import android.content.ContentResolver;

 import android.content.Context;

 import android.location.LocationManager;

 import android.provider.Settings;

 /**

  * GPS类，用来判断GPS是否开启，切换GPS状态

  * 在 AndroidManifest.xml中需要添加权限：

  * <uses-permission android:name="android.permission.WRITE_SETTINGS" />

  * <uses-permission android:name="android.permission.WRITE_SECURE_SETTINGS" />

  * 在 AndroidManifest.xml中添加系统权限： android:sharedUserId="android.uid.system"

  * 例如：

  * <manifest xmlns:android="http://schemas.android.com/apk/res/android"

  *     android:sharedUserId="android.uid.system" >

  * @author ljp 2014-1-11

  *

  */

 public class GPS {

     /**

      * Gets the state of GPS location.

      *

      * @param context

      * @return true if enabled.

      */

     public static boolean getGpsState(Context context) {

         ContentResolver resolver = context.getContentResolver();

         boolean open = Settings.Secure.isLocationProviderEnabled(resolver,

                 LocationManager.GPS_PROVIDER);

         System.out.println("getGpsState:" + open);

         return open;

     }

     /**

      * Toggles the state of GPS.

      *

      * @param context

      */

     public static void toggleGps(Context context) {

         ContentResolver resolver = context.getContentResolver();

         boolean enabled = getGpsState(context);

         Settings.Secure.setLocationProviderEnabled(resolver,

                 LocationManager.GPS_PROVIDER, !enabled);

     }

 }