Android接入谷歌登录

登录谷歌云后台：谷歌后台地址
配置OAuth 2.0 客户端 ID，初始化谷歌登录客户端ID用这里的web客户端ID，同时需要配置Android的客户端ID（对应包名与SHA-1证书）
在build.gradle中添加 google()，同时在dependencies依赖添加
```
implementation 'com.google.android.gms:play-services-auth:20.2.0'
```

初始化谷歌登录，把第二步拷贝的客户端ID配置

    // 初始化谷歌登录
    private void initGoogleSignInClient() {
        GoogleSignInOptions gso = new GoogleSignInOptions.Builder(GoogleSignInOptions.DEFAULT_SIGN_IN)
                .requestIdToken("你的客户端ID")
                .requestEmail()
                .build();
        // Build a GoogleSignInClient with the options specified by gso.
        mGoogleSignInClient = GoogleSignIn.getClient(this, gso);
    }

cocos调用谷歌登录

    /**
     * google登录
     */
    public static void login() {
        Log.d(TAG, "==>login");
        // 使用GoogleSignIn.getLastSignedInAccount方法为当前登录的用户请求个人资料信息。
        GoogleSignInAccount account = GoogleSignIn.getLastSignedInAccount(getActivity().getApplicationContext());
        // 不存在则请求登录
        if (account == null) {
            Intent signInIntent = mGoogleSignInClient.getSignInIntent();
            getActivity().startActivityForResult(signInIntent, RC_SIGN_IN);
        } else {
            Log.d(TAG, "account != null " + account.toString());
            onLoginResp(account);
        }
    }

处理登录数据返回

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if( resultCode != RESULT_OK){
            return;
        }
        if (requestCode == RC_SIGN_IN) {
            Task<GoogleSignInAccount> task = GoogleSignIn.getSignedInAccountFromIntent(data);
            try {
                GoogleSignInAccount account = task.getResult(ApiException.class);
                if (account != null && !account.isExpired()) {
                    Log.d(TAG, "onActivityResult != null" + account.toString());
                    onLoginResp(account);
                } else {
                    Log.w(TAG, "signInResult: null account or expired");
                }
            } catch (ApiException e) {
                Log.w(TAG, "signInResult:failed code=" + e);
                e.printStackTrace();
            }
        }
    }

    // 获取谷歌登录回调
    private static void onLoginResp(GoogleSignInAccount account) {
//         Log.d(TAG, account.toString());
        String token = account.getIdToken();
        String userid = account.getId();
        String nickname = account.getDisplayName();
        String photo = account.getPhotoUrl().toString();
    }

cocos调用谷歌登出

    // 谷歌登出
    public static void singOut(){
        mGoogleSignInClient.signOut().addOnCompleteListener(getActivity(), new OnCompleteListener<Void>() {
            @Override
            public void onComplete(@NonNull Task<Void> task) {
                Log.d(TAG, "==>singOut");
            }
        });
    }