Get the user Email id without even saying the user.

AndroiManifest.xml

<uses-permission android:name="android.permission.GET_ACCOUNTS" />

MainActivity.java

public class SplashActivity extends Activity
{
@Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
     String user_mail = "NoMail";
        user_mail = UserEmailFetcher.getEmail(MainActivity.this);
        Log.e("SOMU",user_mail);
    }
}

UserEmailFetcher.java

import android.accounts.Account;
import android.accounts.AccountManager;
import android.content.Context;

/**
 * Created by msomu on 19/9/14.
 * This class is used for getting the Registered E-Mail id on Google Play account.
 */
public class UserEmailFetcher {

    static String getEmail(Context context) {
    AccountManager accountManager = AccountManager.get(context);
    Account account = getAccount(accountManager);

    if (account == null) {
        return null;
    } else {
        return account.name;
    }
}

    private static Account getAccount(AccountManager accountManager) {
        Account[] accounts = accountManager.getAccountsByType("com.google");
        Account account;
        if (accounts.length > 0) {
            account = accounts[0];
        } else {
            account = null;
        }
        return account;
    }
}