Installtion ID : UUID 统计安装

来源：互联网发布：电路板设计软件下载编辑：程序博客网时间：2024/05/20 22:03

public class Installation {    private static String sID = null;    private static final String INSTALLATION = "INSTALLATION";    public synchronized static String id(Context context) {        if (sID == null) {              File installation = new File(context.getFilesDir(), INSTALLATION);            try {                if (!installation.exists())                    writeInstallationFile(installation);                sID = readInstallationFile(installation);            } catch (Exception e) {                throw new RuntimeException(e);            }        }        return sID;    }    private static String readInstallationFile(File installation) throws IOException {        RandomAccessFile f = new RandomAccessFile(installation, "r");        byte[] bytes = new byte[(int) f.length()];        f.readFully(bytes);        f.close();        return new String(bytes);    }    private static void writeInstallationFile(File installation) throws IOException {        FileOutputStream out = new FileOutputStream(installation);        String id = UUID.randomUUID().toString();        out.write(id.getBytes());        out.close();    }}

0 0