Saving multiple Markers through SharedPreferences - android-studio

Question

I have found some tuts on how to do add multiple markers on your map fragment. But in my case, It seems that it doesn't work for me, well I can put multiple markers but whenever I restart the application those markers that was save through sharedpreferences is gone.
#Override
public void onMapReady(GoogleMap googleMap) {
mMap = googleMap;
if (ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_GRANTED) {
buildGoogleApiClient();
mMap.setMyLocationEnabled(true);
}
mMap.setMyLocationEnabled(true);
prefs = this.getSharedPreferences("location", 0);
locationCount = prefs.getInt("locationCount", 0);
if(locationCount != 0){
String lat = "";
String lng = "";
for (int i = 0; i < locationCount; i++) {
lat = prefs.getString("Lat" + i,"0");
lng = prefs.getString("Lng" + i, "0");
drawMaker(new LatLng(Double.parseDouble(lat), Double.parseDouble(lng)));
}
}
mMap.setOnMapClickListener(new GoogleMap.OnMapClickListener() {
#Override
public void onMapClick(#NonNull LatLng latLng) {
locationCount++;
drawMaker(latLng);
SharedPreferences.Editor editor = prefs.edit();
editor.putString("lat" + Integer.toString((locationCount - 1)), Double.toString(latLng.latitude));
editor.putString("lng" + Integer.toString((locationCount - 1)), Double.toString(latLng.longitude));
editor.putInt("locationCount", locationCount);
editor.commit();
Toast.makeText(MapsActivity.this, "Marker is added to the Map", Toast.LENGTH_SHORT).show();
}
});
mMap.setOnMapLongClickListener(new GoogleMap.OnMapLongClickListener() {
#Override
public void onMapLongClick(#NonNull LatLng latLng) {
mMap.clear();
SharedPreferences.Editor editor = prefs.edit();
editor.clear();
editor.commit();
locationCount = 0;
}
});