我遇到了Android 10中的问题，即当后台应用或应用被杀死时，每10分钟要获取一次位置。直到android 9 pie一切都工作正常，但是在android 10中，当应用在几秒钟内进入后台时，在服务中调用了onDestory（）方法，并且服务正在销毁。我该如何解决这个问题并在后台启动服务。这是我的服务班级：
public class LocaionTrackingService extends Service {
private static final String TAG = "LocaionTrackingService";
private LocationManager mLocationManager = null;
private static final int LOCATION_INTERVAL = Common.LOCATION_TIME_INTERVAL;
private static final float LOCATION_DISTANCE = 0;
private Context mContext;
boolean checkGPS = false;
boolean checkNetwork = false;
Location loc;
public static final int notify = Common.LOCATION_TIME_INTERVAL; //interval between two services(Here Service run every 5 Minute)
private Handler mHandler = new Handler(); //run on another Thread to avoid crash
private Timer mTimer = null;
private class LocationListener implements android.location.LocationListener {
Location mLastLocation;
public LocationListener(String provider) {
Common.printLog(TAG, "LocationListener " + provider);
mLastLocation = new Location(provider);
}
@Override
public void onLocationChanged(Location location) {
if (location != null) {
Common.printLog(TAG, "onLocationChanged: " + location + "\n" + "Lat:" + location.getLatitude() + "\nLang:" + location.getLongitude());
mLastLocation.set(location);
try {
Geocoder geocoder = new Geocoder(getApplicationContext(), Locale.getDefault());
List<Address> addresses = geocoder.getFromLocation(location.getLatitude(), location.getLongitude(), 1);
if (addresses.size() > 0) {
String address = Common.getFullAddressFromGeoCoder(addresses.get(0));
PreferenceData.setLocationData(String.valueOf(location.getLatitude()), String.valueOf(location.getLongitude()), address);
Common.printLog(TAG, "->address" + address);
}
sendLatLong(location.getLatitude() + "", location.getLongitude() + "", PreferenceData.getAddress(), Common.isGPSON(getApplicationContext()) ? "1" : "0");
} catch (Exception e) {
e.printStackTrace();
}
}
}
@Override
public void onProviderDisabled(String provider) {
Common.printLog(TAG, "onProviderDisabled: " + provider);
}
@Override
public void onProviderEnabled(String provider) {
Common.printLog(TAG, "onProviderEnabled: " + provider);
}
@Override
public void onStatusChanged(String provider, int status, Bundle extras) {
Common.printLog(TAG, "onStatusChanged: " + provider);
}
}
LocationListener[] mLocationListeners = new LocationListener[]{
new LocationListener(LocationManager.GPS_PROVIDER),
new LocationListener(LocationManager.NETWORK_PROVIDER)
};
@Override
public IBinder onBind(Intent arg0) {
throw new UnsupportedOperationException("Not yet implemented");
}
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
Common.printLog(TAG, "onStartCommand");
super.onStartCommand(intent, flags, startId);
return START_STICKY;
}
@Override
public void onCreate() {
Common.printLog(TAG, "onCreate");
initializeLocationManager();
setLastLocation();
if (mTimer != null) // Cancel if already existed
mTimer.cancel();
else
mTimer = new Timer(); //recreate new
mTimer.scheduleAtFixedRate(new TimeDisplay(), 0, notify); //Schedule task
}
void getAddressfromGeocoder(double Latitude, double Longitude) {
try {
Geocoder geocoder = new Geocoder(getApplicationContext(), Locale.getDefault());
List<Address> addresses = null;
addresses = geocoder.getFromLocation(Latitude, Longitude, 1);
if (addresses.size() > 0) {
String address = Common.getFullAddressFromGeoCoder(addresses.get(0));
PreferenceData.setLocationData(String.valueOf(Latitude), String.valueOf(Longitude), address);
Common.printLog(TAG, "tag->getAddressfromGeocoder :" + address + "\nLatitude" + Latitude + "\nLongitude" + Longitude);
}
} catch (IOException e) {
e.printStackTrace();
}
}
void setLastLocation() {
try {
if (!checkGPS && !checkNetwork) {
//Toast.makeText(mContext, "No Service Provider is available", Toast.LENGTH_SHORT).show();
} else {
if (checkGPS && !PreferenceData.getLastLAN().equals("") && !PreferenceData.getLastLAT().equals("")) {
Common.printLog(TAG, "check For GPS");
mLocationManager.requestLocationUpdates(
LocationManager.GPS_PROVIDER, LOCATION_INTERVAL, LOCATION_DISTANCE,
mLocationListeners[0]);
if (mLocationListeners != null) {
loc = mLocationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);
if (loc != null) {
getAddressfromGeocoder(loc.getLatitude(), loc.getLongitude());
}
}
} else if (checkNetwork) {
Common.printLog(TAG, "check For Network");
mLocationManager.requestLocationUpdates(
LocationManager.NETWORK_PROVIDER, LOCATION_INTERVAL, LOCATION_DISTANCE,
mLocationListeners[1]);
if (mLocationListeners != null) {
loc = mLocationManager.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
if (loc != null) {
getAddressfromGeocoder(loc.getLatitude(), loc.getLongitude());
}
}
}
}
} catch (java.lang.SecurityException ex) {
Common.printLog(TAG, "fail to request location update, ignore" + ex);
} catch (IllegalArgumentException ex) {
Common.printLog(TAG, "gps provider does not exist " + ex.getMessage());
}
}
@Override
public void onDestroy() {
Common.printLog(TAG, "onDestroy");
super.onDestroy();
mTimer.cancel();
if (mLocationManager != null) {
for (int i = 0; i < mLocationListeners.length; i++) {
try {
mLocationManager.removeUpdates(mLocationListeners[i]);
} catch (Exception ex) {
Common.printLog(TAG, "fail to remove location listners, ignore" + ex);
}
}
}
}
private void initializeLocationManager() {
Common.printLog(TAG, "initializeLocationManager");
if (mLocationManager == null) {
mLocationManager = (LocationManager) getApplicationContext().getSystemService(Context.LOCATION_SERVICE);
// get GPS status
checkGPS = mLocationManager.isProviderEnabled(LocationManager.GPS_PROVIDER);
// get network provider status
checkNetwork = mLocationManager.isProviderEnabled(LocationManager.NETWORK_PROVIDER);
}
}
void sendLatLong(final String Lat, final String Long, final String address, final String isLocationOn) {
if (NetworkUtil.getConnectivityStatus(getApplicationContext()) != 0) {
String url = Common.LIVE_EMP_TRACK;
Common.printLog(TAG, "url->" + url);
StringRequest strReq = new StringRequest(Request.Method.POST,
url, new Response.Listener<String>() {
@Override
public void onResponse(String response) {
Common.printLog(TAG + "->response", response);
PreferenceData.setLocationData(Lat, Long, address);
PreferenceData.setLastUpdateLocation(System.currentTimeMillis());
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
//Common.printLog(TAG, String.valueOf(Common.getErrorMsg(mContext, error, null)));
PreferenceData.setLastUpdateLocation(System.currentTimeMillis());
}
}) {
@Override
protected Map<String, String> getParams() {
Map<String, String> params = new HashMap<String, String>();
params.put("Latitude", Lat);
params.put("Longitude", Long);
params.put("Location", address);
params.put("isLocationOn", isLocationOn);
params.put("EmpId", PreferenceData.getUserBy());
return params;
}
@Override
public Map<String, String> getHeaders() throws AuthFailureError {
Map<String, String> params = new HashMap<String, String>();
params.put("API-Key", BuildConfig.KEY);
params.put("Clientip", PreferenceData.getIpAddress());
params.put("Userid", PreferenceData.getUserId());
return params;
}
};
VolleySingleton.getInstance(getApplicationContext()).addToRequestQueue(strReq);
} else {
Common.printLog("Service", "No network");
}
}
//class TimeDisplay for handling task
class TimeDisplay extends TimerTask {
@Override
public void run() {
// run on another thread
mHandler.post(new Runnable() {
@Override
public void run() {
setLastLocation();
Common.printLog(TAG, "Location Service running-" + Calendar.getInstance().getTimeInMillis());
//Toast.makeText(LocaionTrackingService.this, "Service is running", Toast.LENGTH_SHORT).show();
sendLatLong(PreferenceData.getLastLAT(), PreferenceData.getLastLAN(), PreferenceData.getAddress(), Common.isGPSON(getApplicationContext()) ? "1" : "0");
}
});
}
}
}
答案 0 :(得分：1)
由于android在post-O设备中执行后台任务的局限性，如果应用在后台运行一段时间，则android系统会破坏后台服务。
您应在{中使用startForeground() {1}}将该服务作为前台服务启动，并显示有关该服务的通知。