我的问题是我的代码没有从GPS获取位置，但始终来自网络提供商
我添加了这两行
Log.i("GPSTracker GPS","lat : " + latitude + ", long : " + longitude);
在我的以下代码中检查我的应用用于获取位置的内容
，而
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) {
this.canGetLocation = true;
if (isGPSEnabled) {
if (location == null) {
if (ActivityCompat.checkSelfPermission(context, Manifest.permission.ACCESS_FINE_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_tab grants the permission. See the documentation
// for ActivityCompat#requestPermissions for more details.
if (!ActivityCompat.shouldShowRequestPermissionRationale((Activity) context,
Manifest.permission.ACCESS_FINE_LOCATION)) {
ActivityCompat.requestPermissions((Activity) context,
new String[]{Manifest.permission.ACCESS_FINE_LOCATION},
PackageManager.PERMISSION_GRANTED);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR2) {
ActivityCompat.requestPermissions((Activity) context,
new String[]{Manifest.permission.LOCATION_HARDWARE},
PackageManager.PERMISSION_GRANTED);
}
}
}
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();
Log.i("GPSTracker GPS","lat : " + latitude + ", long : " + longitude);
}
}
}
}
if (isNetworkEnabled) {
if (ActivityCompat.checkSelfPermission(context, Manifest.permission.INTERNET)
!= 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_tab grants the permission. See the documentation
// for ActivityCompat#requestPermissions for more details.
if (!ActivityCompat.shouldShowRequestPermissionRationale((Activity) context,
Manifest.permission.INTERNET)) {
ActivityCompat.requestPermissions((Activity) context,
new String[]{Manifest.permission.INTERNET},
PackageManager.PERMISSION_GRANTED);
}
if (!ActivityCompat.shouldShowRequestPermissionRationale((Activity) context,
Manifest.permission.ACCESS_COARSE_LOCATION)) {
ActivityCompat.requestPermissions((Activity) context,
new String[]{Manifest.permission.ACCESS_COARSE_LOCATION},
PackageManager.PERMISSION_GRANTED);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR2) {
ActivityCompat.requestPermissions((Activity) context,
new String[]{Manifest.permission.LOCATION_HARDWARE},
PackageManager.PERMISSION_GRANTED);
}
}
}
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();
Log.i("GPSTracker Net","lat : " + latitude + ", long : " + longitude);
}
}
}
}
} catch (Exception e) {
e.printStackTrace();
}
locationManager.removeUpdates(this);
return location;
}
我的整个代码都在关注
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
我的清单文件是
std::vector<unsigned char> v {1, 2, 3};
std::string s; // result
auto sep = ""; // continuation separator
for(auto n: v)
{
s += sep + std::to_string(n);
sep = "-"; // change the continuation separator after first element
}
std::cout << s << '\n';
我希望我的应用在位置开启时从GPS获取位置 如果设置中的位置已关闭 - 如果有方法
，则从网络提供商处获取经度和纬度答案 0 :(得分：1)
有两个原因。
1）你的代码以错误的顺序执行。它检查gps，然后检查网络。因此，如果两者都被启用（99％的时间），gps将被覆盖。
2）GPS需要时间。你试图调用getLastKnownLocation，这几乎不会起作用。如果您想要GPS位置，请等待回叫。
旁注：这段代码在多种方式上存在严重缺陷。 GPSTracker严重受损。不要使用它。在http://gabesechansoftware.com/location-tracking/
了解原因答案 1 :(得分：0)
是，您可以检查设备是否启用了A-GPS。如果启用了A-GPS，则可以 通过A-GPS（辅助GPS）网络进行拉特龙。
您可以使用适合我的以下代码示例：
public Location getLocation(Context context) {
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;
}
TrackLogin trackLogin = new DatabaseManager(context).GetTrackLogout();
// if GPS Enabled get lat/long using GPS Services
// if (isGPSEnabled) {
if (trackLogin.LocationProvider.equals("G")) {
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("G");
// SyncWithDB(latitude, longitude, "G");
}
}
}
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("A");
//SyncWithDB(latitude,longitude,"A");
}
}
}
}
if (trackLogin.LocationProvider.equals("A")) {
if (isNetworkEnabled) {
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("A");
//SyncWithDB(latitude,longitude,"A");
}
}
}
if(isGPSEnabled && location==null) {
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("G");
}
}
}
}
}
} catch (Exception e) {
e.printStackTrace();
new DatabaseManager(context).save_ErrorLog("LocationCls","getLocation()->catch",e.getMessage());
}
return location;
}
注意： 我将GPS网络放在首位。如果无法使用，那我就从A-GPS网络上拉了很久。 希望对您有帮助。