Android--監聽GPS開啓和關閉

關鍵代碼如下

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getContentResolver()             .registerContentObserver(                     Settings.Secure                             .getUriFor(Settings.System.LOCATION_PROVIDERS_ALLOWED),                     false, mGpsMonitor);

完整的代碼如下：

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public class MyActivity extends Activity {       private final ContentObserver mGpsMonitor = new ContentObserver(null) {         @Override         public void onChange(boolean selfChange) {             super.onChange(selfChange);               boolean enabled = mLocationManager                     .isProviderEnabled(LocationManager.GPS_PROVIDER);             Log.i("gps ： " + enabled);         }     };       private LocationManager mLocationManager;       @Override     protected void onCreate(Bundle savedInstanceState) {         super.onCreate(savedInstanceState);         mLocationManager = (LocationManager) getSystemService(LOCATION_SERVICE);     }       protected void onStart() {         getContentResolver()                 .registerContentObserver(                         Settings.Secure                                 .getUriFor(Settings.Secure.LOCATION_PROVIDERS_ALLOWED),                         false, mGpsMonitor);     };       @Override     protected void onStop() {         super.onStop();         getContentResolver().unregisterContentObserver(mGpsMonitor);     } }