执行命令firebase auth

Question

我正在尝试使用 facebook sdk 和 android 中的“用户/密码”选项使用 firebase 身份验证登录。我需要知道用户在启动 MainActivity 之前使用了哪种身份验证。

几天前代码可以正常工作，但我不得不删除 firebase 项目。今天我配置了firebase/facebook sdk，它可以工作了。但是现在代码的执行顺序不同了（我知道很奇怪）。

之前，onComplete 方法（当我验证任务是否成功时）先执行，然后再执行onAuthStateChanged。但是现在先执行onAuthStateChanged 方法，然后启动其他活动，然后验证任务是否成功。我在调试模式下看到了这种行为。

这是代码示例，我提前感谢您的帮助

fbLoginButton.registerCallback(callbackManager, new FacebookCallback<LoginResult>() {
        @Override
        public void onSuccess(LoginResult loginResult) {
            //Inicio de sesion con facebook exitoso
            handleFacebookAccessToken(loginResult.getAccessToken());
        }

        @Override
        public void onCancel() {
            //Inicio de sesion con facebook cancelado
            Toast.makeText(getApplicationContext(),R.string.cancel_fb_log,Toast.LENGTH_SHORT).show();
        }

        @Override
        public void onError(FacebookException error) {
            //Inicio de sesion con facebook erroneo
            Toast.makeText(getApplicationContext(),R.string.error_fb_log,Toast.LENGTH_SHORT).show();
        }
    });



private void handleFacebookAccessToken(AccessToken accessToken) {
    relativeLayout.setVisibility(View.GONE);
    relativeLayout1.setVisibility(View.VISIBLE);
    AuthCredential credential = FacebookAuthProvider.getCredential(accessToken.getToken());
    //Iniciar sesión con una credencial
    firebaseAuth.signInWithCredential(credential).addOnCompleteListener(this, new OnCompleteListener<AuthResult>() {
        //metodo que se ejecuta al terminar el proceso
        @Override
        public void onComplete(@NonNull Task<AuthResult> task) {
            if (!task.isSuccessful()){
                //Ocurrio un error al realizar el logueo a firebase con facebook
                Utilities.exceptionFirebaseAdministrator(LoginActivity.this, task, LOG_TAG);
                LoginManager.getInstance().logOut();
            }else{
                pref.edit().putBoolean(getString(R.string.pref_logged_with_facebook),true).apply();
                pref.edit().putBoolean(getString(R.string.pref_logged_with_firebase),false).apply();
            }
            relativeLayout.setVisibility(View.VISIBLE);
            relativeLayout1.setVisibility(View.GONE);
        }
    });
}

fireAuthStateListener = new FirebaseAuth.AuthStateListener() {
        @Override
        public void onAuthStateChanged(@NonNull FirebaseAuth firebaseAuth) {
            FirebaseUser user = firebaseAuth.getCurrentUser();

            if(user != null){

//I try use SharedPreference and validate if is facebook login or other
                    startMainActivity();

            }

        }
    };

@Override
public void onStart() {
    super.onStart();
    //Cuando la clase empieza a "escuchar"
    firebaseAuth.addAuthStateListener(fireAuthStateListener);
}

@Override
public void onStop() {
    super.onStop();
    //Cuando la clase deja de "escuchar"
    firebaseAuth.removeAuthStateListener(fireAuthStateListener);
}

Answer 1

在您的代码中进行此更改，

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
        // this is the login layout change it to yours.
    setContentView(R.layout.activity_login);

    // START initialize_auth
    mAuth = FirebaseAuth.getInstance();
    // START auth_state_listener
    mAuthListener = new FirebaseAuth.AuthStateListener() {
        @Override
        public void onAuthStateChanged(@NonNull FirebaseAuth firebaseAuth) {
            FirebaseUser user = firebaseAuth.getCurrentUser();
              //check if user is  not null 
            if (user != null) {

// below code will triggers as soon as your facebook login task is successful                   


      // this will return provider as facebook,google,twitter,email ,etc

                String provider = user.getProviders().get(0) ;

                  pref.edit().putBoolean(getString(R.string.pref_logged_with_facebook), true).apply();
                  pref.edit().putBoolean(getString(R.string.pref_logged_with_firebase), false).apply();
  //I try use SharedPreference and validate if is facebook login or other
                startMainActivity();


            } else {
                // User is signed out
                Log.d(LOG_TAG, "user signed_out");
                // logout user and open login page .
            }
        }
    };


}

// [START on_start_add_listener]
@Override
public void onStart() {
    super.onStart();
    mAuth.addAuthStateListener(mAuthListener);
}

// [START on_stop_remove_listener]
@Override
public void onStop() {
    super.onStop();
    if (mAuthListener != null) {
        mAuth.removeAuthStateListener(mAuthListener);
    }
}


private void handleFacebookAccessToken(AccessToken accessToken) {
    relativeLayout.setVisibility(View.GONE);
    relativeLayout1.setVisibility(View.VISIBLE);
    AuthCredential credential = FacebookAuthProvider.getCredential(accessToken.getToken());
    //Iniciar sesión con una credencial
    firebaseAuth.signInWithCredential(credential).addOnCompleteListener(this, new OnCompleteListener<AuthResult>() {
        //metodo que se ejecuta al terminar el proceso
        @Override
        public void onComplete(@NonNull Task<AuthResult> task) {
            if (!task.isSuccessful()) {

                // If sign in fails, log message or go back to login page.         
                //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.

                Utilities.exceptionFirebaseAdministrator(LoginActivity.this, task, LOG_TAG);
                LoginManager.getInstance().logOut();
            }
              // this will execute no matter whats happens ,
            relativeLayout.setVisibility(View.VISIBLE);
            relativeLayout1.setVisibility(View.GONE);
        }
    });
}

} 

Answer 2

FirebaseAuth 做了一项棘手的工作，当您启动应用程序时，firebase AuthStateListener 会首先执行以查找任何更改的状态，即用户是否登录或注销。
在您的代码中，您在启动时添加 AuthStateListener，这就是为什么每次您的应用启动时它都会覆盖其他方法并首先执行 AuthStateListener。 在启动时添加 AuthStateListener 并在停止方法中删除它始终是一个好习惯，这也是 firebase 工程师推荐的。 您做对了，在需要用户身份验证的应用程序中，始终检查用户状态，然后执行与他们相关的任何任务。

     Override
    public void onStart() {
super.onStart();
//Cuando la clase empieza a "escuchar"
firebaseAuth.addAuthStateListener(fireAuthStateListener);

}