我必须每5分钟将用户的位置更新到会议室数据库中，并且它也必须在后台运行。我已经使用LocationRequest和locationCallback来更新位置并将地图坐标存储到房间数据库中。我刚刚读了IntentService，但表现不佳。任何人都可以帮忙做后台服务，还可以根据我的代码检查我是否已经正确完成了操作。
MapsActivity.java：
public class MapsActivity extends FragmentActivity implements OnMapReadyCallback, LocationListener {
private GoogleMap mMap;
private FusedLocationProviderClient fusedLocationClient;
private static final int LOCATION_REQUEST_CODE = 101;
private Location currentLocation;
private LocationRequest mLocationRequest;
private Marker mLocationMarker;
private static final int Request_UserLocation = 99;
public LocationDatabase mRoomDatabase;
protected ResultReceiver receiver;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_maps);
fusedLocationClient = LocationServices.getFusedLocationProviderClient(this);
mRoomDatabase = Room.databaseBuilder(getApplicationContext(), LocationDatabase.class, "locationdb").allowMainThreadQueries().build();
fetchLastLocation();
}
private void fetchLastLocation() {
if (ActivityCompat.checkSelfPermission(MapsActivity.this, android.Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(MapsActivity.this, android.Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
ActivityCompat.requestPermissions(this, new String[]{android.Manifest.permission.ACCESS_FINE_LOCATION}, LOCATION_REQUEST_CODE);
return;
}
Task<Location> task = fusedLocationClient.getLastLocation();
task.addOnSuccessListener(new OnSuccessListener<Location>() {
@Override
public void onSuccess(Location location) {
if (location != null) {
currentLocation = location;
SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager()
.findFragmentById(R.id.map);
mapFragment.getMapAsync(MapsActivity.this);
} else {
Toast.makeText(getApplicationContext(), "No Location recorded", Toast.LENGTH_LONG).show();
}
}
});
}
@Override
public void onMapReady(GoogleMap googleMap) {
mMap = googleMap;
mMap.setMapType(GoogleMap.MAP_TYPE_NORMAL);
mMap.getUiSettings().setZoomControlsEnabled(true);
mMap.getUiSettings().setZoomGesturesEnabled(true);
mMap.getUiSettings().setCompassEnabled(true);
mLocationRequest=new LocationRequest();
mLocationRequest.setInterval(10000);
mLocationRequest.setFastestInterval(10000);
mLocationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
if (android.os.Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
if (ContextCompat.checkSelfPermission(this,
Manifest.permission.ACCESS_FINE_LOCATION)
== PackageManager.PERMISSION_GRANTED) {
//Location Permission already granted
fusedLocationClient.requestLocationUpdates(mLocationRequest, mLocationCallback, Looper.myLooper());
mMap.setMyLocationEnabled(true);
} else {
//Request Location Permission
checkLocationPermission();
}
}
else {
fusedLocationClient.requestLocationUpdates(mLocationRequest, mLocationCallback, Looper.myLooper());
mMap.setMyLocationEnabled(true);
}
}
LocationCallback mLocationCallback=new LocationCallback() {
@Override
public void onLocationResult(LocationResult locationResult){
List<Location> locationList=locationResult.getLocations();
if(locationList.size() > 0){
Location location=locationList.get(locationList.size() - 1);
Log.d("MapsActivity","Location:" +location.getLatitude()+","+location.getLongitude());
currentLocation=location;
if(mLocationMarker != null){
mLocationMarker.remove();
}
LatLng latLng=new LatLng(location.getLatitude(),location.getLongitude());
MarkerOptions markerOptions=new MarkerOptions().position(latLng).title("You are here");
mMap.moveCamera(CameraUpdateFactory.newLatLng(latLng));
mMap.animateCamera(CameraUpdateFactory.zoomTo(15f));
mMap.addMarker(markerOptions);
LocationsModel mLocate=new LocationsModel();
mLocate.setLatitude(location.getLatitude());
mLocate.setLongitude(location.getLongitude());
mRoomDatabase.mLocateDao().addLocations(mLocate);
Toast.makeText(getApplicationContext(), "Location added successfully", Toast.LENGTH_LONG).show();
}
}
};
private void checkLocationPermission(){
if (ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION)
!= PackageManager.PERMISSION_GRANTED) {
// Should we show an explanation?
if (ActivityCompat.shouldShowRequestPermissionRationale(this,
Manifest.permission.ACCESS_FINE_LOCATION)) {
// Show an explanation to the user *asynchronously* -- don't block
// this thread waiting for the user's response! After the user
// sees the explanation, try again to request the permission.
new AlertDialog.Builder(this)
.setTitle("Location Permission Needed")
.setMessage("This app needs the Location permission, please accept to use location functionality")
.setPositiveButton("OK", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialogInterface, int i) {
//Prompt the user once explanation has been shown
ActivityCompat.requestPermissions(MapsActivity.this,
new String[]{Manifest.permission.ACCESS_FINE_LOCATION},
Request_UserLocation );
}
})
.create()
.show();
} else {
// No explanation needed, we can request the permission.
ActivityCompat.requestPermissions(this,
new String[]{Manifest.permission.ACCESS_FINE_LOCATION},
Request_UserLocation );
}
}
}
@Override
public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResult) {
switch (requestCode) {
case LOCATION_REQUEST_CODE:
if (grantResult.length > 0 && grantResult[0] == PackageManager.PERMISSION_GRANTED) {
fetchLastLocation();
} else {
Toast.makeText(MapsActivity.this,"Permission Denied",Toast.LENGTH_SHORT).show();
}
break;
}
}
@Override
public void onLocationChanged(Location location) {
if(mLocationMarker != null){
mLocationMarker.remove();
}
}
@Override
public void onDestroy() {
super.onDestroy();
if(fusedLocationClient != null){
fusedLocationClient.removeLocationUpdates(mLocationCallback);
}
}
}