Android 百度地图 SDK v3_3_0 （三） ---离线地图

转发请标明出处：http://blog.csdn.net/tanzuai/article/details/43793455

本篇博客要实现的功能

                                       先上效果图：

                                                            

                                         

     下面我们来介绍怎么一一实现

   1、功能介绍

           对于官方开发指南对于离线地图的教程，提供了两种方案：

           第一，手动导入，先将从官网下载的离线包解压，把vmp文件夹拷入SD卡根目录下的BaiduMapSDK文件夹内。

           第二，接口下载方法如下：mOffline.start(cityid);还比较靠谱，我相信这是大家最喜欢的。

     

     2、百度地图离线相关API介绍

a 、类 MKOfflineMap 提供地图的下载，离线地图列表的获取，已下载地图的查询等

java.util.ArrayList<MKOLUpdateElement> getAllUpdateInfo() 返回各城市离线地图更新信息

java.util.ArrayList<MKOLSearchRecord> getHotCityList() 返回热门城市列表

java.util.ArrayList<MKOLSearchRecord> 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

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 init(MKOfflineMapListener listener) 初使化

boolean pause(int cityID) 暂停下载指定城市ID的离线地图

boolean remove(int cityID) 删除指定城市ID的离线地图

boolean start(int cityID) 启动下载指定城市ID的离线地图

void destroy()  销毁离线地图管理模块，不用时调用 

接口 MKOfflineMapListener 离线地图事件通知接口。

void onGetOfflineMapState(int type, int state)

类 MKOLUpdateElement 和 类 MKOLSearchRecord

基本就是包含一些cityName , cityId, size 等等

     3.实例介绍

         3.1 初始化布局控件

        /*** 初始化布局控件*/private void initOfflinelayout() {cidView = (TextView) findViewById(R.id.cityid);//城市idcityNameView = (EditText) findViewById(R.id.city);//城市名称stateView = (TextView) findViewById(R.id.state);//下载状态hotCityList = (ListView) findViewById(R.id.hotcitylist);//热门城市allCityList = (ListView) findViewById(R.id.allcitylist);//全国城市allcity = (LinearLayout) findViewById(R.id.citylist_layout);//全国城市总布局localcity = (LinearLayout) findViewById(R.id.localmap_layout);//已下载城市布局localMapListView = (ListView) findViewById(R.id.localmaplist);//已下载城市}

        3.2 初始化离线地图

	/*** 初始化离线地图*/private void initOfflineMap() {mOffline = new MKOfflineMap();mOffline.init(this);// 获取热闹城市records1 = mOffline.getHotCityList();if (records1 != null) {for (MKOLSearchRecord r : records1) {hotCities.add(r.cityName + "(" + r.cityID + ")" + "   --"+ this.formatDataSize(r.size));}}hAdapter = (ListAdapter) new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1, hotCities);hotCityList.setAdapter(hAdapter);// 获取所有支持离线地图的城市allCities = new ArrayList<String>();records2 = mOffline.getOfflineCityList();if (records1 != null) {for (MKOLSearchRecord r : records2) {allCities.add(r.cityName + "(" + r.cityID + ")" + "   --"+ this.formatDataSize(r.size));}}allAdapter = (ListAdapter) new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1, allCities);allCityList.setAdapter(allAdapter);allcity.setVisibility(View.VISIBLE);localcity.setVisibility(View.GONE);// 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);}

         3.3.初始化监听器

	@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));updateView();}}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;}}

         3.4配置适配器

	/*** 离线地图管理列表适配器*/public class LocalMapAdapter extends BaseAdapter {@Overridepublic int getCount() {return localMapList.size();}@Overridepublic Object getItem(int index) {return localMapList.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 display = (Button) view.findViewById(R.id.display);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);ratio.setText(e.ratio + "%");title.setText(e.cityName);if (e.update) {update.setText("可更新");} else {update.setText("最新");}if (e.ratio != 100) {display.setEnabled(false);} else {display.setEnabled(true);}remove.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View arg0) {mOffline.remove(e.cityID);updateView();}});display.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View v) {Intent intent = new Intent();intent.putExtra("x", e.geoPt.longitude);intent.putExtra("y", e.geoPt.latitude);intent.setClass(OfflineActivity.this, MainActivity.class);startActivity(intent);}});}}

         3.5下面就来实现每个功能的点击事件

	/*** 切换至城市列表* * @param view*/public void clickCityListButton(View view) {allcity = (LinearLayout) findViewById(R.id.citylist_layout);localcity = (LinearLayout) findViewById(R.id.localmap_layout);allcity.setVisibility(View.VISIBLE);localcity.setVisibility(View.GONE);}/*** 开始下载* * @param view*/public void start(View view) {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();}/*** 切换至下载管理列表* * @param view*/public void clickLocalMapListButton(View view) {allcity = (LinearLayout) findViewById(R.id.citylist_layout);localcity = (LinearLayout) findViewById(R.id.localmap_layout);allcity.setVisibility(View.GONE);localcity.setVisibility(View.VISIBLE);}/*** 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();}/*** 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();}/*** 搜索离线需市* * @param view*/public void search(View view) {ArrayList<MKOLSearchRecord> records = mOffline.searchCity(cityNameView.getText().toString());if (records == null || records.size() != 1)return;cidView.setText(String.valueOf(records.get(0).cityID));}/*** 从SD卡导入离线地图安装包* * @param view*/public void importFromSDCard(View view) {int num = mOffline.importOfflineData();String msg = "";if (num == 0) {msg = "没有导入离线包，这可能是离线包放置位置不正确，或离线包已经导入过";} else {msg = String.format("成功导入 %d 个离线包，可以在下载管理查看", num);}Toast.makeText(this, msg, Toast.LENGTH_SHORT).show();updateView();}

         3.6为了给手机省电，下面我们就把该起的起，该关的关

	@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();}@Overrideprotected void onDestroy() {/*** 退出时，销毁离线地图模块*/mOffline.destroy();super.onDestroy();}

         3.7还有就是之前显示地图页面要修改过来（可以参考 Android 百度地图 SDK v3_3_0 （一） --- 基本地图）

         Intent intent = getIntent();if (intent.hasExtra("x") && intent.hasExtra("y")) {// 当用intent参数时，设置中心点为指定点Bundle b = intent.getExtras();LatLng p = new LatLng(b.getDouble("y"), b.getDouble("x"));mMapView = new MapView(this,new BaiduMapOptions().mapStatus(new MapStatus.Builder().target(p).build()));} else {mMapView = new MapView(this, new BaiduMapOptions());}setContentView(mMapView);

          因为在离线下载页面改变了坐标位置（可以查看上面  3.4配置适配器的代码）

         好了！其实也是蛮简单的！看完这篇博客相信大家已经知道离线地图怎么实现了！还有更好的实现方法，大家可以到评论栏发表各自的评论！

         

         下面为源码下载地址：

                 源码下载地址