public class MainActivity extends AppCompatActivity implements GoogleApiClient.OnConnectionFailedListener,View.OnClickListener {

    private SignInButton signInButton;
    private GoogleApiClient googleApiClient;
    public static final String TAG="MainActivity";
    private static final int RC_SIGN_IN=1;

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



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

        googleApiClient=new GoogleApiClient.Builder(this).enableAutoManage(this,this)
                .addApi(Auth.GOOGLE_SIGN_IN_API,googleSignInOptions).build();
        signInButton=(SignInButton)findViewById(R.id.mainactivitygooglesigninbutton);
        signInButton.setOnClickListener(this);
        OptionalPendingResult<GoogleSignInResult> googleSignInResultOptionalPendingResult = Auth.GoogleSignInApi.silentSignIn(googleApiClient);
        if(googleSignInResultOptionalPendingResult.isDone()){
            Intent intent=new Intent(this,ContactsActivity.class);
            startActivity(intent);
            finish();
        }


    }

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

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


    @Override
    public void onConnectionFailed(@NonNull ConnectionResult connectionResult) {
        Toast.makeText(getApplicationContext(), "Login Failed", Toast.LENGTH_SHORT).show();
    }

    @Override
    protected 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) {
        if(result.isSuccess()){
            GoogleSignInAccount account=result.getSignInAccount();
            Intent intent=new Intent(this,ContactsActivity.class);
            startActivity(intent);
            finish();
        }
    }


}

成功时，我的应用程序中的完整登录不会移至“联系人活动” . 我已经使用了互联网权限，并且所有活动都在Manifest文件中注册 . 即使在Android Monitor中我也没有收到任何错误，也没有我的应用程序崩溃 .

我在手机中登录了Google和Google Plus帐户 . 点击登录按钮，它会显示选择帐户的选项，但之后没有任何反应 . 我究竟做错了什么？

android google-signin