Lab to demonstrate building blocks and Intents

Instructions for Inclass Lab 02:

This lab will have you creating a button that will navigate you to another activity with the choice of two images to set the background of your first activity.

This lab will introduce some basic features of calling an Intent to switch activities, perform an action on the sub Activity, and return a result back to the first Activity. Use of the values resource files will also be demonstrated.

• Open Android Studio and create a basic project. Name the project whatever you like, IntentDemo is a good candidate. Choose API 23: Android 6.0 (Marshmallow). Next choose just an Empty Activity.
• Place the two (2) images from Github into your drawable folder.
• Create a Button at the bottom of activity_main.xml. Name the button "Set Background" (Be sure to use strings.xml)
• Create another Activity class and associated layout. Name them whatever you would like.
• In second layout file, create two (2) ImageView widgets. You can use whatever Layout you desire, but ContstraintLayout works just fine.
• Link each ImageView with one of the images as shown in the screenshot.png and position/size the ImageView widgets.

• Add a reference to your second Activity in the AndroidManifest file.
• In your main Activity, create a public static final int that will represent your request code.
• Inside an onClick() for your button launch the second Activity. You will need to create an Intent and call startActivityForResult(). Pass in the intent you created and the request code.
• In your main Activity, you will need to @Override protected void onActivityResult(int requestCode, int resultCode, Intent data) and inside that block, grab the Layout like you would any other View item and call setBackground(getDrawable(imageID))
• After you have code running on a device properly, refactor "hard coded" strings to be read from res/values/strings.xml
• Share, commit, and push lab to your GitHub account