android 百度地图离线地图功能

最近做了一个百度地图离线地图的功能，虽然功能实现了，但过程中也碰到了一些问题。首先，看看效果图吧。

1、离线地图相关API

API地址：http://wiki.lbsyun.baidu.com/cms/androidsdk/doc/v4_0_0/index.html

MKOfflineMap类

主要的一个类，提供了离线地图的管理功能，例如，下载，暂停、更新，删除等功能。每次只允许一个下载任务进行，后面的需要排队。

void destroy()
销毁离线地图管理模块，不用时调用
java.util.ArrayList< MKOLUpdateElement> getAllUpdateInfo()
返回各城市离线地图更新信息，已下载的离线地图
java.util.ArrayList< MKOLSearchRecord> getHotCityList()
返回热门城市列表
java.util.ArrayList getOfflineCityList()
返回支持离线地图城市列表
MKOLUpdateElement getUpdateInfo(int cityID)
返回指定城市ID离线地图更新信息
boolean init(MKOfflineMapListener listener)
初使化
boolean pause(int cityID)
暂停下载或更新指定城市ID的离线地图
boolean remove(int cityID)
删除指定城市ID的离线地图
java.util.ArrayList< MKOLSearchRecord> searchCity(java.lang.String
cityName)
根据城市名搜索该城市离线地图记录
boolean start(int cityID)
启动下载指定城市ID的离线地图，或在暂停更新某城市后继续更新下载某城市离线地图
boolean update(int cityID)
启动更新指定城市ID的离线地图

MKOLSearchRecord类

离线地图搜索城市记录结构

java.util.ArrayList< MKOLSearchRecord> childCities
子城市列表
int cityID
城市ID
java.lang.String cityName
城市名称
int cityType
城市类型0:全国；1：省份；2：城市,如果是省份，可以通过childCities得到子城市列表
int size
数据包总大小

MKOLUpdateElement类

离线地图更新信息，下面是其中的一些字段

int cityID
城市ID
java.lang.String cityName
城市名称
static int DOWNLOADING
正在下载
LatLng geoPt
城市中心点坐标
int level
离线包地图层级
int ratio
下载比率，100为下载完成
int serversize
服务端数据大小
int size
已下载数据大小
int status
下载状态
boolean update
是否为更新

MKOfflineMapListener接口

该接口返回新安装离线地图、下载更新、数据版本更新等结果，用户需要实现该接口以处理相应事件。里面有一个唯一的方法：

void onGetOfflineMapState(int type, int state) 返回通知事件

2、主要代码

OfflineActivity类

/* 此Demo用来演示离线地图的下载和显示 */
public class OfflineActivity extends Activity implements MKOfflineMapListener {private MKOfflineMap mOffline = null;private TextView cidView;private TextView stateView;private EditText cityNameView;private HashMap<String, Boolean> hashMap = new HashMap<String, Boolean>(); //是否已下载;private CityExpandableListAdapter adapter;private HotcityListAdapter hAdapter;private OfflineHandler offlineHandler;private MKOLSearchRecord currentRecord;private ArrayList<MKOLUpdateElement> loadingList = new ArrayList<MKOLUpdateElement>();private ArrayList<MKOLUpdateElement> loadedList = new ArrayList<MKOLUpdateElement>();public HashMap<String,String> clickMap;/*** 已下载的离线地图信息列表*/public ArrayList<MKOLUpdateElement> localMapList = null;private LocalMapAdapter lAdapter = null;private loadingMapAdapter dAdapter = null;protected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_offline);ImageButton back = (ImageButton) findViewById(R.id.back);back.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View v) {OfflineActivity.this.finish();}});offlineHandler = new OfflineHandler(this);mOffline = new MKOfflineMap();mOffline.init(this);initView();initCurLocation();}LocationManager lm = null; // location管理器LocationClient mLocClient;private void initCurLocation(){lm = (LocationManager) getSystemService(Context.LOCATION_SERVICE);if (lm != null) {// 定位初始化mLocClient = new LocationClient(this);mLocClient.registerLocationListener(new MyLocationListenner());LocationClientOption option = new LocationClientOption();option.setOpenGps(true);// 打开gpsoption.setCoorType("bd09ll"); // 设置坐标类型option.setPriority(LocationClientOption.NetWorkFirst);//设置网络优先(不设置，默认是gps优先)option.setAddrType("all");// 返回的定位结果包含地址信息option.setScanSpan(10000);// 设置发起定位请求的间隔时间为10s(小于1秒则一次定位)mLocClient.setLocOption(option);mLocClient.start();}else {SystemUtil.showMessage("请打开GPS定位设置");}}public void setCurrentLocation(String currentLocation) {TextView current = (TextView) findViewById(R.id.current_name);current.setText(currentLocation);currentRecord = search(currentLocation);RelativeLayout currentItem = (RelativeLayout)findViewById(R.id.current_item);currentItem.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View v) {if (hashMap.get(currentRecord.cityName)){Toast.makeText(OfflineActivity.this, "离线地图已下载", Toast.LENGTH_LONG).show();}else {TextView currentSize = (TextView) v.findViewById(R.id.current_size);currentSize.setText("正在下载");start(currentRecord.cityID);}}});}public class MyLocationListenner implements BDLocationListener {@Overridepublic void onReceiveLocation(BDLocation location) {MyLocationData locData = new MyLocationData.Builder().accuracy(location.getRadius())// 此处设置开发者获取到的方向信息，顺时针0-360.direction(100).latitude(location.getLatitude()).longitude(location.getLongitude()).build();String address=location.getAddrStr();String city=location.getCity();//            System.out.println("地址："+address+"城市："+city);setCurrentLocation(city);}public void onReceivePoi(BDLocation poiLocation) {}}private void initView() {// 获取已下过的离线地图信息localMapList = mOffline.getAllUpdateInfo();if (localMapList == null) {localMapList = new ArrayList<MKOLUpdateElement>();}ListView localMapListView = (ListView) findViewById(R.id.localmaplist);lAdapter = new LocalMapAdapter();localMapListView.setAdapter(lAdapter);ListView loadingListView = (ListView)findViewById(R.id.lodinglist);dAdapter = new loadingMapAdapter();loadingListView.setAdapter(dAdapter);//        cidView = (TextView) findViewById(R.id.cityid);
//        cityNameView = (EditText) findViewById(R.id.city);
//        stateView = (TextView) findViewById(R.id.state);ListView hotCityList = (ListView) findViewById(R.id.hotcitylist);final ArrayList<Integer> hotCities = new ArrayList<Integer>();// 获取热门城市列表final ArrayList<MKOLSearchRecord> records1 = mOffline.getHotCityList();if (records1 != null) {for (MKOLSearchRecord r : records1) {hotCities.add(r.cityID);}}hAdapter = new HotcityListAdapter(this, records1,hashMap);hotCityList.setAdapter(hAdapter);hotCityList.setOnItemClickListener(new AdapterView.OnItemClickListener() {@Overridepublic void onItemClick(AdapterView<?> parent, View view, int position, long id) {if (hashMap.get(records1.get(position).cityName)){Toast.makeText(OfflineActivity.this, "离线地图已下载", Toast.LENGTH_LONG).show();}else {TextView childSize = (TextView) view.findViewById(R.id.child_size);childSize.setText("正在下载");start(records1.get(position).cityID);}}});ExpandableListView allCityList = (ExpandableListView) findViewById(R.id.allcitylist);// 获取所有支持离线地图的城市final ArrayList<MKOLSearchRecord> records2 = mOffline.getOfflineCityList();clickMap = new HashMap<String, String>();if (records1 != null) {for (MKOLSearchRecord r : records2) {
//                allCities.add(r.cityName+"--" + this.formatDataSize(r.size));
//                allCitiyIds.add(r.cityID);hashMap.put(r.cityName,downList(r.cityName));clickMap.put(r.cityName, "0");if (r.childCities != null && r.childCities.size() != 0){ArrayList<MKOLSearchRecord> childrecord = r.childCities;
//for (MKOLSearchRecord cr : childrecord){hashMap.put(cr.cityName,downList(cr.cityName));}}}}adapter = new CityExpandableListAdapter(this,records2,hashMap);allCityList.setAdapter(adapter);allCityList.setGroupIndicator(null);hAdapter.notifyDataSetChanged();allCityList.setOnGroupClickListener(new ExpandableListView.OnGroupClickListener() {@Overridepublic boolean onGroupClick(ExpandableListView parent, View v, int groupPosition, long id) {if (records2 != null ){MKOLSearchRecord record = records2.get(groupPosition);if (record.childCities == null){if (hashMap.get(record.cityName)){Toast.makeText(OfflineActivity.this, "离线地图已下载", Toast.LENGTH_LONG).show();}else{
//                            System.out.println("simplename:"+v.getClass().getSimpleName());int cd = record.cityID;start(cd);/* int size = ((ViewGroup)v).getChildCount();for (int i = 0 ; i< size; i++){View child = ((ViewGroup)v).getChildAt(i);System.out.println("simplename:"+child.getClass().getSimpleName());}View child = ((ViewGroup)v).getChildAt(1);((TextView)child).setText("正在下载");*/clickMap.put(record.cityName, "1");
//                            adapter.notifyDataSetChanged();}}}return false;}});allCityList.setOnChildClickListener(new ExpandableListView.OnChildClickListener() {@Overridepublic boolean onChildClick(ExpandableListView parent, View v, int groupPosition, int childPosition, long id) {if (records2 != null){MKOLSearchRecord record = records2.get(groupPosition);MKOLSearchRecord cldred = record.childCities.get(childPosition);if (hashMap.get(cldred.cityName)){Toast.makeText(OfflineActivity.this, "离线地图已下载", Toast.LENGTH_LONG).show();}else {TextView childSize = (TextView) v.findViewById(R.id.child_size);childSize.setText("正在下载");start(cldred.cityID);}}return false;}});LinearLayout cl = (LinearLayout) findViewById(R.id.citylist_layout);LinearLayout lm = (LinearLayout) findViewById(R.id.localmap_layout);lm.setVisibility(View.GONE);cl.setVisibility(View.VISIBLE);}public boolean downList(String cityName){Boolean flag = false;if (localMapList != null){for (int i = 0; i <localMapList.size(); i++){MKOLUpdateElement element= localMapList.get(i);
//                System.out.println("离线城市："+element.cityName);if (cityName.equals(element.cityName)){flag = true;break;}else {flag =  false;}}}return flag;}/*** 切换至城市列表** @param view*/public void clickCityListButton(View view) {LinearLayout cl = (LinearLayout) findViewById(R.id.citylist_layout);LinearLayout lm = (LinearLayout) findViewById(R.id.localmap_layout);lm.setVisibility(View.GONE);cl.setVisibility(View.VISIBLE);Button clButton = (Button)findViewById(R.id.clButton);clButton.setBackgroundResource(R.drawable.city_list_pressed);clButton.setTextColor(Color.parseColor("#4196fd"));Button localButton = (Button) findViewById(R.id.localButton);localButton.setBackgroundResource(R.drawable.down_manager);localButton.setTextColor(Color.parseColor("#ffffff"));}/*** 切换至下载管理列表** @param view*/public void clickLocalMapListButton(View view) {LinearLayout cl = (LinearLayout) findViewById(R.id.citylist_layout);LinearLayout lm = (LinearLayout) findViewById(R.id.localmap_layout);lm.setVisibility(View.VISIBLE);cl.setVisibility(View.GONE);Button localButton = (Button) findViewById(R.id.localButton);localButton.setBackgroundResource(R.drawable.down_manager_pressed);localButton.setTextColor(Color.parseColor("#4196fd"));Button clButton = (Button)findViewById(R.id.clButton);clButton.setBackgroundResource(R.drawable.city_list);clButton.setTextColor(Color.parseColor("#ffffff"));updateView(null, false);}/*** 搜索离线需市** @param*/public MKOLSearchRecord search(String city) {ArrayList<MKOLSearchRecord> records = mOffline.searchCity(city);if (records == null || records.size() != 1) {return null;}
//        cidView.setText(String.valueOf(records.get(0).cityID));TextView current_size = (TextView) findViewById(R.id.current_size);if (hashMap.get(records.get(0).cityName)){current_size.setText("已下载");}else {current_size.setText(formatDataSize(records.get(0).size));}return records.get(0);}/*** 开始下载** @param*/public void start(int cityid) {
//        int cityid = Integer.parseInt(cidView.getText().toString());mOffline.start(cityid);clickLocalMapListButton(null);
//        Toast.makeText(this, "开始下载离线地图. cityid: " + cityid, Toast.LENGTH_SHORT).show();updateView(null, false);}/*** 暂停下载** @param view*/public void stop(View view) {int cityid = Integer.parseInt(cidView.getText().toString());mOffline.pause(cityid);Toast.makeText(this, "暂停下载离线地图. cityid: " + cityid, Toast.LENGTH_SHORT).show();updateView(null, false);}/*** 删除离线地图** @param view*/public void remove(View view) {int cityid = Integer.parseInt(cidView.getText().toString());mOffline.remove(cityid);Toast.makeText(this, "删除离线地图. cityid: " + cityid, Toast.LENGTH_SHORT).show();updateView(null,false);}/*** 更新状态显示*/public void updateView(MKOLUpdateElement element, boolean flag) {localMapList = mOffline.getAllUpdateInfo();if (localMapList == null) {localMapList = new ArrayList<MKOLUpdateElement>();}loadingList.clear();loadedList.clear();for (MKOLUpdateElement element1 : localMapList){if (element1.ratio != 100){loadingList.add(element1);}else {loadedList.add(element1);}}if (element != null){hashMap.put(element.cityName, flag);if (currentRecord.cityID == element.cityID){TextView currentSize = (TextView) findViewById(R.id.current_size);if(flag){currentSize.setText("已下载");}else {currentSize.setText(formatDataSize(element.size));}}else {adapter.notifyDataSetChanged();hAdapter.notifyDataSetChanged();}}lAdapter.notifyDataSetChanged();dAdapter.notifyDataSetChanged();}@Overrideprotected void onPause() {
//        int cityid = Integer.parseInt(cidView.getText().toString());
//        MKOLUpdateElement temp = mOffline.getUpdateInfo(cityid);
//        if (temp != null && temp.status == MKOLUpdateElement.DOWNLOADING) {//            mOffline.pause(cityid);
//        }super.onPause();}@Overrideprotected void onResume() {super.onResume();}public String formatDataSize(int size) {String ret = "";if (size < (1024 * 1024)) {ret = String.format("%dK", size / 1024);} else {ret = String.format("%.1fM", size / (1024 * 1024.0));}return ret;}@Overrideprotected void onDestroy() {/*** 退出时，销毁离线地图模块*/mOffline.destroy();super.onDestroy();}@Overridepublic void onGetOfflineMapState(int type, int state) {switch (type) {case MKOfflineMap.TYPE_DOWNLOAD_UPDATE: {MKOLUpdateElement update = mOffline.getUpdateInfo(state);// 处理下载进度更新提示if (update != null) {//                    stateView.setText(String.format("%s : %d%%", update.cityName,
//                            update.ratio));
//                    System.out.println("ratio:"+update.ratio);if (update.ratio == 100){updateView(update,true);}else {updateView(null, false);}}}break;case MKOfflineMap.TYPE_NEW_OFFLINE:// 有新离线地图安装Log.d("OfflineDemo", String.format("add offlinemap num:%d", state));break;case MKOfflineMap.TYPE_VER_UPDATE:// 版本更新提示// MKOLUpdateElement e = mOffline.getUpdateInfo(state);break;default:break;}}/*** 正在下载城市列表适配器*/public class loadingMapAdapter extends BaseAdapter{@Overridepublic int getCount() {return loadingList.size();}@Overridepublic Object getItem(int position) {return loadingList.get(position);}@Overridepublic long getItemId(int position) {return position;}@Overridepublic View getView(int position, View convertView, ViewGroup parent) {if (convertView == null){convertView = LayoutInflater.from(OfflineActivity.this).inflate(R.layout.loding_list, null);}TextView name = (TextView) convertView.findViewById(R.id.city_name);TextView size = (TextView)convertView.findViewById(R.id.city_size);TextView ratio = (TextView)convertView.findViewById(R.id.down_ratio);ImageButton manager= (ImageButton) convertView.findViewById(R.id.down_manager);final MKOLUpdateElement ele = loadingList.get(position);name.setText(ele.cityName);size.setText(formatDataSize(ele.size));ratio.setText(ele.ratio+"%");manager.setOnClickListener(new OnClickListener() {boolean flag = true;@Overridepublic void onClick(View v) {if (flag) {mOffline.pause(ele.cityID);v.setBackgroundResource(R.drawable.loading_start);flag = false;}else {mOffline.start(ele.cityID);v.setBackgroundResource(R.drawable.loading_pause);flag = true;}}});return convertView;}}/*** 离线地图管理列表适配器*/public class LocalMapAdapter extends BaseAdapter {@Overridepublic int getCount() {return loadedList.size();}@Overridepublic Object getItem(int index) {return loadedList.get(index);}@Overridepublic long getItemId(int index) {return index;}@Overridepublic View getView(int index, View view, ViewGroup arg2) {MKOLUpdateElement e = (MKOLUpdateElement) getItem(index);view = View.inflate(OfflineActivity.this,R.layout.offline_localmap_list, null);initViewItem(view, e);return view;}void initViewItem(View view, final MKOLUpdateElement e) {Button remove = (Button) view.findViewById(R.id.remove);TextView title = (TextView) view.findViewById(R.id.title);TextView update = (TextView) view.findViewById(R.id.update);
//            TextView ratio = (TextView) view.findViewById(R.id.ratio);Button doUpdate = (Button) view.findViewById(R.id.exe_update);
//            ratio.setText(e.ratio + "%");title.setText(e.cityName);if (e.update) {update.setText("可更新");} else {update.setText("最新");}remove.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View arg0) {mOffline.remove(e.cityID);clickMap.put(e.cityName,"0");updateView(e, false);}});doUpdate.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View v) {mOffline.update(e.cityID);}});}}}

布局文件activity_offline.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"android:layout_width="match_parent"android:layout_height="match_parent"android:orientation="vertical"android:background="@color/white"><RelativeLayout android:layout_width="match_parent" android:layout_height="wrap_content"android:background="@drawable/bg_titlebar"><ImageButtonandroid:id="@+id/back"android:layout_width="32dp"android:layout_height="32dp"android:layout_centerVertical="true"android:layout_marginLeft="10.0dip"android:paddingRight="8.0dip"android:background="@drawable/titlebar_back"android:contentDescription="@string/back" /><LinearLayoutandroid:id="@+id/city_list"android:layout_width="wrap_content"android:layout_height="wrap_content"android:orientation="horizontal"android:layout_centerInParent="true"android:padding="1dp"android:background="@drawable/edit_search2"><Buttonandroid:id="@+id/clButton"android:layout_width="wrap_content"android:layout_height="wrap_content"android:onClick="clickCityListButton"android:padding="8dp"android:text="城市列表"android:textColor="#4196fd"android:background="@drawable/city_list_pressed"/><Buttonandroid:id="@+id/localButton"android:layout_width="wrap_content"android:layout_height="wrap_content"android:onClick="clickLocalMapListButton"android:padding="8dp"android:text="下载管理"android:textColor="@color/white"android:background="@drawable/down_manager"/></LinearLayout></RelativeLayout>
<!--    <LinearLayoutxmlns:android="http://schemas.android.com/apk/res/android"android:layout_width="fill_parent"android:layout_height="50dip"android:orientation="horizontal" ><TextViewandroid:id="@+id/cityid"android:layout_width="fill_parent"android:layout_height="wrap_content"android:layout_weight="1"android:text="131" />&lt;!&ndash; 隐藏输入法用 &ndash;&gt;<LinearLayoutandroid:layout_width="0px"android:layout_height="0px"android:focusable="true"android:focusableInTouchMode="true" /><EditTextandroid:id="@+id/city"android:layout_width="fill_parent"android:layout_height="wrap_content"android:layout_weight="1"android:text="北京" /><Buttonandroid:id="@+id/search"android:layout_width="fill_parent"android:layout_height="wrap_content"android:layout_weight="1"android:onClick="search"android:text="搜索" /></LinearLayout><LinearLayoutxmlns:android="http://schemas.android.com/apk/res/android"android:layout_width="fill_parent"android:layout_height="50dip"android:orientation="horizontal" ><TextViewandroid:id="@+id/state"android:layout_width="fill_parent"android:layout_height="wrap_content"android:layout_weight="1"android:text="已下载:-" /><Buttonandroid:id="@+id/start"android:layout_width="fill_parent"android:layout_height="wrap_content"android:layout_weight="1"android:onClick="start"android:text="开始" /><Buttonandroid:id="@+id/stop"android:layout_width="fill_parent"android:layout_height="wrap_content"android:layout_weight="1"android:onClick="stop"android:text="停止" /><Buttonandroid:id="@+id/del"android:layout_width="fill_parent"android:layout_height="wrap_content"android:layout_weight="1"android:onClick="remove"android:text="删除" /></LinearLayout>--><LinearLayoutxmlns:android="http://schemas.android.com/apk/res/android"android:id="@+id/citylist_layout"android:layout_width="match_parent"android:layout_height="match_parent"android:orientation="vertical" ><TextViewandroid:layout_width="match_parent"android:layout_height="32dp"android:text="当前位置"android:layout_marginLeft="2dp"android:textSize="16sp"android:gravity="center_vertical"android:textColor="@color/font_color"android:background="#f0f3f5"/><RelativeLayout android:layout_width="match_parent" android:layout_height="40dp"android:id="@+id/current_item"><TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_centerVertical="true"android:text="定位中..." android:textColor="@color/font_color" android:textSize="16sp"android:id="@+id/current_name" android:layout_marginLeft="12dp"/><TextView android:layout_width="wrap_content" android:layout_height="wrap_content"android:text="--" android:textColor="@color/font_color" android:id="@+id/current_size"android:layout_centerVertical="true" android:layout_alignParentRight="true" android:layout_marginRight="12dp"/></RelativeLayout><TextViewandroid:layout_width="match_parent"android:layout_height="32dp"android:text="热门城市"android:layout_marginLeft="2dp"android:textSize="16sp"android:gravity="center_vertical"android:textColor="@color/font_color"android:background="#f0f3f5"/><ListViewandroid:id="@+id/hotcitylist"android:layout_width="fill_parent"android:layout_height="200dip"android:cacheColorHint="#00000000"android:scrollingCache="false"android:listSelector="@drawable/item_selector"android:divider="#cccccc"android:dividerHeight="0.5dp"/><TextViewandroid:layout_width="fill_parent"android:layout_height="32dp"android:layout_marginLeft="2dp"android:text="全国"android:textSize="16sp"android:gravity="center_vertical"android:textColor="@color/font_color"android:background="#f0f3f5"/><ExpandableListViewandroid:id="@+id/allcitylist"android:layout_width="fill_parent"android:cacheColorHint="#00000000"android:scrollingCache="false"android:alwaysDrawnWithCache="false"android:layout_height="fill_parent"android:scrollbars="none"android:divider="#cccccc"android:listSelector="@drawable/item_selector"android:dividerHeight="0.5dp"android:childDivider="@drawable/item_divider"/></LinearLayout><LinearLayoutxmlns:android="http://schemas.android.com/apk/res/android"android:id="@+id/localmap_layout"android:layout_width="match_parent"android:layout_height="match_parent"android:orientation="vertical" ><TextView android:layout_width="match_parent"android:layout_height="32dp"android:text="正在下载中"android:layout_marginLeft="2dp"android:textSize="16sp"android:gravity="center_vertical"android:textColor="@color/font_color"android:background="#f0f3f5"/><ListView android:layout_width="match_parent" android:layout_height="wrap_content"android:id="@+id/lodinglist"  android:cacheColorHint="#00000000"android:scrollingCache="false" android:divider="#cccccc"android:dividerHeight="0.5dp"></ListView><View android:layout_width="match_parent" android:layout_height="40dp" android:background="#fff"></View><TextViewandroid:layout_width="fill_parent"android:layout_height="32dp"android:text="已下载城市 "android:layout_marginLeft="2dp"android:textSize="16sp"android:gravity="center_vertical"android:textColor="@color/font_color"android:background="#f0f3f5"/><ListViewandroid:id="@+id/localmaplist"android:layout_width="fill_parent"android:layout_height="wrap_content"android:cacheColorHint="#00000000"android:scrollingCache="false"android:divider="#cccccc"android:dividerHeight="0.5dp"/></LinearLayout></LinearLayout>

CityExpandableListAdapter类

public class CityExpandableListAdapter extends BaseExpandableListAdapter {private OfflineActivity context;private ArrayList<MKOLSearchRecord> records;private HashMap<String, Boolean> hashMap;public CityExpandableListAdapter(OfflineActivity context, ArrayList<MKOLSearchRecord> records, HashMap<String, Boolean> hashMap){this.context = context;this.records = records;this.hashMap = hashMap;System.out.println("hashMapsize:"+hashMap.size());}@Overridepublic int getGroupCount() {return records.size();}@Overridepublic int getChildrenCount(int groupPosition) {if (records.get(groupPosition).childCities != null){return records.get(groupPosition).childCities.size();}return 0;}@Overridepublic Object getGroup(int groupPosition) {return records.get(groupPosition);}@Overridepublic Object getChild(int groupPosition, int childPosition) {if (records.get(groupPosition).childCities != null){return records.get(groupPosition).childCities.get(childPosition);}return null;}@Overridepublic long getGroupId(int groupPosition) {return groupPosition;}@Overridepublic long getChildId(int groupPosition, int childPosition) {return childPosition;}@Overridepublic boolean hasStableIds() {return true;}@Overridepublic View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) {GroupHolder groupHolder = null;if (convertView == null){convertView = LayoutInflater.from(context).inflate(R.layout.expandlist_group, parent, false);groupHolder = new GroupHolder();groupHolder.txt = (TextView)convertView.findViewById(R.id.names);groupHolder.size = (TextView)convertView.findViewById(R.id.map_size);groupHolder.img = (ImageView)convertView.findViewById(R.id.indicator_arrow);convertView.setTag(groupHolder);}else{groupHolder = (GroupHolder)convertView.getTag();}String cityName = records.get(groupPosition).cityName;groupHolder.txt.setText(cityName);if (records.get(groupPosition).childCities == null){groupHolder.img.setVisibility(View.GONE);groupHolder.size.setVisibility(View.VISIBLE);if (hashMap.get(cityName)){groupHolder.size.setText("已下载");}else {if ("1".equals(context.clickMap.get(cityName))){groupHolder.size.setText("正在下载");}else {groupHolder.size.setText(context.formatDataSize(records.get(groupPosition).size));}}}else {groupHolder.size.setVisibility(View.GONE);groupHolder.img.setVisibility(View.VISIBLE);}//判断isExpanded就可以控制是按下还是关闭，同时更换图片if(isExpanded){groupHolder.img.setBackgroundResource(R.drawable.moreitems_arrow);}else{groupHolder.img.setBackgroundResource(R.drawable.moreitems_arrow_down); }return convertView;}@Overridepublic View getChildView(int groupPosition, int childPosition, boolean isLastChild, View convertView, ViewGroup parent) {ItemHolder itemHolder = null;if (convertView == null){
//            convertView = convertView.inflate(context, R.layout.expandlist_item, null);convertView = LayoutInflater.from(context).inflate(R.layout.expandlist_item, parent,false);itemHolder = new ItemHolder();itemHolder.txt = (TextView)convertView.findViewById(R.id.child_names);itemHolder.size  = (TextView)convertView.findViewById(R.id.child_size);
//            itemHolder.img = (ImageView)convertView.findViewById(R.id.img);convertView.setTag(itemHolder);}else{itemHolder = (ItemHolder)convertView.getTag();}if (records.get(groupPosition).childCities != null){ArrayList<MKOLSearchRecord> list = records.get(groupPosition).childCities;if (list.size()>0){MKOLSearchRecord info = list.get(childPosition);String cityName  = info.cityName;itemHolder.txt.setText(cityName);if (hashMap.get(cityName)){itemHolder.size.setText("已下载");}else {itemHolder.size.setText(context.formatDataSize(info.size));}}}return convertView;}@Overridepublic boolean isChildSelectable(int groupPosition, int childPosition) {return true;}class GroupHolder{public TextView txt;public TextView size;public ImageView img;}class ItemHolder{public ImageView img;public TextView size;public TextView txt;}}

3、遇到的问题

关于ExpandableListview

在setOnGroupClickListener中修改group上TextView的文字时无效;
View child = ((ViewGroup)v).getChildAt(1);
((TextView)child).setText(“正在下载”)
这样设置没有效果，但是在setOnChildClickListener上做类似的修改是有效的，这里在点击group时，好像setOnGroupClickListener去调用了adapter的notifyDataSetChanged()，但是在程序中没找到，难道这是默认行为？
最后还是通过下面的方法解决
clickMap.put(record.cityName, “1”);
adapter.notifyDataSetChanged();
通过修改数据，然后调用adapter.notifyDataSetChanged();在adapter中进行修改;

在item根部局上设置minHeight属性可以有效的设置item的高度。

LayoutInflater类的infalter方法，几种重载方法的区别：

之前对这个有所了解，这里碰到的时候又忘记了，再次记录下。
1. 如果root为null，attachToRoot将失去作用，设置任何值都没有意义。
2. 如果root不为null，attachToRoot设为true，则会给加载的布局文件的指定一个父布局，即root。
3. 如果root不为null，attachToRoot设为false，则会将布局文件最外层的所有layout属性进行设置，当该view被添加到父view当中时，这些layout属性会自动生效。
4. 在不设置attachToRoot参数的情况下，如果root不为null，attachToRoot参数默认为true。
具体这篇文件解释很清楚：http://blog.csdn.net/guolin_blog/article/details/12921889