cristallumpkin419

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> UltimateAndroid > > Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.support.v4.widget.DrawerLayout.setDrawerListener(android.support.v4.widget.DrawerLayout$DrawerListener)' on a null object reference > > 解决方法 > 添加V4包 > DemoOfUI\libs\android-support-v4.jar ### dam > -...