//安卓sdk使用了
api 'com.tencent.mm.opensdk:wechat-sdk-android-without-mta:+'
//注册
private void regToWx() {
    // 通过WXAPIFactory工厂，获取IWXAPI的实例
    api = WXAPIFactory.createWXAPI(this, Config.appKey, true);

    // 将应用的appId注册到微信
    api.registerApp(Config.appKey);

    //建议动态监听微信启动广播进行注册到微信
    registerReceiver(new BroadcastReceiver() {
        @Override
        public void onReceive(Context context, Intent intent) {

            // 将该app注册到微信
            api.registerApp(Config.appKey);
        }
    }, new IntentFilter(ConstantsAPI.ACTION_REFRESH_WXAPP));

}
//分享
public static void share(Task task, Context context) {
    Log.d(Config.TAG, "start share");
    IWXAPI api = MyApplication.getIWXAPI();
    WXWebpageObject webpage = new WXWebpageObject();
    webpage.webpageUrl = task.getUrl();
    WXMediaMessage msg = new WXMediaMessage(webpage);
    msg.title = task.getContext();
    msg.description = task.getContext();
    msg.thumbData = getImgByte(task.getImg(), context);

    SendMessageToWX.Req req = new SendMessageToWX.Req();
    req.transaction = buildTransaction("webpage");
    req.message = msg;
    req.scene = SendMessageToWX.Req.WXSceneTimeline;
    api.sendReq(req);
    Log.d(Config.TAG, "send share msg");
}