Dustin Dustin - 28 days ago 11
Android Question

Google Maps v2 - set both my location and zoom in

My question is, does anyone know how to set google maps up, to open up both my location and in a zoomed in view?

Currently, the main view opens up to Africa, all the way zoomed out.

And so I have been searching for days now, and all I can find are:

1) You cannot animate two things (like zoom in and go to my location) in one google map? So if I can figure out how to set the zoom before I set the animate, then this problem would be solved. That tend tend to be the issue, you can change one, but not both.

2) I have found other classes that might be useful, but there is no help on how to set up the code so the class can manipulate the google map.

This is the code I have been holding on to so far, some works, some does not. Some I thought might be useful later on.

package com.MYWEBSITE.www;

import com.google.android.gms.maps.CameraUpdateFactory;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.SupportMapFragment;
import com.google.android.gms.maps.model.LatLng;
import android.content.Context;
import android.location.Criteria;
import android.location.Location;
import android.location.LocationManager;
import android.os.Bundle;
import android.support.v4.app.FragmentActivity;
import android.view.Menu;

public class MainActivity extends FragmentActivity {
private GoogleMap map;

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

map = ((SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map)).getMap();
map.setMyLocationEnabled(true);

//LocationSource a = (LocationSource) getSystemService(Context.LOCATION_SERVICE);
//LocationManager b = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
//map.setLocationSource(a);

Criteria criteria = new Criteria();
LocationManager locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
String provider = locationManager.getBestProvider(criteria, false);
Location location = locationManager.getLastKnownLocation(provider);
double lat = location.getLatitude();
double lng = location.getLongitude();
LatLng coordinate = new LatLng(lat, lng);

//CameraPosition.Builder x = CameraPosition.builder();
//x.target(coordinate);
//x.zoom(13);

//Projection proj = map.getProjection();
//Point focus = proj.toScreenLocation(coordinate);

//map.animateCamera(CameraUpdateFactory.newLatLng(coordinate));
map.animateCamera(CameraUpdateFactory.zoomBy(13));
//map.moveCamera(CameraUpdateFactory.newLatLng(coordinate));


////LatLngBounds bounds = mMap.getProjection().getVisibleRegion().latLngBounds;
}
}

Answer

You cannot animate two things (like zoom in and go to my location) in one google map?

From a coding standpoint, you would do them sequentially:

    CameraUpdate center=
        CameraUpdateFactory.newLatLng(new LatLng(40.76793169992044,
                                                 -73.98180484771729));
    CameraUpdate zoom=CameraUpdateFactory.zoomTo(15);

    map.moveCamera(center);
    map.animateCamera(zoom);

Here, I move the camera first, then animate the camera, though both could be animateCamera() calls. Whether GoogleMap consolidates these into a single event, I can't say, as it goes by too fast. :-)

Here is the sample project from which I pulled the above code.


Sorry, this answer is flawed. See Rob's answer for a way to truly do this in one shot, by creating a CameraPosition and then creating a CameraUpdate from that CameraPosition.

Comments