我正在尝试创建一个服务，该服务将每隔x秒和y个距离后接收位置更新。我在x秒后收到更新，但从未收到y距离。我已经用不同的值对它进行了多次测试，似乎setSmallestDisplacement根本无法工作。关于此事有很多帖子，但没有任何解决方案。如果有人可以帮助我，甚至为我指明另一个方向，我将不胜感激。
我的服务
public class GPS_Service extends Service implements GoogleApiClient.ConnectionCallbacks,
GoogleApiClient.OnConnectionFailedListener, LocationListener {
private GoogleApiClient mGoogleApiClient;
private LocationRequest mLocationRequest;
private int timethresh;
private int distancethresh;
protected Location mCurrentLocation;
@Override
public IBinder onBind(Intent intent) {
return null;
}
@Override
public void onCreate() {
super.onCreate();
mGoogleApiClient = new GoogleApiClient.Builder(this)
.addApi(LocationServices.API)
.addConnectionCallbacks(this)
.addOnConnectionFailedListener(this)
.build();
mGoogleApiClient.connect();
}
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
mLocationRequest = new LocationRequest();
mLocationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
//Set the desired interval for active location updates, in milliseconds.
mLocationRequest.setInterval(60* 1000);
//Explicitly set the fastest interval for location updates, in milliseconds.
mLocationRequest.setFastestInterval(30* 1000);
//Set the minimum displacement between location updates in meters
mLocationRequest.setSmallestDisplacement(1); // float
return super.onStartCommand(intent, flags, startId);
}
@Override
public void onConnected(Bundle bundle) {
if (mCurrentLocation == null) {
mCurrentLocation = LocationServices.FusedLocationApi.getLastLocation(mGoogleApiClient);
}
//Requests location updates from the FusedLocationApi.
startLocationUpdates();
}
@Override
public void onLocationChanged(Location location) {
mCurrentLocation = location;
//Toast.makeText(this, ""+mCurrentLocation.getLatitude()+","+mCurrentLocation.getLongitude(), Toast.LENGTH_SHORT).show();
System.out.println(""+mCurrentLocation.getLatitude()+","+mCurrentLocation.getLongitude());
}
@Override
public void onConnectionSuspended(int i) {
// The connection to Google Play services was lost for some reason. We call connect() to
// attempt to re-establish the connection.
mGoogleApiClient.connect();
}
@Override
public void onConnectionFailed(ConnectionResult connectionResult) {
Toast.makeText(getApplicationContext(),"Location services connection failed with code " + connectionResult.getErrorCode(), Toast.LENGTH_LONG).show();
}
protected void startLocationUpdates() {
LocationServices.FusedLocationApi.requestLocationUpdates(
mGoogleApiClient, mLocationRequest, this);
}
}
根据这个SO问题，特别是CGR的答案。
如果Device仍处于静止状态，则为LocationRequest设置的Displacement没有机会获取位置，因为Displacement优先于Inteval（interval和fasterInterval）。我猜到了-也许您已将其他LocationRequest对象（未设置位移）传递给LocationServices.FusedLocationApi.requestLocationUpdates（）。
LocationRequest setSmallestDisplacement（浮动最小DisplacementMeters）
设置位置更新之间的最小位移（以米为单位）。默认情况下，此值是0。它返回相同的对象，以便可以将设置器链接起来。
注意：来自具有ACCESS_COARSE_LOCATION而不是ACCESS_FINE_LOCATION的应用程序的位置请求将自动调节到较慢的时间间隔，并且位置对象将被混淆以仅显示粗略的准确性。
检查此页面以获取更多信息。
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