使用 SmsRetriever 时接收广播 Intent 时出错

Question

使用 Firebase Auth 进行身份验证时，我想自动输入通过 SMS 接收的代码。我能够接收短信并手动完成身份验证过程，但是当我使用 SmsRetriever 时，应用程序崩溃，然后显示底部工作表对话框。这就是出现在 Logcat 中的所有内容：

java.lang.RuntimeException: Error receiving broadcast Intent { act=com.google.android.gms.auth.api.phone.SMS_RETRIEVED flg=0x200010 pkg=com.finca.bank (has extras) } in com.google.android.gms.internal.firebase-auth-api.zzvb@45fb8c5
        at android.app.LoadedApk$ReceiverDispatcher$Args.lambda$getRunnable$0$LoadedApk$ReceiverDispatcher$Args(LoadedApk.java:1566)
        at android.app.-$$Lambda$LoadedApk$ReceiverDispatcher$Args$_BumDX2UKsnxLVrE6UJsJZkotuA.run(Unknown Source:2)
        at android.os.Handler.handleCallback(Handler.java:883)
        at android.os.Handler.dispatchMessage(Handler.java:100)
        at android.os.Looper.loop(Looper.java:224)
        at android.app.ActivityThread.main(ActivityThread.java:7562)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:539)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:950)
     Caused by: java.lang.NullPointerException: Attempt to invoke interface method 'int java.lang.CharSequence.length()' on a null object reference
        at java.util.regex.Matcher.reset(Matcher.java:280)
        at java.util.regex.Matcher.<init>(Matcher.java:186)
        at java.util.regex.Pattern.matcher(Pattern.java:1034)
        at com.google.android.gms.internal.firebase-auth-api.zzvd.zzf(com.google.firebase:firebase-auth@@20.0.1:1)
        at com.google.android.gms.internal.firebase-auth-api.zzvb.onReceive(com.google.firebase:firebase-auth@@20.0.1:8)
        at android.app.LoadedApk$ReceiverDispatcher$Args.lambda$getRunnable$0$LoadedApk$ReceiverDispatcher$Args(LoadedApk.java:1556)
        at android.app.-$$Lambda$LoadedApk$ReceiverDispatcher$Args$_BumDX2UKsnxLVrE6UJsJZkotuA.run(Unknown Source:2) 

这是我的 Fragment 中接收 SMS 的代码：

private val SMS_CONSENT_REQUEST = 2  // Set to an unused request code

    private val smsVerificationReceiver = object : BroadcastReceiver() {
        override fun onReceive(context: Context, intent: Intent) {
            try {
                if (SmsRetriever.SMS_RETRIEVED_ACTION == intent.action) {
                    val extras = intent.extras
                    val smsRetrieverStatus = extras?.get(SmsRetriever.EXTRA_STATUS) as Status

                    when (smsRetrieverStatus.statusCode) {
                        CommonStatusCodes.SUCCESS -> {
                            // Get consent intent
                            val consentIntent = extras.getParcelable<Intent>(SmsRetriever.EXTRA_CONSENT_INTENT)
                            try {
                                // Start activity to show consent dialog to user, activity must be started in
                                // 5 minutes, otherwise you'll receive another TIMEOUT intent
                                startActivityForResult(consentIntent, SMS_CONSENT_REQUEST)
                            } catch (e: ActivityNotFoundException) {
                                // Handle the exception ...
                            }
                        }
                        CommonStatusCodes.TIMEOUT -> {
                            // Time out occurred, handle the error.
                        }
                    }
                }
            } catch (e: Exception) {
                Timber.e(e, "onReceive: ")
            }
        }
    }

    override fun onResume() {
        super.onResume()
        val task = SmsRetriever.getClient(requireActivity()).startSmsUserConsent(null)
        val intentFilter = IntentFilter(SmsRetriever.SMS_RETRIEVED_ACTION)
        requireActivity().registerReceiver(smsVerificationReceiver, intentFilter)
    }

    override fun onPause() {
        super.onPause()
        requireActivity().unregisterReceiver(smsVerificationReceiver)
    }

    override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
        super.onActivityResult(requestCode, resultCode, data)
        when (requestCode) {
            // ...
            SMS_CONSENT_REQUEST ->
                // Obtain the phone number from the result
                if (resultCode == Activity.RESULT_OK && data != null) {
                    // Get SMS message content
                    val message = data.getStringExtra(SmsRetriever.EXTRA_SMS_MESSAGE)
                    // Extract one-time code from the message and complete verification
                    // `message` contains the entire text of the SMS message, so you will need
                    // to parse the string.
                    message?.let { presenter.parseSms(it) }
                    // send one time code to the server
                } else {
                    // Consent denied. User can type OTC manually.
                }
        }
    }

有趣的是，在极少数情况下进展顺利，我不知道这取决于什么。此外，如果在onReceive 中设置断点，则在调试模式下一切顺利

Answer 1

经过多次调查，这次崩溃的根本原因似乎与 Firebase Auth Instant Verification 功能和 SMS consent API 之间的冲突有关。

要修复它，您有两种选择：

1. 删除 SMS 同意 API 并仅依赖即时验证
   
2. 使用 SMS Consent API 并通过将超时设置为 0 来禁用即时验证。https://firebase.google.com/docs/reference/android/com/google/firebase/auth/PhoneAuthOptions.Builder#setTimeout(java.lang.Long,%20java.util.concurrent.TimeUnit))

希望这可以为这个奇怪的问题提供一些清晰的信息。

Answer 2

要自动验证电话号码，您必须同时实现验证流程的客户端和服务器部分。您刚刚实现了客户端部分。要收听 SMS 并自动输入 OTP 代码，您还必须实现服务器端。在这里可以找到完整的指南Perform SMS Verification on a Server