java检查云Firestore中是否已存在用户Google登录凭据
我在谷歌登录时遇到了一个问题,每当我使用谷歌登录时,我都会设置要添加到数据库中的凭据(如:姓名和电子邮件),但问题是,所有这些都正常工作,只是现在每次我使用同一个谷歌帐户登录时,它都会再次添加到数据库中(一遍又一遍地添加相同的凭据),因此,我想检查数据库中是否已经存在Google登录凭据,无需全部添加凭据
以下是onCreate中的Google登录代码:
private FirebaseAuth firebaseAuth;
private FirebaseFirestore firebaseFirestore;
private GoogleSignInClient mGoogleSignInClient;
private static final int RC_SIGN_IN = 100;
googleImageBtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
progresBarDim.setVisibility(View.VISIBLE);
signIn();
}
});
// TODO : Firebase Authentication
firebaseAuth = FirebaseAuth.getInstance();
firebaseFirestore = FirebaseFirestore.getInstance();
googleRequest();
以下是谷歌登录的方法:
private void googleRequest(){
// Configure Google Sign In
GoogleSignInOptions gso = new GoogleSignInOptions.Builder(GoogleSignInOptions.DEFAULT_SIGN_IN)
.requestIdToken(getString(R.string.default_web_client_id))
.requestEmail()
.build();
// Build a GoogleSignInClient with the options specified by gso.
mGoogleSignInClient = GoogleSignIn.getClient(this, gso);
}
private void signIn() {
Intent signInIntent = mGoogleSignInClient.getSignInIntent();
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) {
Task<GoogleSignInAccount> task = GoogleSignIn.getSignedInAccountFromIntent(data);
try {
// Google Sign In was successful, authenticate with Firebase
GoogleSignInAccount account = task.getResult(ApiException.class);
firebaseAuthWithGoogle(account);
} catch (ApiException e) {
progresBarDim.setVisibility(View.GONE);
// Google Sign In failed, update UI appropriately
Toast.makeText(this, e.getMessage(), Toast.LENGTH_SHORT).show();
// ...
}
}
}
private void firebaseAuthWithGoogle(GoogleSignInAccount acct) {
AuthCredential credential = GoogleAuthProvider.getCredential(acct.getIdToken(), null);
firebaseAuth.signInWithCredential(credential)
.addOnCompleteListener(this, new OnCompleteListener<AuthResult>() {
@Override
public void onComplete(@NonNull Task<AuthResult> task) {
if (task.isSuccessful()) {
GoogleSignInAccount signInAccount = GoogleSignIn.getLastSignedInAccount(LoginActivity.this);
final String name = signInAccount.getDisplayName().trim();
final String email =signInAccount.getEmail().trim();
Map<Object, String> userdata = new HashMap<>();
userdata.put("Nom et prénom", name);
userdata.put("Address émail", email);
firebaseFirestore.collection("USERS")
.add(userdata);
// Sign in success, update UI with the signed-in user's information
FirebaseUser user = firebaseAuth.getCurrentUser();
Intent intent = new Intent(LoginActivity.this, ProfileActivity.class);
startActivity(intent);
} else {
progresBarDim.setVisibility(View.GONE);
// If sign in fails, display a message to the user.
Toast.makeText(LoginActivity.this, "sorry auth failed!", Toast.LENGTH_SHORT).show();
}
progresBarDim.setVisibility(View.GONE);
// ...
}
});
}
# 1 楼答案
之所以会发生这种情况,是因为您一次又一次地添加数据。以下代码行负责此行为:
使用add(Object data)时:
因此,每次调用上述代码行时,都会创建一个新文档。要解决此问题,应将数据添加到特定位置,例如,在以下引用处:
您可以使用以下代码行从
FirebaseUser
对象获取uid
:现在,要编写数据,请使用以下代码:
但是我没有使用
add()
,而是在DocumentReference对象上使用了set()
。为了避免每次用户登录Google时都写入数据,您需要检查该用户是否已经存在,这可以使用我在以下帖子中的回答来完成:但是,您不应该检查用户名,而应该检查
uid
另外,在设置标记时,您的代码表明您正在使用Cloud Firestore和而不是Firebase实时数据库