ProfileActivity.java

public class ProfileActivity extends AppCompatActivity implements View.OnClickListener{

    public static final String GOOGLE_ACCOUNT = "google_account";
    private TextView profileName, profileEmail;
    private ImageView profileImage;
    private GoogleSignInAccount mGoogleSignInAccount;
    private GoogleSignInClient mGoogleSignInClient;

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

        GoogleSignInOptions gso = new GoogleSignInOptions.Builder(GoogleSignInOptions.DEFAULT_SIGN_IN)
                .requestEmail()
                .build();
        // Build a GoogleSignInClient with the options specified by gso.
        mGoogleSignInClient = GoogleSignIn.getClient(this, gso);

        profileName = findViewById(R.id.profile_text);
        profileEmail = findViewById(R.id.profile_email);
        profileImage = findViewById(R.id.profile_image);

        findViewById(R.id.sign_out).setOnClickListener(this);

        mGoogleSignInAccount = getIntent().getParcelableExtra(GOOGLE_ACCOUNT);

        setDataOnView();
    }

    private void setDataOnView() {
        // implementation 'com.squareup.picasso:picasso:2.71828'
        Picasso.get().load(mGoogleSignInAccount.getPhotoUrl()).centerInside().fit().into(profileImage);
        profileName.setText(mGoogleSignInAccount.getDisplayName());
        profileEmail.setText(mGoogleSignInAccount.getEmail());
    }

    @Override
    public void onClick(View v) {
        switch (v.getId()) {
            // ...
            case R.id.sign_out:
                signOut();
                break;
            // ...
        }
    }


    private void signOut() {

        mGoogleSignInClient.signOut().addOnCompleteListener(new OnCompleteListener<Void>() {
            @Override
            public void onComplete(@NonNull Task<Void> task) {
                //On Succesfull signout we navigate the user back to LoginActivity
                Intent intent=new Intent(ProfileActivity.this,LoginActivity.class);
                intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
                startActivity(intent);
            }
        });
    }
}