问题

以下是我在Android Studio中注册页面和登录页面的代码。代码运行正常，但在注册用户详细信息时似乎无法上传到我的Firebase数据库。因此，在登录页面上无法使用此数据。不确定如何在我的代码中纠正这个问题。希望能得到帮助。

package com.example.spaceattack;

import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;

import android.content.Intent;
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;

public class RegisterActivity extends AppCompatActivity {
    EditText emailId, password;
    Button btnSignUp;
    TextView tvSignIn;
    FirebaseAuth mFirebaseAuth;

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

        mFirebaseAuth = FirebaseAuth.getInstance();
        emailId = findViewById(R.id.editText);
        password = findViewById(R.id.editText2);
        btnSignUp = findViewById(R.id.button2);
        tvSignIn = findViewById(R.id.textView);
        btnSignUp.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                String email = emailId.getText().toString();
                String pwd = password.getText().toString();
                if (email.isEmpty()) {
                    emailId.setError("Please enter email id");
                    emailId.requestFocus();
                } else if (pwd.isEmpty()) {
                    password.setError("Enter your password");
                    password.requestFocus();
                } else if (email.isEmpty() && pwd.isEmpty()) {
                    Toast.makeText(RegisterActivity.this, "Fields are Empty", Toast.LENGTH_SHORT).show();
                } else if (!(email.isEmpty() && pwd.isEmpty())) {
                    mFirebaseAuth.createUserWithEmailAndPassword(email, pwd).addOnCompleteListener(RegisterActivity.this, new OnCompleteListener<AuthResult>() {
                        @Override
                        public void onComplete(@NonNull Task<AuthResult> task) {
                            if (!task.isSuccessful()) {
                                Toast.makeText(RegisterActivity.this, "SignUp Unsuccessful, Try again", Toast.LENGTH_SHORT).show();
                            } else {
                                startActivity(new Intent(RegisterActivity.this, WaterActivity.class));
                            }
                        }
                    });
                } else {
                    Toast.makeText(RegisterActivity.this, "Error!", Toast.LENGTH_SHORT).show();
                }
            }
        });

        tvSignIn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent i = new Intent(RegisterActivity.this, LoginActivity.class);
                startActivity(i);
            }
        });
    }
}

package com.example.spaceattack;

import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;

import android.content.Intent;
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 com.google.firebase.auth.FirebaseUser;

public class LoginActivity extends AppCompatActivity {
    EditText emailId, password;
    Button btnSignUp;
    TextView tvSignUp;
    FirebaseAuth mFirebaseAuth;
    private FirebaseAuth.AuthStateListener mAuthStateListener;

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

        mFirebaseAuth = FirebaseAuth.getInstance();
        emailId = findViewById(R.id.editText);
        password = findViewById(R.id.editText2);
        btnSignUp = findViewById(R.id.button2);
        tvSignUp = findViewById(R.id.textView2);

        mAuthStateListener = new FirebaseAuth.AuthStateListener() {
            @Override
            public void onAuthStateChanged(@NonNull FirebaseAuth firebaseAuth) {
                FirebaseUser mFirebaseUser = mFirebaseAuth.getCurrentUser();
                if (mFirebaseUser != null) {
                    Toast.makeText(LoginActivity.this, "Logged in", Toast.LENGTH_SHORT).show();
                    Intent i = new Intent(LoginActivity.this, MainActivity.class);
                    startActivity(i);
                } else {
                    Toast.makeText(LoginActivity.this, "Please Login", Toast.LENGTH_SHORT).show();
                }
            }
        };

        btnSignUp.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                String email = emailId.getText().toString();
                String pwd = password.getText().toString();
                if (email.isEmpty()) {
                    emailId.setError("Please enter email id");
                    emailId.requestFocus();
                } else if (pwd.isEmpty()) {
                    password.setError("Enter your password");
                    password.requestFocus();
                } else if (email.isEmpty() && pwd.isEmpty()) {
                    Toast.makeText(LoginActivity.this, "Fields are Empty", Toast.LENGTH_SHORT).show();
                } else if (!(email.isEmpty() && pwd.isEmpty())) {
                    mFirebaseAuth.signInWithEmailAndPassword(email, pwd).addOnCompleteListener(LoginActivity.this, new OnCompleteListener<AuthResult>() {
                        @Override
                        public void onComplete(@NonNull Task<AuthResult> task) {
                            if (!task.isSuccessful()) {
                                Toast.makeText(LoginActivity.this, "Login Error, Please Login Again", Toast.LENGTH_SHORT).show();
                            } else {
                                Intent intToHome = new Intent(LoginActivity.this, WaterActivity.class);
                                startActivity(intToHome);
                            }
                        }
                    });
                } else {
                    Toast.makeText(LoginActivity.this, "Error!", Toast.LENGTH_SHORT).show();
                }
            }
        });

        tvSignUp.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intSignUp = new Intent(LoginActivity.this, WaterActivity.class);
                startActivity(intSignUp);
            }
        });
    }

    @Override
    protected void onStart() {
        super.onStart();
        mFirebaseAuth.addAuthStateListener(mAuthStateListener);
    }
}

英文:

Below is my code for both my registration page and sign in page in android studio. The code runs however when registering the user's details does not seem to upload onto my firebase database. Therefore unable to use this data when on my sign in page. Unsure on how to rectify this within my code. Any help would be appreciated.

package com.example.spaceattack;
import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import android.content.Intent;
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;
public class RegisterActivity extends AppCompatActivity {
EditText emailId, password;
Button btnSignUp;
TextView tvSignIn;
FirebaseAuth mFirebaseAuth;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_register);
mFirebaseAuth = FirebaseAuth.getInstance();
emailId = findViewById(R.id.editText);
password = findViewById(R.id.editText2);
btnSignUp = findViewById(R.id.button2);
tvSignIn = findViewById(R.id.textView);
btnSignUp.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
String email = emailId.getText().toString();
String pwd = password.getText().toString();
if(email.isEmpty()) {
emailId.setError(&quot;Please enter email id&quot;);
emailId.requestFocus();
}
else if(pwd.isEmpty()) {
password.setError(&quot;Enter your password&quot;);
password.requestFocus();
}
else if(email.isEmpty() &amp;&amp; pwd.isEmpty()) {
Toast.makeText(RegisterActivity.this,&quot;Fields are Empty&quot;,Toast.LENGTH_SHORT).show();
}
else if(! (email.isEmpty() &amp;&amp; pwd.isEmpty())) {
mFirebaseAuth.createUserWithEmailAndPassword(email, pwd) .addOnCompleteListener(RegisterActivity.this, new OnCompleteListener&lt;AuthResult&gt;() {
@Override
public void onComplete(@NonNull Task&lt;AuthResult&gt; task) {
if(!task.isSuccessful()) {
Toast.makeText(RegisterActivity.this,&quot;SignUp Unsuccessful, Try again&quot;,Toast.LENGTH_SHORT).show();
}
else {
startActivity(new Intent(RegisterActivity.this, WaterActivity.class));
}
}
});
}
else {
Toast.makeText(RegisterActivity.this,&quot;Error!&quot;,Toast.LENGTH_SHORT).show();
}
}
});
tvSignIn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent i = new Intent (RegisterActivity.this, LoginActivity.class);
startActivity(i);
}
});
}
}
package com.example.spaceattack;
import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
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 com.google.firebase.auth.FirebaseUser;
public class LoginActivity extends AppCompatActivity {
EditText emailId, password;
Button btnSignUp;
TextView tvSignUp;
FirebaseAuth mFirebaseAuth;
private FirebaseAuth.AuthStateListener mAuthStateListener;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_login);
mFirebaseAuth = FirebaseAuth.getInstance();
emailId = findViewById(R.id.editText);
password = findViewById(R.id.editText2);
btnSignUp = findViewById(R.id.button2);
tvSignUp = findViewById(R.id.textView2);
mAuthStateListener = new FirebaseAuth.AuthStateListener() {
@Override
public void onAuthStateChanged(@NonNull FirebaseAuth firebaseAuth) {
FirebaseUser mFirebaseUser = mFirebaseAuth.getCurrentUser();
if (mFirebaseUser != null) {
Toast.makeText(LoginActivity.this, &quot;Logged in&quot;, Toast.LENGTH_SHORT).show();
Intent i = new Intent(LoginActivity.this, MainActivity.class);
startActivity(i);
} else {
Toast.makeText(LoginActivity.this, &quot;Please Login&quot;, Toast.LENGTH_SHORT).show();
}
}
};
btnSignUp.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
String email = emailId.getText().toString();
String pwd = password.getText().toString();
if (email.isEmpty()) {
emailId.setError(&quot;Please enter email id&quot;);
emailId.requestFocus();
} else if (pwd.isEmpty()) {
password.setError(&quot;Enter your password&quot;);
password.requestFocus();
} else if (email.isEmpty() &amp;&amp; pwd.isEmpty()) {
Toast.makeText(LoginActivity.this, &quot;Fields are Empty&quot;, Toast.LENGTH_SHORT).show();
} else if (!(email.isEmpty() &amp;&amp; pwd.isEmpty())) {
mFirebaseAuth.signInWithEmailAndPassword(email, pwd).addOnCompleteListener(LoginActivity.this, new OnCompleteListener&lt;AuthResult&gt;() {
@Override
public void onComplete(@NonNull Task&lt;AuthResult&gt; task) {
if (!task.isSuccessful()) {
Toast.makeText(LoginActivity.this, &quot;Login Error, Please Login Again&quot;, Toast.LENGTH_SHORT).show();
} else {
Intent intToHome = new Intent(LoginActivity.this, WaterActivity.class);
startActivity(intToHome);
}
}
});
} else {
Toast.makeText(LoginActivity.this, &quot;Error!&quot;, Toast.LENGTH_SHORT).show();
}
}
});
tvSignUp.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent intSignUp = new Intent(LoginActivity.this, WaterActivity.class);
startActivity(intSignUp);
}
});
}
@Override
protected void onStart() {
super.onStart();
mFirebaseAuth.addAuthStateListener(mAuthStateListener);
}
}

答案1

得分: 0

你提供的代码中没有任何部分写入Firebase实时数据库，就我所看到的情况而言。请注意，Firebase身份验证仅将用户配置文件写入其自身的内部存储。如果您还希望将该信息存储在数据库中，您将需要在应用程序代码中自行处理。

英文:

None of the code in your question writes to the Firebase Realtime Database as far as I can see. Keep in mind that Firebase Authentication only writes user profiles to its own internal storage. If you also want that information to be stored in the database, you'll have to do that from your application code yourself.

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用户名和密码无法保存在Firebase数据库中。

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