Android二级列表

android中二级列表的显示与ListView、RecyelerView等步骤类似：

（1）xml布局

<ExpandableListView        android:id="@+id/expandablelistview"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:layout_marginTop="10dp" />

（2）代码：

private ExpandableListView expandablelistview;// 可扩展的二级列表//创建对象expandablelistview = (ExpandableListView) findViewById(R.id.expandablelistview);//实现二级列表的Group点击效果expandablelistview.setOnGroupClickListener(new OnGroupClickListener() {             @Override            public boolean onGroupClick(ExpandableListView parent, View v,                    int groupPosition, long id) {                if (!parent.isGroupExpanded(groupPosition)) {                    departmentId = (String) tree.get(groupArray                            .get(groupPosition));                getemployee(groupPosition);// 获取部门下的员工信息                    if (pos != groupPosition) {                        parent.collapseGroup(pos);                    }                    pos = groupPosition;                } else {                    parent.collapseGroup(groupPosition);                }                return true;            }        });   

（3）适配器：

public class ExpandableAdapter extends BaseExpandableListAdapter {         public ExpandableAdapter() {            hand = new Handler() {                 @Override                public void handleMessage(Message msg) {                    notifyDataSetChanged();                    super.handleMessage(msg);                }            };        }         public Object getChild(int groupPosition, int childPosition) {            if (childArray.size() == 0) {                return null;            }            return childArray.get(groupPosition).get(childPosition);        }         public long getChildId(int groupPosition, int childPosition) {            return childPosition;        }         public int getChildrenCount(int groupPosition) {            // if (childArray.size() == 0) {            // return 0;            // }            // if (childArray.size() == 1) {            // return 1;            // }            return childArray.size();        }         public View getChildView(int groupPosition, int childPosition,                boolean isLastChild, View convertView, ViewGroup parent) {            if (childArray.size() == 0) {                return getGenericView("无员工信息");            }            if (childArray.size() == 1) {                return getGenericViewchild(childArray.get(0).get(0));            }            String string = childArray.get(groupPosition).get(childPosition);            return getGenericViewchild(string);        }         // group method stub        public Object getGroup(int groupPosition) {            return groupArray.get(groupPosition);        }         public int getGroupCount() {            return groupArray.size();        }         public long getGroupId(int groupPosition) {            return groupPosition;        }         public View getGroupView(int groupPosition, boolean isExpanded,                View convertView, ViewGroup parent) {            String string = groupArray.get(groupPosition);            return getGenericView(string);        }         // View stub to create Group/Children 's View        public TextView getGenericView(String string) {            // Layout parameters for the ExpandableListView            AbsListView.LayoutParams layoutParams = new AbsListView.LayoutParams(                    ViewGroup.LayoutParams.FILL_PARENT,                    ViewGroup.LayoutParams.FILL_PARENT);            TextView text = new TextView(Manager_Employee_List.this);            text.setLayoutParams(layoutParams);            // Center the text vertically            text.setGravity(Gravity.CENTER_VERTICAL | Gravity.LEFT);            // Set the text starting position            text.setPadding(100, 0, 0, 0);            text.setTextSize(25);            text.setBackgroundResource(R.drawable.back_top);            text.setText(string);            return text;        }         public View getGenericViewchild(final String string) {            View v = View.inflate(Manager_Employee_List.this,                    R.layout.activity_baseadapter_list, null);            TextView text = (TextView) v.findViewById(R.id.tv_baseadapter_list);            ImageButton alter = (ImageButton) v                    .findViewById(R.id.ib_baseadapter_alter);            // 修改            alter.setOnClickListener(new OnClickListener() {                 @Override                public void onClick(View v) {                    Toast.makeText(getApplicationContext(), "修改", 0).show();                    Intent intent_Alter = new Intent(                            Manager_Employee_List.this, Manager_Add.class);                    intent_Alter.putExtra("companyId", companyId);                    PeopleNameAlter peopleNameAlter = (PeopleNameAlter) treeMap                            .get(string);                    intent_Alter.putExtra("biaoshi", true);                    intent_Alter.putExtra("banc", peopleNameAlter.banc);                    intent_Alter.putExtra("dapart", peopleNameAlter.dapart);                    intent_Alter.putExtra("id", peopleNameAlter.id);                    intent_Alter.putExtra("loginname",                            peopleNameAlter.loginname);                    intent_Alter.putExtra("phone", peopleNameAlter.phone);                    intent_Alter.putExtra("pwd", peopleNameAlter.pwd);                    intent_Alter.putExtra("name", string);                    startActivity(intent_Alter);                }            });            ImageButton delete = (ImageButton) v                    .findViewById(R.id.ib_baseadapter_delete);            // 删除            delete.setOnClickListener(new OnClickListener() {                 @Override                public void onClick(View v) {                    Toast.makeText(getApplicationContext(), "删除", 0).show();                    PeopleNameAlter peopleNameAlterDelete = (PeopleNameAlter) treeMap                            .get(string);                    deletePeople(peopleNameAlterDelete.id);                    namelingshi = string;                }            });            text.setText(string);            return v;        }         public boolean hasStableIds() {            return false;        }         public boolean isChildSelectable(int groupPosition, int childPosition) {            return true;        }     }

（4）让ExpandableListView使用适配器

expandablelistview.setAdapter(new ExpandableAdapter());

具体的显示效果，可以再适配器中进行设置。

本文出自 “移动平台开发” 博客，请务必保留此出处http://liuxudong1001.blog.51cto.com/10877072/1753742