我正在创建总线跟踪Android应用程序和下面的代码工作正常。现在我想要的是当公共汽车从一个地方移动到另一个地方时我从m web服务获得新的经度和经度，所以公共汽车显示在新的位置，但它没有从旧地方移除。同样发生在用户当前位置。我想每隔15秒清除用户和公交车的旧位置。我怎样才能做到这一点？
public class MapActivity extends AppCompatActivity implements GoogleApiClient.ConnectionCallbacks,
GoogleApiClient.OnConnectionFailedListener, OnMapReadyCallback, DirectionFinderListener {
private SQLiteHandler db;
private SessionManager session;
LocationRequest mLocationRequest;
GoogleApiClient mGoogleApiClient;
PendingResult<LocationSettingsResult> result;
final static int REQUEST_LOCATION = 199;
ImageView btnPreference, btnLocation, btnPassword, btnProfile;
Spinner spinnerShift, spinnerStops;
List<String> ShiftArrayList = new ArrayList<String>();
final List<Integer> ShiftValueArrayList = new ArrayList<Integer>();
List<String> StopArrayList = new ArrayList<String>();
final List<Integer> StopValueArrayList = new ArrayList<Integer>();
int selected_shift, selected_stop;
GridView gridView;
private List<Routes> routeList = new ArrayList<Routes>();
private CustomListAdapter adapter;
GPSTracker gps;
List<Marker> originMarkers = new ArrayList<>();
List<Marker> currentLoc = new ArrayList<>();
List<Marker> MyLocation1 = new ArrayList<>();
List<Marker> waypointsMarkers = new ArrayList<>();
GoogleMap mMap;
List<Marker> buslocation = new ArrayList<>();
List<Marker> destinationMarkers = new ArrayList<>();
List<Polyline> polylinePaths = new ArrayList<>();
android.os.Handler handler;
boolean doubleBackToExitPressedOnce = false;
ConnectionDetector cd;
Boolean isInternetPresent = false;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_map);
FindViewById();
CheckGpsStatus();
ButtonCLickEvent();
}
public void FindViewById() {
btnPreference = (ImageView) findViewById(R.id.btnPreference);
btnLocation = (ImageView) findViewById(R.id.btnLocation);
btnPassword = (ImageView) findViewById(R.id.btnPassword);
btnProfile = (ImageView) findViewById(R.id.btnProfile);
spinnerShift = (Spinner) findViewById(R.id.spinnerShift);
spinnerStops = (Spinner) findViewById(R.id.spinnerStops);
gridView = (GridView) findViewById(R.id.gridView);
}
public void ButtonCLickEvent() {
btnPreference.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent(MapActivity.this, SetPreferenceActivity.class);
startActivity(intent);
}
});
btnPassword.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent(MapActivity.this, ResetPasswordActivity.class);
startActivity(intent);
}
});
btnProfile.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent(MapActivity.this, ProfileActivity.class);
startActivity(intent);
}
});
}
public void CheckGpsStatus() {
final LocationManager manager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
if (!manager.isProviderEnabled(LocationManager.GPS_PROVIDER)) {
mGoogleApiClient = new GoogleApiClient.Builder(this)
.addApi(LocationServices.API)
.addConnectionCallbacks(this)
.addOnConnectionFailedListener(this).build();
mGoogleApiClient.connect();
cd = new ConnectionDetector(getApplicationContext());
isInternetPresent = cd.isConnectingToInternet();
if (isInternetPresent){
apiShift();
}else {
final SweetAlertDialog alert = new SweetAlertDialog(MapActivity.this, SweetAlertDialog.WARNING_TYPE);
alert.setTitleText("No Internet");
alert.setContentText("Please connect to internet..");
alert.show();
}
handler = new Handler();
handler.postDelayed(runLocation, 15000);
SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager()
.findFragmentById(R.id.map);
mapFragment.getMapAsync(this);
} else {
apiShift();
handler = new Handler();
handler.postDelayed(runLocation, 15000);
SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager()
.findFragmentById(R.id.map);
mapFragment.getMapAsync(this);
}
}
public void apiShift() {
VolleyWebService.makeJsonObjectRequest(MapActivity.this, Request.Method.GET, AppConfig.ShiftData, null, new VolleyResponseListener() {
@Override
public void onResponse(JSONObject response) {
try {
JSONObject jObj = new JSONObject(String.valueOf(response));
JSONArray json_user = jObj.getJSONArray("Message");
for (int i = 0; i < json_user.length(); i++) {
try {
JSONObject obj = json_user.getJSONObject(i);
ShiftArrayList.add(obj.getString("shift_name"));
ShiftValueArrayList.add(Integer.valueOf(obj.getString("shift_id")));
} catch (JSONException e) {
e.printStackTrace();
}
}
ArrayAdapter<String> dataAdapter = new ArrayAdapter<String>(MapActivity.this, R.layout.spinner, ShiftArrayList);
dataAdapter.notifyDataSetChanged();
spinnerShift.setAdapter(dataAdapter);
} catch (JSONException e) {
e.printStackTrace();
}
}
@Override
public void onError(String message) {
Toast.makeText(MapActivity.this, "Server not responding..", Toast.LENGTH_SHORT).show();
}
});
spinnerShift.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
selected_shift = Integer.parseInt(ShiftValueArrayList.get(position).toString());
String shift_id = ShiftValueArrayList.get(position).toString();
apiRoutes(shift_id);
apiStops(shift_id);
}
@Override
public void onNothingSelected(AdapterView<?> parent) {
}
});
}
public void apiStops(final String shiftId) {
String url = AppConfig.StopData + "shift_id=" + shiftId;
VolleyWebService.makeJsonObjectRequest(MapActivity.this, Request.Method.GET, url, null, new VolleyResponseListener() {
@Override
public void onResponse(JSONObject response) {
try {
StopArrayList.clear();
StopValueArrayList.clear();
JSONObject jObj = new JSONObject(String.valueOf(response));
JSONArray json_user = jObj.getJSONArray("Message");
for (int i = 0; i < json_user.length(); i++) {
try {
JSONObject obj = json_user.getJSONObject(i);
StopArrayList.add(obj.getString("stop_name"));
StopValueArrayList.add(Integer.valueOf(obj.getString("stop_id")));
} catch (JSONException e) {
e.printStackTrace();
}
}
ArrayAdapter<String> dataAdapter = new ArrayAdapter<String>(MapActivity.this, R.layout.spinner_stop, StopArrayList);
dataAdapter.notifyDataSetChanged();
spinnerStops.setAdapter(dataAdapter);
} catch (JSONException e) {
e.printStackTrace();
}
}
@Override
public void onError(String message) {
Toast.makeText(MapActivity.this, "Server not responding..", Toast.LENGTH_SHORT).show();
}
});
spinnerStops.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
selected_stop = Integer.parseInt(StopValueArrayList.get(position).toString());
String stop_id = StopValueArrayList.get(position).toString();
apiDrawRoute(shiftId, stop_id);
}
@Override
public void onNothingSelected(AdapterView<?> parent) {
}
});
}
public void apiRoutes(String shift_id) {
String url = AppConfig.RouteData + "shift_id_tabular=" + shift_id;
VolleyWebService.makeJsonObjectRequest(MapActivity.this, Request.Method.GET, url, null, new VolleyResponseListener() {
@Override
public void onResponse(JSONObject response) {
try {
JSONObject mainObj = new JSONObject(String.valueOf(response));
if (mainObj != null) {
routeList.clear();
JSONArray list = mainObj.getJSONArray("Message");
if (list != null) {
for (int i = 0; i < list.length(); i++) {
JSONObject elem = list.getJSONObject(i);
Routes routes = new Routes();
routes.setSrNo(elem.getString("rn"));
routes.setName(elem.getString("location"));
routes.setTime(elem.getString("actual_time"));
routes.setStatus(elem.getString("run_status"));
routeList.add(routes);
}
}
}
}
adapter = new CustomListAdapter(MapActivity.this, routeList);
gridView.setAdapter(adapter);
} catch (JSONException e) {
e.printStackTrace();
}
}
@Override
public void onError(String message) {
Toast.makeText(MapActivity.this, "Server not responding", Toast.LENGTH_SHORT).show();
}
});
}
@Override
public void onConnected(Bundle bundle) {
mLocationRequest = LocationRequest.create();
mLocationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
mLocationRequest.setInterval(30 * 1000);
mLocationRequest.setFastestInterval(5 * 1000);
LocationSettingsRequest.Builder builder = new LocationSettingsRequest.Builder().addLocationRequest(mLocationRequest);
builder.setAlwaysShow(true);
result = LocationServices.SettingsApi.checkLocationSettings(mGoogleApiClient, builder.build());
result.setResultCallback(new ResultCallback<LocationSettingsResult>() {
@Override
public void onResult(LocationSettingsResult result) {
final Status status = result.getStatus();
switch (status.getStatusCode()) {
case LocationSettingsStatusCodes.SUCCESS:
break;
case LocationSettingsStatusCodes.RESOLUTION_REQUIRED:
try {
status.startResolutionForResult(
MapActivity.this,
REQUEST_LOCATION);
} catch (IntentSender.SendIntentException e) {
}
break;
case LocationSettingsStatusCodes.SETTINGS_CHANGE_UNAVAILABLE:
break;
}
}
});
}
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
Log.d("onActivityResult()", Integer.toString(resultCode));
switch (requestCode) {
case REQUEST_LOCATION:
switch (resultCode) {
case Activity.RESULT_OK: {
break;
}
case Activity.RESULT_CANCELED: {
finish();
break;
}
default: {
break;
}
}
break;
}
}
@Override
public void onConnectionSuspended(int i) {
}
@Override
public void onConnectionFailed(ConnectionResult connectionResult) {
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.menu, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
super.onOptionsItemSelected(item);
switch (item.getItemId()) {
case R.id.logout:
db = new SQLiteHandler(getApplicationContext());
session = new SessionManager(getApplicationContext());
session.setLogin(false);
db.deleteUsers();
Intent intent = new Intent(MapActivity.this, LoginActivity.class);
startActivity(intent);
finish();
}
return true;
}
public void apiDrawRoute(String shiftId, String stopId) {
String url = AppConfig.RouteData + "shiftid=" + shiftId + "&stopid=" + stopId;
VolleyWebService.makeJsonObjectRequest(MapActivity.this, Request.Method.GET, url, null, new VolleyResponseListener() {
@Override
public void onResponse(JSONObject response) {
try {
JSONObject jObj = new JSONObject(String.valueOf(response));
JSONArray json_user = jObj.getJSONArray("Message");
for (int i = 0; i < json_user.length(); i++) {
try {
JSONObject obj = json_user.getJSONObject(i);
List<String> wp = new ArrayList<String>();
for (int w1 = 0; w1 < json_user.length(); w1++) {
wp.add(obj.getString("waypoints_latitude") + ',' + obj.getString("waypoints_longitude") + '|');
}
sendRequest(obj.getString("start_location"), obj.getString("end_location"), wp);
} catch (JSONException e) {
e.printStackTrace();
}
}
} catch (JSONException e) {
e.printStackTrace();
}
}
@Override
public void onError(String message) {
Toast.makeText(MapActivity.this, "Server not responding..", Toast.LENGTH_SHORT).show();
}
});
spinnerShift.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
selected_shift = Integer.parseInt(ShiftValueArrayList.get(position).toString());
String shift_id = ShiftValueArrayList.get(position).toString();
apiRoutes(shift_id);
apiStops(shift_id);
}
@Override
public void onNothingSelected(AdapterView<?> parent) {
}
});
}
@Override
public void onMapReady(GoogleMap googleMap) {
mMap = googleMap;
mMap.clear();
MyLocation1.clear();
gps = new GPSTracker(MapActivity.this);
if (gps.CanGetLocation()) {
double latitude = gps.getLatitude();
double longitude = gps.getLongitude();
LatLng mylocation = new LatLng(latitude, longitude);
if (MyLocation1 != null) {
for (Marker marker : MyLocation1) {
marker.remove();
}
}
mMap.moveCamera(CameraUpdateFactory.newLatLngZoom(mylocation, 10));
MyLocation1.add(mMap.addMarker(new MarkerOptions()
.icon(BitmapDescriptorFactory.fromResource(R.drawable.curr_location))
.title("My Location")
.position(mylocation)));
Circle circle = mMap.addCircle(new CircleOptions()
.center(mylocation)
.radius(1000)
.strokeColor(0x10000000)
.fillColor(0x10000000));
} else {
//gps.showSettingsAlert();
}
if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
return;
}
mMap.setMyLocationEnabled(true);
}
public Runnable runLocation = new Runnable() {
@Override
public void run() {
gps = new GPSTracker(MapActivity.this);
MyLocation1.clear();
if (gps.CanGetLocation()) {
double latitude = gps.getLatitude();
double longitude = gps.getLongitude();
LatLng mylocation = new LatLng(latitude, longitude);
if (MyLocation1 != null) {
for (Marker marker : MyLocation1) {
marker.remove();
}
}
MyLocation1.add(mMap.addMarker(new MarkerOptions()
.icon(BitmapDescriptorFactory.fromResource(R.drawable.curr_location))
.title("My Location")
.position(mylocation)));
Circle circle = mMap.addCircle(new CircleOptions()
.center(mylocation)
.radius(1000)
.strokeColor(0x10000000)
.fillColor(0x10000000));
} else {
// gps.showSettingsAlert();
}
String tag_json_obj = "json_obj_req";
String url = AppConfig.RouteData + "i=1&" + "y=1";
JsonObjectRequest jsonObjReq = new JsonObjectRequest(Request.Method.GET, url, null, new Response.Listener<JSONObject>() {
@Override
public void onResponse(JSONObject response) {
try {
JSONObject jObj = new JSONObject(String.valueOf(response));
JSONArray json_user = jObj.getJSONArray("Message");
currentLoc.clear();
for (int i = 0; i < json_user.length(); i++) {
try {
JSONObject obj = json_user.getJSONObject(i);
Double currLat = obj.getDouble("actual_lat");
Double currLong = obj.getDouble("actual_long");
LatLng hcmus = new LatLng(currLat, currLong);
currentLoc.add(mMap.addMarker(new MarkerOptions()
.icon(BitmapDescriptorFactory.fromResource(R.drawable.bus))
.title("Bus No" + obj.getString("bus_id"))
.position(hcmus)));
} catch (JSONException e) {
e.printStackTrace();
}
}
} catch (JSONException e) {
e.printStackTrace();
}
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
Toast.makeText(MapActivity.this, "Server not responding..", Toast.LENGTH_SHORT).show();
}
});
// Adding request to request queue
AppController.getInstance().addToRequestQueue(jsonObjReq, tag_json_obj);
MapActivity.this.handler.postDelayed(MapActivity.this.runLocation, 15000);
}
};
private void sendRequest(String Sl, String El, List Wp) {
String origin = Sl.toString();
String destination = El.toString();
List waypoints = Wp;
if (origin.isEmpty()) {
Toast.makeText(this, "Please enter origin address!", Toast.LENGTH_SHORT).show();
return;
}
if (destination.isEmpty()) {
Toast.makeText(this, "Please enter destination address!", Toast.LENGTH_SHORT).show();
return;
}
try {
new DirectionFinder(MapActivity.this, origin, destination, waypoints).execute();
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
}
@Override
public void onDirectionFinderStart() {
if (originMarkers != null) {
for (Marker marker : originMarkers) {
marker.remove();
}
}
if (destinationMarkers != null) {
for (Marker marker : destinationMarkers) {
marker.remove();
}
}
if (polylinePaths != null) {
for (Polyline polyline : polylinePaths) {
polyline.remove();
}
}
}
@Override
public void onDirectionFinderSuccess(List<Route> routes) {
polylinePaths = new ArrayList<>();
originMarkers = new ArrayList<>();
destinationMarkers = new ArrayList<>();
waypointsMarkers = new ArrayList<>();
buslocation = new ArrayList<>();
mMap.clear();
for (Route route : routes) {
mMap.moveCamera(CameraUpdateFactory.newLatLngZoom(route.startLocation, 16));
((TextView) findViewById(R.id.tvDuration)).setText(route.duration.text);
((TextView) findViewById(R.id.tvDistance)).setText(route.distance.text);
originMarkers.add(mMap.addMarker(new MarkerOptions()
.icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_GREEN))
.title(route.startAddress)
.position(route.startLocation)));
// waypointsMarkers.add(mMap.addMarker(new MarkerOptions()
// .icon(BitmapDescriptorFactory.fromResource(R.drawable.end_green))
// .title(route.waypointsAddress)
// .position(route.waypointsLocation)));
for (int i = 0; i < route.jlegs.size(); i++) {
destinationMarkers.add(mMap.addMarker(new MarkerOptions()
.icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_ROSE))
.title(route.jaddress.get(i))
.position(route.jlegs.get(i))));
}
destinationMarkers.add(mMap.addMarker(new MarkerOptions()
.icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_ROSE))
.title(route.endAddress)
.position(route.endLocation)));
// final LatLng MELBOURNE = new LatLng(24.571982, 73.725597);
// buslocation.add(mMap.addMarker(new MarkerOptions()
// .icon(BitmapDescriptorFactory.fromResource(R.drawable.bus))
// .title("Bus Location")
// .position(MELBOURNE)));
// final LatLng MELBOURNE = new LatLng(24.571982, 73.725597);
PolylineOptions polylineOptions = new PolylineOptions().
geodesic(true).
color(Color.BLUE).
width(5);
for (int i = 0; i < route.points.size(); i++)
polylineOptions.add(route.points.get(i));
polylinePaths.add(mMap.addPolyline(polylineOptions));
// setUpMapIfNeeded();
}
}
@Override
public void onBackPressed() {
if (doubleBackToExitPressedOnce) {
super.onBackPressed();
return;
}
this.doubleBackToExitPressedOnce = true;
Toast.makeText(this, "Please click BACK again to exit", Toast.LENGTH_SHORT).show();
new Handler().postDelayed(new Runnable() {
@Override
public void run() {
doubleBackToExitPressedOnce = false;
}
}, 2000);
}
}
答案 0 :(得分：2)
在每次更新时清理并重新加载您的位置列表。！