Android中ExpandableListView中嵌套ListView
16lz
2021-01-25
最近项目挺紧张，一直没有时间总结学习，今天把最近遇到的一个奇葩的设计，做一下总结。其他的好多的APP中做的通讯录都类似微信通讯录这样，但是有这样一个需求的设计。
就是分为两个组，第一个组不需要A-Z的索引，第二组需要A-Z的索引。以下是我的实现思路。
1.实现思路
1.写布局文件，将ExpandableListView添加到布局文件。
2.写MyExpandableListViewAdapter的实现
3.ListView设置为不可滑动。
4.再第一组中，添加一个ListView，第二个组中，添加一个ListView根据用户名的拼音实现A-Z的排序展示。
2.代码的实现
2.1 主文件布局文件
"http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:paddingBottom="@dimen/activity_vertical_margin" android:paddingLeft="@dimen/activity_horizontal_margin" android:paddingRight="@dimen/activity_horizontal_margin" android:paddingTop="@dimen/activity_vertical_margin" tools:context=".view.ExtenpListViewActivity"> "match_parent" android:layout_height="match_parent" android:id="@+id/elv_good_friend" android:layout_alignParentLeft="true" android:layout_alignParentStart="true" android:layout_alignParentTop="true" /></RelativeLayout> 2.2 MyExpandableListViewAdapter的实现
/** *@类名 : ExtenpListViewActivity *@描述 : *@时间 : 2016/4/12 13:56 *@作者: 李东 *@邮箱 : lidong@chni.com.cn *@company: chni */ private class MyExpandableListViewAdapter extends BaseExpandableListAdapter{ public MyExpandableListViewAdapter(Context context) { this.context = context; } private Context context; @Override public int getGroupCount() { return mGroup.length; } @Override public int getChildrenCount(int groupPosition) { return 1;//注意返回值必须为1，不然会重复 } @Override public Object getGroup(int groupPosition) { return mGroup[groupPosition] ; } @Override public Object getChild(int groupPosition, int childPosition) { return mGroupData[groupPosition][childPosition]; } @Override public long getGroupId(int groupPosition) { return groupPosition; } @Override public long getChildId(int groupPosition, int childPosition) { int count = 0; count = mGroupData[groupPosition].length; return count; } @Override public boolean hasStableIds() { return false; } @Override public View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) { TextView text = (TextView) View.inflate(context, android.R.layout.simple_expandable_list_item_1, null); text.setText(mGroup[groupPosition]); return text; } @Override public View getChildView(final int groupPosition, final int childPosition, boolean isLastChild, View convertView, ViewGroup parent) { if (groupPosition==0){ SubListView lv = (SubListView) View.inflate(context, R.layout.item_expend_listview, null); final List mSourceDateList = mMap.get("我的好友"); ListViewAdaAdapter1 listViewAdaAdapter = new ListViewAdaAdapter1(mSourceDateList, context); lv.setAdapter(listViewAdaAdapter); lv.setOnItemClickListener(new AdapterView.OnItemClickListener() { @Override public void onItemClick(AdapterView<?> parent, View view, int position, long id) { Toast.makeText(ExtenpListViewActivity.this, mSourceDateList.get(position).getName(),Toast.LENGTH_SHORT).show(); } }); return lv; }else{ SubListView lv = (SubListView) View.inflate(context, R.layout.item_expend_listview, null); final List mSourceDateList = mMap.get("我的关注"); Log.d(TAG, "mSourceDateList: " + mSourceDateList.size()); List SourceDateList = new ArrayList<>(); Log.d(TAG, "getChildView() called with: " + "groupPosition = [" + groupPosition + "], childPosition = [" + childPosition + "], convertView = [" + convertView + "],数据" + mSourceDateList.size()); SourceDateList= filledData(mSourceDateList); // 根据a-z进行排序源数据 Collections.sort(SourceDateList, pinyinComparator); ListViewAdaAdapter listViewAdaAdapter = new ListViewAdaAdapter(SourceDateList, context); lv.setAdapter(listViewAdaAdapter); final List finalSourceDateList = SourceDateList; lv.setOnItemClickListener(new AdapterView.OnItemClickListener() { @Override public void onItemClick(AdapterView<?> parent, View view, int position, long id) { Toast.makeText(ExtenpListViewActivity.this, finalSourceDateList.get(position).getName(),Toast.LENGTH_SHORT).show(); } }); return lv; } } @Override public boolean isChildSelectable(int groupPosition, int childPosition) { return false; } } 注意：在这里做的过程遇到一个坑，就是ListView的元素的重复，最后百度查了一下，需要做如下设置：
@Override public int getChildrenCount(int groupPosition) { return 1;//注意返回值必须为1，不然会重复 }2.3 ListView设置为不可滑动
package com.lidong.demo.view;import android.content.Context;import android.util.AttributeSet;import android.widget.ListView;/***@类名 : SubListView*@描述 : *@时间 : 2016/4/12 14:54*@作者: 李东*@邮箱 : lidong@chni.com.cn*@company: chni*/public class SubListView extends ListView { public SubListView(Context context, AttributeSet attrs) { super(context, attrs); } public void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { int expandSpec = MeasureSpec.makeMeasureSpec(Integer.MAX_VALUE >> 2, MeasureSpec.AT_MOST); super.onMeasure(widthMeasureSpec, expandSpec); }}2.4 PinyinComparator 拼音比较方法
package com.lidong.demo.view.fragment;import java.util.Comparator;/** * Created by lidongon 2016/4/12. */public class PinyinComparator implements Comparator<Friend> { public static PinyinComparator instance = null; public static PinyinComparator getInstance() { if (instance == null) { instance = new PinyinComparator(); } return instance; } public int compare(Friend o1, Friend o2) { if (o1.getLetters().equals("@") || o2.getLetters().equals("#")) { return -1; } else if (o1.getLetters().equals("#") || o2.getLetters().equals("@")) { return 1; } else { return o1.getLetters().compareTo(o2.getLetters()); } }}2.5 Java汉字转换为拼音
/* * Filename CharacterParser.java * Company Chni * @author lidong * @version 0.1 */package com.lidong.demo.view.fragment;/** * Java汉字转换为拼音 * */public class CharacterParser { private static int[] pyvalue = new int[] { -20319, -20317, -20304, -20295, -20292, -20283, -20265, -20257, -20242, -20230, -20051, -20036, -20032, -20026, -20002, -19990, -19986, -19982, -19976, -19805, -19784, -19775, -19774, -19763, -19756, -19751, -19746, -19741, -19739, -19728, -19725, -19715, -19540, -19531, -19525, -19515, -19500, -19484, -19479, -19467, -19289, -19288, -19281, -19275, -19270, -19263, -19261, -19249, -19243, -19242, -19238, -19235, -19227, -19224, -19218, -19212, -19038, -19023, -19018, -19006, -19003, -18996, -18977, -18961, -18952, -18783, -18774, -18773, -18763, -18756, -18741, -18735, -18731, -18722, -18710, -18697, -18696, -18526, -18518, -18501, -18490, -18478, -18463, -18448, -18447, -18446, -18239, -18237, -18231, -18220, -18211, -18201, -18184, -18183, -18181, -18012, -17997, -17988, -17970, -17964, -17961, -17950, -17947, -17931, -17928, -17922, -17759, -17752, -17733, -17730, -17721, -17703, -17701, -17697, -17692, -17683, -17676, -17496, -17487, -17482, -17468, -17454, -17433, -17427, -17417, -17202, -17185, -16983, -16970, -16942, -16915, -16733, -16708, -16706, -16689, -16664, -16657, -16647, -16474, -16470, -16465, -16459, -16452, -16448, -16433, -16429, -16427, -16423, -16419, -16412, -16407, -16403, -16401, -16393, -16220, -16216, -16212, -16205, -16202, -16187, -16180, -16171, -16169, -16158, -16155, -15959, -15958, -15944, -15933, -15920, -15915, -15903, -15889, -15878, -15707, -15701, -15681, -15667, -15661, -15659, -15652, -15640, -15631, -15625, -15454, -15448, -15436, -15435, -15419, -15416, -15408, -15394, -15385, -15377, -15375, -15369, -15363, -15362, -15183, -15180, -15165, -15158, -15153, -15150, -15149, -15144, -15143, -15141, -15140, -15139, -15128, -15121, -15119, -15117, -15110, -15109, -14941, -14937, -14933, -14930, -14929, -14928, -14926, -14922, -14921, -14914, -14908, -14902, -14894, -14889, -14882, -14873, -14871, -14857, -14678, -14674, -14670, -14668, -14663, -14654, -14645, -14630, -14594, -14429, -14407, -14399, -14384, -14379, -14368, -14355, -14353, -14345, -14170, -14159, -14151, -14149, -14145, -14140, -14137, -14135, -14125, -14123, -14122, -14112, -14109, -14099, -14097, -14094, -14092, -14090, -14087, -14083, -13917, -13914, -13910, -13907, -13906, -13905, -13896, -13894, -13878, -13870, -13859, -13847, -13831, -13658, -13611, -13601, -13406, -13404, -13400, -13398, -13395, -13391, -13387, -13383, -13367, -13359, -13356, -13343, -13340, -13329, -13326, -13318, -13147, -13138, -13120, -13107, -13096, -13095, -13091, -13076, -13068, -13063, -13060, -12888, -12875, -12871, -12860, -12858, -12852, -12849, -12838, -12831, -12829, -12812, -12802, -12607, -12597, -12594, -12585, -12556, -12359, -12346, -12320, -12300, -12120, -12099, -12089, -12074, -12067, -12058, -12039, -11867, -11861, -11847, -11831, -11798, -11781, -11604, -11589, -11536, -11358, -11340, -11339, -11324, -11303, -11097, -11077, -11067, -11055, -11052, -11045, -11041, -11038, -11024, -11020, -11019, -11018, -11014, -10838, -10832, -10815, -10800, -10790, -10780, -10764, -10587, -10544, -10533, -10519, -10331, -10329, -10328, -10322, -10315, -10309, -10307, -10296, -10281, -10274, -10270, -10262, -10260, -10256, -10254 }; public static String[] pystr = new String[] { "a", "ai", "an", "ang", "ao", "ba", "bai", "ban", "bang", "bao", "bei", "ben", "beng", "bi", "bian", "biao", "bie", "bin", "bing", "bo", "bu", "ca", "cai", "can", "cang", "cao", "ce", "ceng", "cha", "chai", "chan", "chang", "chao", "che", "chen", "cheng", "chi", "chong", "chou", "chu", "chuai", "chuan", "chuang", "chui", "chun", "chuo", "ci", "cong", "cou", "cu", "cuan", "cui", "cun", "cuo", "da", "dai", "dan", "dang", "dao", "de", "deng", "di", "dian", "diao", "die", "ding", "diu", "dong", "dou", "du", "duan", "dui", "dun", "duo", "e", "en", "er", "fa", "fan", "fang", "fei", "fen", "feng", "fo", "fou", "fu", "ga", "gai", "gan", "gang", "gao", "ge", "gei", "gen", "geng", "gong", "gou", "gu", "gua", "guai", "guan", "guang", "gui", "gun", "guo", "ha", "hai", "han", "hang", "hao", "he", "hei", "hen", "heng", "hong", "hou", "hu", "hua", "huai", "huan", "huang", "hui", "hun", "huo", "ji", "jia", "jian", "jiang", "jiao", "jie", "jin", "jing", "jiong", "jiu", "ju", "juan", "jue", "jun", "ka", "kai", "kan", "kang", "kao", "ke", "ken", "keng", "kong", "kou", "ku", "kua", "kuai", "kuan", "kuang", "kui", "kun", "kuo", "la", "lai", "lan", "lang", "lao", "le", "lei", "leng", "li", "lia", "lian", "liang", "liao", "lie", "lin", "ling", "liu", "long", "lou", "lu", "lv", "luan", "lue", "lun", "luo", "ma", "mai", "man", "mang", "mao", "me", "mei", "men", "meng", "mi", "mian", "miao", "mie", "min", "ming", "miu", "mo", "mou", "mu", "na", "nai", "nan", "nang", "nao", "ne", "nei", "nen", "neng", "ni", "nian", "niang", "niao", "nie", "nin", "ning", "niu", "nong", "nu", "nv", "nuan", "nue", "nuo", "o", "ou", "pa", "pai", "pan", "pang", "pao", "pei", "pen", "peng", "pi", "pian", "piao", "pie", "pin", "ping", "po", "pu", "qi", "qia", "qian", "qiang", "qiao", "qie", "qin", "qing", "qiong", "qiu", "qu", "quan", "que", "qun", "ran", "rang", "rao", "re", "ren", "reng", "ri", "rong", "rou", "ru", "ruan", "rui", "run", "ruo", "sa", "sai", "san", "sang", "sao", "se", "sen", "seng", "sha", "shai", "shan", "shang", "shao", "she", "shen", "sheng", "shi", "shou", "shu", "shua", "shuai", "shuan", "shuang", "shui", "shun", "shuo", "si", "song", "sou", "su", "suan", "sui", "sun", "suo", "ta", "tai", "tan", "tang", "tao", "te", "teng", "ti", "tian", "tiao", "tie", "ting", "tong", "tou", "tu", "tuan", "tui", "tun", "tuo", "wa", "wai", "wan", "wang", "wei", "wen", "weng", "wo", "wu", "xi", "xia", "xian", "xiang", "xiao", "xie", "xin", "xing", "xiong", "xiu", "xu", "xuan", "xue", "xun", "ya", "yan", "yang", "yao", "ye", "yi", "yin", "ying", "yo", "yong", "you", "yu", "yuan", "yue", "yun", "za", "zai", "zan", "zang", "zao", "ze", "zei", "zen", "zeng", "zha", "zhai", "zhan", "zhang", "zhao", "zhe", "zhen", "zheng", "zhi", "zhong", "zhou", "zhu", "zhua", "zhuai", "zhuan", "zhuang", "zhui", "zhun", "zhuo", "zi", "zong", "zou", "zu", "zuan", "zui", "zun", "zuo" }; private StringBuilder buffer; private String resource; private static CharacterParser characterParser = new CharacterParser(); public static CharacterParser getInstance() { return characterParser; } public String getResource() { return resource; } public void setResource(String resource) { this.resource = resource; } /** * 汉字转成ASCII码 * * @param chs * @return */ private int getChsAscii(String chs) { int asc = 0; if (chs == null) { return asc; } try { byte[] bytes = chs.getBytes("gb2312"); if (bytes.length > 2 || bytes.length <= 0) { throw new RuntimeException("illegal resource string"); } if (bytes.length == 1) { asc = bytes[0]; } if (bytes.length == 2) { int hightByte = 256 + bytes[0]; int lowByte = 256 + bytes[1]; asc = (256 * hightByte + lowByte) - 256 * 256; } } catch (Exception e) { System.out.println("ERROR:ChineseSpelling.class-getChsAscii(String chs)" + e); } return asc; } /** * 单字解析 * * @param str * @return */ public String convert(String str) { String result = null; int ascii = getChsAscii(str); if (ascii > 0 && ascii < 160) { result = String.valueOf((char) ascii); } else { for (int i = (pyvalue.length - 1); i >= 0; i--) { if (pyvalue[i] <= ascii) { result = pystr[i]; break; } } } return result; } /** * 词组解析 * * @param chs * @return */ public String getSelling(String chs) { String key, value; buffer = new StringBuilder(); for (int i = 0; i < chs.length(); i++) { key = chs.substring(i, i + 1); if (key.getBytes().length >= 2) { value = convert(key); if (value == null) { value = "unknown"; } } else { value = key; } buffer.append(value); } return buffer.toString(); } public String getSpelling() { return this.getSelling(this.getResource()); }}2.6实体类：
package com.lidong.demo.view.fragment;/** * Created by lidong on 2016/4/12. */public class Friend { String name; //名字 String letters; // 字母 public String getName() { return name; } public void setName(String name) { this.name = name; } public String getLetters() { return letters; } public void setLetters(String letters) { this.letters = letters; }}3 界面的代码：
package com.lidong.demo.view;import android.content.Context;import android.os.Bundle;import android.support.v7.app.AppCompatActivity;import android.util.Log;import android.view.View;import android.view.ViewGroup;import android.widget.AdapterView;import android.widget.BaseAdapter;import android.widget.BaseExpandableListAdapter;import android.widget.ExpandableListView;import android.widget.TextView;import android.widget.Toast;import com.lidong.demo.R;import com.lidong.demo.view.fragment.CharacterParser;import com.lidong.demo.view.fragment.Friend;import com.lidong.demo.view.fragment.PinyinComparator;import java.util.ArrayList;import java.util.Collections;import java.util.HashMap;import java.util.List;import java.util.Map;import butterknife.Bind;import butterknife.ButterKnife;public class ExtenpListViewActivity extends AppCompatActivity { @Bind(R.id.elv_good_friend) ExpandableListView elvGoodFriend; MyExpandableListViewAdapter mMyExpandableListViewAdapter; /** * 组的数据 */ private static final String[] mGroup = new String[] {"我的好友","我的关注"}; /** * 每个组的数据 */ private String[][] mGroupData = new String[][] { { "王银1", "王银2", "王银3"}, { "李1", "王1", "李2", "王2", "李3", "王3"}}; private String TAG = ExtenpListViewActivity.class.getSimpleName(); private Map> mMap = new HashMap<>(); private int mFlag = 1; /** * 根据拼音来排列ListView里面的数据类 */ private PinyinComparator pinyinComparator; /** * 汉字转换成拼音的类 */ private CharacterParser characterParser; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_cicle); ButterKnife.bind(this); initData(); pinyinComparator = PinyinComparator.getInstance(); characterParser = CharacterParser.getInstance(); mMyExpandableListViewAdapter = new MyExpandableListViewAdapter(this); elvGoodFriend.setAdapter(mMyExpandableListViewAdapter); elvGoodFriend.setOnChildClickListener(new ExpandableListView.OnChildClickListener() { @Override public boolean onChildClick(ExpandableListView parent, View v, int groupPosition, int childPosition, long id) { Log.d(TAG, "onChildClick() called with: " + "parent = [" + parent + "], v = [" + v + "], groupPosition = [" + groupPosition + "], childPosition = [" + childPosition + "], id = [" + id + "]"); return false; } }); } private void initData() { List list = new ArrayList<>(); Friend f1 = new Friend(); f1.setName("王银1"); list.add(f1); mMap.put("我的好友",list); List list2 = new ArrayList<>(); Friend f2 = new Friend(); f2.setName("王银2"); list2.add(f2); Friend f3 = new Friend(); f3.setName("李2"); list2.add(f3); Friend f4 = new Friend(); f4.setName("胡3"); list2.add(f4); mMap.put("我的关注",list2); Log.d(TAG, "initData() called with: " + mMap.get("我的好友").toString()+"--"+mMap.get("我的关注").toString()); } /** *@类名 : ExtenpListViewActivity *@描述 : *@时间 : 2016/4/12 13:56 *@作者: 李东 *@邮箱 : lidong@chni.com.cn *@company: chni */ private class MyExpandableListViewAdapter extends BaseExpandableListAdapter{ public MyExpandableListViewAdapter(Context context) { this.context = context; } private Context context; @Override public int getGroupCount() { return mGroup.length; } @Override public int getChildrenCount(int groupPosition) { return 1;//注意返回值必须为1，不然会重复 } @Override public Object getGroup(int groupPosition) { return mGroup[groupPosition] ; } @Override public Object getChild(int groupPosition, int childPosition) { return mGroupData[groupPosition][childPosition]; } @Override public long getGroupId(int groupPosition) { return groupPosition; } @Override public long getChildId(int groupPosition, int childPosition) { int count = 0; count = mGroupData[groupPosition].length; return count; } @Override public boolean hasStableIds() { return false; } @Override public View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) { TextView text = (TextView) View.inflate(context, android.R.layout.simple_expandable_list_item_1, null); text.setText(mGroup[groupPosition]); return text; } @Override public View getChildView(final int groupPosition, final int childPosition, boolean isLastChild, View convertView, ViewGroup parent) { if (groupPosition==0){ SubListView lv = (SubListView) View.inflate(context, R.layout.item_expend_listview, null); final List mSourceDateList = mMap.get("我的好友"); ListViewAdaAdapter1 listViewAdaAdapter = new ListViewAdaAdapter1(mSourceDateList, context); lv.setAdapter(listViewAdaAdapter); lv.setOnItemClickListener(new AdapterView.OnItemClickListener() { @Override public void onItemClick(AdapterView<?> parent, View view, int position, long id) { Toast.makeText(ExtenpListViewActivity.this, mSourceDateList.get(position).getName(),Toast.LENGTH_SHORT).show(); } }); return lv; }else{ SubListView lv = (SubListView) View.inflate(context, R.layout.item_expend_listview, null); final List mSourceDateList = mMap.get("我的关注"); Log.d(TAG, "mSourceDateList: " + mSourceDateList.size()); List SourceDateList = new ArrayList<>(); Log.d(TAG, "getChildView() called with: " + "groupPosition = [" + groupPosition + "], childPosition = [" + childPosition + "], convertView = [" + convertView + "],数据" + mSourceDateList.size()); SourceDateList= filledData(mSourceDateList); // 根据a-z进行排序源数据 Collections.sort(SourceDateList, pinyinComparator); ListViewAdaAdapter listViewAdaAdapter = new ListViewAdaAdapter(SourceDateList, context); lv.setAdapter(listViewAdaAdapter); final List finalSourceDateList = SourceDateList; lv.setOnItemClickListener(new AdapterView.OnItemClickListener() { @Override public void onItemClick(AdapterView<?> parent, View view, int position, long id) { Toast.makeText(ExtenpListViewActivity.this, finalSourceDateList.get(position).getName(),Toast.LENGTH_SHORT).show(); } }); return lv; } } @Override public boolean isChildSelectable(int groupPosition, int childPosition) { return false; } } private class ListViewAdaAdapter1 extends BaseAdapter{ List mName; Context mContext; public ListViewAdaAdapter1( List name, Context context) { mName = name; mContext = context; } @Override public int getCount() { return mName.size(); } @Override public Object getItem(int position) { return mName.get(position); } @Override public long getItemId(int position) { return position; } @Override public View getView(int position, View convertView, ViewGroup parent) { ViewHolder holder =null; if (convertView ==null) { holder = new ViewHolder(); convertView = View.inflate(mContext, R.layout.item_listview_item1, null); holder.mTextView = (TextView) convertView.findViewById(R.id.tv_text); convertView.setTag(holder); }else { holder = (ViewHolder) convertView.getTag(); } Log.d(TAG, "getView() called with: " + "position = [" + position + "], 数据"+mName.get(position).getName()); holder.mTextView.setText(mName.get(position).getName()); return convertView; } private class ViewHolder { TextView mTextView; } } private class ListViewAdaAdapter extends BaseAdapter{ List mName; Context mContext; public ListViewAdaAdapter( List name, Context context) { mName = name; mContext = context; } @Override public int getCount() { return mName.size(); } @Override public Object getItem(int position) { return mName.get(position); } @Override public long getItemId(int position) { return position; } @Override public View getView(int position, View convertView, ViewGroup parent) { ViewHolder holder =null; if (convertView ==null) { holder = new ViewHolder(); convertView = View.inflate(mContext, R.layout.item_listview_item, null); holder.mTextView = (TextView) convertView.findViewById(R.id.tv_text); holder.mCatalog = (TextView) convertView.findViewById(R.id.catalog); convertView.setTag(holder); }else { holder = (ViewHolder) convertView.getTag(); } Log.d(TAG, "getView() called with: " + "position = [" + position + "], 数据"+mName.get(position).getName()); holder.mTextView.setText(mName.get(position).getName()); holder.mCatalog.setText(mName.get(position).getLetters()); return convertView; } private class ViewHolder { TextView mTextView,mCatalog; } } /** * 为ListView填充数据 * * @param * @return */ private List filledData(List lsit) { List mFriendList = new ArrayList<>(); for (int i = 0; i < lsit.size(); i++) { Friend friendModel = new Friend(); friendModel.setName(lsit.get(i).getName()); //汉字转换成拼音 String pinyin = characterParser.getSelling(lsit.get(i).getName()); String sortString = pinyin.substring(0, 1).toUpperCase(); // 正则表达式，判断首字母是否是英文字母 if (sortString.matches("[A-Z]")) { friendModel.setLetters(sortString.toUpperCase()); } else { friendModel.setLetters("#"); } mFriendList.add(friendModel); } return mFriendList; }} 总结一下，大概就这几步，实现起来虽然不然麻烦，但是代码也挺多的。
就这些了。
代码下载地址
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