作者:176精品传奇双线 | 来源:互联网 | 2022-12-01 14:18
背景:我正在开发一款Android应用程序,用于跟踪我需要每10秒获取一次设备位置的车辆,以及管理决策.我们已经开发了这个应用程序,它按时提供我们预期的时间间隔.
问题:当车辆在道路上行驶时,应用程序会给我们正确的坐标作为我们预期的时间间隔,但有时5-20分钟它提供相同的坐标,但车辆位于不同的位置.
代码审查: 1)我们在LocationClass中使用名为getLocation()的方法,它为我们提供设备当前位置的纬度经度.
private static final long MIN_DISTANCE_CHANGE_FOR_UPDATES = 5;
private static final long MIN_TIME_BW_UPDATES = 1000*20;
public Location getLocation(Context context) {
Location location=null;
try {
locatiOnManager= (LocationManager) context
.getSystemService(Context.LOCATION_SERVICE);
// getting GPS status
isGPSEnabled = locationManager
.isProviderEnabled(LocationManager.GPS_PROVIDER);
// getting network status
isNetworkEnabled = locationManager
.isProviderEnabled(LocationManager.NETWORK_PROVIDER);
if (!isGPSEnabled && !isNetworkEnabled) {
// no network provider is enabled
} else {
this.canGetLocation = true;
if (ActivityCompat.checkSelfPermission(context, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(context, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
Toast.makeText(context,"Please! Provide Location Access Permission.....", Toast.LENGTH_LONG).show();
return TODO;
}
// if GPS Enabled get lat/long using GPS Services
if(isGPSEnabled) {
locationManager.requestLocationUpdates(
LocationManager.GPS_PROVIDER,
MIN_TIME_BW_UPDATES,
MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
Log.d("GPS Enabled", "GPS Enabled");
if (locationManager != null) {
location = locationManager
.getLastKnownLocation(LocationManager.GPS_PROVIDER);
if (location != null) {
latitude = location.getLatitude();
lOngitude= location.getLongitude();
location.setProvider("GPS");
}
}
}
if (isNetworkEnabled && location==null) {
locationManager.requestLocationUpdates(
LocationManager.NETWORK_PROVIDER,
MIN_TIME_BW_UPDATES,
MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
Log.d("Network", "Network");
if (locationManager != null) {
location = locationManager
.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
if (location != null) {
latitude = location.getLatitude();
lOngitude= location.getLongitude();
location.setProvider("AGPS");
}
}
}
}
} catch (Exception e) {
e.printStackTrace();
}
return location;
}
2)我们以固定的时间间隔使用名为GPSTracker的服务上的计时器重复此方法.
public class GPSTracker extends Service implements LocationListener {
private Timer mTimer = null;
private Handler mHandler = new Handler();
Location location;
@Override
public void onCreate() {
super.onCreate();
if (mTimer != null) {
mTimer.cancel();
} else {
// recreate new
mTimer = new Timer();
}
// schedule task
mTimer.scheduleAtFixedRate(new TimeDisplayTimerTask(), 10 * 1000, 10 * 1000);
}
class TimeDisplayTimerTask extends TimerTask {
@Override
public void run() {
// run on another thread
mHandler.post(new Runnable() {
@Override
public void run() {
location=new Location("");
LocationCls cls = new LocationCls();
location = cls.getLocation(getBaseContext());
}
});
}
}
}
我试图解决这个问题2天,但尚未找到任何编码问题或解决方案.任何解决方案或建议都非常感谢.
提前致谢....
1> 小智..:
根据你的代码,
locationManager.getLastKnownLocation(LocationManager.NETWORK_PROVIDER)
如果在当前请求中找不到坐标,则getLastKnownLocation提供最后一次已知坐标.您应该使用以下方法获取新位置...
@Override
public void onLocationChanged(Location location) {
double lat=location.getLatitude();
double lng=location.getLongitude();
}
它总是为您提供新的位置而不是最后的已知位置.
另一方面,您可以使用LocationServices API为您的问题提供服务.尝试使用以下链接:https://guides.codepath.com/android/Retrieving-Location-with-LocationServices-API