问题
I want to make an android program in that I get latitude and longitude in Toast after each 1 minute interval and populated on toast even after my application closed.
I have tried as below,But I only getting on time latitude and longitude,Please tell me what should i do for it to get continuously lat long in toast.My code is as below: GPStracker.java
package com.epe.trucktrackers;
import java.util.Timer;
import java.util.TimerTask;
import utils.Const;
import android.app.AlertDialog;
import android.app.Service;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.SharedPreferences;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.os.IBinder;
import android.provider.Settings;
import android.util.Log;
import android.widget.Toast;
public class GPSTracker extends Service implements LocationListener {
private final Context mContext;
// flag for GPS status
boolean isGPSEnabled = false;
// flag for network status
boolean isNetworkEnabled = false;
// flag for GPS status
boolean canGetLocation = false;
private Timer timer;
private long UPDATE_INTERVAL;
public static final String Stub = null;
LocationManager mlocmag;
LocationListener mlocList;
private double lat, longn;
Location location; // location
double latitude; // latitude
double longitude; // longitude
// The minimum distance to change Updates in meters
private static final long MIN_DISTANCE_CHANGE_FOR_UPDATES = 5; // 10 meters
// The minimum time between updates in milliseconds
private static final long MIN_TIME_BW_UPDATES = 1000 * 60 * 1; // 1 minute
// Declaring a Location Manager
protected LocationManager locationManager;
public GPSTracker(Context context) {
this.mContext = context;
getLocation();
}
public Location getLocation() {
try {
locationManager = (LocationManager) mContext
.getSystemService(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 (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();
}
}
}
// if GPS Enabled get lat/long using GPS Services
if (isGPSEnabled) {
if (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();
}
}
}
}
}
} catch (Exception e) {
e.printStackTrace();
}
return location;
}
/**
* Stop using GPS listener Calling this function will stop using GPS in your
* app
* */
public void stopUsingGPS() {
if (locationManager != null) {
locationManager.removeUpdates(GPSTracker.this);
}
}
/**
* Function to get latitude
* */
public double getLatitude() {
if (location != null) {
latitude = location.getLatitude();
}
// return latitude
return latitude;
}
/**
* Function to get longitude
* */
public double getLongitude() {
if (location != null) {
longitude = location.getLongitude();
}
// return longitude
return longitude;
}
/**
* Function to check GPS/wifi enabled
*
* @return boolean
* */
public boolean canGetLocation() {
return this.canGetLocation;
}
/**
* Function to show settings alert dialog On pressing Settings button will
* lauch Settings Options
* */
public void showSettingsAlert() {
AlertDialog.Builder alertDialog = new AlertDialog.Builder(mContext);
// Setting Dialog Title
alertDialog.setTitle("GPS is settings");
// Setting Dialog Message
alertDialog
.setMessage("GPS is not enabled. Do you want to go to settings menu?");
// On pressing Settings button
alertDialog.setPositiveButton("Settings",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
Intent intent = new Intent(
Settings.ACTION_LOCATION_SOURCE_SETTINGS);
mContext.startActivity(intent);
}
});
// on pressing cancel button
alertDialog.setNegativeButton("Cancel",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
dialog.cancel();
}
});
// Showing Alert Message
alertDialog.show();
}
@Override
public void onLocationChanged(Location location) {
String message = String.format(
"Location \n Longitude: %1$s \n Latitude: %2$s",
location.getLongitude(), location.getLatitude());
System.out.println(":::::::::::Ne lat longs............!!!" + message);
longitude = location.getLongitude();
latitude = location.getLatitude();
Toast.makeText(mContext, latitude + " " + longitude, Toast.LENGTH_LONG)
.show();
/* UpdateWithNewLocation(location); */
System.out.println(":Location chane");
}
@Override
public void onProviderDisabled(String provider) {
}
@Override
public void onProviderEnabled(String provider) {
}
@Override
public void onStatusChanged(String provider, int status, Bundle extras) {
}
@Override
public IBinder onBind(Intent arg0) {
return null;
}
}
Activity.java
package com.epe.trucktrackers;
import org.json.JSONException;
import org.json.JSONObject;
import utils.Const;
import android.app.Activity;
import android.app.ProgressDialog;
import android.content.Context;
import android.content.Intent;
import android.location.Location;
import android.os.AsyncTask;
import android.os.Bundle;
import android.telephony.TelephonyManager;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
import backend.BackendAPIService;
public class MainActivity extends Activity {
EditText et_registration_no;
Button btn_register;
static GPSTracker gps;;
String lat, lng;
private ProgressDialog pDialog;
String udid;
String status;
String tracking_id;
String UDID;
String lati;
String longi;
String registration_no;
int flag;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
et_registration_no = (EditText) findViewById(R.id.et_truck_no);
btn_register = (Button) findViewById(R.id.btn_reg);
TelephonyManager TelephonyMgr = (TelephonyManager) getSystemService(TELEPHONY_SERVICE);
udid = TelephonyMgr.getDeviceId();
gps = new GPSTracker(MainActivity.this);
btn_register.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
gps = new GPSTracker(MainActivity.this);
if (gps.canGetLocation()) {
double latitude = gps.getLatitude();
double longitude = gps.getLongitude();
// \n is for new line
Toast.makeText(
getApplicationContext(),
"Your Location is - \nLat: " + latitude
+ "\nLong: " + longitude, Toast.LENGTH_LONG)
.show();
lat = latitude + "";
lng = longitude + "";
} else {
// can't get location
// GPS or Network is not enabled
// Ask user to enable GPS/network in settings
gps.showSettingsAlert();
}
new RegistartionApi().execute();
System.out
.println("::::::::::::::service started:::::::::::::");
}
});
// api call for the REGISTARTION ..!!
}
class RegistartionApi extends AsyncTask<Void, Void, Void> {
@Override
protected void onPreExecute() {
super.onPreExecute();
// Showing progress dialog
pDialog = new ProgressDialog(MainActivity.this);
pDialog.setMessage("Please wait...");
pDialog.setCancelable(false);
pDialog.show();
System.out
.println("==========inside preexecute===================");
}
@Override
protected Void doInBackground(Void... arg0) {
String registrationURL = Const.API_REGISTRATION + "?UDID=" + udid
+ "&latitude=" + lat + "&longitude=" + lng
+ "®istration_no="
+ et_registration_no.getText().toString().trim();
registrationURL = registrationURL.replace(" ", "%");
BackendAPIService sh = new BackendAPIService();
System.out.println(":::::::::::::Registration url:::::::::::;"
+ registrationURL);
String jsonStr = sh.makeServiceCall(registrationURL,
BackendAPIService.POST);
Log.d("Response: ", "> " + jsonStr);
System.out.println("=============MY RESPONSE==========" + jsonStr);
if (jsonStr != null) {
try {
JSONObject jsonObj = new JSONObject(jsonStr);
JSONObject c = new JSONObject(jsonStr);
if (jsonObj.has("status")) {
status = jsonObj.getString("status");
{
if (status.equalsIgnoreCase("success")) {
flag = 1;
c = jsonObj.getJSONObject("truck_tracking");
tracking_id = c.getString("tracking_id");
UDID = c.getString("UDID");
lati = c.getString("latitude");
longi = c.getString("longitude");
registration_no = c
.getString("registration_no");
} else {
flag = 2;
Toast.makeText(MainActivity.this, "Failed",
Toast.LENGTH_SHORT).show();
}
}
}
} catch (JSONException e) {
e.printStackTrace();
}
} else {
Log.e("ServiceHandler", "Couldn't get any data from the url");
}
return null;
}
@Override
protected void onPostExecute(Void result) {
super.onPostExecute(result);
// Dismiss the progress dialog
if (pDialog.isShowing())
pDialog.dismiss();
if (flag == 1) {
Toast.makeText(MainActivity.this, "Registration Done",
Toast.LENGTH_SHORT).show();
/*Intent i = new Intent(getApplicationContext(), GPSTracker.class);
startService(i);*/
}
}
}
}
回答1:
Try this one. package com.sample.location;
import java.util.Timer;
import java.util.TimerTask;
import android.content.Context;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
public class MyLocation {
Timer timer1;
LocationManager lm;
LocationResult locationResult;
boolean gps_enabled = false;
boolean network_enabled = false;
public boolean getLocation(Context context, LocationResult result) {
// I use LocationResult callback class to pass location value from
// MyLocation to user code.
locationResult = result;
if (lm == null)
lm = (LocationManager) context
.getSystemService(Context.LOCATION_SERVICE);
// exceptions will be thrown if provider is not permitted.
try {
gps_enabled = lm.isProviderEnabled(LocationManager.GPS_PROVIDER);
} catch (Exception ex) {
}
try {
network_enabled = lm
.isProviderEnabled(LocationManager.NETWORK_PROVIDER);
} catch (Exception ex) {
}
// don't start listeners if no provider is enabled
if (!gps_enabled && !network_enabled)
return false;
if (gps_enabled)
lm.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0,
locationListenerGps);
if (network_enabled)
lm.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 0, 0,
locationListenerNetwork);
timer1 = new Timer();
timer1.schedule(new GetLastLocation(), 60*1000);
return true;
}
LocationListener locationListenerGps = new LocationListener() {
@Override
public void onLocationChanged(Location location) {
timer1.cancel();
locationResult.gotLocation(location);
lm.removeUpdates(this);
lm.removeUpdates(locationListenerNetwork);
}
/**
* Called when the provider is disabled by the user. If requestLocationUpdates is called on an already disabled provider, this method is called immediately.
* @param provider
* the name of the location provider associated with this update.
*/
@Override
public void onProviderDisabled(String provider) {
}
/**
* Called when the provider is enabled by the user.
* @param provider
* the name of the location provider associated with this update.
*/
@Override
public void onProviderEnabled(String provider) {
}
/**
* Called when the provider status changes. This method is called when a provider is unable to fetch a location or if the provider has recently become available after a period of unavailability.
* @param provider
* the name of the location provider associated with this update.
* @param status
* OUT_OF_SERVICE if the provider is out of service, and this is not expected to change in the near future; TEMPORARILY_UNAVAILABLE if the provider is temporarily unavailable but is expected to be available shortly; and AVAILABLE if the provider is currently available.
* @param extras
* an optional Bundle which will contain provider specific status variables.
A number of common key/value pairs for the extras Bundle are listed below. Providers that use any of the keys on this list must provide the corresponding value as described below.
satellites - the number of satellites used to derive the fix
*/
@Override
public void onStatusChanged(String provider, int status, Bundle extras) {
}
};
LocationListener locationListenerNetwork = new LocationListener() {
/**
* Called when the location has changed.
* There are no restrictions on the use of the supplied Location object.
* @param location
* The new location, as a Location object.
*/
@Override
public void onLocationChanged(Location location) {
timer1.cancel();
locationResult.gotLocation(location);
lm.removeUpdates(this);
lm.removeUpdates(locationListenerGps);
}
/**
* Called when the provider is disabled by the user. If requestLocationUpdates is called on an already disabled provider, this method is called immediately.
* @param provider
* the name of the location provider associated with this update.
*/
@Override
public void onProviderDisabled(String provider) {
}
/**
* Called when the provider is enabled by the user.
* @param provider
* the name of the location provider associated with this update.
*/
@Override
public void onProviderEnabled(String provider) {
}
/**
* Called when the provider status changes. This method is called when a provider is unable to fetch a location or if the provider has recently become available after a period of unavailability.
* @param provider
* the name of the location provider associated with this update.
* @param status
* OUT_OF_SERVICE if the provider is out of service, and this is not expected to change in the near future; TEMPORARILY_UNAVAILABLE if the provider is temporarily unavailable but is expected to be available shortly; and AVAILABLE if the provider is currently available.
* @param extras
* an optional Bundle which will contain provider specific status variables.
A number of common key/value pairs for the extras Bundle are listed below. Providers that use any of the keys on this list must provide the corresponding value as described below.
satellites - the number of satellites used to derive the fix
*/
@Override
public void onStatusChanged(String provider, int status, Bundle extras) {
}
};
/**
* The GPS location and Network location to be calculated
* in every 5 seconds with the help of this class
*
*/
class GetLastLocation extends TimerTask {
@Override
public void run() {
lm.removeUpdates(locationListenerGps);
lm.removeUpdates(locationListenerNetwork);
Location net_loc = null, gps_loc = null;
if (gps_enabled)
gps_loc = lm.getLastKnownLocation(LocationManager.GPS_PROVIDER);
if (network_enabled)
net_loc = lm
.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
// if there are both values use the latest one
if (gps_loc != null && net_loc != null) {
if (gps_loc.getTime() > net_loc.getTime())
locationResult.gotLocation(gps_loc);
else
locationResult.gotLocation(net_loc);
return;
}
if (gps_loc != null) {
locationResult.gotLocation(gps_loc);
return;
}
if (net_loc != null) {
locationResult.gotLocation(net_loc);
return;
}
locationResult.gotLocation(null);
}
}
/**
* This abstract class is used to get the location from other class.
*
*/
public static abstract class LocationResult {
public abstract void gotLocation(Location location);
}
}
In your Activity.java
LocationManager myLocationManager = (LocationManager) getApplicationContext().getSystemService(Context.LOCATION_SERVICE);
MyLocation myLocation = new MyLocation();
myLocation.getLocation(getApplicationContext(), locationResult);
LocationResult locationResult = new LocationResult() {
@Override
public void gotLocation(Location location) {
double latitude = location.getLatitude();
double longitude = location.getLongitude();
}
};
来源：https://stackoverflow.com/questions/23926311/not-getting-latitude-and-longitude-after-every-1-minute-in-android