我現在有與緯度,經度相關信息接收GCM消息的IntentService,我想註冊在後臺地理圍欄沒有前景的應用程序。我已經嘗試將工作(在一個活動中)代碼放入IntentService中,但是我得到了一個nullpointerexception,我不知道爲什麼。在後臺創建的Android地理圍欄沒有崩潰
@Override
protected void onHandleIntent(Intent intent) {
Bundle extras = intent.getExtras();
GoogleCloudMessaging gcm = GoogleCloudMessaging.getInstance(this);
String messageType = gcm.getMessageType(intent);
if (!extras.isEmpty()) {
Double lat = Double.parseDouble(extras.getString("lat"));
Double lng = Double.parseDouble(extras.getString("lng"));
Float radius = Float.parseFloat("600");
createGeofences(lat,lng,radius);
}
}
GcmBroadcastReceiver.completeWakefulIntent(intent);
}
public void createGeofences(Double lat, Double lng, Float radius) {
mRequestType = GeofenceUtils.REQUEST_TYPE.ADD;
SimpleGeofence mGeofence = new SimpleGeofence(
"1",
lat,
lng,
radius,
GEOFENCE_EXPIRATION_IN_MILLISECONDS,
Geofence.GEOFENCE_TRANSITION_ENTER);
// Store this flat version in SharedPreferences
//mPrefs.setGeofence("1", mGeofence);
/*
* Add Geofence objects to a List. toGeofence()
* creates a Location Services Geofence object from a
* flat object
*/
mCurrentGeofences.add(mGeofence.toGeofence());
try {
mGeofenceRequester.addGeofences(mCurrentGeofences);
} catch (UnsupportedOperationException e) {
Toast.makeText(this, R.string.add_geofences_already_requested_error,
Toast.LENGTH_LONG).show();
}
這是錯誤消息:
java.lang.NullPointerException
at com.app.portalalert.GcmIntentService.createGeofences(GcmIntentService.java:142)
at com.app.portalalert.GcmIntentService.onHandleIntent(GcmIntentService.java:85)
at android.app.IntentService$ServiceHandler.handleMessage(IntentService.java:65)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:136)
at android.os.HandlerThread.run(HandlerThread.java:61)
任何意見或建議,我怎麼能做到這一點?
什麼在行'GcmIntentService.java:142'? – donfuxx
mCurrentGeofences.add(mGeofence.toGeofence()); – Lorof
你在哪裏初始化'mCurrentGeofences'?全球範圍內的 – donfuxx