我在我的android项目中使用了firebase。 但是,当用户尝试使用我的应用程序注册Firebase时,会出现这种情况。登录到kotlin的firebase android studio
我的错误日志
09-15 13:54:23.992 2716-2716/com.example.err0r1096.tikteck E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.err0r1096.tikteck, PID: 2716
java.lang.IllegalStateException: Could not execute method for android:onClick
at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:293)
at android.view.View.performClick(View.java:5637)
at android.view.View$PerformClick.run(View.java:22429)
at android.os.Handler.handleCallback(Handler.java:751)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6119)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:886)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:776)
Caused by: java.lang.reflect.InvocationTargetException
at java.lang.reflect.Method.invoke(Native Method)
at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:288)
at android.view.View.performClick(View.java:5637)
at android.view.View$PerformClick.run(View.java:22429)
at android.os.Handler.handleCallback(Handler.java:751)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6119)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:886)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:776)
Caused by: kotlin.KotlinNullPointerException
at com.example.err0r1096.tikteck.Login.LoginToFireBase(Login.kt:26)
at com.example.err0r1096.tikteck.Login.OneC(Login.kt:20)
at java.lang.reflect.Method.invoke(Native Method)
at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:288)
at android.view.View.performClick(View.java:5637)
at android.view.View$PerformClick.run(View.java:22429)
at android.os.Handler.handleCallback(Handler.java:751)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6119)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:886)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:776)
,这我的代码:
package com.example.err0r1096.tikteck
import android.support.v7.app.AppCompatActivity
import android.os.Bundle
import android.view.View
import android.widget.Toast
import com.google.firebase.auth.FirebaseAuth
import kotlinx.android.synthetic.main.activity_login.*
class Login : AppCompatActivity() {
private val mAuth: FirebaseAuth? = null
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_login)
}
fun OneC(view: View){
LoginToFireBase(etEmail.text.toString(),etPassword.text.toString())
}
fun LoginToFireBase(email:String,password:String){
mAuth!!.createUserWithEmailAndPassword(email,password)
.addOnCompleteListener(this){ task ->
if (task.isSuccessful){
Toast.makeText(applicationContext,"Successful login",Toast.LENGTH_LONG).show()
}
else
{
Toast.makeText(this,"Login UnSuccessful",Toast.LENGTH_LONG).show()
}
}
}
}
我的应用程序崩溃的启动按钮时,用户点击。
我认为问题出在我的代码中,而不是在firebase上。
你的代码在'LoginToFireBase(登录扔'NullPointerException'。 KT:26)'。你有没有在任何地方初始化'mAuth'?如果没有,['mAuth !!'会抛出'NullPointerException'](https://stackoverflow.com/questions/34342413/what-is-the-kotlin-double-bang)。 –
“mAuth !!” - 尽量不要使用它,如果你不是100%肯定它不是null。尽可能避免可空对象。这将导致更清洁和无崩溃的代码。 –