找不到 class 'android.support.v4.widget.DrawerLayout',

Could not find class 'android.support.v4.widget.DrawerLayout',

Could not find class 'android.support.v4.widget.DrawerLayout', referenced from method com.example.slid.MainActivity.onCreate

我无法解决这个问题,我的库已更新。

class 在 support-v4support-v13 库中 the Android Support package