位置检测的后台服务会在一段时间后关闭。我在onTaskRemoved中有代码为pendingIntent撤销设置警报。我仍然无法解决问题。以下是我的后台服务类的代码：
public class MyService extends Service {
public static final String BROADCAST_ACTION = "Hello World";
private static final int TWO_MINUTES = 1000 * 60 *5;
public LocationManager locationManager;
public MyLocationListener listener;
public Location previousBestLocation = null;
double latitude; // latitude
double longitude; // longitude
Intent intent;
private static final String POST_URL = "http://api.url.com/oauth/api/v1/location/update";
int counter = 0;
public static boolean isRunning = false;
@Override
public void onCreate() {
super.onCreate();
intent = new Intent(BROADCAST_ACTION);
}
@Override
public void onStart(Intent intent, int startId) {
locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
listener = new MyLocationListener();
if (ActivityCompat.checkSelfPermission(this, android.Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, android.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, 4000, 0, listener);
locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 4000, 0, listener);
}
@Override
public IBinder onBind(Intent intent) {
super.onCreate();
return (IBinder) intent;
}
protected boolean isBetterLocation(Location location, Location currentBestLocation) {
if (currentBestLocation == null) {
return true;
}
long timeDelta = location.getTime() - currentBestLocation.getTime();
boolean isSignificantlyNewer = timeDelta > TWO_MINUTES;
boolean isSignificantlyOlder = timeDelta < -TWO_MINUTES;
boolean isNewer = timeDelta > 0;
if (isSignificantlyNewer) {
return true;
} else if (isSignificantlyOlder) {
return false;
}
// Check whether the new location fix is more or less accurate
int accuracyDelta = (int) (location.getAccuracy() - currentBestLocation.getAccuracy());
boolean isLessAccurate = accuracyDelta > 0;
boolean isMoreAccurate = accuracyDelta < 0;
boolean isSignificantlyLessAccurate = accuracyDelta > 200;
// Check if the old and new location are from the same provider
boolean isFromSameProvider = isSameProvider(location.getProvider(),
currentBestLocation.getProvider());
// Determine location quality using a combination of timeliness and accuracy
if (isMoreAccurate) {
return true;
} else if (isNewer && !isLessAccurate) {
return true;
} else if (isNewer && !isSignificantlyLessAccurate && isFromSameProvider) {
return true;
}
return false;
}
/**
* Checks whether two providers are the same
*/
private boolean isSameProvider(String provider1, String provider2) {
if (provider1 == null) {
return provider2 == null;
}
return provider1.equals(provider2);
}
@Override
public void onDestroy() {
super.onDestroy();
Toast.makeText(getApplicationContext(),"onDestroy",Toast.LENGTH_LONG).show();
Log.d("onDestroy","onDestroy");
Intent myIntent = new Intent(getApplicationContext(), MyService.class);
PendingIntent pendingIntent = PendingIntent.getService(getApplicationContext(), 0, myIntent, 0);
AlarmManager alarmManager1 = (AlarmManager) getSystemService(ALARM_SERVICE);
Calendar calendar = Calendar.getInstance();
calendar.setTimeInMillis(System.currentTimeMillis());
calendar.add(Calendar.SECOND, 1);
alarmManager1.setRepeating(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(), 10, pendingIntent);
}
@Override
public void onTaskRemoved(Intent rootIntent) {
super.onTaskRemoved(rootIntent);
Toast.makeText(getApplicationContext(),"onTaskRemoved",Toast.LENGTH_LONG).show();
Log.d("onTaskRemoved", "onTaskRemoved");
Intent myIntent = new Intent(getApplicationContext(), MyService.class);
PendingIntent pendingIntent = PendingIntent.getService(getApplicationContext(), 0, myIntent, 0);
AlarmManager alarmManager1 = (AlarmManager) getSystemService(ALARM_SERVICE);
Calendar calendar = Calendar.getInstance();
calendar.setTimeInMillis(System.currentTimeMillis());
calendar.add(Calendar.SECOND, 1);
alarmManager1.setRepeating(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(), 10, pendingIntent) ;
}
public class MyLocationListener implements LocationListener {
public void onLocationChanged(final Location loc) {
if (isBetterLocation(loc, previousBestLocation)) {
latitude = loc.getLatitude();
longitude = loc.getLongitude();
intent.putExtra("Latitude", loc.getLatitude());
intent.putExtra("Longitude", loc.getLongitude());
intent.putExtra("Provider", loc.getProvider());
sendBroadcast(intent);
SharedPreferences check = getApplicationContext().getSharedPreferences("Access_token", Context.MODE_PRIVATE);
final String access_token = check.getString("access_token", "N/A");
StringRequest stringRequest = new StringRequest(Request.Method.POST, POST_URL,
new Response.Listener<String>() {
@Override
public void onResponse(String response) {
Toast.makeText(getApplicationContext(),""+response,Toast.LENGTH_LONG).show();
}
},
new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
Toast.makeText(getApplicationContext(),""+error,Toast.LENGTH_LONG).show();
}
}) {
@Override
protected Map<String, String> getParams() {
Map<String, String> params = new HashMap<String, String>();
params.put("access_token", access_token);
params.put("latitude", String.valueOf(latitude));
params.put("longitude", String.valueOf(longitude));
return params;
}
};
stringRequest.setRetryPolicy(new DefaultRetryPolicy(1 * 500000,
DefaultRetryPolicy.DEFAULT_MAX_RETRIES,
DefaultRetryPolicy.DEFAULT_BACKOFF_MULT));
RequestQueue requestQueue = Volley.newRequestQueue(getApplicationContext());
requestQueue.add(stringRequest);
}
}
@Override
public void onStatusChanged(String provider, int status, Bundle extras) {
}
@Override
public void onProviderEnabled(String provider) {
}
@Override
public void onProviderDisabled(String provider) {
}
}
}
答案 0 :(得分：0)
在onbind方法中返回null，因为返回某些东西意味着你想将它绑定到一个组件，这可能导致在该组件关闭时停止服务。也可以使用onStartCommand而不是onStart。如果你需要OnStartCommand方法中的意图，则返回START_REDELIVER_INTENT标志，否则使用START_STICKY重新启动服务。
public class MyService extends Service {
public static final String BROADCAST_ACTION = "Hello World";
private static final int TWO_MINUTES = 1000 * 60 *5;
public LocationManager locationManager;
public MyLocationListener listener;
public Location previousBestLocation = null;
double latitude; // latitude
double longitude; // longitude
Intent intent;
private static final String POST_URL = "http://api.url.com/oauth/api/v1/location/update";
int counter = 0;
public static boolean isRunning = false;
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
this.intent = new Intent(BROADCAST_ACTION);
locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
listener = new MyLocationListener();
if (ActivityCompat.checkSelfPermission(this, android.Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, android.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.
}
locationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 4000, 0, listener);
locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 4000, 0, listener);
return START_STICKY;
}
protected boolean isBetterLocation(Location location, Location currentBestLocation) {
if (currentBestLocation == null) {
return true;
}
long timeDelta = location.getTime() - currentBestLocation.getTime();
boolean isSignificantlyNewer = timeDelta > TWO_MINUTES;
boolean isSignificantlyOlder = timeDelta < -TWO_MINUTES;
boolean isNewer = timeDelta > 0;
if (isSignificantlyNewer) {
return true;
} else if (isSignificantlyOlder) {
return false;
}
// Check whether the new location fix is more or less accurate
int accuracyDelta = (int) (location.getAccuracy() - currentBestLocation.getAccuracy());
boolean isLessAccurate = accuracyDelta > 0;
boolean isMoreAccurate = accuracyDelta < 0;
boolean isSignificantlyLessAccurate = accuracyDelta > 200;
// Check if the old and new location are from the same provider
boolean isFromSameProvider = isSameProvider(location.getProvider(),
currentBestLocation.getProvider());
// Determine location quality using a combination of timeliness and accuracy
if (isMoreAccurate) {
return true;
} else if (isNewer && !isLessAccurate) {
return true;
} else if (isNewer && !isSignificantlyLessAccurate && isFromSameProvider) {
return true;
}
return false;
}
/**
* Checks whether two providers are the same
*/
private boolean isSameProvider(String provider1, String provider2) {
if (provider1 == null) {
return provider2 == null;
}
return provider1.equals(provider2);
}
@Override
public void onDestroy() {
super.onDestroy();
Toast.makeText(getApplicationContext(),"onDestroy", Toast.LENGTH_LONG).show();
Log.d("onDestroy","onDestroy");
Intent myIntent = new Intent(getApplicationContext(), MyService.class);
PendingIntent pendingIntent = PendingIntent.getService(getApplicationContext(), 0, myIntent, 0);
AlarmManager alarmManager1 = (AlarmManager) getSystemService(ALARM_SERVICE);
Calendar calendar = Calendar.getInstance();
calendar.setTimeInMillis(System.currentTimeMillis());
calendar.add(Calendar.SECOND, 1);
alarmManager1.setRepeating(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(), 10, pendingIntent);
}
@Nullable
@Override
public IBinder onBind(Intent intent) {
return null;
}
@Override
public void onTaskRemoved(Intent rootIntent) {
super.onTaskRemoved(rootIntent);
Toast.makeText(getApplicationContext(),"onTaskRemoved",Toast.LENGTH_LONG).show();
Log.d("onTaskRemoved", "onTaskRemoved");
Intent myIntent = new Intent(getApplicationContext(), MyService.class);
PendingIntent pendingIntent = PendingIntent.getService(getApplicationContext(), 0, myIntent, 0);
AlarmManager alarmManager1 = (AlarmManager) getSystemService(ALARM_SERVICE);
Calendar calendar = Calendar.getInstance();
calendar.setTimeInMillis(System.currentTimeMillis());
calendar.add(Calendar.SECOND, 1);
alarmManager1.setRepeating(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(), 10, pendingIntent) ;
}
public class MyLocationListener implements LocationListener {
public void onLocationChanged(final Location loc) {
if (isBetterLocation(loc, previousBestLocation)) {
latitude = loc.getLatitude();
longitude = loc.getLongitude();
intent.putExtra("Latitude", loc.getLatitude());
intent.putExtra("Longitude", loc.getLongitude());
intent.putExtra("Provider", loc.getProvider());
sendBroadcast(intent);
SharedPreferences check = getApplicationContext().getSharedPreferences("Access_token", Context.MODE_PRIVATE);
final String access_token = check.getString("access_token", "N/A");
StringRequest stringRequest = new StringRequest(Request.Method.POST, POST_URL,
new Response.Listener<String>() {
@Override
public void onResponse(String response) {
Toast.makeText(getApplicationContext(),""+response,Toast.LENGTH_LONG).show();
}
},
new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
Toast.makeText(getApplicationContext(),""+error,Toast.LENGTH_LONG).show();
}
}) {
@Override
protected Map<String, String> getParams() {
Map<String, String> params = new HashMap<String, String>();
params.put("access_token", access_token);
params.put("latitude", String.valueOf(latitude));
params.put("longitude", String.valueOf(longitude));
return params;
}
};
stringRequest.setRetryPolicy(new DefaultRetryPolicy(1 * 500000,
DefaultRetryPolicy.DEFAULT_MAX_RETRIES,
DefaultRetryPolicy.DEFAULT_BACKOFF_MULT));
RequestQueue requestQueue = Volley.newRequestQueue(getApplicationContext());
requestQueue.add(stringRequest);
}
}
@Override
public void onStatusChanged(String provider, int status, Bundle extras) {
}
@Override
public void onProviderEnabled(String provider) {
}
@Override
public void onProviderDisabled(String provider) {
}
}
}