一、问题描述
LBS位置服务是android应用中重要的功能，应用越来越广泛，下面我们逐步学习和实现lbs相关的应用如定位、地图、导航等，首先我们看如何基于百度地图实现定位功能
二、配置环境
1、注册密钥：地址http://developer.baidu.com/map/
2、下载定位SDK，并导入SDK如图所示：
三、编写MyApplication类
编写MyApplication类，为了使用方便我们可以将实现定位的方法封装的Application组件中
封装下列方法
1、 获取定位信息——requestLocationInfo()
2、 通过广播发送位置信息——sendBroadCast()
3、 停止定位——stopLocationClient()
public class MyApplication extends Application{
public LocationClient mLocationClient = null;
public GeofenceClient mGeofenceClient;
public MyLocationListenner myListener = new MyLocationListenner();
public static String TAG = "MyApplication";
private static MyApplication mInstance = null;
@Override
public void onCreate(){
mInstance = this;
mLocationClient = new LocationClient(this);
/**
* 项目的key，自己到官网申请 http://lbsyun.baidu.com/apiconsole/key
*/
mLocationClient.setAK("你的应用Key");
mLocationClient.registerLocationListener(myListener);
mGeofenceClient = new GeofenceClient(this);
super.onCreate();
Log.d(TAG, "... Application onCreate... pid=" + Process.myPid());
}
public static MyApplication getInstance(){
return mInstance;
}
/**
* 停止定位
*/
public void stopLocationClient(){
if (mLocationClient != null && mLocationClient.isStarted()){
mLocationClient.stop();
}
}
/**
* 发起定位
*/
public void requestLocationInfo(){
setLocationOption();
if (mLocationClient != null && !mLocationClient.isStarted()){
mLocationClient.start();
}
if (mLocationClient != null && mLocationClient.isStarted()){
mLocationClient.requestLocation();
}
}
/**
* 设置百度地图的相关参数
*/
private void setLocationOption(){
LocationClientOption option = new LocationClientOption();
option.setOpenGps(true); // 打开gps
option.setCoorType("bd09ll"); // 设置坐标类型
option.setServiceName("com.baidu.location.service_v2.9");
option.setPoiExtraInfo(true);
option.setAddrType("all");
option.setPoiNumber(10);
option.disableCache(true);
mLocationClient.setLocOption(option);
}
/**
* 监听函数，有更新位置的时候，格式化成字符串，输出到屏幕中
*/
public class MyLocationListenner implements BDLocationListener
{
@Override
public void onReceiveLocation(BDLocation location){
if (location == null){
sendBroadCast("定位失败!");
return;
}
sendBroadCast(location.getAddrStr());
}
public void onReceivePoi(BDLocation poiLocation){
if (poiLocation == null){
sendBroadCast("定位失败!");
return;
}
sendBroadCast(poiLocation.getAddrStr());
}
}
/**
* 得到发送广播
* @param address
*/
public void sendBroadCast(String address){
stopLocationClient();
Intent intent = new Intent(MainActivity.LOCATION_BCR);
intent.putExtra("address", address);
sendBroadcast(intent);
}
}
三、 主程序MainActivity
public class MainActivity extends Activity{
public static String TAG = "LocTestDemo";
private BroadcastReceiver broadcastReceiver;
public static String LOCATION_BCR = "location_bcr";
private Button locBtn;
private TextView locInfo;
private MyApplication application;
@Override
protected void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
application=(MyApplication)super.getApplication();
initialize();
initializeViews();
initializeListeners();
}
private void initialize(){
registerBroadCastReceiver();//注册广播
}
private void initializeViews()
{
locBtn = (Button) findViewById(R.id.location);
locInfo = (TextView) findViewById(R.id.location_info);
}
private void initializeListeners()
{
locBtn.setOnClickListener(new OnClickListener(){
@Override
public void onClick(View v){
locInfo.setText("定位中...");
//调用请求定位信息
application.requestLocationInfo();
}
});
}
/**
* 注册一个广播，监听定位结果，接受广播获得地址信息
*/
private void registerBroadCastReceiver()
{
broadcastReceiver = new BroadcastReceiver(){
public void onReceive(Context context, Intent intent){
String address = intent.getStringExtra("address");
locInfo.setText(address);
}
};
IntentFilter intentToReceiveFilter = new IntentFilter();
intentToReceiveFilter.addAction(LOCATION_BCR);
registerReceiver(broadcastReceiver, intentToReceiveFilter);
}
@Override
protected void onDestroy(){
super.onDestroy();
unregisterReceiver(broadcastReceiver);
}
}
四、 AndroidManifest.xml配置信息
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.jereh.baidulocation"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="17" />
<application
android:name="com.jereh.baidulocation.MyApplication"
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name="com.jereh.baidulocation.MainActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<service
android:name="com.baidu.location.f"
android:enabled="true"
android:process=":remote" >
<intent-filter>
<action android:name="com.baidu.location.service_v2.2" >
</action>
</intent-filter>
</service>
</application>
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" >
</uses-permission>
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" >
</uses-permission>
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" >
</uses-permission>
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" >
</uses-permission>
<uses-permission android:name="android.permission.CHANGE_WIFI_STATE" >
</uses-permission>
<uses-permission android:name="android.permission.READ_PHONE_STATE" >
</uses-permission>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" >
</uses-permission>
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS" >
</uses-permission>
<uses-permission android:name="android.permission.READ_LOGS" >
</uses-permission>
<uses-permission android:name="android.permission.VIBRATE" />
<uses-permission android:name="android.permission.WAKE_LOCK" />
<uses-permission android:name="android.permission.WRITE_SETTINGS" />
</manifest>
