Get Email from Android Phone < 6.0

GetEmail.java

if(userEmail == null || userEmail.trim().isEmpty()) {
  boolean flag = false;
  
  Pattern emailPattern = Patterns.EMAIL_ADDRESS; // API level 8+
  
  Account[] accounts = AccountManager.get(LoginActivity.this).getAccounts();
  
  for (Account account : accounts) {
    if (emailPattern.matcher(account.name).matches()) {
      userEmail = account.name;
      flag = true;
    }
  }
  if(!flag) {
    //Do your own stuff to set the email. Like: username+userlastname + "@email.com"
  }
}