当我运行应用程序时，请保持此“在com.google.firebase.auth.FirebaseAuth.createUserWithEmailAndPassword时给出的字符串为空或为空”错误

Question

运行我的应用程序时，我不断收到此错误：

E/AndroidRuntime: FATAL EXCEPTION: main
    Process: com.example.miapp, PID: 29009
    java.lang.IllegalArgumentException: Given String is empty or null
        at com.google.android.gms.common.internal.Preconditions.checkNotEmpty(Unknown Source:5)
        at com.google.firebase.auth.FirebaseAuth.createUserWithEmailAndPassword(com.google.firebase:firebase-auth@@19.2.0:255)
        at com.example.loginapp.RegisterFragment.onCreateView(RegisterFragment.java:63)
        at androidx.fragment.app.Fragment.performCreateView(Fragment.java:2439)
        at androidx.fragment.app.FragmentManagerImpl.moveToState(FragmentManager.java:1460)
        at androidx.fragment.app.FragmentManagerImpl.moveFragmentToExpectedState(FragmentManager.java:1784)
        at androidx.fragment.app.FragmentManagerImpl.moveToState(FragmentManager.java:1852)
        at androidx.fragment.app.BackStackRecord.executeOps(BackStackRecord.java:802)
        at androidx.fragment.app.FragmentManagerImpl.executeOps(FragmentManager.java:2625)
        at androidx.fragment.app.FragmentManagerImpl.executeOpsTogether(FragmentManager.java:2411)
        at androidx.fragment.app.FragmentManagerImpl.removeRedundantOperationsAndExecute(FragmentManager.java:2366)
        at androidx.fragment.app.FragmentManagerImpl.execSingleAction(FragmentManager.java:2243)
        at androidx.fragment.app.BackStackRecord.commitNowAllowingStateLoss(BackStackRecord.java:654)
        at androidx.fragment.app.FragmentPagerAdapter.finishUpdate(FragmentPagerAdapter.java:146)
        at androidx.viewpager.widget.ViewPager.populate(ViewPager.java:1244)
        at androidx.viewpager.widget.ViewPager.populate(ViewPager.java:1092)
        at androidx.viewpager.widget.ViewPager.onMeasure(ViewPager.java:1622)
        at android.view.View.measure(View.java:24966)
        at android.widget.RelativeLayout.measureChildHorizontal(RelativeLayout.java:715)
        at android.widget.RelativeLayout.onMeasure(RelativeLayout.java:461)
        at android.view.View.measure(View.java:24966)
        at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:7139)
        at android.widget.FrameLayout.onMeasure(FrameLayout.java:185)
        at androidx.appcompat.widget.ContentFrameLayout.onMeasure(ContentFrameLayout.java:143)
        at android.view.View.measure(View.java:24966)
        at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:7139)
        at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1535)
        at android.widget.LinearLayout.measureVertical(LinearLayout.java:825)
        at android.widget.LinearLayout.onMeasure(LinearLayout.java:704)
        at android.view.View.measure(View.java:24966)
        at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:7139)
        at android.widget.FrameLayout.onMeasure(FrameLayout.java:185)
        at android.view.View.measure(View.java:24966)
        at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:7139)
        at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1535)
        at android.widget.LinearLayout.measureVertical(LinearLayout.java:825)
        at android.widget.LinearLayout.onMeasure(LinearLayout.java:704)
        at android.view.View.measure(View.java:24966)
        at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:7139)
        at android.widget.FrameLayout.onMeasure(FrameLayout.java:185)
        at com.android.internal.policy.DecorView.onMeasure(DecorView.java:992)
        at android.view.View.measure(View.java:24966)
        at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:3301)
        at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:2028)
        at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:2330)
        at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1888)
        at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:8511)
        at android.view.Choreographer$CallbackRecord.run(Choreographer.java:949)
        at android.view.Choreographer.doCallbacks(Choreographer.java:761)
        at android.view.Choreographer.doFrame(Choreographer.java:696)
        at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:935)
        at android.os.Handler.handleCallback(Handler.java:873)
        at android.os.Handler.dispatchMessage(Handler.java:99)
E/AndroidRuntime:     at android.os.Looper.loop(Looper.java:214)
        at android.app.ActivityThread.main(ActivityThread.java:7050)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:965)

这是我的MainActivity：

package com.example.loginapp;

import androidx.fragment.app.Fragment;
import androidx.fragment.app.FragmentManager;
import androidx.fragment.app.FragmentPagerAdapter;
import androidx.viewpager.widget.ViewPager;
import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;

import com.google.android.gms.tasks.OnCompleteListener;
import com.google.android.gms.tasks.Task;
import com.google.firebase.auth.AuthResult;
import com.google.firebase.auth.FirebaseAuth;

import java.util.ArrayList;

import androidx.annotation.NonNull;

public class MainActivity extends AppCompatActivity {


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);





        ViewPager viewPager = findViewById(R.id.viewPager);

        AuthenticationPagerAdapter pagerAdapter = new AuthenticationPagerAdapter(getSupportFragmentManager());
        pagerAdapter.addFragmet(new LoginFragment());
        pagerAdapter.addFragmet(new RegisterFragment());
        viewPager.setAdapter(pagerAdapter);
    }

    class AuthenticationPagerAdapter extends FragmentPagerAdapter {
        private ArrayList<Fragment> fragmentList = new ArrayList<>();

        public AuthenticationPagerAdapter(FragmentManager fm) {
            super(fm);
        }

        @Override
        public Fragment getItem(int i) {
            return fragmentList.get(i);
        }

        @Override
        public int getCount() {
            return fragmentList.size();
        }

        void addFragmet(Fragment fragment) {
            fragmentList.add(fragment);
        }
    }


}

这是RegisterFragment：

package com.example.loginapp;


import android.os.Bundle;

import androidx.annotation.NonNull;
import androidx.fragment.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;

import com.google.android.gms.tasks.OnCompleteListener;
import com.google.android.gms.tasks.Task;
import com.google.firebase.auth.AuthResult;
import com.google.firebase.auth.FirebaseAuth;


/**
 * A simple {@link Fragment} subclass.
 */
public class RegisterFragment extends Fragment  {

    private EditText etName, etEmail, etPassword, etRePassword;
    private TextView tvLogo, tvSubtitle;
    private Button btnRegister;
    String userEmail, userPassword;
    private FirebaseAuth firebaseAuth;


    public RegisterFragment() {
        // Required empty public constructor
    }


    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        // Inflate the layout for this fragment
       View v = inflater.inflate(R.layout.fragment_register, container, false);

        etName =  v.findViewById(R.id.et_name);
        etEmail = v.findViewById(R.id.et_email);
        etPassword = v.findViewById(R.id.et_password);
        etRePassword = v.findViewById(R.id.et_repassword);
        tvLogo = v.findViewById(R.id.tv_logo);
        tvSubtitle = v.findViewById(R.id.tv_subtitle);
        btnRegister = v.findViewById(R.id.btn_register);
        firebaseAuth = FirebaseAuth.getInstance();

        btnRegister.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                userEmail = etEmail.getText().toString().trim();
                userPassword = etPassword.getText().toString().trim();
            }
        });


        firebaseAuth.createUserWithEmailAndPassword(userEmail,userPassword).addOnCompleteListener(new OnCompleteListener<AuthResult>() {
            @Override
            public void onComplete(@NonNull Task<AuthResult> task) {
                if(task.isSuccessful()){
                    Toast.makeText(RegisterFragment.this.getActivity(), "Usuario registrado con éxito", Toast.LENGTH_LONG).show();
                }else{
                    Toast.makeText(RegisterFragment.this.getActivity(), "Algo ha fallado en tu registro", Toast.LENGTH_LONG).show();

                }
            }
        });



        return v;
    }

}

我不知道是否有必要，但这是我的建造等级：

apply plugin: 'com.android.application'

android {
    compileSdkVersion 28
    defaultConfig {
        applicationId "com.example.miapp"
        minSdkVersion 28
        targetSdkVersion 28
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
}

dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    implementation 'androidx.appcompat:appcompat:1.0.0'
    implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
    implementation 'androidx.core:core:1.0.0'
    implementation "com.google.firebase:firebase-analytics:16.0.4"
    implementation 'com.google.firebase:firebase-core:16.0.4'
    implementation 'com.google.firebase:firebase-auth:19.2.0'
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'androidx.test.ext:junit:1.1.1'
    androidTestImplementation 'androidx.test.espresso:espresso-core:3.1.0'
}

apply plugin: 'com.google.gms.google-services'

我已经检查了api_key，但我不认为这是问题所在，请帮忙，我已经尝试修复了几个小时了！！！！！！