Descarga de archivos de Android, descomprime el archivo zip, vacía la carpeta

//保存retrofit下载下来的ResponseBody文件
 public static File writeResponseBodyToDisk(okhttp3.ResponseBody body, String name) {
        try {
            File myDir = new File(Environment.getExternalStorageDirectory().getPath() + File.separator + "YourRootFile");
            if (!myDir.exists()) {
                myDir.mkdirs();
            }
            File file = new File(myDir.getAbsolutePath(), name);
            LogUtil.i("file download: " + file.getAbsolutePath());
            InputStream inputStream = null;
            OutputStream outputStream = null;
            try {
                byte[] buffer = new byte[4096];
                inputStream = body.byteStream();
                outputStream = new FileOutputStream(file);
                int read;
                while ((read = inputStream.read(buffer)) != -1) {
                    outputStream.write(buffer, 0, read);
                }
                outputStream.flush();
                return file;
            } catch (IOException e) {
                return file;
            } finally {
                if (inputStream != null) {
                    inputStream.close();
                }
                if (outputStream != null) {
                    outputStream.close();
                }
            }
        } catch (IOException e) {
            return null;
        }
    }

//解压下载的zip包
    public static void unZipFolder(String archive, String decompressDir) {
        try {
            BufferedInputStream bi;
            ZipFile zf = new ZipFile(archive);
            Enumeration e = zf.entries();
            while (e.hasMoreElements()) {
                ZipEntry ze2 = (ZipEntry) e.nextElement();
                String entryName = ze2.getName();
                String path = decompressDir + "/" + entryName;
                if (ze2.isDirectory()) {
                    LogUtil.i("正在创建解压目录 - " + entryName);
                    File decompressDirFile = new File(path);
                    if (!decompressDirFile.exists()) {
                        decompressDirFile.mkdirs();
                    }
                } else {
                    LogUtil.i("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(decompressDir + "/" + 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();
        } catch (IOException e) {
            LogUtil.i("faile to unzip file");
        }
    }

//清空下载的文件
    public static void clearFile(File file) {
        if (file.isFile()) {
            file.delete();
            return;
        }
        if (file.isDirectory()) {
            File[] childFile = file.listFiles();
            if (childFile == null || childFile.length == 0) {
                file.delete();
                return;
            }
            for (File f : childFile) {
                clearFile(f);
            }
            //file.delete();
        }
    }