我是用这段代码分享的：

public class WxUtils {
    private static final String APP_ID = "xxx";

    private IWXAPI api;

    public void regToWx(Context context) {
        api = WXAPIFactory.createWXAPI(context, APP_ID, true);
        api.registerApp(APP_ID);
        WeakReference<WxUtils> self = new WeakReference<>(this);
        context.registerReceiver(new BroadcastReceiver() {
            @Override
            public void onReceive(Context context, Intent intent) {
                if (self.get() != null) {
                    self.get().api.registerApp(APP_ID);
                }
            }
        }, new IntentFilter(ConstantsAPI.ACTION_REFRESH_WXAPP));

    }

    public boolean shareToMoments(String url, String text, String description, Bitmap thumbnail, boolean transparent) {
        if (api.getWXAppSupportAPI() >= Build.TIMELINE_SUPPORTED_SDK_INT) {
            share(url, text, description, saveBitmap(thumbnail, transparent), SendMessageToWX.Req.WXSceneTimeline);
            return true;
        } else {
            return false;
        }
    }

    public void shareToChat(String url, String text, String description, Bitmap thumbnail, boolean transparent) {
        share(url, text, description, saveBitmap(thumbnail, transparent), SendMessageToWX.Req.WXSceneSession);
    }

    private void share(String url, String text, String description, byte[] thumbnailBytes, int scene) {
        WXWebpageObject webPage = new WXWebpageObject();
        webPage.webpageUrl = url;

        WXMediaMessage msg = new WXMediaMessage(webPage);
        msg.title = text;
        msg.description = description;
        msg.thumbData = thumbnailBytes;

        SendMessageToWX.Req req = new SendMessageToWX.Req();
        req.transaction = IoUtils.createUuidStr();
        req.message = msg;
        req.scene = scene;
        api.sendReq(req);
    }

    private byte[] saveBitmap(Bitmap bitmap, boolean transparent) {
        Bitmap newBitmap;
        if (transparent) {
            newBitmap = BitmapUtils.scaleBitmap(bitmap, 64, 64);
        } else {
            newBitmap = BitmapUtils.scaleBitmap(bitmap, 256, 256);
        }
        ByteArrayOutputStream os = new ByteArrayOutputStream(1024 * 32);
        Bitmap.CompressFormat format = transparent ? Bitmap.CompressFormat.PNG : Bitmap.CompressFormat.JPEG;
        newBitmap.compress(format, 80, os);
        return os.toByteArray();
    }
}


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