013-一个Activity怎么调用另一个Activity的方法返回数据（转）

public class BaseActivity extends Activity {
    private static BaseActivity instance;
 
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_base);
        instance = this;
    }
 
    public static BaseActivity getInstance() {
        if (instance == null) {
            instance = new BaseActivity();
        }
        return instance;
    }
 
    public int login1() {
        return 1;
    }
    public static int login2() {
        return 2;
    }
}

public class MainActivity extends Activity {
 
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        BaseActivity.getInstance().login1();
        BaseActivity.login2();
    }
 
}