Nathan,
I've written a couple of applications today which are displaying VTPK files without any issues I can see.
Without looking at your code it is hard for me to see what is happening, but I have a few thoughts:
- If you have changed your API level to 23+ then there are changes in Android where you need to do some extra things to get permission to read files. Prior to 23 you could just get away with adding the permission in the manifest. You now need to explicitly request this and a dialog will pop up in your app.
- You say it fails silently, but are you doing anything to capture error conditions? In the done loading listener you can look at the load status. This is what I've crudely added to my listener on the tileCache:
tileCache = new VectorTileCache(Environment.getExternalStorageDirectory() + "/ArcGIS/Samples/TilePackage/vectorTilePackage.vtpk");
tileCache.loadAsync();
tileCache.addDoneLoadingListener(()-> {
Log.e("mb:" , "load status " + tileCache.getLoadStatus());
Log.e("mb:" , "load error " + tileCache.getLoadError());
- The other thought I'm having is around garbage collection. Are you using member variables in your code where you are reading values in a separate thread to where you called loadAsync?
To show you what I mean here is some vulnerable code:
// create feature layer with its service feature table
// create the service feature table
ServiceFeatureTable serviceFeatureTable = new ServiceFeatureTable(
getResources().getString(R.string.sample_service_url));
// create the feature layer using the service feature table
FeatureLayer featureLayer = new FeatureLayer(serviceFeatureTable);
// trigger the layer to load
featureLayer.loadAsync();
// this code gets run on a new thread when the feature is loaded.
featureLayer.addDoneLoadingListener(() -> {
String desc = featureLayer.getDescription();
Toast.makeText(this, "Description: " + desc, Toast.LENGTH_SHORT).show();
});
serviceFeatureTable is a variable which will eventually get garbage collected once it goes out of scope. There is always a possibility if you are unlucky it will get garbage collected before the doneLoadingListener gets fired... it therefore looks like it has silently failed! If serviceFeatureTable is a member of the class this will not happen.
Note sure if any of this helps, but something to be thinking about.
Note that we are always happy to help, but please keep the conversation polite 😉
