Android 微信分享，分享到朋友圈与分享到好友，以及微信登陆

/**
     * 微信分享
     *
     * @param flag(0:分享到微信好友，1：分享到微信朋友圈)
     */
    private void weChatShare(final int flag) {


        if (wxAPI != null && !wxAPI.isWXAppInstalled()) {
            AppUtils.showToast(mActivity, "您还未安装微信客户端呢");
            return;
        }
        ImageLoader.getInstance().loadImage(shareImageLink.replace("@100Q.jpg", "@100w_100h_1e_100Q.jpg|100x100-2rc.jpg"), new SimpleImageLoadingListener() {
            @Override
            public void onLoadingComplete(String imageUri, View view, Bitmap loadedImage) {
                super.onLoadingComplete(imageUri, view, loadedImage);

                WXWebpageObject webpage = new WXWebpageObject();
                webpage.webpageUrl = shareUrlLink;

                WXMediaMessage msg = new WXMediaMessage(webpage);
                msg.title = shareTitle;
                msg.description = shareContent;
                //这里替换一张自己工程里的图片资源
                Bitmap thumb = loadedImage;
                msg.setThumbImage(thumb);
                SendMessageToWX.Req req = new SendMessageToWX.Req();
                req.transaction = String.valueOf(System.currentTimeMillis());
                req.message = msg;
                req.scene = flag == 0 ? SendMessageToWX.Req.WXSceneSession : SendMessageToWX.Req.WXSceneTimeline;
                wxAPI.sendReq(req);

                Log.e("Share", shareContent + shareTitle + shareUrlLink);
            }
        });
    }

 //Login start：
　　　　　　　IWXAPI WXAPI = WXAPIFactory.createWXAPI(this, AppConstants.KEY_WEIXIN_APP_ID, true);
            WXAPI.registerApp(AppConstants.KEY_WEIXIN_APP_ID);
            SendAuth.Req req = new SendAuth.Req();
            req.scope = "snsapi_userinfo";
            req.state = "wechat_sdk_demo";
            WXAPI.sendReq(req);

 // IWXAPI 是第三方app和微信通信的openapi接口
    private IWXAPI api;

    private Dialog progressDialog;// loading

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        // 通过WXAPIFactory工厂，获取IWXAPI的实例
        api = WXAPIFactory.createWXAPI(this, AppConstants.KEY_WEIXIN_APP_ID, true);
        api.registerApp(AppConstants.KEY_WEIXIN_APP_ID);
        api.handleIntent(getIntent(), this);

    }

    @Override
    protected void onNewIntent(Intent intent) {
        super.onNewIntent(intent);

        setIntent(intent);
        api.handleIntent(intent, this);
    }

    // 微信发送请求到第三方应用时，会回调到该方法
    @Override
    public void onReq(BaseReq req) {
        switch (req.getType()) {
            case ConstantsAPI.COMMAND_GETMESSAGE_FROM_WX:
//                goToGetMsg();
                break;
            case ConstantsAPI.COMMAND_SHOWMESSAGE_FROM_WX:
//                goToShowMsg((ShowMessageFromWX.Req) req);
                break;
            default:
                break;
        }
    }

    // 第三方应用发送到微信的请求处理后的响应结果，会回调到该方法
    @Override
    public void onResp(BaseResp resp) {
        switch (resp.errCode) {
            case BaseResp.ErrCode.ERR_OK:
                progressDialog = DialogUtil.createLoadingDialog(this);
                progressDialog.setCanceledOnTouchOutside(false);
                progressDialog.show();

//                SendAuth.Resp sendResp = (SendAuth.Resp) resp;

                Bundle bundle = new Bundle();
                resp.toBundle(bundle);
                SendAuth.Resp sp = new SendAuth.Resp(bundle);
                String code = sp.code;
                if (code != null && !code.equals("")) {
                    getAccessTokenFromWeiXin(code);
                }
                break;
            case BaseResp.ErrCode.ERR_USER_CANCEL:
                startLoginActivity("用户取消操作");
                break;
            case BaseResp.ErrCode.ERR_AUTH_DENIED:
                startLoginActivity("用户拒绝授权");
                break;
            default:
                break;
        }
    }

    private void getAccessTokenFromWeiXin(String code) {
        //https://api.weixin.qq.com/sns/oauth2/access_token?appid=APPID&secret=SECRET&code=CODE&grant_type=authorization_code

        String requestUrlAppId = "https://api.weixin.qq.com/sns/oauth2/access_token?appid=" + AppConstants.KEY_WEIXIN_APP_ID;
        String requestUrlAppSecret = "&secret=" + AppConstants.KEY_WEIXIN_APP_SECRET;
        String requestUrlCode = "&code=" + code;
        String requestUrlLast = "&grant_type=authorization_code";

        String requestUrl = requestUrlAppId + requestUrlAppSecret + requestUrlCode + requestUrlLast;

        HttpUtil.get(requestUrl, null, new AsyncHttpResponseHandler() {
            @Override
            public void onSuccess(int statusCode, Header[] headers, String content) {
                JSONObject jsonObject = null;
                try {
                    jsonObject = new JSONObject(content);
                    if (jsonObject.has("access_token") && jsonObject.has("openid")) {
                        String access_token = jsonObject.getString("access_token");
                        String openid = jsonObject.getString("openid");
                        getUserInfoFromWeiXin(access_token, openid);
                    } else {
                        AppUtils.showToast(WXEntryActivity.this, "授权失败");
                    }
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }

            @Override
            public void onFailure(int statusCode, Header[] headers, String responseBody, Throwable error) {
                AppUtils.showToast(WXEntryActivity.this, "请求失败，请检查网络重试");
            }

        });
    }

    //https://open.weixin.qq.com/cgi-bin/frame?t=resource/res_main_tmpl&verify=1&lang=zh_CN

    //            "openid":"OPENID",
//            "nickname":"NICKNAME",
//            "sex":1,
//            "province":"PROVINCE",
//            "city":"CITY",
//            "country":"COUNTRY",
//            "headimgurl": "http://wx.qlogo.cn/mmopen/g3MonUZtNHkdmzicIlibx6iaFqAc56vxLSUfpb6n5WKSYVY0ChQKkiaJSgQ1dZuTOgvLLrhJbERQQ4eMsv84eavHiaiceqxibJxCfHe/0",
//            "privilege":[
//            "PRIVILEGE1",
//            "PRIVILEGE2"
//            ],
//            "unionid": " o6_bmasdasdsad6_2sgVt7hMZOPfL"
    private void getUserInfoFromWeiXin(String token, String openid) {
        //https://api.weixin.qq.com/sns/userinfo?access_token=ACCESS_TOKEN&openid=OPENID
        String requestUrl = "https://api.weixin.qq.com/sns/userinfo?access_token=" + token + "&openid=" + openid;
        HttpUtil.get(requestUrl, null, new AsyncHttpResponseHandler() {
            @Override
            public void onSuccess(int statusCode, Header[] headers, String content) {
                JSONObject jsonObject = null;
                try {
                    jsonObject = new JSONObject(content);
                    if (jsonObject.has("nickname")) {
                        String openid = jsonObject.getString("openid");
                        String nickname = jsonObject.getString("nickname");
                        String sex = jsonObject.getString("sex");
                        String province = jsonObject.getString("province");
                        String city = jsonObject.getString("city");
                        String country = jsonObject.getString("country");
                        String headimgurl = jsonObject.getString("headimgurl");
                        String privilege = jsonObject.getString("privilege");
                        String unionid = jsonObject.getString("unionid");
                        postUserInfo2CBServer(unionid, sex, headimgurl, nickname, country, province, city);
                    } else {
                        AppUtils.showToast(WXEntryActivity.this, "授权失败");
                    }
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }


            @Override
            public void onFailure(int statusCode, Header[] headers, String errorResponse, Throwable e) {
                AppUtils.showToast(WXEntryActivity.this, "请求失败，请检查网络重试");
            }
        });
    }