[英]Is there a functionality like the onFirstFix method in the Android Maps Api V2?
I can enable a myLocation View in the new Maps Api through setMyLocationEnabled . 我可以通过setMyLocationEnabled在新的Maps Api中启用myLocation视图。
The first version of the Api had a Method runOnFirstFix that enabled me to animate the map to the users location once the location is found. Api的第一个版本具有方法runOnFirstFix ,该方法使我能够在找到位置后将地图动画化为用户位置。 I can not find a listener or location like that in the Api Version 2. 我找不到Api版本2中的监听器或位置。
Is there a solution to execute an action once the user is located? 一旦找到用户,是否存在执行操作的解决方案?
Google Maps Android API V2 has a LocationSource. Google Maps Android API V2具有LocationSource。 From the docs: 从文档:
"A GoogleMap object has a built-in location provider for its my-location layer, but it can be replaced with another one that implements this interface." “ GoogleMap对象的my-location层具有内置的位置提供程序,但可以用实现该接口的另一个对象来代替。”
I imagine you'll need to use that in conjunction with a LocationSource.OnLocationChangedListener 我想您需要将其与LocationSource.OnLocationChangedListener结合使用
Update 更新资料
Figured it out. 弄清楚了。 If you want to do something similar to runOnFirstFix, here's a basic example that waits until the User's location is available, then animates the map to center on their location. 如果要执行类似于runOnFirstFix的操作,下面是一个基本示例,该示例等待用户可用的位置可用,然后对地图进行动画处理以使其位置居中。
public class MyLocationMapFragmentActivity extends FragmentActivity implements LocationListener, LocationSource
{
/**
* Note that this may be null if the Google Play services APK is not available.
*/
private GoogleMap mMap;
private OnLocationChangedListener mListener;
private LocationManager locationManager;
private Context mContext;
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.basic_map);
this.mContext = this;
locationManager = (LocationManager) getSystemService(LOCATION_SERVICE);
//You may want to pass a different provider in as the first arg here
//depending on the location accuracy that you desire
//see LocationManager.getBestProvider()
Criteria locationCriteria = new Criteria();
locationCriteria.setAccuracy(Criteria.ACCURACY_FINE);
locationManager.requestLocationUpdates(locationManager.getBestProvider(locationCriteria, true), 1L, 2F, this);
setUpMapIfNeeded();
}
@Override
public void onPause()
{
if(locationManager != null)
{
locationManager.removeUpdates(this);
}
super.onPause();
}
@Override
public void onResume()
{
super.onResume();
setUpMapIfNeeded();
if(locationManager != null)
{
mMap.setMyLocationEnabled(true);
}
}
/**
* Sets up the map if it is possible to do so (i.e., the Google Play services APK is correctly
* installed) and the map has not already been instantiated.. This will ensure that we only ever
* call {@link #setUpMap()} once when {@link #mMap} is not null.
* <p>
* If it isn't installed {@link SupportMapFragment} (and
* {@link com.google.android.gms.maps.MapView
* MapView}) will show a prompt for the user to install/update the Google Play services APK on
* their device.
* <p>
* A user can return to this Activity after following the prompt and correctly
* installing/updating/enabling the Google Play services. Since the Activity may not have been
* completely destroyed during this process (it is likely that it would only be stopped or
* paused), {@link #onCreate(Bundle)} may not be called again so we should call this method in
* {@link #onResume()} to guarantee that it will be called.
*/
private void setUpMapIfNeeded() {
// Do a null check to confirm that we have not already instantiated the map.
if (mMap == null)
{
// Try to obtain the map from the SupportMapFragment.
mMap = ((SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.basicMap)).getMap();
// Check if we were successful in obtaining the map.
//This is how you register the LocationSource
mMap.setLocationSource(this);
if (mMap != null)
{
setUpMap();
}
}
}
/**
* This is where we can add markers or lines, add listeners or move the camera. In this case, we
* just add a marker near Africa.
* <p>
* This should only be called once and when we are sure that {@link #mMap} is not null.
*/
private void setUpMap()
{
mMap.setMyLocationEnabled(true);
}
@Override
public void activate(OnLocationChangedListener listener)
{
mListener = listener;
}
@Override
public void deactivate()
{
mListener = null;
}
@Override
public void onLocationChanged(Location location)
{
if( mListener != null )
{
mListener.onLocationChanged( location );
//Move the camera to the user's location once it's available!
mMap.animateCamera(CameraUpdateFactory.newLatLng(new LatLng(location.getLatitude(), location.getLongitude())));
}
}
@Override
public void onProviderDisabled(String provider)
{
// TODO Auto-generated method stub
Toast.makeText(this, "provider disabled", Toast.LENGTH_SHORT).show();
}
@Override
public void onProviderEnabled(String provider)
{
// TODO Auto-generated method stub
Toast.makeText(this, "provider enabled", Toast.LENGTH_SHORT).show();
}
@Override
public void onStatusChanged(String provider, int status, Bundle extras)
{
// TODO Auto-generated method stub
Toast.makeText(this, "status changed", Toast.LENGTH_SHORT).show();
}
}
Update 2 更新2
If you're interested in centering the map on the user's location when their location goes off screen (like MyLocationOverlay does in the old API), see this answer 如果您有兴趣在用户位置不在屏幕上时将地图放在用户的位置中心(例如MyLocationOverlay在旧API中的显示方式),请参见此答案
or this blog post: Google Maps Android API V2 MyLocation LocationSource and event handling 或此博客文章: Google Maps Android API V2 MyLocation LocationSource和事件处理
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