public static boolean verifyInstallPackage(String packagePath, String crc) {
    try {
        MessageDigest sig = MessageDigest.getInstance("MD5");
        File packageFile = new File(packagePath);
        InputStream signedData = new FileInputStream(packageFile);
        byte[] buffer = new byte[4096];//每次检验的文件区大小
        long toRead = packageFile.length();
        long soFar = 0;
        boolean interrupted = false;
        while (soFar < toRead) {
            interrupted = Thread.interrupted();
            if (interrupted) break;
            int read = signedData.read(buffer);
            soFar += read;
            sig.update(buffer, 0, read);
        }
        byte[] digest = sig.digest();
        String digestStr = bytesToHexString(digest);//将得到的MD5值进行移位转换
        digestStr = digestStr.toLowerCase();
        crc = crc.toLowerCase();
        if (digestStr.equals(crc)) {//比较两个文件的MD5值，如果一样则返回true
            return true;
        }

    } catch (Exception e) {
        // TODO: handle exception
        return false;
    }
    return false;
}

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