[英]How to store user data into Firbase database after authentication?
所以我是 android studio 和 firebase 的新手,我正在做一个 android 应用程序,我需要在其中创建用户角色以查看应用程序(客户端和培训师)中的不同功能。 我知道这不能通过 firebase 身份验证获得,因此建议我将用户详细信息插入数据库并从那里分配/访问角色。 我正在尝试使数据库看起来像这样......
//其中'User1Email'可以是用户的电子邮件或用户ID(因为我认为您不能将@包含到数据库中)
但是我的代码似乎使应用程序崩溃。 我尝试将数据更新到我的 .java 文件中的数据库的方式如下所示。
//ESTABLISH THE CONNECTIONS TO DATABASE AND GET TE USER ID
FirebaseUser user = FirebaseAuth.getInstance().getCurrentUser();
String uid = user.getUid();
FirebaseDatabase database = FirebaseDatabase.getInstance();
final DatabaseReference mRef = database.getReference("users");
EditText emailField = findViewById(R.id.email);
EditText passwordField = findViewById(R.id.password);
//Get email and password from text views
final String email = emailField.getText().toString();
final String password = passwordField.getText().toString();
mRef.child("password").setValue(password);
mRef.child("role").setValue("Trainer");
// I DID ALSO TRY THIS BUT UID STAYS UNDERLINED RED- mRef.child(uid).child("password").setValue(password);
错误:
E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.finalyearapp, PID: 13903
java.lang.IllegalStateException: Could not execute method for android:onClick
at androidx.appcompat.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:402)
at android.view.View.performClick(View.java:6597)
at android.view.View.performClickInternal(View.java:6574)
at android.view.View.access$3100(View.java:778)
at android.view.View$PerformClick.run(View.java:25885)
at android.os.Handler.handleCallback(Handler.java:873)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:193)
at android.app.ActivityThread.main(ActivityThread.java:6669)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858)
Caused by: java.lang.reflect.InvocationTargetException
at java.lang.reflect.Method.invoke(Native Method)
at androidx.appcompat.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:397)
at android.view.View.performClick(View.java:6597)
at android.view.View.performClickInternal(View.java:6574)
at android.view.View.access$3100(View.java:778)
at android.view.View$PerformClick.run(View.java:25885)
at android.os.Handler.handleCallback(Handler.java:873)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:193)
at android.app.ActivityThread.main(ActivityThread.java:6669)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String com.google.firebase.auth.FirebaseUser.getUid()' on a null object reference
at com.example.finalyearapp.SignUpActivity.onClick(SignUpActivity.java:53)
at java.lang.reflect.Method.invoke(Native Method)
at androidx.appcompat.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:397)
at android.view.View.performClick(View.java:6597)
at android.view.View.performClickInternal(View.java:6574)
at android.view.View.access$3100(View.java:778)
at android.view.View$PerformClick.run(View.java:25885)
at android.os.Handler.handleCallback(Handler.java:873)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:193)
at android.app.ActivityThread.main(ActivityThread.java:6669)
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:858)
在获取他的实例之前,您必须对用户进行身份验证。
要确保用户在执行任何操作之前已登录,请在createUserWithEmailAndPassword()
调用getCurrentUser()
方法(如果您使用电子邮件和密码身份验证)。
首先创建并初始化一个 Firebase Auth 对象:
FirebaseAuth mAuth = FirebaseAuth.getInstance();
然后当你想注册时(假设有一个按钮)调用createUserWithEmailAndPassword()
方法:
mAuth.createUserWithEmailAndPassword(email, password)
.addOnCompleteListener(this, new OnCompleteListener<AuthResult>() {
@Override
public void onComplete(@NonNull Task<AuthResult> task) {
if (task.isSuccessful()) {
//Successfully created user
FirebaseUser user = FirebaseAuth.getInstance().getCurrentUser();
String uid = user.getUid();
FirebaseDatabase database = FirebaseDatabase.getInstance();
final DatabaseReference mRef = database.getReference("users");
EditText emailField = findViewById(R.id.email);
//Get email from EditText
final String email = emailField.getText().toString();
mRef.child("role").setValue("Trainer");
} else {
//User not created,
//Print exception
Log.e("Sign up", task.getException().getMessage())
//Write your code to handle user creation fail
}
}
});
如果您想了解有关 Firebase 身份验证的更多信息,请查看此处
请记住,此解决方案仅适用于用户创建。
希望能帮助到你! 写评论以获取更多解释或如果您有其他问题!
在您的数据库中,您有一个大写U
Users
节点,因此您应该更改以下内容:
final DatabaseReference mRef = database.getReference("users");
进入这个:
final DatabaseReference mRef = database.getReference("Users");
您还需要添加一个child()
以包含userId
:
final DatabaseReference mRef = database.getReference("Users").child(uid);
mRef.child("password").setValue(password);
mRef.child("role").setValue("Trainer");
那么你将拥有:
Users
userId
password : password
role : Trainer
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