web service in Android

How to create an example web service in Android. For submission :

1. Describe the main steps in installing the Android SDK at https://android-doc.github.io/sdk/installing/index.html

2. Describe in short the packages you added from the procedure shown at https://android-doc.github.io/sdk/installing/adding-packages.html

3. Go to (‘Creating an Android Project’) https://android-doc.github.io/training/basics/firstapp/creating-project.html and describe main ideas in less than 2 pages from the steps given to build example app:

4. Take the snapshot of the running app you created under 3, and submit the snapshot.