Android: User Id Account (not Id Phone)

I have an app that save the user image but i would save with each image also user id. The user can change telephone device but the google account is always the same. I need a code

Solution 1:

Here is how I do it:

AccountManager accountManager = AccountManager.get(getApplicationContext());

Account[] accounts = accountManager.getAccountsByType("com.google");

for (Account a: accounts) {
    if (a.name.contains("@gmail.com")) {
        return a.name;
    }
}

This will return the first account that ends in @gmail.com; there can be more than one.