What should the Android device ID length be

android udid
SampathKumar picture SampathKumar · Jul 20, 2012 · Viewed 24.5k times · Source

Can anybody please tell me the length for device UDID in Android, because I got the UDID in android and it is only 16 characters, but the iPhone UDID length is 40.

I am using the following code to detect the ID:

id = android.provider.Settings.System.getString(super.getContentResolver(),
    android.provider.Settings.Secure.ANDROID_ID);

Answer

mschwaig picture mschwaig · Feb 8, 2018

The Android ID is

UP TO 16 characters long

since leading zeroes are not pretended at least in some versions of Android that appear in the wild. Take a look at this answer to a similar question for why that is: https://stackoverflow.com/a/29890124/2066744

The docs specify it as a 64-bit number (expressed as a hexadecimal string) here: https://developer.android.com/reference/android/provider/Settings.Secure.html#ANDROID_ID

Related questions

Android UDID like IPhone?

Does Android have a UDID like IPhone? If yes, is there a way I can get it programatically? Thanks Chris

Read More
UDID or IMEI- which is better?

When developing an app that requires me to uniquely identify phone users. I was hoping for some advice on whether it is best to use a phone's UDID or IMEI. Are there any advantages/disadvantages to using either. All comments …

Read More
How OpenUDID works

Do you know how OpenUDID generate unique device ID? Is there any chance that 2 devices having the same OpenUDID value? EDIT 1: Will the OpenUDID change when the device is reset? EDIT 2: If collision is possible, is there any alternative for …

Read More