vandy-add-2-ImageDownloader

Overview

1. The original resource is from gitlab.com/vandy-aad-2/ImageDownloader
2. At the point of investigating the source file mentioned above, there were few missing implementations and relevent comments
3. The source files in this repository has been updated with the missing implementations and relevant comments
4. However it is not the latest source code as per the original source
5. Pull the source code into an Android Studio environment and launch it Andriod Emulator

Workflow / Explanations

1. This is an Image Downloader App that uses the android.os.AsyncTask Framework to perform the downloading task that usually a long duration process.
2. The AsyncTask Framework requires 2 method implementations, namely doInBackground and onPostExecute.
3. The doInBackground usually does the heavy lifting work then the result will returned and in turns passed into onPostExecute
4. It is also important for the onPostExecute to call the finish() method that usually comes as a superclass method
5. During the processing in onPostExecute, developers are responsible for setting the Results which indicates the upstream activity status and the downstream Intent object
6. Assuming that developer uses the startActivityForResult method, then the Caller Activity is expected to have the onActivityResult method being called