在Android上'On the fly‘解压文件

Question

我需要打包几个文件(总大小达4 GB )，这将在网上可用。android应用程序需要在不将存档文件保存到设备上的情况下‘即时’下载。因此，基本上设备不会保存存档，然后解包，因为这将需要两倍的空间。我应该选择哪种支持它的软件包格式(例如，zip、tar.gz等)？

Answer 1

使用.zip！您可以使用ZipInputStream和ZipOutputStream动态读取和写入.zip文件。不需要从归档文件中提取文件。

下面是一个简单的例子：

InputStream is =...
ZipInputStream zis = new ZipInputStream(new BufferedInputStream(is));
try {

    // ZipEntry contains data about files and folders in the archive.
    ZipEntry ze; 

    // This loops through the whole content of the archive
    while ((ze = zis.getNextEntry()) != null) {

        // Here we read the whole data of one ZipEntry
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        byte[] buffer = new byte[1024];
        int count;
        while ((count = zis.read(buffer)) != -1) {
            baos.write(buffer, 0, count);
        }

        // The ZipEntry contains data about the file, like its filename
        String filename = ze.getName();

        // And that's the file itself as byte array
        byte[] bytes = baos.toByteArray();

        // Do something with the file            
    }
} finally {
    zis.close();
}