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我想在我的應用程序中添加多個標記。我曾嘗試使用以下代碼添加一個標記:如何在Android中的谷歌地圖添加多個標記?
import android.location.Criteria;
import android.location.Location;
import android.location.LocationManager;
import android.support.v4.app.FragmentActivity;
import android.os.Bundle;
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.List;
public class MapsActivity extends FragmentActivity implements OnMapReadyCallback {
private GoogleMap mMap;
LocationManager mLocationManager;
@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.
*/
@Override
public void onMapReady(GoogleMap googleMap) {
mMap = googleMap;
Location location = getLastKnownLocation();
LatLng userLocation = new LatLng(location.getLatitude(),location.getLongitude());
mMap.addMarker(new MarkerOptions().position(userLocation).title("You are here."));
mMap.moveCamera(CameraUpdateFactory.newLatLng(userLocation));
}
private Location getLastKnownLocation() {
mLocationManager = (LocationManager) getApplicationContext().getSystemService(LOCATION_SERVICE);
List<String> providers = mLocationManager.getProviders(true);
Location bestLocation = null;
for (String provider : providers) {
Location l = mLocationManager.getLastKnownLocation(provider);
if (l == null) {
continue;
}
if (bestLocation == null || l.getAccuracy() < bestLocation.getAccuracy()) {
// Found best last known location: %s", l);
bestLocation = l;
}
}
return bestLocation;
}
}
以下代碼正常工作。現在,我想添加多個標記。我試圖加入這些標記
public void onMapReady(GoogleMap googleMap) {
mMap = googleMap;
Location location = getLastKnownLocation();
LatLng userLocation = new LatLng(location.getLatitude(),location.getLongitude());
mMap.addMarker(new MarkerOptions().position(userLocation).title("You are here."));
mMap.addMarker(new MarkerOptions().position(new LatLng(100,100)).title("You are here."));
mMap.addMarker(new MarkerOptions().position(new LatLng(150,150)).title("You are here."));
mMap.moveCamera(CameraUpdateFactory.newLatLng(userLocation));
}
但它不能正常工作。屏幕上只顯示一個標記。
哪些代碼不工作?首先正確描述你的問題 –
我沒有在屏幕上看到多個標記。 – learner
我只看到一個標記? –