GoogleApiClient是在一个活动中创建的，我希望它在另一个活动中访问以从Google帐户退出

Question

基本上，我正在创建一个用户可以登录其Google帐户的应用。但是我遇到了一个问题，下面将用代码进行讨论。 我有一个MainActivity，我已经创建了一个GoogleApiClient来登录Google，现在退出后，如果我再次按下登录，那么它将使用相同的帐户登录。我知道这是因为我没有从Google帐户退出，只能从firebase帐户退出。这是我的MainActivity

public class MainActivity extends AppCompatActivity {

private SignInButton mGoogleButton;
private static final int RC_SIGN_IN=1;
private GoogleApiClient mGoogleApiClient;
private FirebaseAuth mAuth;
private FirebaseAuth.AuthStateListener mAuthListener;
private static final String TAG = "Main Activity";


@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    mAuth = FirebaseAuth.getInstance();
    mAuthListener = new FirebaseAuth.AuthStateListener() {
        @Override
        public void onAuthStateChanged(@NonNull FirebaseAuth firebaseAuth) {

            if (firebaseAuth.getCurrentUser() != null)
            {
                startActivity(new Intent(MainActivity.this,GPS.class));
                finish();
            }
        }
    };
    mGoogleButton = (SignInButton) findViewById(R.id.googleButton);



    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(MainActivity.this,"Error Signing",Toast.LENGTH_SHORT)
                            .show();
                }
            }).addApi(Auth.GOOGLE_SIGN_IN_API,gso)
            .build();

    mGoogleButton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            signIn();
        }
    });
}

@Override
protected void onStart() {
    super.onStart();
    mAuth.addAuthStateListener(mAuthListener);

}

private void signIn() {
    Intent signInIntent = Auth.GoogleSignInApi.getSignInIntent(mGoogleApiClient);
    startActivityForResult(signInIntent, RC_SIGN_IN);
}

现在我有另一个Activity，其中我想获得MainActivity的GoogleApiClient，如何在第二个活动中获得相同的GoogleApiClient？我有退出（）但仅限Firebase帐户。这是我的第二项活动。

public class GPS extends AppCompatActivity implements NavigationView.OnNavigationItemSelectedListener {

private DrawerLayout mDrawerLayout;
private ActionBarDrawerToggle mToggle;
private Toolbar mToolbar;
private FirebaseAuth mAuth;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_gps);
    mToolbar = (Toolbar) findViewById(R.id.my_toolbar);
    setSupportActionBar(mToolbar);
    mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
    mToggle = new ActionBarDrawerToggle(this,mDrawerLayout,R.string.open,R.string.close);

    mDrawerLayout.addDrawerListener(mToggle);
    mToggle.syncState();
    getSupportActionBar().setDisplayHomeAsUpEnabled(true);
    NavigationView navigationView = (NavigationView) findViewById(R.id.navigationView);
    navigationView.setNavigationItemSelectedListener(this);
    mAuth = FirebaseAuth.getInstance();
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
    if(mToggle.onOptionsItemSelected(item)){
        return true;
    }

    return super.onOptionsItemSelected(item);
}

@Override
public boolean onNavigationItemSelected(@NonNull MenuItem item) {
   int id=item.getItemId();

        if(id == R.id.nav_account) {
            Toast.makeText(this,"Account Edit Here",Toast.LENGTH_SHORT).show();
        }
       if (id == R.id.settings) {
            Toast.makeText(this,"Settings",Toast.LENGTH_SHORT).show();
        }
        if (id == R.id.logout) {
            mAuth.signOut();
            startActivity(new Intent(GPS.this,MainActivity.class));
            finish();
        }
            //close navigation drawer
    mDrawerLayout.closeDrawer(GravityCompat.START);
    return true;
}

我搜索了所有内容并发现了同样的问题，但是在那里回答是非常困难的。以下是我发现的passing the GoogleApiClient obj from one activity to another