FacebookベースのユーザーをFirebaseに保存

Question

こんにちは、私はAndroid開発の初心者です。私は現在、GoogleのFirebaseをバックエンドシステムとして、基本的なAndroidアプリケーションを構築しようとしています。

「Facebookでログイン」ボタンがあります。このボタンをクリックするたびに、アプリケーションにアクセスするためにユーザーがFacebookの資格情報を入力するダイアログが開きます。それが終わったら、最初にログインしたときに彼の電子メール、名前、およびIDをFirebaseに保存したいのですが、初めてログインするのでなければ彼の情報を更新したいと思います。

このデータを表すために使用するUser（POJO）というクラスを作成しました。私の問題は、私はこの情報を格納するコードをどこに置くべきかわからないということです。

public class MainActivity extends AppCompatActivity { 

    //Declare our view variables 
    private LoginButton mLoginButton; 
    private CallbackManager mCallbackManager; 
    private FirebaseAuth mAuth; 
    private FirebaseAuth.AuthStateListener mAuthListener; 
    private FirebaseDatabase mDatabase; 
    private DatabaseReference mDatabaseReference; 

    private static final String TAG = "MainActivity"; 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     FacebookSdk.sdkInitialize(getApplicationContext()); 
     setContentView(R.layout.activity_main); 

     //Initialize callback manager 
     mCallbackManager = CallbackManager.Factory.create(); 

     //Assign the views to the corresponding variables 
     mLoginButton = (LoginButton) findViewById(R.id.login_button); 

     //Assign the button permissions 
     mLoginButton.setReadPermissions("email", "public_profile"); 

     //Create instance of database 
     mDatabase = FirebaseDatabase.getInstance(); 
     mDatabaseReference = mDatabase.getReference(); 

     //Assign the button a task 
     mLoginButton.registerCallback(mCallbackManager, new FacebookCallback<LoginResult>() { 
      @Override 
      public void onSuccess(LoginResult loginResult) { 
       Log.d(TAG, "facebook:onSuccess:" + loginResult); 
       handleFacebookAccessToken(loginResult.getAccessToken()); 
      } 

      @Override 
      public void onCancel() { 
       Log.d(TAG, "facebook:onCancel"); 
      } 

      @Override 
      public void onError(FacebookException error) { 
       Log.d(TAG, "facebook:onError", error); 
      } 
     }); 

     // Initialize Firebase Auth 
     mAuth = FirebaseAuth.getInstance(); 

     mAuthListener = new FirebaseAuth.AuthStateListener() { 
      @Override 
      public void onAuthStateChanged(@NonNull FirebaseAuth firebaseAuth) { 
       //Get currently logged in user 
       FirebaseUser user = firebaseAuth.getCurrentUser(); 

       if (user != null) { 
        // User is signed in 
        Log.d(TAG, "onAuthStateChanged:signed_in:" + user.getUid()); 

        // Name, email address 
        String name = user.getDisplayName(); 
        String email = user.getEmail(); 

        // The user's ID, unique to the Firebase project. Do NOT use this value to 
        // authenticate with your backend server, if you have one. Use 
        // FirebaseUser.getToken() instead. 
        String uid = user.getUid(); 

        //Create user 
        final User loggedIn = new User(uid, name, email); 

        mDatabaseReference.child("users").child(loggedIn.getId()).setValue(loggedIn); 

        mDatabaseReference.child("users").addValueEventListener(new ValueEventListener() { 
         @Override 
         public void onDataChange(DataSnapshot dataSnapshot) { 
          // This method is called once with the initial value and again 
          // whenever data at this location is updated. 

         } 

         @Override 
         public void onCancelled(DatabaseError error) { 
          // Failed to read value 
          Log.w(TAG, "Failed to read value.", error.toException()); 
         } 
        }); 

       } else { 
        // User is signed out 
        Log.d(TAG, "onAuthStateChanged:signed_out"); 
       } 
      } 
     }; 
    } 

    @Override 
    protected void onActivityResult(int requestCode, int resultCode, Intent data) { 
     super.onActivityResult(requestCode, resultCode, data); 

     // Pass the activity result back to the Facebook SDK 
     mCallbackManager.onActivityResult(requestCode, resultCode, data); 
    } 

    @Override 
    public void onStart() { 
     super.onStart(); 
     mAuth.addAuthStateListener(mAuthListener); 
    } 

    @Override 
    public void onStop() { 
     super.onStop(); 
     if (mAuthListener != null) { 
      mAuth.removeAuthStateListener(mAuthListener); 
     } 
    } 

    //If user successfully signs in the LoginButton's onSuccess callback method 
    // get an access token for the signed-in user, exchange it for a Firebase credential 
    // and authenticate with Firebase using the Firebase credential 

    private void handleFacebookAccessToken(AccessToken token) { 
     Log.d(TAG, "handleFacebookAccessToken:" + token); 

     AuthCredential credential = FacebookAuthProvider.getCredential(token.getToken()); 
     mAuth.signInWithCredential(credential) 
       .addOnCompleteListener(this, new OnCompleteListener<AuthResult>() { 
        @Override 
        public void onComplete(@NonNull Task<AuthResult> task) { 
         Log.d(TAG, "signInWithCredential:onComplete:" + task.isSuccessful()); 

         // If sign in fails, display a message to the user. If sign in succeeds 
         // the auth state listener will be notified and logic to handle the 
         // signed in user can be handled in the listener. 

         if (!task.isSuccessful()) { 
          Log.w(TAG, "signInWithCredential", task.getException()); 
          Toast.makeText(MainActivity.this, "Authentication failed.", Toast.LENGTH_SHORT).show(); 
         } 
        } 
       }); 
    } 
} 

はここに私のUserクラスです： はここに私のMainActivityクラスです

public class User { 
    private String id; 
    private String name; 
    private String email; 

    public User(){ 

    } 

    public User(String id, String name, String email) { 
     this.id = id; 
     this.name = name; 
     this.email = email; 
    } 

    public String getId() { 
     return id; 
    } 

    public void setId(String id) { 
     this.id = id; 
    } 

    public String getName() { 
     return name; 
    } 

    public void setName(String name) { 
     this.name = name; 
    } 

    public String getEmail() { 
     return email; 
    } 

    public void setEmail(String email) { 
     this.email = email; 
    } 

} 

あなたは既にほとんどの作業を行ってきた

Answer 1

にデータを保存する場所これは、私はGoogleがサービスのエラーを再生避けるために、9.6.0にfirebaseを格下げし、彼は彼でサインした後、私は、ユーザーが保存されていますhandleFacebookAccessTokenメソッドの資格情報

Answer 2

お時間をいただき、ありがとうございますので、私は2を作成するつもりですあなたが使う方法。

protected void getUserInfo(final LoginResult login_result){ 

    GraphRequest data_request = GraphRequest.newMeRequest(
      login_result.getAccessToken(), 
      new GraphRequest.GraphJSONObjectCallback() { 
       @Override 
       public void onCompleted(
         JSONObject object, 
         GraphResponse response) { 
        try { 
         String facebook_id = object.getString("id"); 
         String f_name = object.getString("name"); 
         String email_id = object.getString("email"); 
         String token = login_result.getAccessToken().getToken(); 
         String picUrl = "https://graph.facebook.com/me/picture?type=normal&method=GET&access_token="+ token; 

saveFacebookCredentialsInFirebase(login_result.getAccessToken()); 

        } catch (JSONException e) { 
         // TODO Auto-generated catch block 
        } 
       } 
      }); 
    Bundle permission_param = new Bundle(); 
    permission_param.putString("fields", "id,name,email,picture.width(120).height(120)"); 
    data_request.setParameters(permission_param); 
    data_request.executeAsync(); 
    data_request.executeAsync(); 
} 

あなたはfirebase

private void saveFacebookCredentialsInFirebase(AccessToken accessToken){ 
    AuthCredential credential = FacebookAuthProvider.getCredential(accessToken.getToken()); 
    firebaseAuth.signInWithCredential(credential).addOnCompleteListener(this, new OnCompleteListener<AuthResult>() { 
     @Override 
     public void onComplete(@NonNull Task<AuthResult> task) { 
      if(!task.isSuccessful()){ 
       Toast.makeText(getApplicationContext(),"Error logging in", Toast.LENGTH_LONG).show(); 
      }else{ 
       Toast.makeText(getApplicationContext(),"Login in Successful", Toast.LENGTH_LONG).show(); 
      } 
     } 
    });  
}