Im very new new to Firebase and Im creating my first app.
我是Firebase的新手,我创建了我的第一个应用程序。
Im having 2 issues that I would like to get some help please.
我有2个问题,我想得到一些帮助。
I have linked my Android Studio application to my Firebase project and created the code for the Sigup of new user.
我已将Android Studio应用程序链接到Firebase项目,并为新用户的Sigup创建了代码。
SignupActivity.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() {
@Override
public void onComplete(@NonNull Task 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);
}
}
LogCat
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
The first issue is that the application is crashing when I click on the mSignup button.
第一个问题是当我点击mSignup按钮时应用程序崩溃了。
Thesecond issue is that I would like to know how I can add a Unique Username to each registerd user.
第二个问题是我想知道如何为每个注册用户添加唯一用户名。
Please help me figure out how to fix these 2 issues.
请帮我弄清楚如何解决这两个问题。
Thanks
1
This is the error:
这是错误:
`Attempt to invoke virtual method 'void android.widget.ProgressBar.setVisibility(int)' on a null object reference`
the progressbar is null, you need to add this:
进度条为空,您需要添加以下内容:
mProgressBar = (ProgressBar) findViewById(R.id.progressBar); //your id in xml
Regarding unique username for each user, you can do this:
关于每个用户的唯一用户名,您可以这样做:
FirebaseUser currentperson=FirebaseAuth.getInstance().getCurrentUser();
then if you are saving to the database, you can do this:
然后,如果要保存到数据库,则可以执行以下操作:
DatabaseReference ref=FirebaseDatabase.getInstance().getReference().child("Users");
ref.child(currentperson.getUid());
The above will add a unique userid to each username.
以上将为每个用户名添加唯一的用户ID。
If you mean to add a unique username in authentication, you cannot do that. But the email is unique there by default so if you try to register another user with same email then you will get error:authentication failed
如果您要在身份验证中添加唯一的用户名,则无法执行此操作。但默认情况下,电子邮件是唯一的,因此如果您尝试使用相同的电子邮件注册其他用户,则会收到错误:验证失败
Edit:
You cannot add username in authentication, if you go to the console then you will see the userid and email there added. The authentication provides you with a userid but username cannot be added in the authentication, it can only be added in the database, can do this:
您无法在身份验证中添加用户名,如果您转到控制台,则会看到添加的用户ID和电子邮件。身份验证为您提供了一个用户标识,但是在身份验证中无法添加用户名,它只能添加到数据库中,可以这样做:
DatabaseReference ref=FirebaseDatabase.getInstance().getReference().child("Users").child(currentperson.getUid());
ref.child("Username").setValue(name);
then in your firebase database you would have this:
然后在你的firebase数据库中你会有这个:
Users
LA0rRvP4TrewYbMSl0bDA3ork8h2
Username: hisname_here
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