android.location.LocationListener的位置侦听器的onLocationChanged（）函数问题。
在请求requestManager的requestLocationUpdates之后的代码中，onLocationChanged以不均匀的间隔被调用，即我将周期设置为1秒，但我没有在每秒后收到位置更改。
import android.content.Context;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.util.Log;
@SuppressWarnings("MissingPermission")
public class SimplePositionProvider extends PositionProvider implements LocationListener {
public SimplePositionProvider(Context context, PositionListener listener) {
super(context, listener);
Log.i("SimplePositionProvider", "start");
if (!type.equals(LocationManager.NETWORK_PROVIDER)) {
type = LocationManager.GPS_PROVIDER;
}
}
public void startUpdates() {
Log.i("startUpdates", "start");
try {
Log.i("requestLocationUpdates", "start");
Log.i("TYPE", type);
locationManager.requestLocationUpdates(type, period, 0, this);
} catch (Exception e) {
e.printStackTrace();
Log.e(TAG, "error");
}
}
public void stopUpdates() {
Log.i("stopUpdates", "start");
locationManager.removeUpdates(this);
}
@Override
public void onLocationChanged(Location location) {
Log.i("onLocationChanged", "start");
updateLocation(location);
}
@Override
public void onStatusChanged(String provider, int status, Bundle extras) {
Log.i("onStatusChanged", "start");
}
@Override
public void onProviderEnabled(String provider) {
Log.i("onProviderEnabled", "start");
}
@Override
public void onProviderDisabled(String provider) {
Log.i("onProviderDisabled", "start");
}
}
答案 0 :(得分：0)
public class CustomLocationService extends Service implements LocationListener {
private static final Location TODO = null;
boolean isGPSEnabled = false;
boolean isNetworkEnabled = false;
public boolean canGetLocation = false;
Location location;
double latitude;
double longitude;
private static final long MIN_DISTANCE_CHANGE_FOR_UPDATES = 0;
private static final long MIN_TIME_BW_UPDATES = 10000 * 60 * 1;
private CommonSharedPreference commonSharedPreference = new CommonSharedPreference();
protected LocationManager locationManager;
private long time;
Context context;
@Override
public void onCreate() {
super.onCreate();
context = this;
time = MIN_TIME_BW_UPDATES;
getLocation();
}
@Override
public void onStart(Intent intent, int startId) {
getLocation();
}
@Override
public void onDestroy() {
// handler.removeCallbacks(sendUpdatesToUI);
super.onDestroy();
Log.v("STOP_SERVICE", "DONE");
locationManager.removeUpdates(GPSTracker.this);
}
public Location getLocation() {
try {
locationManager = (LocationManager) context.getSystemService(LOCATION_SERVICE);
isGPSEnabled = locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER);
isNetworkEnabled = locationManager.isProviderEnabled(LocationManager.NETWORK_PROVIDER);
if (!isGPSEnabled && !isNetworkEnabled) {
// no network provider is enabled
} else {
this.canGetLocation = true;
// First get location from Network Provider
if (isNetworkEnabled) {
if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
return TODO;
}
locationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, MIN_TIME_BW_UPDATES, MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
if (locationManager != null) {
location = locationManager.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
if (location != null) {
latitude = location.getLatitude();
longitude = location.getLongitude();
}
}
}
// if GPS Enabled get lat/long using GPS Services
if (isGPSEnabled) {
if (location == null) {
locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, MIN_TIME_BW_UPDATES, MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
if (locationManager != null) {
location = locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);
if (location != null) {
latitude = location.getLatitude();
longitude = location.getLongitude();
}
}
}
}
}
} catch (Exception e) {
e.printStackTrace();
}
return location;
}
public void stopUsingGPS() {
if(locationManager != null) {
locationManager.removeUpdates(GPSTracker.this);
}
}
public double getLatitude() {
if(location != null) {
latitude = location.getLatitude();
}
return latitude;
}
public double getLongitude() {
if(location != null) {
longitude = location.getLongitude();
}
return longitude;
}
public boolean canGetLocation() {
return this.canGetLocation;
}
@Override
public void onLocationChanged(Location arg0) {
// TODO Auto-generated method stub
}
@Override
public void onProviderDisabled(String arg0) {
// TODO Auto-generated method stub
}
@Override
public void onProviderEnabled(String arg0) {
// TODO Auto-generated method stub
}
@Override
public void onStatusChanged(String arg0, int arg1, Bundle arg2) {
// TODO Auto-generated method stub
}
@Override
public IBinder onBind(Intent intent) {
// TODO Auto-generated method stub
return null;
}
}
答案 1 :(得分：0)
According to the documentation，您使用的period参数是位置更新之间的最小间隔。如果您希望获得与位置系统更新一样快的位置，请将period设置为零。
答案 2 :(得分：0)
使用此课程..
public class MyLocationService extends Service {
private static final String TAG = "MyLocationService";
private LocationManager mLocationManager = null;
private static final int LOCATION_INTERVAL = 1000 * 30;;
private static final float LOCATION_DISTANCE = 0f;
private final IBinder serviceBinder = new MyLocationService.RunServiceBinder();
public MyLocationService() {
}
LocationListener[] mLocationListeners = new LocationListener[]{
new LocationListener(LocationManager.GPS_PROVIDER),
};
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
Log.e(TAG, "onStartCommand");
super.onStartCommand(intent, flags, startId);
return START_STICKY;
}
@Override
public void onCreate() {
Log.e(TAG, "onCreate");
initializeLocationManager();
/* try {
mLocationManager.requestLocationUpdates(
LocationManager.NETWORK_PROVIDER, LOCATION_INTERVAL, LOCATION_DISTANCE,
mLocationListeners[1]);
} catch (java.lang.SecurityException ex) {
Log.i(TAG, "fail to request location update, ignore", ex);
} catch (IllegalArgumentException ex) {
Log.d(TAG, "network provider does not exist, " + ex.getMessage());
}*/
try {
mLocationManager.requestLocationUpdates(
LocationManager.GPS_PROVIDER, LOCATION_INTERVAL, LOCATION_DISTANCE,
mLocationListeners[0]);
} catch (java.lang.SecurityException ex) {
Log.i(TAG, "fail to request location update, ignore", ex);
} catch (IllegalArgumentException ex) {
Log.d(TAG, "gps provider does not exist " + ex.getMessage());
}
}
@Override
public void onDestroy() {
Log.e(TAG, "onDestroy");
super.onDestroy();
if (mLocationManager != null) {
for (int i = 0; i < mLocationListeners.length; i++) {
try {
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) {
return;
}
mLocationManager.removeUpdates(mLocationListeners[i]);
} catch (Exception ex) {
Log.i(TAG, "fail to remove location listener, ignore", ex);
}
}
}
}
private void removeUpdate(){
if (mLocationManager != null) {
for (int i = 0; i < mLocationListeners.length; i++) {
try {
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) {
return;
}
mLocationManager.removeUpdates(mLocationListeners[i]);
} catch (Exception ex) {
Log.i(TAG, "fail to remove location listener, ignore", ex);
}
}
}
}
private void initializeLocationManager() {
Log.e(TAG, "initializeLocationManager - LOCATION_INTERVAL: " + LOCATION_INTERVAL + " LOCATION_DISTANCE: " + LOCATION_DISTANCE);
if (mLocationManager == null) {
mLocationManager = (LocationManager) getApplicationContext().getSystemService(Context.LOCATION_SERVICE);
}
}
@Override
public IBinder onBind(Intent intent) {
// TODO: Return the communication channel to the service.
// throw new UnsupportedOperationException("Not yet implemented");
return null;
}
public class RunServiceBinder extends Binder {
public MyLocationService getService() {
return MyLocationService.this;
}
}
private class LocationListener implements android.location.LocationListener {
Location mLastLocation;
public LocationListener(String provider) {
Log.e(TAG, "LocationListener " + provider);
// Toast.makeText(MyLocationService.this, ""+provider, Toast.LENGTH_SHORT).show();
mLastLocation = new Location(provider);
}
@Override
public void onLocationChanged(Location location) {
Log.e(TAG, "onLocationChanged: " + location);
// Toast.makeText(MyLocationService.this, ""+"checked", Toast.LENGTH_SHORT).show();
mLastLocation.set(location);
}
@Override
public void onProviderDisabled(String provider) {
Log.e(TAG, "onProviderDisabled: " + provider);
}
@Override
public void onProviderEnabled(String provider) {
Log.e(TAG, "onProviderEnabled: " + provider);
}
@Override
public void onStatusChanged(String provider, int status, Bundle extras) {
Log.e(TAG, "onStatusChanged: " + provider);
}
}
}
答案 3 :(得分：0)
根据tutorial，您应该使用FusedLocationProviderClient来请求位置更新。如果内存服务，该解决方案将以指定的时间间隔发送更新。您可以致电FusedLocationProviderClient获取LocationServices.getFusedLocationProviderClient(Context context)。
您可以使用setExpirationDuration在LocationRequest中设置请求到期时间，然后在每次到期后启动更新重新启动时使用类似代码的内容：
Handler handler = new Handler(Looper.myLooper());
handler.postDelayed(new Runnable() {
@Override
public void run() {
if (expectingLocationUpdates) {
restartLocationUpdates();
}
}
}, EXPIRATION_DURATION);