"如何使用 Google 登录从不同的活动中退出用户？"

Question

In my login activity, I am signing in the user using Google Sign-in. I would like the logout button to be in a different activity, but I'm not sure how to implement this. I have looked for solutions online, but all of them use a deprecated library.

public class LoginActivity extends AppCompatActivity {

    @BindView(R.id.sign_in_button) SignInButton signInButton;

    public GoogleSignInClient mGoogleSignInClient;
    private int RC_SIGN_IN;
    private static final String TAG = "Login Activity Error";
    private static GoogleSignInOptions gso;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_login);

        ButterKnife.bind(this);
        signInButton.setSize(SignInButton.SIZE_STANDARD);

        gso = new GoogleSignInOptions.Builder(GoogleSignInOptions.DEFAULT_SIGN_IN)
                .requestEmail()
                .build();

        mGoogleSignInClient = GoogleSignIn.getClient(getApplicationContext(), gso);

        findViewById(R.id.sign_in_button).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Intent signInIntent = mGoogleSignInClient.getSignInIntent();
                startActivityForResult(signInIntent, RC_SIGN_IN);

            }
        });
    }

    @Override
    protected void onStart() {
        super.onStart();
        GoogleSignInAccount account = GoogleSignIn.getLastSignedInAccount(this);
        updateUI(account);
    }

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

        if (requestCode == RC_SIGN_IN) {
            Task<GoogleSignInAccount> task = GoogleSignIn.getSignedInAccountFromIntent(data);
            handleSignInResult(task);
        }
    }

    private void handleSignInResult(Task<GoogleSignInAccount> completedTask) {
        try {
            GoogleSignInAccount account = completedTask.getResult(ApiException.class);

            updateUI(account);
        } catch (ApiException e) {
            Log.w(TAG, "signInResult:failed code=" + e.getStatusCode());
            updateUI(null);
        }
    }

    private void updateUI(GoogleSignInAccount account) {
        if (account != null) {
            Intent intent = new Intent(LoginActivity.this, MainActivity.class);
            intent.putExtra(MainActivity.PERSON_NAME, account.getDisplayName());
            intent.putExtra(MainActivity.PERSON_FAMILY_NAME, account.getGivenName());
            intent.putExtra(MainActivity.PERSON_GIVEN_NAME, account.getFamilyName());
            intent.putExtra(MainActivity.PERSON_EMAIL, account.getEmail());
            intent.putExtra(MainActivity.PERSON_ID, account.getId());
            intent.putExtra(MainActivity.PERSON_PHOTO, account.getPhotoUrl());
            startActivity(intent);
        }
    }
}

Answer 1

Just for a reference. This is what I've done to sign out a user from an activity(HomeActivity) other than LoginActivity. What you need to do is call the signOut() method either from onCreate() or onStart() method in LoginActivty and start LoginActivty from another Activty(HomeActivity in my case) when you want user to sign out.

LoginActivity

 protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    ...
    ...
       // I've used session to save  current user availibility in shared preference to
       //check if user is already logged in or not
    if (session.isLoggedIn()) {
        // User is already logged in. Take him to main activity
        Intent intent = new Intent(LoginActivity.this,
                HomeActivity.class);
        startActivity(intent);
        finish();
    } else {
        //This is what you need to do.
        signOut();
        revokeAccess();
    }
    ...
    ...
}

HomeActivity

    private void logoutUser() {
    session.setLogin(false);
    // Launching the login activity
    Intent intent = new Intent(HomeActivity.this, LoginActivity.class);
    startActivity(intent);
    finish();
}

Hope it helps.

Answer 2

In the activity where you want to do the logout, you could do something like this:

findViewById(R.id.logout_button).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                GoogleSignInClient googleSignInClient = GoogleSignIn.getClient(getApplicationContext(), GoogleSignInOptions.DEFAULT_SIGN_IN);
                signOut(googleSignInClient);
                revokeAccess(googleSignInClient);
            }
        });

The definitions of signOut() and revokeAccess() can be found here .

The important thing is that, in both the activities, you pass to GoogleSignIn.getClient() the application context and not the activity context.

Answer 3

Try this

Use below code and also clear all saved data as well

if (mGoogleApiClient.isConnected()) {
                Plus.AccountApi.clearDefaultAccount(mGoogleApiClient);
                mGoogleApiClient.disconnect();
                mGoogleApiClient.connect();
            }