百度地图之离线下载功能
百度SDK中提供了离线下载功能，这样在有网络的时候可以把地图下载下来，那么以后在无网的时候就可以使用地图功能了，百度Demo代码如下:
OffLineActivity：
package com.home;
import java.util.ArrayList;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.BaseAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.LinearLayout;
import android.widget.ListAdapter;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;
import com.baidu.mapapi.BMapManager;
import com.baidu.mapapi.map.MKOLSearchRecord;
import com.baidu.mapapi.map.MKOLUpdateElement;
import com.baidu.mapapi.map.MKOfflineMap;
import com.baidu.mapapi.map.MKOfflineMapListener;
import com.baidu.mapapi.map.MapController;
import com.baidu.mapapi.map.MapView;
public class OffLineActivity extends Activity implements MKOfflineMapListener {
private MapView mMapView = null;
private MKOfflineMap mOffline = null;
private TextView cidView;
private TextView stateView;
private EditText cityNameView;
private MapController mMapController = null;
/**
* 已下载的离线地图信息列表
*/
private ArrayList<MKOLUpdateElement> localMapList = null;
private LocalMapAdapter lAdapter = null;
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
DemoApplication app = (DemoApplication) this.getApplication();
if (app.mBMapManager == null) {
app.mBMapManager = new BMapManager(this);
app.mBMapManager.init(DemoApplication.strKey,
new DemoApplication.MyGeneralListener());
}
setContentView(R.layout.activity_offline);
mMapView = new MapView(this);
mMapController = mMapView.getController();
mOffline = new MKOfflineMap();
/**
* 初始化离线地图模块,MapControler可从MapView.getController()获取
*/
mOffline.init(mMapController, this);
initView();
}
private void initView() {
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);
ArrayList<String> hotCities = new ArrayList<String>();
// 获取热门城市列表
ArrayList<MKOLSearchRecord> records1 = mOffline.getHotCityList();
if (records1 != null) {
for (MKOLSearchRecord r : records1) {
hotCities.add(r.cityName + "(" + r.cityID + ")" + " --"
+ this.formatDataSize(r.size));
}
}
ListAdapter hAdapter = (ListAdapter) new ArrayAdapter<String>(this,
android.R.layout.simple_list_item_1, hotCities);
hotCityList.setAdapter(hAdapter);
ListView allCityList = (ListView) findViewById(R.id.allcitylist);
// 获取所有支持离线地图的城市
ArrayList<String> allCities = new ArrayList<String>();
ArrayList<MKOLSearchRecord> records2 = mOffline.getOfflineCityList();
if (records1 != null) {
for (MKOLSearchRecord r : records2) {
allCities.add(r.cityName + "(" + r.cityID + ")" + " --"
+ this.formatDataSize(r.size));
}
}
ListAdapter aAdapter = (ListAdapter) new ArrayAdapter<String>(this,
android.R.layout.simple_list_item_1, allCities);
allCityList.setAdapter(aAdapter);
LinearLayout cl = (LinearLayout) findViewById(R.id.citylist_layout);
LinearLayout lm = (LinearLayout) findViewById(R.id.localmap_layout);
lm.setVisibility(View.GONE);
cl.setVisibility(View.VISIBLE);
// 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);
}
/**
* 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);
}
/**
* 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);
}
/**
* 搜索离线城市
*
* @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));
}
/**
* 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();
}
/**
* 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();
}
/**
* 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();
}
/**
* 从SD卡导入离线地图安装包
*
* @param view
*/
public void importFromSDCard(View view) {
int num = mOffline.scan();
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();
}
/**
* 更新状态显示
*/
public void updateView() {
localMapList = mOffline.getAllUpdateInfo();
if (localMapList == null) {
localMapList = new ArrayList<MKOLUpdateElement>();
}
lAdapter.notifyDataSetChanged();
}
@Override
protected void onPause() {
int cityid = Integer.parseInt(cidView.getText().toString());
mOffline.pause(cityid);
mMapView.onPause();
super.onPause();
}
@Override
protected void onResume() {
mMapView.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;
}
@Override
protected void onDestroy() {
/**
* 退出时，销毁离线地图模块
*/
mOffline.destroy();
mMapView.destroy();
super.onDestroy();
}
@Override
public 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;
}
}
/**
* 离线地图管理列表适配器
*/
public class LocalMapAdapter extends BaseAdapter {
@Override
public int getCount() {
return localMapList.size();
}
@Override
public Object getItem(int index) {
return localMapList.get(index);
}
@Override
public long getItemId(int index) {
return index;
}
@Override
public 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() {
@Override
public void onClick(View arg0) {
mOffline.remove(e.cityID);
updateView();
}
});
display.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent();
intent.putExtra("x", e.geoPt.getLongitudeE6());
intent.putExtra("y", e.geoPt.getLatitudeE6());
intent.setClass(OffLineActivity.this,
BaseMapDemoActivity.class);
startActivity(intent);
}
});
}
}
}
BaseMapDemoActivity：
package com.home;
import android.app.Activity;
import android.content.Intent;
import android.graphics.Bitmap;
import android.os.Bundle;
import android.widget.Toast;
import com.baidu.mapapi.BMapManager;
import com.baidu.mapapi.map.MKMapViewListener;
import com.baidu.mapapi.map.MapController;
import com.baidu.mapapi.map.MapPoi;
import com.baidu.mapapi.map.MapView;
import com.baidu.platform.comapi.basestruct.GeoPoint;
/**
* 演示MapView的基本用法
*/
public class BaseMapDemoActivity extends Activity {
final static String TAG = "MainActivity";
/**
* MapView 是地图主控件
*/
private MapView mMapView = null;
/**
* 用MapController完成地图控制
*/
private MapController mMapController = null;
/**
* MKMapViewListener 用于处理地图事件回调
*/
MKMapViewListener mMapListener = null;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
/**
* 使用地图sdk前需先初始化BMapManager. BMapManager是全局的，可为多个MapView共用，它需要地图模块创建前创建，
* 并在地图地图模块销毁后销毁，只要还有地图模块在使用，BMapManager就不应该销毁
*/
DemoApplication app = (DemoApplication) this.getApplication();
if (app.mBMapManager == null) {
app.mBMapManager = new BMapManager(this);
/**
* 如果BMapManager没有初始化则初始化BMapManager
*/
app.mBMapManager.init(DemoApplication.strKey,
new DemoApplication.MyGeneralListener());
}
/**
* 由于MapView在setContentView()中初始化,所以它需要在BMapManager初始化之后
*/
setContentView(R.layout.activity_main);
mMapView = (MapView) findViewById(R.id.bmapView);
/**
* 获取地图控制器
*/
mMapController = mMapView.getController();
/**
* 设置地图是否响应点击事件 .
*/
mMapController.enableClick(true);
/**
* 设置地图缩放级别
*/
mMapController.setZoom(12);
/**
* 将地图移动至指定点
* 使用百度经纬度坐标，可以通过http://api.map.baidu.com/lbsapi/getpoint/index
* .html查询地理坐标 如果需要在百度地图上显示使用其他坐标系统的位置，请发邮件至[email protected]申请坐标转换接口
*/
GeoPoint p;
double cLat = 39.945;
double cLon = 116.404;
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();
p = new GeoPoint(b.getInt("y"), b.getInt("x"));
} else {
// 设置中心点为天安门
p = new GeoPoint((int) (cLat * 1E6), (int) (cLon * 1E6));
}
mMapController.setCenter(p);
/**
* MapView的生命周期与Activity同步，当activity挂起时需调用MapView.onPause()
*/
mMapListener = new MKMapViewListener() {
@Override
public void onMapMoveFinish() {
/**
* 在此处理地图移动完成回调 缩放，平移等操作完成后，此回调被触发
*/
}
@Override
public void onClickMapPoi(MapPoi mapPoiInfo) {
/**
* 在此处理底图poi点击事件 显示底图poi名称并移动至该点 设置过：
* mMapController.enableClick(true); 时，此回调才能被触发
*
*/
String title = "";
if (mapPoiInfo != null) {
title = mapPoiInfo.strText;
Toast.makeText(BaseMapDemoActivity.this, title,
Toast.LENGTH_SHORT).show();
mMapController.animateTo(mapPoiInfo.geoPt);
}
}
@Override
public void onGetCurrentMap(Bitmap b) {
/**
* 当调用过 mMapView.getCurrentMap()后，此回调会被触发 可在此保存截图至存储设备
*/
}
@Override
public void onMapAnimationFinish() {
/**
* 地图完成带动画的操作（如: animationTo()）后，此回调被触发
*/
}
/**
* 在此处理地图加载完成事件
*/
@Override
public void onMapLoadFinish() {
Toast.makeText(BaseMapDemoActivity.this, "地图加载完成",
Toast.LENGTH_SHORT).show();
}
};
mMapView.regMapViewListener(DemoApplication.getInstance().mBMapManager,
mMapListener);
}
@Override
protected void onPause() {
/**
* MapView的生命周期与Activity同步，当activity挂起时需调用MapView.onPause()
*/
mMapView.onPause();
super.onPause();
}
@Override
protected void onResume() {
/**
* MapView的生命周期与Activity同步，当activity恢复时需调用MapView.onResume()
*/
mMapView.onResume();
super.onResume();
}
@Override
protected void onDestroy() {
/**
* MapView的生命周期与Activity同步，当activity销毁时需调用MapView.destroy()
*/
mMapView.destroy();
super.onDestroy();
}
@Override
protected void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
mMapView.onSaveInstanceState(outState);
}
@Override
protected void onRestoreInstanceState(Bundle savedInstanceState) {
super.onRestoreInstanceState(savedInstanceState);
mMapView.onRestoreInstanceState(savedInstanceState);
}
}
activity_offline：
<?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" >
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="50dip"
android:orientation="horizontal" >
<TextView
android:id="@+id/cityid"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="131" />
<!-- 隐藏输入法用 -->
<LinearLayout
android:layout_width="0px"
android:layout_height="0px"
android:focusable="true"
android:focusableInTouchMode="true" />
<EditText
android:id="@+id/city"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="北京" />
<Button
android:id="@+id/search"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:background="@drawable/button_style"
android:onClick="search"
android:text="搜索" />
<Button
android:id="@+id/scan"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:background="@drawable/button_style"
android:onClick="importFromSDCard"
android:text="导入" />
</LinearLayout>
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="50dip"
android:orientation="horizontal" >
<TextView
android:id="@+id/state"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="已下载:--" />
<Button
android:id="@+id/start"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:background="@drawable/button_style"
android:onClick="start"
android:text="开始" />
<Button
android:id="@+id/stop"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:background="@drawable/button_style"
android:onClick="stop"
android:text="暂停" />
<Button
android:id="@+id/del"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:background="@drawable/button_style"
android:onClick="remove"
android:text="删除" />
</LinearLayout>
<LinearLayout
android:id="@+id/city_list"
android:layout_width="match_parent"
android:layout_height="50dip"
android:orientation="horizontal" >
<Button
android:id="@+id/clButton"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:background="@drawable/button_style"
android:onClick="clickCityListButton"
android:text="城市列表" />
<Button
android:id="@+id/localButton"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:background="@drawable/button_style"
android:onClick="clickLocalMapListButton"
android:text="下载管理" />
</LinearLayout>
<LinearLayout
android:id="@+id/citylist_layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="热门城市" />
<ListView
android:id="@+id/hotcitylist"
android:layout_width="fill_parent"
android:layout_height="200dip" />
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="全国" />
<ListView
android:id="@+id/allcitylist"
android:layout_width="fill_parent"
android:layout_height="fill_parent" />
</LinearLayout>
<LinearLayout
android:id="@+id/localmap_layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="已下载城市 " />
<ListView
android:id="@+id/localmaplist"
android:layout_width="fill_parent"
android:layout_height="wrap_content" />
</LinearLayout>
</LinearLayout>
offline_localmap_list：
<?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="horizontal"
android:padding="10dip" >
<TextView
android:id="@+id/title"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="已下载城市 " />
<TextView
android:id="@+id/update"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text=""
android:textColor="#FF0000" />
<TextView
android:id="@+id/ratio"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="" />
<Button
android:id="@+id/display"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:background="@drawable/button_style"
android:text="查看" />
<Button
android:id="@+id/remove"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:background="@drawable/button_style"
android:text="删除" />
</LinearLayout>
activity_main：
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<com.baidu.mapapi.map.MapView
android:id="@+id/bmapView"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:clickable="true" />
</LinearLayout>
配置文件及Application类同之前一样。
附上图片效果：
