/**
 * 预下载小程序主包
 *
 * @param preDownloadInfo 预下载信息
 * @param callback 下载回调
 */
public static void preDownloadPkg(PreDownloadInfo preDownloadInfo, IDownloadCallback callback)

PreDownloadInfo downloadInfo = new PreDownloadInfo("appId");
TmfMiniSDK.preDownloadPkg(downloadInfo, new IDownloadCallback() {
    @Override
    public void onFinish(DownloadInfo downloadInfo) {

    }

    @Override
    public void onError(DownloadInfo downloadInfo) {

    }
});

 /**
 * 预下载小程序主包
 * @param preDownloadInfos 预下载信息
 * @param callback 下载回调
 */
public static void preDownloadPkg(List<PreDownloadInfo> preDownloadInfos, IDownloadCallback callback)

PreDownloadInfo downloadInfo = new PreDownloadInfo("appId");
PreDownloadInfo downloadInfo2 = new PreDownloadInfo("appId2");
ArrayList<PreDownloadInfo>infos = new ArrayList<>();
infos.add(downloadInfo);
infos.add(downloadInfo2);
TmfMiniSDK.preDownloadPkg(infos, new IDownloadCallback() {
    @Override
    public void onFinish(DownloadInfo downloadInfo) {
        
    }

    @Override
    public void onError(DownloadInfo downloadInfo) {

    }
});