Is Secure ANDROID ID unique for each device

Question

I am using this call   Secure getString getApplicationContext   getContentResolver    Secure ANDROID ID     To get a UID for the device  I think I am getting the same ID from multiple devices though  Should this be possible    The ID in question is  9774d56d682e549c and apparently there is an issue with several devices returning this ID http   code google com p android issues list cursor 10603 amp updated 10603 amp ts 1295993403

User · Answer

Fields String myID  int myversion   0    myversion   Integer valueOf android os Build VERSION SDK   if  myversion  lt  23            TelephonyManager mngr    TelephonyManager   getSystemService Context TELEPHONY SERVICE           myID  mngr getDeviceId              else               myID    Settings Secure getString getApplicationContext   getContentResolver     Settings Secure ANDROID ID           Yes  Secure ANDROID ID is unique for each device

User · Answer

I ve read a few things about this and unfortunately the ANDROID ID should not be relied on for uniquely identifying an individual device   It doesn t seem to be enforced in Android compliance requirements and so manufacturers seem to implement it the way they choose including some using it more as a  model  ID etc   Also  be aware that even if a manufacturer has written a generator to make it a UUID  for example   it s not guaranteed to survive a factory reset

User · Answer

So if you want something unique to the device itself  TM getDeviceId   should be sufficient    Here is the code which shows how to get Telephony manager ID  The android Device ID that you are using can change on factory settings and also some manufacturers have issue in giving unique id   TelephonyManager tm             TelephonyManager  this getSystemService Context TELEPHONY SERVICE   String androidId   Secure getString this getContentResolver    Secure ANDROID ID   Log d  ID    Android ID      androidId   Log d  ID    Device ID       tm getDeviceId       Be sure to take permissions for TelephonyManager by using   lt uses-permission android name  android permission READ PHONE STATE    gt

User · Answer

Just list an alternaitve solution here  the Advertising ID   https   support google com googleplay android-developer answer 6048248 hl en  Copied from the link above   The advertising ID is a unique  user-resettable ID for advertising  provided by Google Play services  It gives users better controls and provides developers with a simple  standard system to continue to monetize their apps  It enables users to reset their identifier or opt out of personalized ads  formerly known as interest-based ads  within Google Play apps   The limitations are    Google Play enabled devices only  Privacy Policy  https   support google com googleplay android-developer answer 113469 hl en amp rd 1 privacy

User · Answer

With Android O the behaviour of the ANDROID ID will change  The ANDROID ID will be different per app per user on the phone   Taken from  https   android-developers googleblog com 2017 04 changes-to-device-identifiers-in html  Android ID  In O  Android ID  Settings Secure ANDROID ID or SSAID  has a different value for each app and each user on the device  Developers requiring a device-scoped identifier  should instead use a resettable identifier  such as Advertising ID  giving users more control  Advertising ID also provides a user-facing setting to limit ad tracking    Additionally in Android O     The ANDROID ID value won t change on package uninstall reinstall  as long as the package name and signing key are the same  Apps can rely on this value to maintain state across reinstalls   If an app was installed on a device running an earlier version of Android  the Android ID remains the same when the device is updated to Android O  unless the app is uninstalled and reinstalled   The Android ID value only changes if the device is factory reset or if the signing key rotates between uninstall and reinstall events   This change is only required for device manufacturers shipping with Google Play services and Advertising ID  Other device manufacturers may provide an alternative resettable ID or continue to provide ANDROID ID

User · Answer

Check into this thread    However you should be careful as it s documented as  can change upon factory reset   Use at your own risk  and it can be easily changed on a rooted phone   Also it appears as if some manufacturers have had issues with their phones having duplicate numbers thread   Depending on what your trying to do  I probably wouldnt use this as a UID

User · Answer

There are multiple solution exist but none of them perfect  let s go one by one  1  Unique Telephony Number  IMEI  MEID  ESN  IMSI   This solution needs to request for android permission READ PHONE STATE to your user which can be hard to justify following the type of application you have made   Furthermore  this solution is limited to smartphones because tablets don   t have telephony services  One advantage is that the value survives to factory resets on devices    2  MAC Address  You can also try to get a MAC Address from a device having a Wi-Fi or Bluetooth hardware  But  this solution is not recommended because not all of the device have Wi-Fi connection  Even if the user have a Wi-Fi connection  it must be turned on to retrieve the data  Otherwise  the call doesn   t report the MAC Address   3  Serial Number  Devices without telephony services like tablets must report a unique device ID that is available via android os Build SERIAL since Android 2 3 Gingerbread  Some phones having telephony services can also define a serial number  Like not all Android devices have a Serial Number  this solution is not reliable   4  Secure Android ID  On a device first boot  a randomly value is generated and stored  This value is available via Settings Secure ANDROID ID   It   s a 64-bit number that should remain constant for the lifetime of a device  ANDROID ID seems a good choice for a unique device identifier because it   s available for smartphones and tablets  String androidId   Settings Secure getString getContentResolver   Settings Secure ANDROID ID     However  the value may change if a factory reset is performed on the device  There is also a known bug with a popular handset from a manufacturer where every instance have the same ANDROID ID  Clearly  the solution is not 100  reliable    5  Use UUID  As the requirement for most of applications is to identify a particular installation and not a physical device  a good solution to get unique id for an user if to use UUID class  The following solution has been presented by Reto Meier from Google in a Google I O presentation   private static String uniqueID   null  private static final String PREF UNIQUE ID    quot PREF UNIQUE ID quot   public synchronized static String id Context context       if  uniqueID    null           SharedPreferences sharedPrefs   context getSharedPreferences                 PREF UNIQUE ID  Context MODE PRIVATE          uniqueID   sharedPrefs getString PREF UNIQUE ID  null          if  uniqueID    null               uniqueID   UUID randomUUID   toString               Editor editor   sharedPrefs edit               editor putString PREF UNIQUE ID  uniqueID              editor commit                     return uniqueID       Identify a particular device on Android is not an easy thing  There are many good reasons to avoid that  Best solution is probably to identify a particular installation by using UUID solution  credit   blog

[android] Is Secure.ANDROID_ID unique for each device?

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