我已经在我的Android应用中实施了 Google登录，以便使用Google的Firebase数据库。我已按照Google文档中的所有步骤操作，登录本身正常运行。在启动时，应用程序会检查是否已有登录帐户并直接打开主要意图。我的问题是当用户第一次进行登录时。弹出窗体的窗口，用户输入其凭据。当所有内容都已经过检查时，Google登录弹出窗口会消失，然后会返回我的登录意图，其样式更褪色（我不知道这是否正常）以及用户是否想成为重定向到主要意图，他必须再次点击“谷歌登录按钮”，他被重定向（无需再次输入凭据）。你知道可能导致这个问题的原因吗？登录是可用的，这个小的修正可能对用户来说有点无聊...... 以下是我的完整Google Signin API代码：
public class LoginActivity extends AppCompatActivity
{
//SharedPreferences prefs = null;
private SignInButton mGoogleBtn;
private static final int RC_SIGN_IN = 1;
private GoogleApiClient mGoogleApiClient;
private FirebaseAuth mAuth;
private static final String TAG = "LOGIN_ACTIVITY";
private FirebaseAuth.AuthStateListener mAuthListener;
private DatabaseReference mDatabase;
@Override
/**************************************** Função principal *****************************************/
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_login);
/************************ ESCONDER BARRA DE NAVEGAÇÃO ************************/
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT)
{
int UI_OPTIONS = View.SYSTEM_UI_FLAG_HIDE_NAVIGATION | View.SYSTEM_UI_FLAG_FULLSCREEN | View.SYSTEM_UI_FLAG_LAYOUT_STABLE | View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY | View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION;
getWindow().getDecorView().setSystemUiVisibility(UI_OPTIONS);
}
mAuth = FirebaseAuth.getInstance();
mGoogleBtn = findViewById(R.id.btnGoogle);
/* Configurar o Signin do Google */
GoogleSignInOptions gso = new
GoogleSignInOptions.Builder(GoogleSignInOptions.DEFAULT_SIGN_IN)
.requestIdToken(getString(R.string.default_web_client_id))
.requestEmail()
.build();
mGoogleApiClient = new GoogleApiClient.Builder(getApplicationContext())
.enableAutoManage(this, new GoogleApiClient.OnConnectionFailedListener()
{
@Override
public void onConnectionFailed(@NonNull ConnectionResult connectionResult)
{
Toast.makeText(LoginActivity.this, "You got an Error", Toast.LENGTH_LONG).show();
}
})
.addApi(Auth.GOOGLE_SIGN_IN_API, gso)
.build();
/* Caso o utilizador tenha carregado no botão de SignIn, executa esta função */
mGoogleBtn.setOnClickListener(new View.OnClickListener()
{
@Override
public void onClick(View view)
{
signIn();
}
});
/***************************************** Declarações *****************************************/
/* TextViews */
TextView txtTituloLogin = findViewById(R.id.txtTitleLogin);
TextView txtDescLogin = findViewById(R.id.txtDescLogin);
/* TypeFaces */
Typeface tpTitulos = Typeface.createFromAsset(getAssets(),"fonts/RobotoSlab-Bold.ttf");
Typeface tpDesc = Typeface.createFromAsset(getAssets(),"fonts/RobotoSlab-Light.ttf");
/************************************* Fim das declarações *************************************/
/* Adiciona a TypeFace às TextViews */
txtTituloLogin.setTypeface(tpTitulos);
txtDescLogin.setTypeface(tpDesc);
/***************************************** Login *****************************************/
/* Verifica se o utilizador atual é diferente de nulo, caso seja, abre a Main Activity */
mAuthListener = new FirebaseAuth.AuthStateListener()
{
@Override
public void onAuthStateChanged(@NonNull FirebaseAuth firebaseAuth)
{
if(firebaseAuth.getCurrentUser() != null)
{
Intent intentSplash = new Intent(LoginActivity.this, MainActivity.class); // Cria o intent "intentSplash"
startActivity(intentSplash); // Começa o intent para a SplashActivity
finish();
}
}
};
/***************************************** Fim do Login *****************************************/
/***************************************** Fim da função principal *****************************************/
}
@Override
protected void onStart()
{
super.onStart();
mAuth.addAuthStateListener(mAuthListener);
}
private void signIn()
{
Intent signInIntent = Auth.GoogleSignInApi.getSignInIntent(mGoogleApiClient);
startActivityForResult(signInIntent, RC_SIGN_IN);
}
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data)
{
super.onActivityResult(requestCode, resultCode, data);
// Result returned from launching the Intent from GoogleSignInApi.getSignInIntent(...);
if (requestCode == RC_SIGN_IN)
{
GoogleSignInResult result = Auth.GoogleSignInApi.getSignInResultFromIntent(data);
if (result.isSuccess())
{
/* Caso o Login tenha sido efetuado com sucesso, autentica com a Firebase*/
GoogleSignInAccount account = result.getSignInAccount();
firebaseAuthWithGoogle(account);
}
// else
// {
// Google Sign In failed, update UI appropriately
// ...
//}
}
}
private void firebaseAuthWithGoogle(GoogleSignInAccount account) {
AuthCredential credential = GoogleAuthProvider.getCredential(account.getIdToken(), null);
mAuth.signInWithCredential(credential)
.addOnCompleteListener(this, new OnCompleteListener<AuthResult>()
{
@Override
public void onComplete(@NonNull Task<AuthResult> task)
{
if (task.isSuccessful())
{
/* Se o login der certo, atualiza as informações do utilizador */
Log.d(TAG, "signInWithCredential:success");
FirebaseUser user = mAuth.getCurrentUser();
Global.google_profile_id = user.getUid();
Global.google_full_name = user.getDisplayName();
Global.google_email = user.getEmail();
Global.google_profile_pic = user.getPhotoUrl();
SharedPreferences sp =
PreferenceManager.getDefaultSharedPreferences(getApplicationContext());
SharedPreferences.Editor editor;
editor = getSharedPreferences("GoogleInfo",
MODE_PRIVATE).edit();
editor.putString("google_profile_id",Global.google_profile_id);
editor.putString("google_full_name",Global.google_full_name);
editor.putString("google_email",Global.google_email);
editor.putString("google_profile_pic",
String.valueOf(Global.google_profile_pic));
editor.apply();
/* Faz uma referência à Base de Dados */
mDatabase =
FirebaseDatabase.getInstance().getReference();
Database.child("utilizadores").
child(Global.google_profile_id).child("Nome").
setValue(Global.google_full_name);
mDatabase.child("utilizadores").
child(Global.google_profile_id).
child("Email").setValue(Global.google_email);
//updateUI(user);
}
else
{
/* Se o login der erro, mostra a mensagem ao
utilizador*/
Log.w(TAG, "signInWithCredential:failure",
task.getException());
Toast.makeText(LoginActivity.this, "Erro ao efetuar
o login.", // Mensagem de erro
Toast.LENGTH_SHORT).show();
// updateUI(null);
}
// ...
}
});
}
这个updateUI(null);在评论中，因为如果我取消注释，它会获得红色错误颜色表示它无法解析该方法。这updateUI(null);是否与我遇到的问题有关？有谁知道这行代码使用了什么？与updateUI(user);