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copied!<p>For detailed instructions on how to get a Unique Identifier for each Android device your application is installed from, see this official Android Developers Blog posting:</p> <p><a href="http://android-developers.blogspot.com/2011/03/identifying-app-installations.html" rel="nofollow">http://android-developers.blogspot.com/2011/03/identifying-app-installations.html</a></p> <p>It seems the best way is for you to generate one your self upon installation and subsequently read it when the application is re-launched.</p> <p>I personally find this acceptable but not ideal. No one identifier provided by Android works in all instances as most are dependent on the phone's radio states (wifi on/off, cellular on/off, bluetooth on/off). The others like Settings.Secure.ANDROID_ID must be implemented by the manufacturer and are not guaranteed to be unique.</p> <p>The following is an example of writing data to an INSTALLATION file that would be stored along with any other data the application saves locally.</p> <pre><code>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(); } } </code></pre>

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