Here you can find the source of get_device_id(Context ctx)
public static String get_device_id(Context ctx)
//package com.java2s; import android.content.Context; import android.telephony.TelephonyManager; import java.security.MessageDigest; import java.util.UUID; public class Main { public static String get_device_id(Context ctx) { final TelephonyManager tm = (TelephonyManager) ctx .getSystemService(Context.TELEPHONY_SERVICE); String tmDevice;//from www . ja v a 2s . c o m String tmSerial = null; String androidId = null; tmDevice = "krakenmessages"; try { tmDevice = "" + tm.getDeviceId(); } catch (Exception ex) { } try { tmSerial = "" + tm.getSimSerialNumber(); } catch (Exception ex) { } try { androidId = "" + android.provider.Settings.Secure.getString( ctx.getContentResolver(), android.provider.Settings.Secure.ANDROID_ID); } catch (Exception ex) { } try { UUID deviceUuid = new UUID(androidId.hashCode(), ((long) tmDevice.hashCode() << 32) | tmSerial.hashCode()); String deviceId = deviceUuid.toString(); MessageDigest md = MessageDigest.getInstance("SHA-256"); md.update(deviceId.getBytes()); byte byteData[] = md.digest(); //convert the byte to hex format method 1 StringBuffer sb = new StringBuffer(); for (int i = 0; i < byteData.length; i++) { sb.append(Integer .toString((byteData[i] & 0xff) + 0x100, 16) .substring(1)); } deviceId = sb.toString(); return deviceId; } catch (Exception ex) { } return "nodeviceid"; } }