Saya sedang mengerjakan proyek Android di mana saya menggunakan data GPS untuk menampilkan Restoran terdekat. Di sisi server, saya telah menerapkan rumus Haversine untuk mendapatkan Restoran terdekat bergantung pada garis bujur dan garis lintang yang diambil. Namun, saya mengalami masalah tentang bagaimana cara memberi tahu kelas ListActivity saya untuk menunggu hingga lokasi GPS yang bukan nol diambil.
Saya memeriksa pertanyaan serupa, tetapi pertanyaan tersebut tidak memberikan bantuan apa pun untuk ListActivity. Bantuan apa pun akan menyenangkan. Terima kasih banyak.
DaftarKode Restoran :
public class RestaurantList extends ListActivity {
private ResponseEntity<RestRestaurant[]> responseEntity;
private OrderAdapter m_adapter;
private ArrayList<RestRestaurant> m_orders = null;
GPSTracker gps;
double longitude, latitude;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.restos);
final RestTemplate restTemplate = StaticRestTemplate.getRest();
final String restaurantList = StaticRestTemplate.baseURL+"getnearbyrestaurants";
gps = new GPSTracker(RestaurantList.this);
long TIMEOUT = 5000l; // 5 seconds
long startTime = new Date().getTime();
while (!gps.canGetLocation()) {
gps.showSettingsAlert();
long difference = new Date().getTime() - startTime;
if (TIMEOUT > difference) break;
}
latitude = gps.getLatitude();
longitude = gps.getLongitude();
Toast.makeText(getApplicationContext(), "Your Location is - \nLat: " + latitude + "\nLong: " + longitude, Toast.LENGTH_LONG).show();
/* if (gps.canGetLocation()) {
latitude = gps.getLatitude();
longitude = gps.getLongitude();
Toast.makeText(getApplicationContext(), "Your Location is - \nLat: " + latitude + "\nLong: " + longitude, Toast.LENGTH_LONG).show();
} else {
gps.showSettingsAlert();
}*/
Thread thread = new Thread(new Runnable() {
@Override
public void run() {
HttpHeaders requestHeaders = new HttpHeaders();
requestHeaders.add("Cookie", "JSESSIONID=" + StaticRestTemplate.jsessionid);
requestHeaders.setAccept(Collections.singletonList(new MediaType("application", "json")));
HttpEntity<?> requestEntity = new HttpEntity<Object>(requestHeaders);
restTemplate.getMessageConverters().add(new MappingJackson2HttpMessageConverter());
responseEntity = restTemplate.exchange(restaurantList+"/"+longitude+"/"+latitude,
HttpMethod.GET, requestEntity, RestRestaurant[].class);
}
});
thread.start();
ProgressDialog progress = new ProgressDialog(this);
progress.setTitle("Loading");
progress.setMessage("Wait while loading...");
try {
thread.join();
} catch (InterruptedException e) {
e.printStackTrace();
}
progress.dismiss();
RestRestaurant[] restRestaurantList = responseEntity.getBody();
m_orders = new ArrayList<RestRestaurant>();
this.m_adapter = new OrderAdapter(this, android.R.layout.simple_list_item_1, m_orders);
for (RestRestaurant restRestaurant1 : restRestaurantList) {
m_adapter.add(restRestaurant1);
}
setListAdapter(this.m_adapter);
Sekarang, seperti yang Anda lihat di thread, saya melewati garis bujur dan garis lintang. Saya tidak ingin meneruskan data bukan nol di sana.
Berikut adalah kode GPSTracker yang saya gunakan:
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;
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 = 10; // 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;
// First get location from Network Provider
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) {
}
@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;
}
}
Apa yang ingin saya lakukan adalah meminta pengguna untuk mengaktifkan GPS dan kemudian hanya memanggil kode thread dan mengatur adaptor. Saya baru mengenal Android, harap pertimbangkan hal itu. Terima kasih.
