问Kotlin/Android Studio -当电子邮件地址格式错误时，应用程序在注册时崩溃

EN

override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    setContentView(R.layout.activity_main)

    register_button_register.setOnClickListener {
        performRegister()
    }

    already_have_account_text_view.setOnClickListener {
        Log.d("MainActivity", "Try to show login activity")

        val intent = Intent(this, LoginActivity::class.java)
        startActivity(intent)
    }

}

private fun performRegister() {
    val email = email_edittext_register.text.toString()
    val password = password_edittext_register.text.toString()

    if (email.isEmpty() || password.isEmpty()) {
        Toast.makeText(this, "Please enter your email and password", Toast.LENGTH_SHORT).show()
        return
    }

    Log.d("MainActivity", "Email is: " + email)
    Log.d("MainActivity", "Password: $password")

    FirebaseAuth.getInstance().createUserWithEmailAndPassword(email, password)
        .addOnCompleteListener {
            if (it.isSuccessful) return@addOnCompleteListener

            Log.d("Main", "Successfully created user with uid: ${it.result.user.uid}")
        }
        .addOnFailureListener{
            Log.d("Main", "Failed to create user: ${it.message}")
            Toast.makeText(this, "Please enter a valid email and password", Toast.LENGTH_SHORT).show()
        }

}

2019-03-12 22:04:48.112 29082-29082/com.example.messenger E/AndroidRuntime: FATAL EXCEPTION: main
    Process: com.example.messenger, PID: 29082
    com.google.android.gms.tasks.RuntimeExecutionException: com.google.firebase.auth.FirebaseAuthInvalidCredentialsException: The email address is badly formatted.
        at com.google.android.gms.tasks.zzu.getResult(Unknown Source:21)
        at com.example.messenger.MainActivity$performRegister$1.onComplete(MainActivity.kt:51)
        at com.google.android.gms.tasks.zzj.run(Unknown Source:23)
        at android.os.Handler.handleCallback(Handler.java:873)
        at android.os.Handler.dispatchMessage(Handler.java:99)
        at android.os.Looper.loop(Looper.java:193)
        at android.app.ActivityThread.main(ActivityThread.java:6669)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858)
     Caused by: com.google.firebase.auth.FirebaseAuthInvalidCredentialsException: The email address is badly formatted.
        at com.google.firebase.auth.api.internal.zzce.zzb(Unknown Source:223)
        at com.google.firebase.auth.api.internal.zzbb.zza(Unknown Source:42)
        at com.google.firebase.auth.api.internal.zzcy.zzc(Unknown Source:11)
        at com.google.firebase.auth.api.internal.zzdb.onFailure(Unknown Source:35)
        at com.google.firebase.auth.api.internal.zzci.dispatchTransaction(Unknown Source:83)
        at com.google.android.gms.internal.firebase_auth.zzb.onTransact(Unknown Source:22)
        at android.os.Binder.execTransact(Binder.java:731)

2019-03-12 22:04:48.114 1882-2869/? W/ActivityManager:   Force finishing activity com.example.messenger/.MainActivity

2019-03-12 22:04:48.149 1882-1955/? W/InputDispatcher: channel '37860b6 com.example.messenger/com.example.messenger.MainActivity (server)' ~ Consumer closed input channel or an error occurred.  events=0x9

2019-03-12 22:04:48.149 1882-1955/? E/InputDispatcher: channel '37860b6 com.example.messenger/com.example.messenger.MainActivity (server)' ~ Channel is unrecoverably broken and will be disposed!

2019-03-12 22:04:48.154 1882-4213/? I/WindowManager: WIN DEATH: Window{37860b6 u0 com.example.messenger/com.example.messenger.MainActivity}

2019-03-12 22:04:48.154 1882-4213/? W/InputDispatcher: Attempted to unregister already unregistered input channel '37860b6 com.example.messenger/com.example.messenger.MainActivity (server)'

2019-03-12 22:04:48.160 1723-1747/? W/SurfaceFlinger: Attempting to set client state on removed layer: com.example.messenger/com.example.messenger.MainActivity#0

2019-03-12 22:04:48.160 1723-1747/? W/SurfaceFlinger: Attempting to destroy on removed layer: com.example.messenger/com.example.messenger.MainActivity#0

2019-03-12 22:04:48.164 1723-1776/? W/SurfaceFlinger: Attempting to destroy on removed layer: AppWindowToken{4e2ac9 token=Token{5d60ad0 ActivityRecord{626da93 u0 com.example.messenger/.MainActivity t37}}}#0

2019-03-12 22:04:49.332 27898-27898/? I/Choreographer: Skipped 34 frames!  The application may be doing too much work on its main thread.

2019-03-12 22:04:49.426 1882-1936/? I/Choreographer: Skipped 39 frames!  The application may be doing too much work on its main thread.

2019-03-12 22:04:49.426 2609-2609/? I/Choreographer: Skipped 41 frames!  The application may be doing too much work on its main thread.

2019-03-12 22:04:49.439 2021-2021/? I/Choreographer: Skipped 55 frames!  The application may be doing too much work on its main thread.