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权限和声明<uses-permission android:name="android.permission.INTERNET"/> <activity android:name=".view.ShoppingCartActivity"></activity>导入jar包 compile 'com.android.support.constraint:constraint-layout:1.0.2'

Adapter public class MyExpandableAdapter extends BaseExpandableListAdapter { private List groupdata; private Context context; private List> childlist; public MyExpandableAda