

private var isAppUnlocked : Boolean = false    


override fun onAuthenticationSucceeded(result: BiometricPrompt.AuthenticationResult) {
            super.onAuthenticationSucceeded(result)
            isAppUnlocked = true
            unlockApp()
            Log.d("AuthenticationSuccess", "Authentication succeeded")
        }    

override fun onResume() {
    super.onResume()
    if(isAppUnlocked){
        unlockApp()
    }
}    

private fun unlockApp(){
    lock_icon.setImageResource(R.drawable.ic_unlock)
    lock_screen_text_view.text = getString(R.string.app_unlocked)
    findNavController().navigate(R.id.action_lock_screen_fragment_dest_to_home_fragment_dest)
}