android 通过GPS获取用户地理位置并监听位置变化
LocationActivity.java
/* LocationActivity.java
* @author octobershiner
* 2011 7 22
* SE.HIT
* 一个演示定位用户的位置并且监听位置变化的代码
* */
package uni.location;
import android.app.Activity;
import android.content.Context;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.os.Vibrator;
import android.util.Log;
import android.widget.TextView;
public class LocationActivity extends Activity {
/** Called when the activity is first created. */
//创建lcoationManager对象
private LocationManager manager;
private static final String TAG = "LOCATION DEMO";
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
//获取系统的服务，
manager = (LocationManager)getSystemService(Context.LOCATION_SERVICE);
Location location = manager.getLastKnownLocation(LocationManager.GPS_PROVIDER);
//第一次获得设备的位置
updateLocation(location);
//重要函数，监听数据测试
manager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 6000, 10,
locationListener);
}
/*此处更新一下，当activity不处于活动状态时取消GPS的监听*/
public void onPause(){
super.onPause();
locationManager.removeListener(locationListener);
}
//创建一个事件监听器
private final LocationListener locationListener = new LocationListener() {
public void onLocationChanged(Location location) {
updateLocation(location);
}
public void onProviderDisabled(String provider){
updateLocation(null);
Log.i(TAG, "Provider now is disabled..");
}
public void onProviderEnabled(String provider){
Log.i(TAG, "Provider now is enabled..");
}
public void onStatusChanged(String provider, int status,Bundle extras){ }
};
//获取用户位置的函数，利用Log显示
private void updateLocation(Location location) {
String latLng;
if (location != null) {
double lat = location.getLatitude();
double lng = location.getLongitude();
latLng = "Latitude:" + lat + " Longitude:" + lng;
} else {
latLng = "Can't access your location";
}
Log.i(TAG, "The location has changed..");
Log.i(TAG, "Your Location:" +latLng);
}
}
只修改activity文件是不够的，因为android系统的安全性，对服务采用授权的机制，所以需要修改manifest.xml文件
view plain
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="uni.location"
android:versionCode="1"
android:versionName="1.0">
<uses-sdk android:minSdkVersion="8" />
<application android:icon="@drawable/icon" android:label="@string/app_name">
<activity android:name=".LocationActivity"
android:label="@string/app_name">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
补充：移动开发 , Android ,
