我正在使用平板电脑,开发html应用程序,希望在不使用任何网络连接的情况下获取gps位置信息。请为我提供简单的建议。
我正在使用平板电脑,开发html应用程序,希望在不使用任何网络连接的情况下获取gps位置信息。请为我提供简单的建议。
<script>
var x = document.getElementById("demo");
function getLocation() {
if (navigator.geolocation) {
navigator.geolocation.getCurrentPosition(showPosition);
} else {
x.innerHTML = "Geolocation is not supported by this browser.";
}
}
function showPosition(position) {
x.innerHTML = "Latitude: " + position.coords.latitude + "<br>Longitude: " + position.coords.longitude;
}
</script>
LocationManager locationManager = (LocationManager)context.getSystemService(Context.LOCATION_SERVICE);
Location userLocation = locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);
Log.d("Latitude", userLocation.getLatitude());
Log.d("Longitude", userLocation.getLongitude());
给予权限:
<uses-permission android:name="android.permission.INTERNET"></uses-permission>
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
获取经纬度:
LocationManager lm = (LocationManager)getSystemService(Context.LOCATION_SERVICE);
Location location = lm.getLastKnownLocation(LocationManager.GPS_PROVIDER);
double longitude = location.getLongitude();
double latitude = location.getLatitude();
保存为txt文件:
public void generateLatLongOnSDCard(String sFileName, String sBody){
try
{
File rootDirFile = new File(Environment.getExternalStorageDirectory(), "LatLong");
if (!rootDirFile.exists()) {
rootDirFile.mkdirs();
}
File gpxfile = new File(rootDirFile, sFileName);
FileWriter writer = new FileWriter(gpxfile);
writer.append(sBody);
writer.flush();
writer.close();
Toast.makeText(this, "Saved", Toast.LENGTH_SHORT).show();
}
catch(IOException e)
{
e.printStackTrace();
}
}
最后你可以读取文本文件。
如果您想获得更准确的位置信息,应该请求更新,仅使用上次已知位置是不够的。GPS_PROVIDER 只会提供来自 GPS 的位置更新,而不是网络提供商。然而,如果您使用 NETWORK_PROVIDER,则可以在室内获取更准确的位置值。
public class MainActivity extends Activity implements LocationListener{
protected LocationManager locationManager;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, this);
}
@Override
public void onLocationChanged(Location location) {
txtLat.setText("Latitude:" + location.getLatitude() + ", Longitude:" + location.getLongitude());
}
@Override
public void onProviderDisabled(String provider) {
Log.d("Latitude","disable");
}
@Override
public void onProviderEnabled(String provider) {
Log.d("Latitude","enable");
}
@Override
public void onStatusChanged(String provider, int status, Bundle extras) {
Log.d("Latitude","status");
}
}