在我的应用程序中集成防火墙身份验证后，应用程序崩溃

Question

我的应用程序在添加了firebase身份验证后，在启动它时崩溃(基本上是使用firebase代码的任何活动)。

这是逻辑猫

2022-07-14 20:17:21.538 15482-15482/com.example.flimer E/AndroidRuntime: FATAL EXCEPTION: main
    Process: com.example.flimer, PID: 15482
    java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.example.flimer/com.example.flimer.SignUp}: java.lang.NullPointerException: Attempt to invoke virtual method 'android.content.pm.ApplicationInfo android.content.Context.getApplicationInfo()' on a null object reference
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3086)
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3318)
        at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:78)
        at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:113)
        at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:71)
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2044)
        at android.os.Handler.dispatchMessage(Handler.java:106)
        at android.os.Looper.loop(Looper.java:226)
        at android.app.ActivityThread.main(ActivityThread.java:7212)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:576)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:956)
     Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'android.content.pm.ApplicationInfo android.content.Context.getApplicationInfo()' on a null object reference
        at android.content.ContextWrapper.getApplicationInfo(ContextWrapper.java:170)
        at android.view.ContextThemeWrapper.getTheme(ContextThemeWrapper.java:157)
        at android.content.Context.obtainStyledAttributes(Context.java:682)
        at androidx.appcompat.app.AppCompatDelegateImpl.createSubDecor(AppCompatDelegateImpl.java:848)
        at androidx.appcompat.app.AppCompatDelegateImpl.ensureSubDecor(AppCompatDelegateImpl.java:815)
        at androidx.appcompat.app.AppCompatDelegateImpl.findViewById(AppCompatDelegateImpl.java:640)
        at androidx.appcompat.app.AppCompatActivity.findViewById(AppCompatActivity.java:259)
        at com.example.flimer.SignUp.<init>(SignUp.kt:15)
        at java.lang.Class.newInstance(Native Method)
        at android.app.AppComponentFactory.instantiateActivity(AppComponentFactory.java:69)
        at androidx.core.app.CoreComponentFactory.instantiateActivity(CoreComponentFactory.java:45)
        at android.app.Instrumentation.newActivity(Instrumentation.java:1215)
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3074)

这是启动屏幕的代码。

class Startscreen : AppCompatActivity() {
    private lateinit var auth: FirebaseAuth

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

        auth = Firebase.auth

        val user = auth.currentUser

        if (Build.VERSION.SDK_INT < 16) {
            window.setFlags(
                WindowManager.LayoutParams.FLAG_FULLSCREEN,
                WindowManager.LayoutParams.FLAG_FULLSCREEN)
        }

        if (user != null){
            Handler().postDelayed({
                    val intent = Intent(this@Startscreen, MainActivity::class.java)
                    startActivity(intent)
                    finish()
            }, 2000)
        }else{
            Handler().postDelayed({
                val intent = Intent(this@Startscreen, SignUp::class.java)
                startActivity(intent)
                finish()
            },2000)
        }
    }

这是我开始注册时屏幕上发生的崩溃。

class SignUp : AppCompatActivity() {
    private lateinit var etEmail: String
    private lateinit var etPass: String
    private lateinit var etPass2: String
    private lateinit var btn: Button

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_sign_up)
        etEmail = findViewById<EditText>(R.id.et_email).text.toString().trim { it <= ' ' }
        etPass = findViewById<EditText>(R.id.pass).text.toString().trim { it <= ' ' }
        etPass2 = findViewById<EditText>(R.id.et_pass2).text.toString().trim { it <= ' ' }
        btn = findViewById(R.id.btn_create)

        btn.setOnClickListener {
            dialog()
            if (isValid(etEmail, etPass, etPass2)){
                signUp(etEmail, etPass)
            }
        }

    }

    private fun isValid(email: String, pass: String,pass2: String ): Boolean{
        return if (email.isEmpty() && pass.isEmpty()){
            Toast.makeText(this@SignUp, "Fill in the blanks", Toast.LENGTH_SHORT).show()
            false
        }else if(pass != pass2){
            Toast.makeText(this@SignUp, "Passwords do not match", Toast.LENGTH_SHORT).show()
            false
        }else{
            true
        }
    }
    private fun signUp(email: String, pass: String){
        var auth: FirebaseAuth = Firebase.auth
        auth.createUserWithEmailAndPassword(email,pass).addOnCompleteListener {
            dismiss()
            if (it.isSuccessful){
                Toast.makeText(this@SignUp, "Success",Toast.LENGTH_SHORT ).show()
            }else{
                Toast.makeText(this@SignUp, it.exception!!.message, Toast.LENGTH_SHORT).show()
            }
        }
    }
    private fun dialog(){
        val dialog = Dialog(this)
        dialog.setContentView(R.layout.custom_dialog)
        dialog.show()
    }
    private fun dismiss(){
        Dialog(this).dismiss()
    }
}

Answer 1

初始化auth变量的步骤如下

auth = FirebaseAuth.getInstance()

而不是你在做什么

auth = Firebase.auth