I'm making use of the new Android Google Maps API.
I create an activity which includes a MapFragment. In the activity onResume I set the markers into the GoogleMap object and then define a bounding box for the map which includes all of the markers.
This is using the following pseudo code:
LatLngBounds.Builder builder = new LatLngBounds.Builder();
while(data) {
LatLng latlng = getPosition();
builder.include(latlng);
}
CameraUpdate cameraUpdate = CameraUpdateFactory
.newLatLngBounds(builder.build(), 10);
map.moveCamera(cameraUpdate);
The call to map.moveCamera() causes my application to crash with the following stack:
Caused by: java.lang.IllegalStateException:
Map size should not be 0. Most likely, layout has not yet
at maps.am.r.b(Unknown Source)
at maps.y.q.a(Unknown Source)
at maps.y.au.a(Unknown Source)
at maps.y.ae.moveCamera(Unknown Source)
at com.google.android.gms.maps.internal.IGoogleMapDelegate$Stub
.onTransact(IGoogleMapDelegate.java:83)
at android.os.Binder.transact(Binder.java:310)
at com.google.android.gms.maps.internal.IGoogleMapDelegate$a$a
.moveCamera(Unknown Source)
at com.google.android.gms.maps.GoogleMap.moveCamera(Unknown Source)
at ShowMapActivity.drawMapMarkers(ShowMapActivity.java:91)
at ShowMapActivity.onResume(ShowMapActivity.java:58)
at android.app.Instrumentation
.callActivityOnResume(Instrumentation.java:1185)
at android.app.Activity.performResume(Activity.java:5182)
at android.app.ActivityThread
.performResumeActivity(ActivityThread.java:2732)
If – instead of the newLatLngBounds() factory method I use newLatLngZoom() method then the same trap does not occur.
Is the onResume the best place to draw the markers onto the GoogleMap object or should I be drawing the markers and setting the camera position somewhere else?
Best Answer
You can use simple newLatLngBounds method in OnCameraChangeListener. All will be working perfectly and you don't need to calculate screen size. This event occurs after map size calculation (as I understand).
Example: