所以基本上，我有一个用于标记的custominfowindow，我希望它显示草皮的标题以及它与当前位置的距离
所以标题很好，但我的代码片段却不正确，它显示为空白
我真的很困惑我现在应该做的事情，我看了很多教程和阅读论坛，而我却遇到了麻烦
先谢谢您！
这是我的mapsactivity.java
package com.example.turftest4;
import android.Manifest;
import android.annotation.SuppressLint;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.nfc.Tag;
import android.os.Build;
import android.support.annotation.NonNull;
import android.support.v4.app.ActivityCompat;
import android.support.v4.app.FragmentActivity;
import android.os.Bundle;
import android.support.v4.content.ContextCompat;
import android.util.Log;
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.Marker;
import com.google.android.gms.maps.model.MarkerOptions;
import java.util.ArrayList;
import java.util.List;
import java.math.BigDecimal;
import static java.lang.Math.round;
public class MapsActivity extends FragmentActivity implements OnMapReadyCallback, GoogleMap.OnMyLocationClickListener, GoogleMap.OnMyLocationButtonClickListener, GoogleMap.OnInfoWindowClickListener, GoogleMap.OnMarkerClickListener {
public static GoogleMap mMap;
public static String s;
public static List<Marker> markerList = new ArrayList<>();
MarkerOptions markerOptions = new MarkerOptions();
private LocationManager locationManager;
public LocationListener locationListener;
private static final LatLng DreamSportsBorivali = new LatLng(19.240277, 72.847462
);
private static LatLng UnitedSportsFieldBorivali = new LatLng(19.243000, 72.843879
);
private static LatLng JBTurfBorivali = new LatLng(19.241748, 72.839832
);
private static LatLng OrlemLawnTurfMalad = new LatLng(19.195776, 72.837971
);
private Marker mDreamSportsBorivali;
private Marker mUnitedSportsFieldBorivali;
private Marker mJBTurfBorivali;
private Marker mOrlemLawnTurfMalad;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_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);
}
/**
* 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.
*/
@SuppressLint("MissingPermission")
@Override
public void onMapReady(GoogleMap googleMap) {
mMap = googleMap;
mMap.getUiSettings().setZoomControlsEnabled(true);
mMap.setMyLocationEnabled(true);
mMap.setOnMyLocationButtonClickListener(this);
mMap.setOnMyLocationClickListener(this);
mMap.setInfoWindowAdapter(new CustomInfoWindow(getApplicationContext()));
LatLng Mumbai = new LatLng(19.0760, 72.8777);
mMap.moveCamera(CameraUpdateFactory.newLatLngZoom(Mumbai,10));
locationManager = (LocationManager) getSystemService(LOCATION_SERVICE);
locationListener = new LocationListener() {
@Override
public void onLocationChanged(Location location) {
LatLng currentLocation = new LatLng(location.getLatitude(), location.getLongitude());
}
@Override
public void onStatusChanged(String provider, int status, Bundle extras) {
}
@Override
public void onProviderEnabled(String provider) {
}
@Override
public void onProviderDisabled(String provider) {
}
};
if (Build.VERSION.SDK_INT < 23) {
locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, locationListener);
} else if (ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.ACCESS_FINE_LOCATION}, 1);
} else {
locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, locationListener);
}
mDreamSportsBorivali = mMap.addMarker(new MarkerOptions().position(DreamSportsBorivali).title("Dream Sports Borivali"));
mDreamSportsBorivali.setTag(0);
markerList.add(mDreamSportsBorivali);
mUnitedSportsFieldBorivali = mMap.addMarker(new MarkerOptions().position(UnitedSportsFieldBorivali).title("United Sports Field Borivali"));
mUnitedSportsFieldBorivali.setTag(0);
markerList.add(mUnitedSportsFieldBorivali);
mJBTurfBorivali = mMap.addMarker(new MarkerOptions().position(JBTurfBorivali).title("JB Turf Borivali"));
mJBTurfBorivali.setTag(0);
markerList.add(mJBTurfBorivali);
mOrlemLawnTurfMalad = mMap.addMarker(new MarkerOptions().position(OrlemLawnTurfMalad).title("Orlem Lawn Turf Malad"));
mOrlemLawnTurfMalad.setTag(0);
markerList.add(mOrlemLawnTurfMalad);
/*for(int i = 0 ; i < markerList.size() ; i++)
{
Location startLoc = locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);
Location endLocation = new Location(LocationManager.GPS_PROVIDER);
LatLng latlng = new LatLng(markerList.get(i).getPosition().latitude, markerList.get(i).getPosition().longitude);
endLocation.setLatitude(latlng.latitude);
endLocation.setLongitude(latlng.longitude);
double distance = round(((startLoc.distanceTo(endLocation))/1000)*100.0)/100.0;
s[i] = String.valueOf(distance);
mMap.addMarker(new MarkerOptions().position(latlng).icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_CYAN)));
Log.d(s[i],"kms");
}*/
for(Marker m : markerList)
{
Location startLoc = locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);
Location endLocation = new Location(LocationManager.GPS_PROVIDER);
LatLng latlng = new LatLng(m.getPosition().latitude, m.getPosition().longitude);
endLocation.setLatitude(latlng.latitude);
endLocation.setLongitude(latlng.longitude);
double distance = round(((startLoc.distanceTo(endLocation))/1000)*100.0)/100.0;
s = String.valueOf(distance);
Log.d(s,"kms");
markerOptions.position(latlng).icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_CYAN)).snippet("Distance : "+s);
Marker marker = mMap.addMarker(markerOptions);
marker.setTag(m);
}
// Add a marker in Sydney and move the camera
//LatLng sydney = new LatLng(-34, 151);
//mMap.addMarker(new MarkerOptions().position(sydney).title("Marker in Sydney"));
//mMap.moveCamera(CameraUpdateFactory.newLatLng(sydney));
}
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
if(grantResults.length>0 && grantResults[0]==PackageManager.PERMISSION_GRANTED)
if(ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION)==PackageManager.PERMISSION_GRANTED)
locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, locationListener);
}
@Override
public void onMyLocationClick(@NonNull Location location) {
}
@Override
public boolean onMyLocationButtonClick() {
return false;
}
@Override
public void onInfoWindowClick(Marker marker) {
}
@Override
public boolean onMarkerClick(Marker marker) {
return false;
}
}
这是我的custominfowindow
package com.example.turftest4;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.TextView;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.model.Marker;
import org.w3c.dom.Text;
public class CustomInfoWindow extends MapsActivity implements GoogleMap.InfoWindowAdapter {
private View view;
private LayoutInflater layoutInflater;
private Context context;
public CustomInfoWindow(Context context) {
this.context = context;
layoutInflater = (LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
view = layoutInflater.inflate(R.layout.custom_info_window, null);
}
@Override
public View getInfoWindow(Marker marker) {
return null;
}
@Override
public View getInfoContents(Marker marker) {
TextView title = (TextView) view.findViewById(R.id.turftitle);
title.setText(marker.getTitle());
TextView dist = (TextView) view.findViewById(R.id.distance);
dist.setText(marker.getSnippet());
return view;
}
}