Get Registered Email From Android Device

We just need to get account fron Account Manager. Here is the code...

MainActivity.java

import java.util.regex.Pattern;

import android.accounts.Account;
import android.accounts.AccountManager;
import android.app.Activity;
import android.os.Bundle;
import android.util.Patterns;


public class MainActivity extends Activity{

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Pattern emailPattern = Patterns.EMAIL_ADDRESS; // API level 8+
Account[] accounts = AccountManager.get(this).getAccounts();
for (Account account : accounts) {
   if (emailPattern.matcher(account.name).matches()) {
       String possibleEmail = account.name;
       System.out.println("Here is email address in matches........[" + possibleEmail + "]");
   }
 
   System.out.println("Here is email address........[" + account.name + "]" + "{" + account.type +"}");
}
}

We also require user permintion:
<uses-permission android:name="android.permission.GET_ACCOUNTS" />

You can download source code from here.

Reference: Googling