安卓zip下载和解压

问题是这样的：从服务器拿到.zip压缩文件，然后解压到手机指定的路径下面，起到覆盖更新的作用，话不多说进入正题：

FileDownloader.getImpl().create(url) .setPath(savePath) .setForceReDownload(true) .setListener(new FileDownloadListener() { @Override protected void pending(BaseDownloadTask task, int soFarBytes, int totalBytes) { }

                @Override
                protected void connected(BaseDownloadTask task, String etag, boolean isContinue, int soFarBytes, int totalBytes) {
                }

                @Override
                protected void progress(BaseDownloadTask task, int soFarBytes, int totalBytes) {
                    tvload.setText(soFarBytes+"/"+totalBytes);
                }

                @Override
                protected void blockComplete(BaseDownloadTask task) {
                }

                @Override
                protected void retry(final BaseDownloadTask task, final Throwable ex, final int retryingTimes, final int soFarBytes) {
                }

                @RequiresApi(api = Build.VERSION_CODES.N)
                @Override
                protected void completed(BaseDownloadTask task) {
                    tvload.setText("下载完成");
                    unPackage(savePath,Environment.getExternalStorageDirectory().getAbsolutePath() + "/com.game.rpg");
                }

                @Override
                protected void paused(BaseDownloadTask task, int soFarBytes, int totalBytes) {
                }

                @Override
                protected void error(BaseDownloadTask task, Throwable e) {
                }

                @Override
                protected void warn(BaseDownloadTask task) {
                }
            }).start();
            
            
             private void unPackage(String zipPath, String outputDir){
    try {
        ZipUtils.UnZipFolder(zipPath,outputDir);
    } catch (Exception e) {
        e.printStackTrace();
    }
}

  /**
 * 解压zip到指定的路径
 *
 * @param zipFileString ZIP的名称
 * @param outPathString 要解压缩路径
 */
@RequiresApi(api = Build.VERSION_CODES.N)
public static void UnZipFolder(String zipFileString, String outPathString) throws Exception {
    BufferedInputStream bi;
    ZipFile zf = new ZipFile(zipFileString, Charset.forName("GBK"));
    Enumeration e = zf.entries();
    while (e.hasMoreElements()) {
        ZipEntry ze2 = (ZipEntry) e.nextElement();
        String entryName = ze2.getName();
        String path = outPathString + "/" + entryName;
        if (ze2.isDirectory()) {
            System.out.println("正在创建解压目录 - " + entryName);
            File decompressDirFile = new File(path);
            if (!decompressDirFile.exists()) {
                decompressDirFile.mkdirs();
            }
        } else {
            System.out.println("正在创建解压文件 - " + entryName);
            String fileDir = path.substring(0, path.lastIndexOf("/"));
            File fileDirFile = new File(fileDir);
            if (!fileDirFile.exists()) {
                fileDirFile.mkdirs();
            }
            BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream(outPathString + "/" + entryName));
            bi = new BufferedInputStream(zf.getInputStream(ze2));
            byte[] readContent = new byte[1024];
            int readCount = bi.read(readContent);
            while (readCount != -1) {
                bos.write(readContent, 0, readCount);
                readCount = bi.read(readContent);
            }
            bos.close();
        }
    }
    zf.close();