Speichern von Benutzerinformationen in Firebase-Datenbank

Question

Ich versuche, Benutzer ID, Benutzername und PhotoUrl Informationen in Firebase-Datenbank zu speichern. I User POJO Klasse mit privaten Bereichen, Getter/Setter, etc. Dies ist meine UserDao Klasse:

public class UserDao { 

    private static final String USERS_TAG = "users"; 

    private FirebaseDatabase db = FirebaseDatabase.getInstance(); 
    private Map<String, User> users; 
    private User currentUser; 

    .... 

    public void write(User user){ 

     db.getReference(USERS_TAG + "/" + user.getId()).setValue(user); 
    } 

    public boolean userExists(String userId){ 
     return users != null && users.containsKey(userId); 
    } 

    .... 

} 

Diese RegisterEmailPasswordActivity Klasse ist:

public class RegisterEmailPasswordActivity extends BaseActivity { 

    .... 


    public void registerUserWithEmailPassword(View view) { 


     if(view == buttonRegister){ 
      String email = editTextEmail.getText().toString(); 
      String password = editTextPassword.getText().toString(); 
      if(TextUtils.isEmpty(email)){ 
       Toast.makeText(this, "Please enter email", Toast.LENGTH_SHORT).show(); 
       return; 
      } 
      if(TextUtils.isEmpty(password)){ 
       Toast.makeText(this, "Please enter password", Toast.LENGTH_SHORT).show(); 
       return; 
      } 

      progressDialog.setMessage("Registering user... "); 
      progressDialog.show(); 

      firebaseAuth.createUserWithEmailAndPassword(email, password) 
        .addOnCompleteListener(this, new OnCompleteListener<AuthResult>() { 
         @Override 
         public void onComplete(@NonNull Task<AuthResult> task) { 
          if(task.isSuccessful()){ 
           storeToDb(); 
           Toast.makeText(RegisterEmailPasswordActivity.this, "Registered successfully", Toast.LENGTH_SHORT).show(); 

           progressDialog.dismiss(); 
           startActivity(new Intent(RegisterEmailPasswordActivity.this, MainActivity.class)); 
          }else{ 
           Toast.makeText(RegisterEmailPasswordActivity.this, "Registration failed", Toast.LENGTH_SHORT).show(); 

           progressDialog.dismiss(); 

          } 
         } 
        }); 

     } 
    } 

    private void storeToDb(){ 
     final FirebaseUser firebaseUser = FirebaseAuth 
       .getInstance().getCurrentUser(); 
     if (userDao.userExists(firebaseUser.getUid())) { 
      userDao.setCurrentUser(userDao.getUserById(firebaseUser.getUid())); 
     } else { 
      final User user = new User(firebaseUser.getUid(), 
        firebaseUser.getDisplayName(), 
        firebaseUser.getPhotoUrl().toString()); 
      userDao.write(user); 
      userDao.setCurrentUser(user); 
     } 
    } 
} 

Ich erhalte diese Ausnahme:

java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String android.net.Uri.toString()' on a null object reference 
                            at com.example.android.materialdesigncodelab.activity.RegisterEmailPasswordActivity.storeToDb(RegisterEmailPasswordActivity.java:107) 
                            at com.example.android.materialdesigncodelab.activity.RegisterEmailPasswordActivity.access$000(RegisterEmailPasswordActivity.java:25) 
                            at com.example.android.materialdesigncodelab.activity.RegisterEmailPasswordActivity$1.onComplete(RegisterEmailPasswordActivity.java:82) 
                            at com.google.android.gms.tasks.zzc$1.run(Unknown Source) 
                            at android.os.Handler.handleCallback(Handler.java:815) 
                            at android.os.Handler.dispatchMessage(Handler.java:104) 
                            at android.os.Looper.loop(Looper.java:207) 
                            at android.app.ActivityThread.main(ActivityThread.java:5728) 
                            at java.lang.reflect.Method.invoke(Native Method) 
                            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:789) 
                            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:679) 

Also, was mache ich hier falsch?

Answer 1

Ich habe das Problem gefunden. Es war firebaseUser.getPhotoUrl().toString(). Wenn ich die E-Mail-/Passwort-Registrierung verwende, gibt es kein Benutzerfoto. Daher wurde toString() auf null Objekt NullPointerException verursacht.

Answer 2

Müssen Sie Ihren eigenen Auth machen?

Sonst könnte man Firebase UI Auth

verwenden Sie können Benutzer lassen autenticate mit Google-Konto, E-Mail, Facebook, Twitter. Es hängt davon ab, was Sie brauchen.

Hoffe, das hilft.