android-maps-utils: App freezes when loading KML layer

I am trying to add KML layer on to the maps. It was working okay with just a ms of freeze when i try to load the small size KML file. But some files are large with size more than 1Mb - 10Mb… in these all cases app is getting frozen for some time while the layer is adding to the map.

Below is the Asynctask class i am using to read the kml file from local storage path and adding it to maps.

I tried this in many ways using handlers, threads, asynctasks… as i cannot update the UI in background thread… this is causing my app to freeze for some time.

Eventhough it freezes I wouldn’t mind but in some device while the app is frozen if the user interacts with the app then app is getting crashed. In some devices it is displaying “wait” dialog.

Please help me out.

` private static class AddKMLLayerToMaps extends AsyncTask<String, String, KmlLayer> {

    //added weakreference to avoid memory leaks
    private WeakReference<CoverageFragment> weakReferencedFragment;

    AddKMLLayerToMaps(CoverageFragment reference) {

        this.weakReferencedFragment = new WeakReference<>(reference);

        weakReferencedFragment.get().showLoading();
    }

    @Override
    protected KmlLayer doInBackground(String... strings) {

        try {

            TraceUtils.logE("Coverage kml Path", strings[0]);

            FileInputStream fileInputStream = new FileInputStream(strings[0]);

            CoverageFragment fragment = weakReferencedFragment.get();
            if (fragment == null || fragment.getActivity() == null || fragment.getActivity().isFinishing()) {
                return null;
            }

            KmlLayer kmlLayer = new KmlLayer(fragment.mMap, fileInputStream, getApplicationContext());

            fileInputStream.close();

            File file = new File(strings[0]);
            if (file.exists()) file.delete();

            return kmlLayer;

        } catch (Exception e) {

            weakReferencedFragment.get().hideLoading();

            TraceUtils.logException(e);

        }

        return null;
    }

    @Override
    protected void onPostExecute(KmlLayer kmlLayer) {

        super.onPostExecute(kmlLayer);

        if (kmlLayer != null) {

            //add the KML layer to map using the UI thread
            weakReferencedFragment.get().mActivity.runOnUiThread(() -> {
                try {

                    kmlLayer.addLayerToMap();

                } catch (Exception e) {

                    weakReferencedFragment.get().hideLoading();

                    TraceUtils.logException(e);

                }
            });

            //zoom to the center of KML layer containers
            new MoveMapToKMLLayer(weakReferencedFragment.get()).execute(kmlLayer);
        }
    }

}`