java.lang.IllegalStateException：默认 FirebaseApp 未初始化

Question

您好，我在启动应用程序时不断收到此异常：

2019-02-18 16:33:14.735 2080-2080/? E/AndroidRuntime: 致命异常: main 进程：assus.oumayma.com.firebasekotlinapp，PID：2080 java.lang.RuntimeException：无法启动活动 ComponentInfo{assus.oumayma.com.firebasekotlinapp/assus.oumayma.com.firebasekotlinapp.MainActivity}：java.lang.IllegalStateException：默认 FirebaseApp 在此过程中未初始化 assus.oumayma.com .firebasekotlinapp。确保首先调用 FirebaseApp.initializeApp(Context)。 在 android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2725) 在 android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2786) 在 android.app.ActivityThread.-wrap12(ActivityThread.java) 在 android.app.ActivityThread$H.handleMessage(ActivityThread.java:1501) 在 android.os.Handler.dispatchMessage(Handler.java:102) 在 android.os.Looper.loop(Looper.java:173) 在 android.app.ActivityThread.main(ActivityThread.java:6459) 在 java.lang.reflect.Method.invoke（本机方法） 在 com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:938) 在 com.android.internal.os.ZygoteInit.main(ZygoteInit.java:828) 原因：java.lang.IllegalStateException：默认 FirebaseApp 未在此过程中初始化 assus.oumayma.com.firebasekotlinapp。确保首先调用 FirebaseApp.initializeApp(Context)。 在 com.google.firebase.FirebaseApp.getInstance(com.google.firebase:firebase-common@@16.0.2:240) 在 com.google.firebase.auth.FirebaseAuth.getInstance（未知来源） 在 assus.oumayma.com.firebasekotlinapp.MainActivity.onCreate(MainActivity.kt:23) 在 android.app.Activity.performCreate(Activity.java:6673) 在 android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1136)

这是代码：

class MainActivity : AppCompatActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
    
        mAuth = FirebaseAuth.getInstance()
        signOut.setOnClickListener {
            view: View? -> mAuth.signOut()
            startActivity(Intent(this, PhoneAuthenfication::class.java))
            Toast.makeText(this, "Logged out Successfully :)", Toast.LENGTH_LONG)
                .show()
        }
    }
    
    
    override fun onStart() {
        super.onStart()
        if (mAuth.currentUser == null) {
            startActivity(Intent(this, PhoneAuthenfication::class.java))
        } else {
            Toast.makeText(this, "Already Signed in :)", Toast.LENGTH_LONG).show()
        } 
    }
    
}

class PhoneAuthenfication : AppCompatActivity() {

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

        mAuth = FirebaseAuth.getInstance()
        veriBtn.setOnClickListener { view: View? ->
            progress.visibility = View.VISIBLE
            verify()
        }
        authBtn.setOnClickListener { view: View? ->
            progress.visibility = View.VISIBLE
            authenticate()
        }
    }


    private fun verificationCallbacks() {
        mCallbacks = object : PhoneAuthProvider.OnVerificationStateChangedCallbacks() {
            override fun onVerificationCompleted(credential: PhoneAuthCredential) {
                progress.visibility = View.INVISIBLE
                signIn(credential)
            }

            override fun onVerificationFailed(p0: FirebaseException?) {
                TODO("not implemented") //To change body of created functions use File | Settings | File Templates.
            }

            override fun onCodeSent(verfication: String?, p1: PhoneAuthProvider.ForceResendingToken?) {
                super.onCodeSent(verfication, p1)
                verificationId = verfication.toString()
                progress.visibility = View.INVISIBLE
            }

        }
    }

    private fun verify() {

        verificationCallbacks()

        val phnNo = phnNoTxt.text.toString()

        PhoneAuthProvider.getInstance().verifyPhoneNumber(
            phnNo,
            60,
            TimeUnit.SECONDS,
            this,
            mCallbacks
        )
    }

    private fun signIn(credential: PhoneAuthCredential) {
        mAuth.signInWithCredential(credential)
            .addOnCompleteListener { task: Task<AuthResult> ->
                if (task.isSuccessful) {
                    toast("Logged in Successfully :)")
                    startActivity(Intent(this, MainActivity::class.java))
                }
            }
    }

    private fun authenticate() {

        val verifiNo = verifiTxt.text.toString()

        val credential: PhoneAuthCredential = PhoneAuthProvider.getCredential(verificationId, verifiNo)

        signIn(credential)

    }

    private fun toast(msg: String) {
        Toast.makeText(this, msg, Toast.LENGTH_LONG).show()
    }

build.gradle：

implementation 'com.google.firebase:firebase-auth:16.1.0'
implementation 'com.google.firebase:firebase-core:16.0.7'

Answer 1

您正在尝试获取 Firebase 实例而不对其进行初始化。请在尝试获取 Firebase 实例之前添加这行代码：

FirebaseApp.initializeApp(this);

如果您使用的是谷歌服务4.1.0

classpath 'com.google.gms:google-services:4.1.0'

然后更新版本到

classpath 'com.google.gms:google-services:4.2.0'