我需要找到距离最远的药房并将其ID添加到数据库中的表中。
public class gpslocation implements LocationListener {
private final Context mContext;
protected LocationManager locationManager;
boolean checkGPS = false;
boolean checkNetwork = false;
boolean canGetLocation = false;
Location loc;
double latitude;
double longitude;
String city;
private static final long MIN_DISTANCE_CHANGE_FOR_UPDATES = 10;
private static final long MIN_TIME_BW_UPDATES = 1000 * 60 * 1;
public gpslocation(Context mContext) {
this.mContext = mContext;
getLocation();
}
public Location getLocation() {
try {
locationManager = (LocationManager) mContext.getSystemService(LOCATION_SERVICE);
// getting GPS status
checkGPS = locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER);
// getting network status
checkNetwork = locationManager.isProviderEnabled(LocationManager.NETWORK_PROVIDER);
if (!checkGPS && !checkNetwork) {
Toast.makeText(mContext, "No Service Provider Available", Toast.LENGTH_SHORT).show();
} else {
this.canGetLocation = true;
// First get location from Network Provider
if (checkNetwork) {
Toast.makeText(mContext, "Network", Toast.LENGTH_SHORT).show();
try {
locationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, MIN_TIME_BW_UPDATES, MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
Log.d("Network", "Network");
if (locationManager != null) {
loc = locationManager.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
}
if (loc != null) {
latitude = loc.getLatitude();
longitude = loc.getLongitude();
}
} catch (SecurityException e) {
}
}
}
// if GPS Enabled get lat/long using GPS Services
if (checkGPS) {
Toast.makeText(mContext, "GPS", Toast.LENGTH_SHORT).show();
if (loc == null) {
try {
locationManager.requestLocationUpdates(
LocationManager.GPS_PROVIDER,
MIN_TIME_BW_UPDATES,
MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
Log.d("GPS Enabled", "GPS Enabled");
if (locationManager != null) {
loc = locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);
if (loc != null) {
latitude = loc.getLatitude();
longitude = loc.getLongitude();
}
}
} catch (SecurityException e) {
Log.d("Exce", e + "");
}
}
}
} catch (Exception e) {
e.printStackTrace();
}
return loc;
}
public double getLongitude() {
if (loc != null) {
longitude = loc.getLongitude();
}
return longitude;
}
public double getLatitude() {
if (loc != null) {
latitude = loc.getLatitude();
// loc.
}
return latitude;
}
public boolean canGetLocation() {
return this.canGetLocation;
}
public void showSettingsAlert() {
AlertDialog.Builder alertDialog = new AlertDialog.Builder(mContext);
alertDialog.setTitle("GPS Not Enabled");
alertDialog.setMessage("Do you wants to turn On GPS");
alertDialog.setPositiveButton("Yes", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
Intent intent = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
mContext.startActivity(intent);
}
});
alertDialog.setNegativeButton("No", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
dialog.cancel();
}
});
alertDialog.show();
}
public void stopUsingGPS() {
if (locationManager != null) {
// locationManager.removeUpdates(this);
}
}
@Override
public void onLocationChanged(Location location) {
Geocoder geocoder;
List<Address> addresses;
geocoder = new Geocoder(mContext, Locale.getDefault());
try {
addresses = geocoder.getFromLocation(latitude, longitude, 1); // Here 1 represent max location result to returned, by documents it recommended 1 to 5
String address = addresses.get(0).getAddressLine(0); // If any additional address line present than only, check with max available address lines by getMaxAddressLineIndex()
city = addresses.get(0).getLocality();
String state = addresses.get(0).getAdminArea();
String country = addresses.get(0).getCountryName();
String postalCode = addresses.get(0).getPostalCode();
String knownName = addresses.get(0).getFeatureName();
// Only if available else return NULL
Toast.makeText(mContext, "Longitude:" + Double.toString(longitude) + "\nLatitude:" + Double.toString(latitude), Toast.LENGTH_SHORT).show();
} catch (IOException e) {
e.printStackTrace();
}
}
@Override
public void onStatusChanged(String provider, int status, Bundle extras) {
}
@Override
public void onProviderEnabled(String provider) {
}
@Override
public void onProviderDisabled(String provider) {
}
// Boolean checkgps = true;
// String gps = String.valueOf(checkgps);
}
这是我在Android Studio中查找纬度和经度的代码。
package DatabasePackage;
import java.sql.ResultSet;
import org.json.JSONArray;
import org.json.JSONObject;
public class locationcalculation {
double distance;
boolean b;
int i;
ConnectionClass con=new ConnectionClass();
public String getlocation(String lat1,String lon1){
String a="";
String se="Select * from tbl_pharmacy ";
ResultSet rs=con.selectCommand(se);
JSONArray ja = new JSONArray();
JSONObject job;
try{
while(rs.next()){
String lattitude=rs.getString("lattitude");
String longitude=rs.getString("longitude");
double dis=Calculation(lat1, lattitude, lon1, longitude);
distance=dis;
if(dis<=10){
job=new JSONObject();
job.put("distance", distance);
job.put("id", rs.getString("phar_id"));
ja.put(job);
break;
}
else if(dis<5){
break;
}
}
}catch(Exception ex){
}
return ja.toString();
}
public double Calculation(String latt1,String latt2,String longg1,String longg2){
String j="";
final int R = 6371; // Radius of the earth
double lat1=Integer.parseInt(latt1);
double lat2=Integer.parseInt(latt2);
double lon1=Integer.parseInt(longg1);
double lon2=Integer.parseInt(longg2);
double theta = lon1 - lon2;
double dist = Math.sin(deg2rad(lat1))
* Math.sin(deg2rad(lat2))
+ Math.cos(deg2rad(lat1))
* Math.cos(deg2rad(lat2))
* Math.cos(deg2rad(theta));
dist = Math.acos(dist);
dist = rad2deg(dist);
dist = dist * 60 * 1.1515;
return (dist);
}
private double deg2rad(double deg) {
return (deg * Math.PI / 180.0);
}
private double rad2deg(double rad) {
return (rad * 180.0 / Math.PI);
}
}
这是我的Java类（用NetBeans编写），用于查找两对纬度和经度之间的距离。一对将从Android设备获取，另一对将从heidisql数据库获取。
String Dis=distance.getlocation(latt, lon);
String str1="insert into
tbl_prescription(prescription,user_id)values('"+value[0]+"','1')";
// String str1="insert into
tbl_prescription(prescription)values('"+value[0]+"')";
// System.out.println(str1
//out.println(str1);
boolean status=con.executeCommand(str1);
这是我必须调用java类中定义的函数getLocation（）（也用NetBeans编写，但在其他jsp页面中）的地方。但是我不知道如何从android设备获取值到此函数调用。有人可以为我解决吗？