1
.需要在 http://developer
.baidu
.com/ 注册开发者
(个人或公司)账号
2
.需要申请Key
打开网址 http://developer
.baidu
.com/map/index
.php
点击 创建应用,跟流程创建应用app
3
.点击相关下载->一键下载
4
.调用
百度地图的APP 需要在 AndroidManifest
.xml 添加
<application
android:name="baidumapsdk
.demo
.DemoApplication"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name" >
这里需要添加key,创建应用后，会有这个key
<meta-data
android:name="com
.baidu
.lbsapi
.API_KEY"
android:value="6t2yuIFylnRG7ECj1xHYuelY" />
.....
package com
.obtk
.mapdemo;
import com
.baidu
.location
.BDLocation;
import com
.baidu
.location
.BDLocationListener;
import com
.baidu
.location
.LocationClient;
import com
.baidu
.location
.LocationClientOption;
import com
.baidu
.mapapi
.SDKInitializer;
import com
.baidu
.mapapi
.map
.BaiduMap;
import com
.baidu
.mapapi
.map
.BaiduMapOptions;
import com
.baidu
.mapapi
.map
.MapStatusUpdate;
import com
.baidu
.mapapi
.map
.MapStatusUpdateFactory;
import com
.baidu
.mapapi
.map
.MapView;
import com
.baidu
.mapapi
.map
.MyLocationData;
import com
.baidu
.mapapi
.map
.MyLocationConfiguration
.LocationMode;
import com
.baidu
.mapapi
.model
.LatLng;
import com
.baidu
.mapapi
.search
.core
.SearchResult;
import com
.baidu
.mapapi
.search
.geocode
.GeoCodeResult;
import com
.baidu
.mapapi
.search
.geocode
.GeoCoder;
import com
.baidu
.mapapi
.search
.geocode
.OnGetGeoCoderResultListener;
import com
.baidu
.mapapi
.search
.geocode
.ReverseGeoCodeOption;
import com
.baidu
.mapapi
.search
.geocode
.ReverseGeoCodeResult;
import android
.os
.Bundle;
import android
.util
.Log;
import android
.view
.Menu;
import android
.view
.View;
import android
.view
.View
.OnClickListener;
import android
.widget
.Button;
import android
.widget
.RelativeLayout;
import android
.widget
.Toast;
import android
.app
.Activity;
import com
.obtk
.mapdemo
.R;
public class MapApiDemoActivity extends Activity implements
OnGetGeoCoderResultListener {
private MapView mMapView = null;
private BaiduMap
mBaiduMap = null;
private GeoCoder mSearch = null;
@Override
protected void onCreate
(Bundle savedInstanceState) {
super
.onCreate
(savedInstanceState
);
// SDK初始化
SDKInitializer
.initialize
(getApplicationContext
()
);
//当前视图
setContentView
(R
.layout
.activity_map_api_demo
);
//创建地图对象
init
();
final Button btn_location =
(Button) findViewById
(R
.id
.btn_location
);
btn_location
.setOnClickListener
(new OnClickListener
() {
@Override
public void onClick
(View arg0) {
// TODO Auto-generated method stub
getLocation
();
btn_location
.setEnabled
(false
);
}
}
);
}
@Override
public boolean onCreateOptionsMenu
(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present
.
getMenuInflater
()
.inflate
(R
.menu
.activity_map_api_demo, menu
);
return true;
}
/**
* 初始化方法
*/
private void init
() {
//mMapView =
(MapView) findViewById
(R
.id
.bmapview
);
mMapView = new MapView
(this, new BaiduMapOptions
()
);
mBaiduMap = mMapView
.getMap
();
/**添加一个对象*/
RelativeLayout rlly_map =
(RelativeLayout)findViewById
(R
.id
.rlly_map
);
rlly_map
.addView
(mMapView
);
// 开启定位图层
mBaiduMap.setMyLocationEnabled
(true
);
//初始化搜索模块，注册事件监听
mSearch = GeoCoder
.newInstance
();
mSearch
.setOnGetGeoCodeResultListener
(this
);
}
@Override
protected void onResume
() {
super
.onResume
();
mMapView
.onResume
();
}
@Override
protected void onPause
() {
super
.onPause
();
mMapView
.onPause
();
}
@Override
protected void onDestroy
() {
// 退出时销毁定位
mLocClient
.stop
();
// 关闭定位图层
mBaiduMap.setMyLocationEnabled
(false
);
mMapView
.onDestroy
();
mMapView = null;
super
.onDestroy
();
}
// 定位相关
LocationClient mLocClient;
public MyLocationListenner myListener = new MyLocationListenner
();
private LocationMode mCurrentMode;
private boolean isFirstLoc = true;
/**
* 定位SDK监听函数
*/
public class MyLocationListenner implements BDLocationListener {
@Override
public void onReceiveLocation
(BDLocation location) {
// map view 销毁后不在处理新接收的位置
if
(location == null || mMapView == null)
return;
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
();
mBaiduMap.setMyLocationData
(locData
);
if
(isFirstLoc) {
isFirstLoc = false;
LatLng ll = new LatLng
(location
.getLatitude
(),
location
.getLongitude
()
);
MapStatusUpdate u = MapStatusUpdateFactory
.newLatLng
(ll
);
mBaiduMap.animateMapStatus(u
);
}
String addr = location
.getAddrStr
();
if
(addr != null) {
Log
.i
("Test", addr
);
} else {
Log
.i
("Test","error"
);
}
double longitude = location
.getLongitude
();
double latitude = location
.getLatitude
();
if
(longitude > 0 && latitude > 0) {
Log
.i
("Test",String
.format
("纬度:%f 经度:%f", latitude,longitude)
);
LatLng ptCenter = new LatLng
(latitude,longitude
);
// 反Geo搜索
mSearch
.reverseGeoCode
(new ReverseGeoCodeOption
()
.location
(ptCenter)
);
}
//停止定位
mLocClient
.stop
();
}
public void onReceivePoi
(BDLocation poiLocation) {
}
}
private void getLocation
() {
// 定位初始化
mLocClient = new LocationClient
(this
);
mLocClient
.registerLocationListener
(myListener
);
LocationClientOption option = new LocationClientOption
();
option
.setOpenGps
(true
);//打开gps
option
.setCoorType
("bd09ll"
); //设置坐标类型
option
.setScanSpan
(5000
); //定位时间间隔
mLocClient
.setLocOption
(option
);
mLocClient
.start
();
}
@Override
public void onGetGeoCodeResult
(GeoCodeResult arg0) {
// TODO Auto-generated method stub
}
@Override
public void onGetReverseGeoCodeResult
(ReverseGeoCodeResult result) {
// TODO Auto-generated method stub
if
(result == null || result
.error != SearchResult
.ERRORNO
.NO_ERROR) {
Toast
.makeText
(MapApiDemoActivity
.this, "抱歉，未能找到结果", Toast
.LENGTH_LONG)
.show
();
return;
}
mBaiduMap.clear
();
//
mBaiduMap.addOverlay
(new MarkerOptions
()
.position
(result
.getLocation
())
//
.icon
(BitmapDescriptorFactory
//
.fromResource
(R
.drawable
.icon_marka))
);
mBaiduMap.setMapStatus
(MapStatusUpdateFactory
.newLatLng
(result
.getLocation
())
);
Toast
.makeText
(MapApiDemoActivity
.this, result
.getAddress
(),
Toast
.LENGTH_LONG)
.show
();
String province = result
.getAddressDetail
()
.province;
String city = result
.getAddressDetail
()
.city;
if
(province != null && city != null) {
}
}
}
本文记录了在集成百度地图LBS云检索功能过程中遇到的一个NullPointerException问题及其解决方案。错误出现在尝试更新地图状态时，原因是经纬度顺序错误。
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