我想每15分钟在后台获取当前位置。我已经使用Timer创建了一个后台服务。但是它在某个时间点停止。
请纠正我，如何一直在后台不停地运行它？
public class BackgroundService extends Service implements LocationListener {
public static String str_receiver = "app.BackgroundService.Locationreceiver";
boolean isGPSEnable = false;
boolean isNetworkEnable = false;
double latitude, longitude;
LocationManager locationManager;
Location location;
long notify_interval = 600000;
Intent intent;
private Handler mHandler = new Handler();
private Timer mTimer = null;
public BackgroundService() {
}
@Nullable
@Override
public IBinder onBind(Intent intent) {
return null;
}
@Override
public void onCreate() {
super.onCreate();
Toast.makeText(BackgroundService.this, "Getting Location", Toast.LENGTH_SHORT).show();
mTimer = new Timer();
mTimer.schedule(new TimerTaskToGetLocation(), 60000, notify_interval);
intent = new Intent(str_receiver);
}
@Override
public void onLocationChanged(Location location) {
}
@Override
public void onStatusChanged(String provider, int status, Bundle extras) {
}
@Override
public void onProviderEnabled(String provider) {
}
@Override
public void onProviderDisabled(String provider) {
}
private void fn_getlocation() {
locationManager = (LocationManager) getApplicationContext().getSystemService(LOCATION_SERVICE);
isGPSEnable = locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER);
isNetworkEnable = locationManager.isProviderEnabled(LocationManager.NETWORK_PROVIDER);
if (!isGPSEnable && !isNetworkEnable) {
Toast.makeText(BackgroundService.this, "GPS disabled", Toast.LENGTH_LONG).show();
} else {
if (isNetworkEnable) {
location = null;
if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
// TODO: Consider calling
// ActivityCompat#requestPermissions
// here to request the missing permissions, and then overriding
// public void onRequestPermissionsResult(int requestCode, String[] permissions,
// int[] grantResults)
// to handle the case where the user grants the permission. See the documentation
// for ActivityCompat#requestPermissions for more details.
return;
}
locationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 1000000, 20, this);
if (locationManager != null) {
location = locationManager.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
if (location != null) {
Log.e("latitude", location.getLatitude() + "");
Log.e("longitude >>", location.getLongitude() + "");
latitude = location.getLatitude();
longitude = location.getLongitude();
fn_update(location);
}
}
}
if (isGPSEnable) {
location = null;
if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
// TODO: Consider calling
// ActivityCompat#requestPermissions
// here to request the missing permissions, and then overriding
// public void onRequestPermissionsResult(int requestCode, String[] permissions,
// int[] grantResults)
// to handle the case where the user grants the permission. See the documentation
// for ActivityCompat#requestPermissions for more details.
return;
}
locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 1000000, 20, this);
if (locationManager != null) {
location = locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);
if (location != null) {
Log.e("latitude>>", location.getLatitude() + "");
Log.e("longitude", location.getLongitude() + "");
latitude = location.getLatitude();
longitude = location.getLongitude();
fn_update(location);
}
}
}
}
}
private void fn_update(Location location) {
intent.putExtra("latutide", location.getLatitude() + "");
intent.putExtra("longitude", location.getLongitude() + "");
sendBroadcast(intent);
}
private class TimerTaskToGetLocation extends TimerTask {
@Override
public void run() {
mHandler.post(new Runnable() {
@Override
public void run() {
fn_getlocation();
}
});
}
}
在清单中
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
答案 0 :(得分：0)
问题是位置服务对于Android而言昂贵。因此，当应用进入后台时，android os会停止大量后台服务。这就是为什么您没有获得该位置的原因，或者在某些情况下，您可能会获得原来的位置。
请查看以下内容， android中的背景执行限制 ，以了解有关问题的信息。
因此，您应该使用 ForegroundService ，该服务在服务运行时会生成 通知 。
它的onCreate（）有点像
Traceback (most recent call last):
File "C:\Users\fatima.arshad\AppData\Local\Continuum\anaconda2\envs\web_scraping\lib\site-packages\twisted\internet\defer.py", line 151, in maybeDeferred
result = f(*args, **kw)
File "C:\Users\fatima.arshad\AppData\Local\Continuum\anaconda2\envs\web_scraping\lib\site-packages\pydispatch\robustapply.py", line 55, in robustApply
return receiver(*arguments, **named)
File "C:\Users\fatima.arshad\AppData\Local\Continuum\anaconda2\envs\web_scraping\lib\site-packages\scrapy\extensions\feedexport.py", line 232, in open_spider
uri = self.urifmt % self._get_uri_params(spider)
File "C:\Users\fatima.arshad\AppData\Local\Continuum\anaconda2\envs\web_scraping\lib\site-packages\scrapy\extensions\feedexport.py", line 313, in _get_uri_params
params[k] = getattr(spider, k)
File "C:\Users\fatima.arshad\AppData\Local\Continuum\anaconda2\envs\web_scraping\lib\site-packages\scrapy\spiders\__init__.py", line 36, in logger
logger = logging.getLogger(self.name)
File "C:\Users\fatima.arshad\AppData\Local\Continuum\anaconda2\envs\web_scraping\lib\logging\__init__.py", line 1845, in getLogger
return Logger.manager.getLogger(name)
File "C:\Users\fatima.arshad\AppData\Local\Continuum\anaconda2\envs\web_scraping\lib\logging\__init__.py", line 1174, in getLogger
raise TypeError('A logger name must be a string')
TypeError: A logger name must be a string
它应该以
开头 override fun onCreate() {
super.onCreate()
log("The service has been created".toUpperCase())
var notification = createNotification()
startForeground(1, notification)
}
此处是有关其详细实现的文章。 我希望这对您有帮助。