java - 如何检查用户是否已经登录谷歌身份验证。在安卓中

Question

我是一名新的 Android 开发人员，也是一名学生。我很难判断用户是否已经登录我的应用程序。我将展示我的一些代码。我非常感谢您的帮助和回答。

登录.java

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.login);

    OptionalPendingResult<GoogleSignInResult> opr = Auth.GoogleSignInApi.silentSignIn(mGoogleApiClient);

    if(opr.isDone()) {
        Log.d(TAG,"Got cached sign-in");
        GoogleSignInResult result = opr.get();
        handleSignInResult(result);
    } else {
        SignInButton mGoogleSignInButton = (SignInButton) findViewById(R.id.sign_in_button);
        mStatusView = (TextView) findViewById(R.id.status_text);
        mGoogleSignInButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                switch (v.getId()) {
                    case R.id.sign_in_button:
                        signInWithGoogle();
                }
            }
        });
    }
}
 private void signInWithGoogle(){
    if(mGoogleApiClient != null) {
        mGoogleApiClient.disconnect();
    }

    GoogleSignInOptions gso = new GoogleSignInOptions.Builder(GoogleSignInOptions.DEFAULT_SIGN_IN).requestEmail().build();
    mGoogleApiClient = new GoogleApiClient.Builder(this).addApi(Auth.GOOGLE_SIGN_IN_API,gso).build();

    final 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);

    if(requestCode == RC_SIGN_IN) {
        GoogleSignInResult result = Auth.GoogleSignInApi.getSignInResultFromIntent(data);
        handleSignInResult(result);
    }
}



private void handleSignInResult(GoogleSignInResult result) {
    Log.d(TAG, "handleSignInResult:" + result.isSuccess());
    if(result.isSuccess()) {
        GoogleSignInAccount account = result.getSignInAccount();
        mStatusView.setText(getString(R.string.signed_in_fmt, account.getDisplayName()));
        //TODO: Start another explicit intent here. but this time, start MainActivity
        Intent intent = new Intent(Login.this , MainActivity.class);
        startActivity(intent);
        finish();

    } else {

    }
}

我哪里出错了？

Answer 1

GoogleApiClient mGoogleApiClient 现已弃用!所以根据doc

   // Check for existing Google Sign In account, if the user is already signed in
// the GoogleSignInAccount will be non-null.
GoogleSignInAccount account = GoogleSignIn.getLastSignedInAccount(this);
updateUI(account);

例如:

 if (GoogleSignIn.getLastSignedInAccount(context) == null) {
            Log.d(TAG_SIGN_FLOW, "User is not signed in, so make login in")

            val signInOptions: GoogleSignInOptions = GoogleSignInOptions.Builder(GoogleSignInOptions.DEFAULT_SIGN_IN)
                .requestEmail()
                .requestScopes(Scope(DriveScopes.DRIVE_FILE))
                .build()
            startActivityForResult(GoogleSignIn.getClient(this.requireActivity(), signInOptions).signInIntent, REQUEST_CODE_SIGN_IN)
        } else {
            Log.d(TAG_SIGN_FLOW, "User has already been login")
        }