百度SDK中提供了離線下載功能，這樣在有網(wǎng)絡(luò)的時(shí)候可以把地圖下載下來，那么以后在無網(wǎng)的時(shí)候就可以使用地圖功能了，百度Demo代碼如下:

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;

/**

* 已下載的離線地圖信息列表

*/

private ArrayList 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();

/**

* 初始化離線地圖模塊,MapControler可從MapView.getController()獲取

*/

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 hotCities = new ArrayList();

// 獲取熱門城市列表

ArrayList 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(this,

android.R.layout.simple_list_item_1, hotCities);

hotCityList.setAdapter(hAdapter);

ListView allCityList = (ListView) findViewById(R.id.allcitylist);

// 獲取所有支持離線地圖的城市

ArrayList allCities = new ArrayList();

ArrayList 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(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);

// 獲取已下過的離線地圖信息

localMapList = mOffline.getAllUpdateInfo();

if (localMapList == null) {

localMapList = new ArrayList();

}

ListView localMapListView = (ListView) findViewById(R.id.localmaplist);

lAdapter = new LocalMapAdapter();

localMapListView.setAdapter(lAdapter);

}

/**

* 切換至城市列表

*

* @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);

}

/**

* 切換至下載管理列表

*

* @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);

}

/**

* 搜索離線城市

*

* @param view

*/

public void search(View view) {

ArrayList records = mOffline.searchCity(cityNameView

.getText().toString());

if (records == null || records.size() != 1)

return;

cidView.setText(String.valueOf(records.get(0).cityID));

}

/**

* 開始下載

*

* @param view

*/

public void start(View view) {

int cityid = Integer.parseInt(cidView.getText().toString());

mOffline.start(cityid);

clickLocalMapListButton(null);

Toast.makeText(this, "開始下載離線地圖. cityid: " + cityid, Toast.LENGTH_SHORT)

.show();

}

/**

* 暫停下載

*

* @param view

*/

public void stop(View view) {

int cityid = Integer.parseInt(cidView.getText().toString());

mOffline.pause(cityid);

Toast.makeText(this, "暫停下載離線地圖. cityid: " + cityid, Toast.LENGTH_SHORT)

.show();

}

/**

* 刪除離線地圖

*

* @param view

*/

public void remove(View view) {

int cityid = Integer.parseInt(cidView.getText().toString());

mOffline.remove(cityid);

Toast.makeText(this, "刪除離線地圖. cityid: " + cityid, Toast.LENGTH_SHORT)

.show();

}

/**

* 從SD卡導(dǎo)入離線地圖安裝包

*

* @param view

*/

public void importFromSDCard(View view) {

int num = mOffline.scan();

String msg = "";

if (num == 0) {

msg = "沒有導(dǎo)入離線包，這可能是離線包放置位置不正確，或離線包已經(jīng)導(dǎo)入過";

} else {

msg = String.format("成功導(dǎo)入 %d 個(gè)離線包，可以在下載管理查看", num);

}

Toast.makeText(this, msg, Toast.LENGTH_SHORT).show();

}

/**

* 更新狀態(tài)顯示

*/

public void updateView() {

localMapList = mOffline.getAllUpdateInfo();

if (localMapList == null) {

localMapList = new ArrayList();

}

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() {

/**

* 退出時(shí)，銷毀離線地圖模塊

*/

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);

// 處理下載進(jìn)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:

// 有新離線地圖安裝

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;

}

}

/**

* 離線地圖管理列表適配器

*/

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 是地圖主控件

*/

private MapView mMapView = null;

/**

* 用MapController完成地圖控制

*/

private MapController mMapController = null;

/**

* MKMapViewListener 用于處理地圖事件回調(diào)

*/

MKMapViewListener mMapListener = null;

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

/**

* 使用地圖sdk前需先初始化BMapManager. BMapManager是全局的，可為多個(gè)MapView共用，它需要地圖模塊創(chuàng)建前創(chuàng)建，

* 并在地圖地圖模塊銷毀后銷毀，只要還有地圖模塊在使用，BMapManager就不應(yīng)該銷毀

*/

DemoApplication app = (DemoApplication) this.getApplication();

if (app.mBMapManager == null) {

app.mBMapManager = new BMapManager(this);

/**

* 如果BMapManager沒有初始化則初始化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);

/**

* 獲取地圖控制器

*/

mMapController = mMapView.getController();

/**

* 設(shè)置地圖是否響應(yīng)點(diǎn)擊事件 .

*/

mMapController.enableClick(true);

/**

* 設(shè)置地圖縮放級(jí)別

*/

mMapController.setZoom(12);

/**

* 將地圖移動(dòng)至指定點(diǎn)

* 使用百度經(jīng)緯度坐標(biāo)，可以通過http://api.map.baidu.com/lbsapi/getpoint/index

* .html查詢地理坐標(biāo) 如果需要在百度地圖上顯示使用其他坐標(biāo)系統(tǒng)的位置，請(qǐng)發(fā)郵件至mapapi@baidu.com申請(qǐng)坐標(biāo)轉(zhuǎn)換接口

*/

GeoPoint p;

double cLat = 39.945;

double cLon = 116.404;

Intent intent = getIntent();

if (intent.hasExtra("x") && intent.hasExtra("y")) {

// 當(dāng)用intent參數(shù)時(shí)，設(shè)置中心點(diǎn)為指定點(diǎn)

Bundle b = intent.getExtras();

p = new GeoPoint(b.getInt("y"), b.getInt("x"));

} else {

// 設(shè)置中心點(diǎn)為天安門

p = new GeoPoint((int) (cLat * 1E6), (int) (cLon * 1E6));

}

mMapController.setCenter(p);

/**

* MapView的生命周期與Activity同步，當(dāng)activity掛起時(shí)需調(diào)用MapView.onPause()

*/

mMapListener = new MKMapViewListener() {

@Override

public void onMapMoveFinish() {

/**

* 在此處理地圖移動(dòng)完成回調(diào) 縮放，平移等操作完成后，此回調(diào)被觸發(fā)

*/

}

@Override

public void onClickMapPoi(MapPoi mapPoiInfo) {

/**

* 在此處理底圖poi點(diǎn)擊事件 顯示底圖poi名稱并移動(dòng)至該點(diǎn) 設(shè)置過：

* mMapController.enableClick(true); 時(shí)，此回調(diào)才能被觸發(fā)

*

*/

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) {

/**

* 當(dāng)調(diào)用過 mMapView.getCurrentMap()后，此回調(diào)會(huì)被觸發(fā) 可在此保存截圖至存儲(chǔ)設(shè)備

*/

}

@Override

public void onMapAnimationFinish() {

/**

* 地圖完成帶動(dòng)畫的操作(如: animationTo())后，此回調(diào)被觸發(fā)

*/

}

/**

* 在此處理地圖加載完成事件

*/

@Override

public void onMapLoadFinish() {

Toast.makeText(BaseMapDemoActivity.this, "地圖加載完成",

Toast.LENGTH_SHORT).show();

}

};

mMapView.regMapViewListener(DemoApplication.getInstance().mBMapManager,

mMapListener);

}

@Override

protected void onPause() {

/**

* MapView的生命周期與Activity同步，當(dāng)activity掛起時(shí)需調(diào)用MapView.onPause()

*/

mMapView.onPause();

super.onPause();

}

@Override

protected void onResume() {

/**

* MapView的生命周期與Activity同步，當(dāng)activity恢復(fù)時(shí)需調(diào)用MapView.onResume()

*/

mMapView.onResume();

super.onResume();

}

@Override

protected void onDestroy() {

/**

* MapView的生命周期與Activity同步，當(dāng)activity銷毀時(shí)需調(diào)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：

android:layout_width="match_parent"

android:layout_height="match_parent"

android:orientation="vertical" >

android:layout_width="fill_parent"

android:layout_height="50dip"

android:orientation="horizontal" >

android:id="@+id/cityid"

android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:layout_weight="1"

android:text="131" />

android:layout_width="0px"

android:layout_height="0px"

android:focusable="true"

android:focusableInTouchMode="true" />

android:id="@+id/city"

android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:layout_weight="1"

android:text="北京" />

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" />

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="導(dǎo)入" />

android:layout_width="fill_parent"

android:layout_height="50dip"

android:orientation="horizontal" >

android:id="@+id/state"

android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:layout_weight="1"

android:text="已下載:--" />

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="開始" />

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="暫停" />

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="刪除" />

android:id="@+id/city_list"

android:layout_width="match_parent"

android:layout_height="50dip"

android:orientation="horizontal" >

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" />

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="下載管理" />

android:id="@+id/citylist_layout"

android:layout_width="match_parent"

android:layout_height="match_parent"

android:orientation="vertical" >

android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:text="熱門城市" />

android:id="@+id/hotcitylist"

android:layout_width="fill_parent"

android:layout_height="200dip" />

android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:text="全國(guó)" />

android:id="@+id/allcitylist"

android:layout_width="fill_parent"

android:layout_height="fill_parent" />

android:id="@+id/localmap_layout"

android:layout_width="match_parent"

android:layout_height="match_parent"

android:orientation="vertical" >

android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:text="已下載城市 " />

android:id="@+id/localmaplist"

android:layout_width="fill_parent"

android:layout_height="wrap_content" />

offline_localmap_list：

android:layout_width="match_parent"

android:layout_height="match_parent"

android:orientation="horizontal"

android:padding="10dip" >

android:id="@+id/title"

android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:layout_weight="1"

android:text="已下載城市 " />

android:id="@+id/update"

android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:layout_weight="1"

android:text=""

android:textColor="#FF0000" />

android:id="@+id/ratio"

android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:layout_weight="1"

android:text="" />

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" />

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="刪除" />

activity_main：

android:layout_width="fill_parent"

android:layout_height="fill_parent"

android:orientation="vertical" >

android:id="@+id/bmapView"

android:layout_width="fill_parent"

android:layout_height="fill_parent"

android:clickable="true" />

配置文件及Application類同之前一樣。

附上圖片效果：

總結(jié)

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