在Android <2.0中获取主要的Gmail帐户用户名

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

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

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

        if (accounts.length > 0) {
            String email = accounts[0].name;
            String username = email.split("@")[0];
            System.out.println("主要的Gmail帐户用户名: " + username);
        } else {
            System.out.println("没有找到Gmail帐户");
        }
    }
}