[英]Firebase User Registration / Authentication with Username
我是 Firebase 的新手,我正在創建我的第一個應用程序。
我有 2 個問題,我想得到一些幫助。
我已將我的 Android Studio 應用程序鏈接到我的 Firebase 項目,並為新用戶的 Sigup 創建了代碼。
注冊活動.java
package com.company.fbaseapp.activities;
import android.content.Intent;
import android.support.annotation.NonNull;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.WindowManager;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ProgressBar;
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.company.fbaseapp.R;
public class SignupActivity extends AppCompatActivity {
private static final String TAG = "SignupActivity";
private EditText mUsername;
private EditText mEmail;
private EditText mPassword;
private Button mSignup;
private ProgressBar mProgressBar;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_signup);
//mUsername = (EditText) findViewById(R.id.input_username);
mEmail = (EditText) findViewById(R.id.input_email);
mPassword = (EditText) findViewById(R.id.input_password);
mSignup = (Button) findViewById(R.id.btn_signup);
mSignup.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Log.d(TAG, "onClick: attempting to signup.");
// Check for null valued EditText fields
if (!isEmpty (mEmail.getText().toString()) && !isEmpty (mPassword.getText().toString())) {
signupNewUser(mEmail.getText().toString(), mPassword.getText().toString());
//Toast.makeText(SignupActivity.this, "Thank you for signing up", Toast.LENGTH_SHORT).show();
}
else {
Toast.makeText(SignupActivity.this, "You must fill out all the fields", Toast.LENGTH_SHORT).show();
}
}
} );
hideSoftKeyboard();
}
private void signupNewUser(String email, String password) {
showDialog();
FirebaseAuth.getInstance().createUserWithEmailAndPassword(email, password)
.addOnCompleteListener( new OnCompleteListener<AuthResult>() {
@Override
public void onComplete(@NonNull Task<AuthResult> task) {
Log.d(TAG, "onComplete: onComplete: " + task.isSuccessful());
if (task.isSuccessful()) {
Log.d(TAG, "onComplete: AuthState: " + FirebaseAuth.getInstance()
.getCurrentUser()
.getUid());
FirebaseUser currentperson=FirebaseAuth.getInstance().getCurrentUser();
DatabaseReference ref=FirebaseDatabase.getInstance().getReference().child("Users").child(currentperson.getUid());
ref.child("Username").setValue(name);
FirebaseAuth.getInstance().signOut();
redirectLoginScreen();
}
if (!task.isSuccessful()) {
Toast.makeText(SignupActivity.this, "Unable to signup", Toast.LENGTH_SHORT).show();
}
}
});
}
/**
* Return true if the @param is null
* @param string
* @return
*/
private boolean isEmpty(String string){
return string.equals("");
}
/**
* Redirects the user to the login screen
*/
private void redirectLoginScreen(){
Log.d(TAG, "redirectLoginScreen: redirecting to login screen.");
Intent intent = new Intent(SignupActivity.this, LoginActivity.class);
startActivity(intent);
finish();
}
private void showDialog(){
mProgressBar.setVisibility(View.VISIBLE);
}
private void hideDialog(){
if(mProgressBar.getVisibility() == View.VISIBLE){
mProgressBar.setVisibility(View.INVISIBLE);
}
}
private void hideSoftKeyboard(){
this.getWindow().setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_STATE_ALWAYS_HIDDEN);
}
}
日志貓
12-30 01:19:18.492 31917-31917/com.company.fbaseapp D/SignupActivity: onClick: attempting to signup.
12-30 01:19:18.493 31917-31917/com.company.fbaseapp D/AndroidRuntime: Shutting down VM
12-30 01:19:18.497 31917-31917/com.company.fbaseapp E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.company.fbaseapp, PID: 31917
java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.ProgressBar.setVisibility(int)' on a null object reference
at com.company.fbaseapp.activities.SignupActivity.showDialog(SignupActivity.java:126)
at com.company.fbaseapp.activities.SignupActivity.signupNewUser(SignupActivity.java:72)
at com.company.fbaseapp.activities.SignupActivity.access$300(SignupActivity.java:21)
at com.company.fbaseapp.activities.SignupActivity$1.onClick(SignupActivity.java:54)
at android.view.View.performClick(View.java:6289)
at android.view.View$PerformClick.run(View.java:24800)
at android.os.Handler.handleCallback(Handler.java:789)
at android.os.Handler.dispatchMessage(Handler.java:98)
at android.os.Looper.loop(Looper.java:164)
at android.app.ActivityThread.main(ActivityThread.java:6809)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:240)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:767)
12-30 01:19:18.499 31917-31917/com.company.fbaseapp D/AppTracker: App Event: crash
第一個問題是當我單擊mSignup按鈕時應用程序崩潰。
第二個問題是我想知道如何為每個注冊用戶添加唯一用戶名。
請幫我弄清楚如何解決這兩個問題。
謝謝
這是錯誤:
`Attempt to invoke virtual method 'void android.widget.ProgressBar.setVisibility(int)' on a null object reference`
進度條為空,您需要添加以下內容:
mProgressBar = (ProgressBar) findViewById(R.id.progressBar); //your id in xml
關於每個用戶的唯一用戶名,您可以這樣做:
FirebaseUser currentperson=FirebaseAuth.getInstance().getCurrentUser();
那么如果你要保存到數據庫,你可以這樣做:
DatabaseReference ref=FirebaseDatabase.getInstance().getReference().child("Users");
ref.child(currentperson.getUid());
以上將為每個用戶名添加一個唯一的用戶 ID。
如果您想在身份驗證中添加唯一的用戶名,則不能這樣做。 但是默認情況下電子郵件在那里是唯一的,因此如果您嘗試使用同一電子郵件注冊另一個用戶,那么您將收到error:authentication failed
編輯:
您不能在身份驗證中添加username
,如果您轉到控制台,您將看到添加的userid
和email
。 認證給你提供了一個userid
但是userid
不能在認證中添加,只能在數據庫中添加,可以這樣做:
DatabaseReference ref=FirebaseDatabase.getInstance().getReference().child("Users").child(currentperson.getUid());
ref.child("Username").setValue(name);
然后在您的 firebase 數據庫中,您將擁有:
Users
LA0rRvP4TrewYbMSl0bDA3ork8h2
Username: hisname_here
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