使用ParseGeoPoint在地图中显示标记
此刻，我很难将标记放置在地图上。我想做一个应用程序，在其中我可以追踪自己走过的路。您能帮我一个链接来完成此操作吗，给定先前的代码，如何将标记放置在地图上？
我遵循https://www.back4app.com/docs/android/parse-geopoint中的解析指南，但这似乎不起作用。
这是我到目前为止所做的...
package com.example.mac.mycarapp.Fragment;
import android.Manifest;
import android.content.Context;
import android.content.pm.PackageManager;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.support.v4.app.ActivityCompat;
import android.support.v4.app.FragmentActivity;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import com.example.mac.mycarapp.R;
import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.common.api.GoogleApiClient;
import com.google.android.gms.location.LocationRequest;
import com.google.android.gms.location.LocationServices;
import com.google.android.gms.maps.CameraUpdateFactory;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.OnMapReadyCallback;
import com.google.android.gms.maps.SupportMapFragment;
import com.google.android.gms.maps.model.BitmapDescriptorFactory;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.MarkerOptions;
import com.parse.ParseGeoPoint;
import com.parse.ParseUser;
public class PruebaDeRutaMapsActivity extends FragmentActivity implements OnMapReadyCallback,
GoogleApiClient.ConnectionCallbacks, GoogleApiClient.OnConnectionFailedListener, com.google.android.gms.location.LocationListener {
private GoogleMap mMap;
private GoogleApiClient mGoogleApiClient;
Location mLastLocation;
LocationRequest mLocationRequest;
private static final int REQUEST_LOCATION = 1;
LocationManager locationManager;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_prueba_de_ruta_maps);
// Obtain the SupportMapFragment and get notified when the map is ready to be used.
SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map);
mapFragment.getMapAsync(this);
locationManager = (LocationManager)getSystemService(Context.LOCATION_SERVICE);
}
/**
* Manipulates the map once available.
* This callback is triggered when the map is ready to be used.
* This is where we can add markers or lines, add listeners or move the camera. In this case,
* we just add a marker near Sydney, Australia.
* If Google Play services is not installed on the device, the user will be prompted to install
* it inside the SupportMapFragment. This method will only be triggered once the user has
* installed Google Play services and returned to the app.
*/
@Override
public void onMapReady(GoogleMap googleMap) {
mMap = googleMap;
if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
// TODO: Consider calling
// ActivityCompat#requestPermissions
// here to request the missing permissions, and then overriding
// public void onRequestPermissionsResult(int requestCode, String[] permissions,
// int[] grantResults)
// to handle the case where the user grants the permission. See the documentation
// for ActivityCompat#requestPermissions for more details.
return;
}
buildGoogleApiClient();
mMap.setMyLocationEnabled(true);
ParseGeoPoint loc=getCurrentUserLocation();
// Add a marker in Sydney and move the camera
showCurrentUserInMap(googleMap);
}
protected synchronized void buildGoogleApiClient() {
mGoogleApiClient=new GoogleApiClient.Builder(this)
.addConnectionCallbacks(this)
.addOnConnectionFailedListener(this)
.addApi(LocationServices.API)
.build();
mGoogleApiClient.connect();
}
@Override
public void onLocationChanged(Location location) {
mLastLocation=location;
LatLng latLng=new LatLng(location.getLatitude(),location.getLongitude());
mMap.moveCamera(CameraUpdateFactory.newLatLng(latLng));
/** Jugar con el valor de ZoomTo para obtener el valor deseado va de 1 a 21*/
mMap.animateCamera(CameraUpdateFactory.zoomTo(11));
//TODO:Agregar la localizacion a la base de datos
//https://www.back4app.com/docs/android/parse-geopoint
if(location != null){
// if it isn't, save it to Back4App Dashboard
ParseUser currentUser = ParseUser.getCurrentUser();
if (currentUser != null) {
saveCurrentUserLocation();
} else {
// do something like coming back to the login activity
}
}
else {
// if it is null, do something like displaying error and coming back to the menu activity
}
}
/** When the map is connected and the location is being requested*/
@Override
public void onConnected(@Nullable Bundle bundle) {
mLocationRequest = new LocationRequest();
mLocationRequest.setInterval(1000);
mLocationRequest.setFastestInterval(1000);
/**
* OJO si esta puesto en high drenara mas rapido la bateria del dispositivo*/
mLocationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
// TODO: Consider calling
// ActivityCompat#requestPermissions
// here to request the missing permissions, and then overriding
// public void onRequestPermissionsResult(int requestCode, String[] permissions,
// int[] grantResults)
// to handle the case where the user grants the permission. See the documentation
// for ActivityCompat#requestPermissions for more details.
return;
}
LocationServices.FusedLocationApi.requestLocationUpdates(mGoogleApiClient, mLocationRequest, this);
}
@Override
public void onConnectionSuspended(int i) {
}
@Override
public void onConnectionFailed(@NonNull ConnectionResult connectionResult) {
}
@Override
public void onPointerCaptureChanged(boolean hasCapture) {
}
private void saveCurrentUserLocation() {
// requesting permission to get user's location
if (ActivityCompat.checkSelfPermission(PruebaDeRutaMapsActivity.this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(PruebaDeRutaMapsActivity.this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
ActivityCompat.requestPermissions(PruebaDeRutaMapsActivity.this, new String[]{android.Manifest.permission.ACCESS_FINE_LOCATION}, REQUEST_LOCATION);
} else {
// getting last know user's location
Location location = locationManager.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
// checking if the location is null
if (location != null) {
// if it isn't, save it to Back4App Dashboard
ParseGeoPoint currentUserLocation = new ParseGeoPoint(location.getLatitude(), location.getLongitude());
ParseUser currentUser = ParseUser.getCurrentUser();
if (currentUser != null) {
currentUser.put("Location", currentUserLocation);
currentUser.saveInBackground();
} else {
// do something like coming back to the login activity
}
} else {
// if it is null, do something like displaying error and coming back to the menu activity
}
}
}
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults)
{
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
switch (requestCode) {
case REQUEST_LOCATION:
saveCurrentUserLocation();
break;
}
}
private ParseGeoPoint getCurrentUserLocation(){
// finding currentUser
ParseUser currentUser = ParseUser.getCurrentUser();
if (currentUser == null) {
// if it's not possible to find the user, do something like returning to login activity
}
// otherwise, return the current user location
return currentUser.getParseGeoPoint("Location");
}
private void showCurrentUserInMap(final GoogleMap googleMap){
// calling retrieve user's location method of Step 4
ParseGeoPoint currentUserLocation = getCurrentUserLocation();
// creating a marker in the map showing the current user location
LatLng currentUser = new LatLng(currentUserLocation.getLatitude(), currentUserLocation.getLongitude());
googleMap.addMarker(new MarkerOptions().position(currentUser).title(ParseUser.getCurrentUser().getUsername()).icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_RED)));
// zoom the map to the currentUserLocation
googleMap.animateCamera(CameraUpdateFactory.newLatLngZoom(currentUser, 5));
}
}
1 个答案:
答案 0 :(得分：0)
您需要确保每次有新位置时都在更新地图。尝试更改此方法：
@Override
public void onLocationChanged(Location location) {
mLastLocation=location;
LatLng latLng=new LatLng(location.getLatitude(),location.getLongitude());
mMap.moveCamera(CameraUpdateFactory.newLatLng(latLng));
/** Jugar con el valor de ZoomTo para obtener el valor deseado va de 1 a 21*/
mMap.animateCamera(CameraUpdateFactory.zoomTo(11));
//TODO:Agregar la localizacion a la base de datos
//https://www.back4app.com/docs/android/parse-geopoint
if(location != null){
// if it isn't, save it to Back4App Dashboard
ParseUser currentUser = ParseUser.getCurrentUser();
if (currentUser != null) {
saveCurrentUserLocation();
showCurrentUserInMap(mMap);
} else {
// do something like coming back to the login activity
}
}
else {
// if it is null, do something like displaying error and coming back to the menu activity
}
}
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