sharesdk分享到指定平台

sharesdk很容易集成社会化分享。但是一般都是直接弹出popupwindow进行选择分享，集成请看集成sharesdk分享短信第三方登录等
这里要记录下如何进行分享到指定平台，是在集成环境的基础下的。

首先一点要初始化 ShareSDK.initSDK(this);//初始化社会化分享

   private static final int WX_SHARE = 0;    private static final int WX_CIRCLE_SHARE = 1;  private PlatformActionListener platformActionListener = new PlatformActionListener() {        @Override        public void onComplete(Platform platform, int i, HashMap<String, Object> hashMap) {            ToastUitls.getToast(BackToShareActivity.this, "成功" + platform.getName());        }        @Override        public void onError(Platform platform, int i, Throwable throwable) {            ToastUitls.getToast(BackToShareActivity.this, "错误" + platform.getName());        }        @Override        public void onCancel(Platform platform, int i) {            ToastUitls.getToast(BackToShareActivity.this, "取消" + platform.getName());        }    };    private void showShare(int type) {        if (shareModel == null) {            return;        }        switch (type) {            case WX_SHARE:           //通过 Platform.ShareParams来获取分享平台                Platform.ShareParams wechat = new Platform.ShareParams();                //这个一定要写，分享的内容形式。。。网页                wechat.setShareType(Platform.SHARE_WEBPAGE)                //设置分享的标题                wechat.setTitle(shareModel.content);                //分享的文本                wechat.setText(shareModel.name);                //url                wechat.setUrl(shareModel.linkUrl);                //图片                wechat.setImageUrl(shareModel.picture);                Platform weixin = ShareSDK.getPlatform(BackToShareActivity.this,                        Wechat.NAME);                if (!weixin.isClientValid()) {                    //如果没有安装微信客户端，则提醒用户安装                    Toast.makeText(BackToShareActivity.this,                            "微信未安装,请先安装微信",                            Toast.LENGTH_LONG).show();                }                weixin.setPlatformActionListener(platformActionListener);                weixin.share(wechat);                break;            case WX_CIRCLE_SHARE:                Platform.ShareParams wechatMoments = new Platform.ShareParams();                wechatMoments.setShareType(Platform.SHARE_WEBPAGE);                wechatMoments.setTitle(shareModel.content);                wechatMoments.setText(shareModel.name);                wechatMoments.setUrl(shareModel.linkUrl);                wechatMoments.setImageUrl(shareModel.picture);                Platform weixinMoments = ShareSDK.getPlatform(BackToShareActivity.this,                        WechatMoments.NAME);                if (!weixinMoments.isClientValid()) {                    Toast.makeText(BackToShareActivity.this,                            "微信未安装,请先安装微信",                            Toast.LENGTH_LONG).show();                }                weixinMoments.setPlatformActionListener(platformActionListener);                weixinMoments.share(wechatMoments);                break;        }    }