Java Android Google Maps v2 不显示指南针和位置图标
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Android Google Maps v2 not showing Compass and Location Icon
提问by user2127726
I am not able to show the compassicon and the my locationicon either. I have the code googleMap.getUiSettings.setMyLocationButtonEnabled(true)and googleMap.getUiSettings().setCompassEnabled(true);but it is not showing on the maps.
我也无法显示compass图标和my location图标。我有代码googleMap.getUiSettings.setMyLocationButtonEnabled(true)，googleMap.getUiSettings().setCompassEnabled(true);但它没有显示在地图上。
package com.ctc.weathermap;
import com.google.android.gms.maps.CameraUpdateFactory;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.MapFragment;
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 android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.provider.Settings;
import android.widget.Toast;
public class WeatherMapActivity extends Activity implements LocationListener {
private GoogleMap googleMap;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.weather_maps_main);
LocationManager lm = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
lm.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 0, 0, this);
LocationManager service = (LocationManager) getSystemService(LOCATION_SERVICE);
boolean enabledGPS = service.isProviderEnabled(LocationManager.GPS_PROVIDER);
boolean enabledWiFi = service.isProviderEnabled(LocationManager.NETWORK_PROVIDER);
if (!enabledGPS) {
Toast.makeText(this, "GPS signal not found", Toast.LENGTH_LONG).show();
Intent intent = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
startActivity(intent);
}
else if(!enabledWiFi) {
Toast.makeText(this, "Network signal not found", Toast.LENGTH_LONG).show();
Intent intent = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
startActivity(intent);
}
initializeMap();
googleMap.getUiSettings().setMyLocationButtonEnabled(true);
googleMap.getUiSettings().setCompassEnabled(true);
}
private void initializeMap() {
// check if map is created
if(googleMap == null) {
googleMap = ((MapFragment) getFragmentManager().findFragmentById(R.id.map)).getMap(); // creates the map
// check if map is created successfully or not
if (googleMap == null) {
Toast.makeText(getApplicationContext(),
"Map could not be created", Toast.LENGTH_SHORT)
.show();
}
}
}
@Override
protected void onResume() {
super.onResume();
initializeMap();
}
@Override
public void onLocationChanged(Location location) {
googleMap.clear();
MarkerOptions marker = new MarkerOptions().position(new LatLng(location.getLatitude(), location.getLongitude()));
marker.title("Current location");
marker.icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_CYAN));
googleMap.addMarker(marker);
googleMap.animateCamera(CameraUpdateFactory.newLatLngZoom(new LatLng(location.getLatitude(), location.getLongitude()), 16));
}
@Override
public void onProviderDisabled(String arg0) {
// TODO Auto-generated method stub
}
@Override
public void onProviderEnabled(String arg0) {
// TODO Auto-generated method stub
}
@Override
public void onStatusChanged(String arg0, int arg1, Bundle arg2) {
// TODO Auto-generated method stub
}
}
}
The rest of the code works such as markers and what not. I have tried putting the code for location and compass in initializeMap()but it still does not show up. I would appreciate any help. Thank you!
其余的代码可以工作，例如标记等等。我试过把位置和指南针的代码放进去，initializeMap()但它仍然没有显示出来。我将不胜感激任何帮助。谢谢！
采纳答案by Lal
You havent enabled the my-location layer.Check this linkfor more details
您尚未启用 my-location 图层。查看此链接了解更多详情
So please do
所以请做
googleMap.setMyLocationEnabled(true);
before
前
googleMap.getUiSettings().setMyLocationButtonEnabled(true);
googleMap.getUiSettings().setCompassEnabled(true);
This will make your setMyLocationButtoncome up..
这会让你setMyLocationButton上来..
And,the compass icon will appear only if you rotate the map to not align to north.
而且，仅当您将地图旋转到不与北对齐时才会出现指南针图标。
