仿QQ分组折叠菜单ExpandableListView

来源：互联网发布：钉钉阿里云code机器人编辑：程序博客网时间：2024/05/16 17:27


public class MainActivity extends AppCompatActivity {    private ExpandableListView el_list;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        final String items[] = new String[]{"one", "two", "three","four","five"};        final Map<String, List<String>> map = new HashMap<String, List<String>>();        List<String> list1 = new ArrayList<>();        List<String> list2 = new ArrayList<>();        List<String> list3 = new ArrayList<>();        List<String> list4 = new ArrayList<>();        List<String> list5 = new ArrayList<>();        list1.add("一");        list1.add("二");        list1.add("三");        list2.add("四");        list2.add("五");        list2.add("六");        list3.add("七");        list3.add("八");        list3.add("九");        list4.add("十");        list4.add("十一");        list4.add("十二");        list5.add("十三");        list5.add("十四");        list5.add("十五");        map.put(items[0], list1);        map.put(items[1], list2);        map.put(items[2], list3);        map.put(items[3], list4);        map.put(items[4], list5);        el_list = findViewById(R.id.el_list);        el_list.setAdapter(new MyAdapter(this,map,items));        el_list.setOnChildClickListener(new ExpandableListView.OnChildClickListener() {            @Override            public boolean onChildClick(ExpandableListView expandableListView, View view, int i, int i1, long l) {                Toast.makeText(MainActivity.this,map.get(items[i]).get(i1),Toast.LENGTH_LONG);                return true;            }        });    }    public class MyAdapter extends BaseExpandableListAdapter {        private final Map<String, List<String>> mMap;        private final String[] mIems;        public MyAdapter(Context context, Map<String, List<String>> map, String[] items) {            mMap = map;            mIems = items;        }        //  获得父项的数量        @Override        public int getGroupCount() {            return mMap.size();        }        //  获得某个父项的子项数目        @Override        public int getChildrenCount(int i) {            return mMap.get(mIems[i]).size();        }        //  获得某个父项        @Override        public Object getGroup(int i) {            return mMap.get(mIems[i]);        }        //  获得某个父项的某个子项        @Override        public Object getChild(int i, int i1) {            return mMap.get(mIems[i]).get(i1);        }        //  获得某个父项的id        @Override        public long getGroupId(int i) {            return 0;        }        //  获得某个父项的某个子项的id        @Override        public long getChildId(int i, int i1) {            return 0;        }        //  按函数的名字来理解应该是是否具有稳定的id，这个方法目前一直都是返回false，没有去改动过        @Override        public boolean hasStableIds() {            return false;        }        //  获得父项显示的view        @Override        public View getGroupView(int i, boolean b, View view, ViewGroup viewGroup) {            view = LayoutInflater.from(MainActivity.this).inflate(R.layout.item_parent, null);            TextView tv_1 = view.findViewById(R.id.tv_parent);            tv_1.setText(mIems[i]);            return view;        }        //  获得子项显示的view        @Override        public View getChildView(int i, int i1, boolean b, View view, ViewGroup viewGroup) {            view = LayoutInflater.from(MainActivity.this).inflate(R.layout.item_child, null);            TextView tv_child = view.findViewById(R.id.tv_child);            tv_child.setText(mMap.get(mIems[i]).get(i1));            tv_child.setOnClickListener(new View.OnClickListener() {                @Override                public void onClick(View view) {                    Toast.makeText(MainActivity.this,"点击子条目",Toast.LENGTH_LONG).show();                }            });            return view;        }        //  子项是否可选中，如果需要设置子项的点击事件，需要返回true        @Override        public boolean isChildSelectable(int i, int i1) {            return true;        }    }}
主界面布局
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    tools:context="cn.qun.expandablelistview.MainActivity">    <ExpandableListView        android:id="@+id/el_list"        android:layout_width="match_parent"        android:layout_height="wrap_content"/></LinearLayout>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="match_parent">    <TextView        android:id="@+id/tv_parent"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:gravity="center"        android:layout_marginBottom="5dp"        android:layout_marginTop="5dp"        android:textColor="#f00"        android:textSize="20sp" /></LinearLayout>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="match_parent">    <TextView        android:id="@+id/tv_child"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:gravity="center"        android:textColor="#000"        android:textSize="20sp"/></LinearLayout>
阅读全文
0 0