为什么标记没有出现？ [英] Why do the markers not appear?

问题描述

我所拥有的：带有餐馆，酒吧等图像的RecyclerView，点击时会带您到地图

What I have: A RecyclerView with images of Restaurants, Bars, etc, that when are clicked take you to a map

我想要的是：当他们成为时点击进入带有标记的地图，上面有你说过的地方

What I want: That when they be clicked take you to a map with markers with said places around you

我的问题：我在另一个应用程序中做了这个，但是另一个应用程序直接显示了你当前位置的地图当你点击按钮显示我想要的信息。但我试图在这个应用程序上添加请求的方法，但标记没有显示

My problem: I did this in another app but the other app showed you directly a map with your current location and when you clicked the buttons showed the info I want. But I have tried to do this on this app adding the request on a method but the markers doesn't shows up

我的问题：为什么标记没有显示？ 。如果解释附带代码示例，我将非常感谢，提前谢谢

My question: Why Markers doesn't show up?. I would really appreciate if the explanation comes with code example, thanks in advance

我以前如何做我的请求

    public class MapsActivity extends FragmentActivity implements OnMapReadyCallback,
        GoogleApiClient.ConnectionCallbacks,
        GoogleApiClient.OnConnectionFailedListener,
        LocationListener {

@Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_maps);

        if (android.os.Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
            checkLocationPermission();
        }

        //Check if Google Play Services Available or not
        if (!CheckGooglePlayServices()) {
            Log.d("onCreate", "Finishing test case since Google Play Services are not available");
            finish();
        }
        else {
            Log.d("onCreate","Google Play Services available.");
        }

        // 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);
    }

 @Override
    public void onMapReady(GoogleMap googleMap) {//esta funcion es llamada cuando el mapa esta listo para usarse(1- locacion)
        mMap = googleMap;
        mMap.setMapType(GoogleMap.MAP_TYPE_NORMAL);//esto es lo que que dice de que forma queremos que se vea el mapa

        //Initialize Google Play Services
        if (android.os.Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
            if (ContextCompat.checkSelfPermission(this,
                    Manifest.permission.ACCESS_FINE_LOCATION)
                    == PackageManager.PERMISSION_GRANTED) {
                buildGoogleApiClient();
                mMap.setMyLocationEnabled(true);
            }
        }
        else {
            buildGoogleApiClient();
            mMap.setMyLocationEnabled(true);
        }
  //REQUEST TRIGGERED BY BUTTON
            Button btnRestaurant = (Button) findViewById(R.id.btnRestaurant);//asi se hace la peticion
            btnRestaurant.setOnClickListener(new View.OnClickListener() {
                String Restaurant = "restaurant";
                @Override
                public void onClick(View v) {
                    Log.d("onClick", "Button is Clicked");
                    mMap.clear();
                    String url = getUrl(latitude, longitude, Restaurant);
                    Object[] DataTransfer = new Object[2];
                    DataTransfer[0] = mMap;
                    DataTransfer[1] = url;
                    Log.d("onClick", url);
                    GetNearbyPlacesData getNearbyPlacesData = new GetNearbyPlacesData();
                    getNearbyPlacesData.execute(DataTransfer);
                    Toast.makeText(MapsActivity.this,"Nearby Restaurants", Toast.LENGTH_LONG).show();
                }
            });

我如何尝试执行我的请求

How I am trying to do my request

 public class MapsActivity extends FragmentActivity implements OnMapReadyCallback,
        GoogleApiClient.ConnectionCallbacks,
        GoogleApiClient.OnConnectionFailedListener,
        LocationListener {

private static final String EXTRA_TRIGGER_METHOD = "trigger_method";

    public static Intent getIntent(Context context, boolean triggerMethod) {
        Intent intent = new Intent(context, MapsActivity.class);
        intent.putExtra(EXTRA_TRIGGER_METHOD, triggerMethod);
        return intent;
    }

    private boolean triggerMethod;
@Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_maps);

        if (android.os.Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
            checkLocationPermission();
        }

        //Check if Google Play Services Available or not
        if (!CheckGooglePlayServices()) {
            Log.d("onCreate", "Finishing test case since Google Play Services are not available");
            finish();
        }
        else {
            Log.d("onCreate","Google Play Services available.");
        }

        // 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);

        triggerMethod = getIntent().getBooleanExtra(EXTRA_TRIGGER_METHOD, false);

        if (triggerMethod) {
            Method();
        }
    }
 //REQUEST TRIGGERED BY METHOD    
    public void Method(){
            String Restaurant = "restaurant";
                    //mMap.clear();
                    String url = getUrl(latitude, longitude, Restaurant);
                    Object[] DataTransfer = new Object[2];
                    DataTransfer[0] = mMap;
                    DataTransfer[1] = url;
                    Log.d("onClick", url);
                    GetNearbyPlacesData getNearbyPlacesData = new GetNearbyPlacesData();
                    getNearbyPlacesData.execute(DataTransfer);
                    Toast.makeText(MapsActivity.this,"Nearby Restaurants", Toast.LENGTH_LONG).show();
        }

我添加标记的类

    public class GetNearbyPlacesData extends AsyncTask<Object, String, String> {

    String googlePlacesData;
    GoogleMap mMap;
    String url;

    @Override
    protected String doInBackground(Object... params) {
        try {
            Log.d("GetNearbyPlacesData", "doInBackground entered");
            mMap = (GoogleMap) params[0];
            url = (String) params[1];
            DownloadUrl downloadUrl = new DownloadUrl();
            googlePlacesData = downloadUrl.readUrl(url);
            Log.d("GooglePlacesReadTask", "doInBackground Exit");
        } catch (Exception e) {
            Log.d("GooglePlacesReadTask", e.toString());
        }
        return googlePlacesData;
    }

    @Override
    protected void onPostExecute(String result) {
        Log.d("GooglePlacesReadTask", "onPostExecute Entered");
        List<HashMap<String, String>> nearbyPlacesList = null;
        DataParser dataParser = new DataParser();
        nearbyPlacesList =  dataParser.parse(result);
        ShowNearbyPlaces(nearbyPlacesList);
        Log.d("GooglePlacesReadTask", "onPostExecute Exit");
    }

    private void ShowNearbyPlaces(List<HashMap<String, String>> nearbyPlacesList) {
        for (int i = 0; i < nearbyPlacesList.size(); i++) {
            Log.d("onPostExecute","Entered into showing locations");
            MarkerOptions markerOptions = new MarkerOptions();
            HashMap<String, String> googlePlace = nearbyPlacesList.get(i);
            double lat = Double.parseDouble(googlePlace.get("lat"));
            double lng = Double.parseDouble(googlePlace.get("lng"));
            String placeName = googlePlace.get("place_name");
            String vicinity = googlePlace.get("vicinity");
            LatLng latLng = new LatLng(lat, lng);
            MarkerOptions options = new MarkerOptions();
            //options.position(LatLng);options.icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_RED));
            options.title("Restaurante");
            options.snippet("Burger King");
            mMap.addMarker(options);
            markerOptions.position(latLng);
            markerOptions.title(placeName + " : " + vicinity);
            mMap.addMarker(markerOptions);//esto añade los marcadores
            markerOptions.icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_RED));//aqui se le pone el color a los marcadores
            //move map camera
            mMap.moveCamera(CameraUpdateFactory.newLatLng(latLng));
            mMap.animateCamera(CameraUpdateFactory.zoomTo(15));
        }
    }
}

推荐答案

我的代码中没有看到任何 Marker ，但只是尝试一下，创建并添加 Marker 喜欢这样，看看它是否在你的地图上

I don't see any Marker in your code, but just to try it, create and add a Marker like this and see if it is on your map

MarkerOptions options = new MarkerOptions();
options.position(latitude,longitude);options.icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_RED));
options.title("Restaurante");
options.snippet("Burger King");
mMap.addMarker(options);

编辑

尝试更改此代码

Edit

Try to change this code

MarkerOptions options = new MarkerOptions();   //options.position(LatLng);options.icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_RED));
            options.title("Restaurante");
            options.snippet("Burger King");
            mMap.addMarker(options);
            markerOptions.position(latLng);
            markerOptions.title(placeName + " : " + vicinity);
            mMap.addMarker(markerOptions);//esto añade los marcadores
            markerOptions.icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_RED));//aqui se le pone el color a los marcadores

到这一个

MarkerOptions options = new MarkerOptions();
options.position(latLng);
options.icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_RED));
options.title(placeName + " : " + vicinity);
mMap.addMarker(options);

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