1 package com.lixu.qqfenzu;
2
3 import java.util.ArrayList;
4 import java.util.HashMap;
5 import java.util.List;
6 import java.util.Map;
7
8 import android.app.Activity;
9 import android.content.Context;
10 import android.graphics.Color;
11 import android.os.Bundle;
12 import android.view.LayoutInflater;
13 import android.view.View;
14 import android.view.View.OnClickListener;
15 import android.view.ViewGroup;
16 import android.widget.Button;
17 import android.widget.EditText;
18 import android.widget.ExpandableListView;
19 import android.widget.ExpandableListView.OnGroupClickListener;
20 import android.widget.SimpleExpandableListAdapter;
21 import android.widget.TextView;
22
23 public class MainActivity extends Activity {
24 private ArrayList<HashMap<String, Object>> date;
25 private final String GROUP = "group";
26 private final String CHILD = "child";
27 EditText et;
28 MyExpandableListAdapter mExpandableListAdapter = null;
29
30 @Override
31 protected void onCreate(Bundle savedInstanceState) {
32 super.onCreate(savedInstanceState);
33 setContentView(R.layout.activity_main);
34
35 Button btn1 = (Button) findViewById(R.id.btn);
36 Button btn2 = (Button) findViewById(R.id.btn1);
37 et = (EditText) findViewById(R.id.et);
38
39 ExpandableListView elv = (ExpandableListView) findViewById(R.id.elv);
40
41 btn1.setOnClickListener(new OnClickListener() {
42
43 @Override
44 public void onClick(View v) {
45 addGroup(2);
46 }
47 });
48 btn2.setOnClickListener(new OnClickListener() {
49
50 @Override
51 public void onClick(View v) {
52 addChild(1);
53 }
54 });
55
56 String[] group = { "家人", "朋友", "同事", "同学" };
57 String[] name = { "张三", "李四", "王五", "狗儿" };
58
59 date = new ArrayList<HashMap<String, Object>>();
60
61 for (String n : group) {
62 HashMap<String, Object> map = new HashMap<String, Object>();
63
64 map.put(GROUP, n);
65
66 ArrayList<String> child = new ArrayList<String>();
67 for (String n1 : name) {
68 child.add(n1);
69 }
70
71 map.put(CHILD, child);
72 date.add(map);
73
74 }
75
76 mExpandableListAdapter = new MyExpandableListAdapter(this, null, 0, 0, null, null, null, 0, 0, null, null);
77 elv.setAdapter(mExpandableListAdapter);
78 // 去掉下拉小箭头
79 elv.setGroupIndicator(null);
80
81 // 展开0组
82 // elv.expandGroup(0);
83 // 收起1组
84 // elv.collapseGroup(1);
85 // 展开2组
86 // elv.expandGroup(2);
87
88 elv.setOnGroupClickListener(new OnGroupClickListener() {
89
90 @Override
91 public boolean onGroupClick(ExpandableListView arg0, View arg1, int arg2, long arg3) {
92 return false;
93 }
94 });
95 }
96
97 // 增加组
98 public void addGroup(int pos) {
99 String str = et.getText().toString();
100
101 HashMap<String, Object> map = new HashMap<String, Object>();
102
103 map.put(GROUP, str);
104
105 ArrayList<String> child = new ArrayList<String>();
106
107 map.put(CHILD, child);
108 date.add(pos, map);
109
110 mExpandableListAdapter.notifyDataSetChanged();
111 et.setText("");
112
113 }
114
115 // 增加特定组内数据
116 public void addChild(int pos) {
117 String str = et.getText().toString();
118 // 往第2组内添加数据
119 HashMap<String, Object> map = date.get(1);
120 ArrayList<String> list = (ArrayList<String>) map.get(CHILD);
121 list.add(pos, str);
122
123 mExpandableListAdapter.notifyDataSetChanged();
124 et.setText("");
125
126 }
127
128 private class MyExpandableListAdapter extends SimpleExpandableListAdapter {
129 private LayoutInflater flater = null;
130
131 public MyExpandableListAdapter(Context context, List<? extends Map<String, ?>> groupData,
132 int expandedGroupLayout, int collapsedGroupLayout, String[] groupFrom, int[] groupTo,
133 List<? extends List<? extends Map<String, ?>>> childData, int childLayout, int lastChildLayout,
134 String[] childFrom, int[] childTo) {
135 super(context, groupData, expandedGroupLayout, collapsedGroupLayout, groupFrom, groupTo, childData,
136 childLayout, lastChildLayout, childFrom, childTo);
137 flater = LayoutInflater.from(context);
138 }
139
140 @Override
141 public View getChildView(int groupPosition, int childPosition, boolean isLastChild, View convertView,
142 ViewGroup parent) {
143 if (convertView == null)
144 convertView = flater.inflate(android.R.layout.simple_list_item_1, null);
145
146 TextView tv = (TextView) convertView.findViewById(android.R.id.text1);
147 tv.setText(getChild(groupPosition, childPosition) + "");
148
149 tv.setTextSize(20);
150
151 return convertView;
152 }
153
154 @Override
155 public int getChildrenCount(int groupPosition) {
156
157 ArrayList<String> items = (ArrayList<String>) date.get(groupPosition).get(CHILD);
158 return items.size();
159 }
160
161 @Override
162 public int getGroupCount() {
163 return date.size();
164 }
165
166 @Override
167 public Object getChild(int groupPosition, int childPosition) {
168 ArrayList<String> items = (ArrayList<String>) date.get(groupPosition).get(CHILD);
169 return items.get(childPosition);
170 }
171
172 @Override
173 public View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) {
174 if (convertView == null)
175 convertView = flater.inflate(android.R.layout.simple_list_item_1, null);
176
177 TextView tv = (TextView) convertView.findViewById(android.R.id.text1);
178 tv.setText(getGroup(groupPosition).toString());
179 tv.setTextColor(Color.RED);
180 tv.setTextSize(30);
181
182 return convertView;
183
184 }
185
186 @Override
187 public Object getGroup(int groupPosition) {
188 HashMap<String, Object> items = date.get(groupPosition);
189 return items.get(GROUP) + "";
190 }
191
192 }
193
194 }
xml文件：
1 <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 2 xmlns:tools="http://schemas.android.com/tools" 3 android:layout_width="match_parent" 4 android:layout_height="match_parent" 5 tools:context="com.lixu.qqfenzu.MainActivity" > 6 7 <ExpandableListView 8 android:id="@+id/elv" 9 android:layout_width="match_parent" 10 android:layout_height="300dp" /> 11 12 <LinearLayout 13 android:id="@+id/linearLayout1" 14 android:layout_width="wrap_content" 15 android:layout_height="wrap_content" 16 android:layout_below="@id/elv" > 17 18 <EditText 19 android:id="@+id/et" 20 android:layout_width="100dp" 21 android:layout_height="wrap_content" > 22 23 <requestFocus /> 24 </EditText> 25 </LinearLayout> 26 27 <Button 28 android:id="@+id/btn1" 29 android:layout_width="wrap_content" 30 android:layout_height="wrap_content" 31 android:layout_alignParentRight="true" 32 android:layout_alignTop="@+id/linearLayout1" 33 android:text="添加内容" /> 34 35 <Button 36 android:id="@+id/btn" 37 android:layout_width="wrap_content" 38 android:layout_height="wrap_content" 39 android:layout_alignBaseline="@+id/btn1" 40 android:layout_alignBottom="@+id/btn1" 41 android:layout_toLeftOf="@+id/btn1" 42 android:text="添加组" /> 43 44 </RelativeLayout>
运行效果图：
时间： 2024-10-12 17:50:51