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> </activity>
</application> <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" /> </manifest>
很多朋友可能会有疑问,那就是GPS定位在android虚拟机上的调试问题,其实是可以模拟的,大家启动虚拟机,然后打开DDMS的界面,左侧device栏目会动态显示虚拟机上各项服务启动的情况,待出虚拟机现解锁界面后,单机device栏目下面的emulator行,这时会发现下面的emulator control下面会有location control ,打开里面的manual标签,哈哈相信你已经看到了经纬度,你可以更改。运行你的程序,然后单击刚才经纬度设置的send按钮就可以模拟接受到新的地理位置了。
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