Android 二级列表

请求网络数据二级列表的GitHub地址：点击打开链接 
https://github.com/zhouxua/Erji_liebiao

//适配器

public class MyExpandableListView extends BaseExpandableListAdapter {    private Context context;    private LayoutInflater inflater;    public MyExpandableListView(Context context){        this.context = context;        inflater = (LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);    }    private String[] groups = {"A", "B", "C"};    //注意，字符数组不要写成{{"A1,A2,A3,A4"}, {"B1,B2,B3,B4，B5"}, {"C1,C2,C3,C4"}}*/    private String[][] childs={{"A1","A2","A3","A4"},{"A1","A2","A3", "B4"},{"A1","A2","A3","C4"}};    //返回一级列表的个数    @Override    public int getGroupCount() {        return groups.length;    }    //返回每个二级列表的个数    @Override    public int getChildrenCount(int groupPosition) { //参数groupPosition表示第几个一级列表        Log.d("smyhvae", "-->" + groupPosition);        return childs[groupPosition].length;    }    //返回一级列表的单个item（返回的是对象）    @Override    public Object getGroup(int groupPosition) {        return groups[groupPosition];    }    //返回二级列表中的单个item（返回的是对象）    @Override    public Object getChild(int groupPosition, int childPosition) {        return childs[groupPosition][childPosition];  //不要误写成groups[groupPosition][childPosition]    }    @Override    public long getGroupId(int groupPosition) {        return groupPosition;    }    @Override    public long getChildId(int groupPosition, int childPosition) {        return childPosition;    }    //每个item的id是否是固定？一般为true    @Override    public boolean hasStableIds() {        return true;    }    //【重要】填充一级列表    @Override    public View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) {        if (convertView == null) {            convertView = inflater.inflate(R.layout.item_group, null);        }        TextView tv_group = (TextView) convertView.findViewById(R.id.tv_group);        tv_group.setText(groups[groupPosition]);        return convertView;    }    //【重要】填充二级列表    @Override    public View getChildView(int groupPosition, int childPosition, boolean isLastChild, View convertView, ViewGroup parent) {        if (convertView == null) {            convertView = inflater.inflate(R.layout.item_child, null);        }        ImageView iv_child = (ImageView) convertView.findViewById(R.id.iv_child);        TextView tv_child = (TextView) convertView.findViewById(R.id.tv_child);        //iv_child.setImageResource(resId);        tv_child.setText(childs[groupPosition][childPosition]);        return convertView;    }    //二级列表中的item是否能够被选中？可以改为true    @Override    public boolean isChildSelectable(int groupPosition, int childPosition) {        return true;    }}

//mainactivity中

public class MainActivity extends AppCompatActivity {    //View    private ExpandableListView expandableListView;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        expandableListView = (ExpandableListView) findViewById(R.id.expandableListView);        expandableListView.setAdapter(new MyExpandableListView(MainActivity.this));    }}