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[英]How do I set title for user location Marker in android's Google map v2?
[英]How do I update the map marker without changing the zoom that the user has set?
我有一个正在构建的 Android 应用程序,它使用带有位置侦听器的 Google 地图。 当地图第一次出现时,我在位置侦听器中将缩放设置为 12,我在 Google Maps 开发中相当新,所以我想知道如何在用户捏住更改缩放后更新位置而不影响缩放? 下面是我的位置监听器。
/**
*Mylocationlistener class will give the current GPS location
*with the help of Location Listener interface
*/
private class Mylocationlistener implements LocationListener {
@Override
public void onLocationChanged(Location location) {
if (location != null) {
// ---Get current location latitude, longitude---
Log.d("LOCATION CHANGED", location.getLatitude() + "");
Log.d("LOCATION CHANGED", location.getLongitude() + "");
currentLocation = new LatLng(location.getLatitude(), location.getLongitude());
currentLatLng = new LatLng(location.getLatitude(), location.getLongitude());
Marker currentLocationMarker = map.addMarker(new MarkerOptions().position(currentLocation).title("Current Location"));
// Move the camera instantly to hamburg with a zoom of 15.
map.moveCamera(CameraUpdateFactory.newLatLngZoom(currentLatLng, 15));
// Zoom in, animating the camera.
map.animateCamera(CameraUpdateFactory.zoomTo(12), 2000, null);
if (!firstPass){
currentLocationMarker.remove();
}
firstPass = false;
Toast.makeText(MapViewActivity.this,"Latitude = "+
location.getLatitude() + "" +"Longitude = "+ location.getLongitude(),
Toast.LENGTH_LONG).show();
}
}
您可以在侦听器中添加局部变量,并使用它仅缩放第一个位置。 代码如下所示:
private class Mylocationlistener implements LocationListener {
private boolean zoomed = false;
@Override
public void onLocationChanged(Location location) {
if (location != null) {
// ---Get current location latitude, longitude---
Log.d("LOCATION CHANGED", location.getLatitude() + "");
Log.d("LOCATION CHANGED", location.getLongitude() + "");
currentLocation = new LatLng(location.getLatitude(), location.getLongitude());
currentLatLng = new LatLng(location.getLatitude(), location.getLongitude());
Marker currentLocationMarker = map.addMarker(new MarkerOptions().position(currentLocation).title("Current Location"));
// Move the camera instantly to hamburg with a zoom of 15.
map.moveCamera(CameraUpdateFactory.newLatLngZoom(currentLatLng, 15));
// Zoom in, animating the camera.
if (!zoomed) {
map.animateCamera(CameraUpdateFactory.zoomTo(12), 2000, null);
zoomed = true;
}
if (!firstPass){
currentLocationMarker.remove();
}
firstPass = false;
Toast.makeText(MapViewActivity.this,"Latitude = "+
location.getLatitude() + "" +"Longitude = "+ location.getLongitude(),
Toast.LENGTH_LONG).show();
}
}
尝试使用这个:
map.animateCamera(CameraUpdateFactory.newLatLngZoom(currentLocationMarker.getPosition(), map.getCameraPosition().zoom));
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