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Android

Posted by Akshay Shivpuri
Akshay Shivpuri
2,917 Points

Use multiple background images in Crystal Ball app

Helllo everyone,

I want to carry out a modification in CrystallBall app.

When the user shakes the phone, then every time a new background image should come rather than carrying out the animation in the background crystal image.

Actually the modification will work in such a way that each background image will be associated with a given text of string which we are storing in the array. Thus for "n" strings there will be "n" different images. Thus when a user shakes the phone then , the random string along with it's corresponding background image should appear

Looking forward to the reply Ben Jakuben

Thanks in advance.

2 Answers

Ben Jakuben
STAFF
Ben Jakuben
Treehouse Teacher
Ben Jakuben
Ben Jakuben
Treehouse Teacher

There are different ways you could tackle this, of course. At first, I would recommend using two separate arrays: one to hold the ID of the images you want to use, and one to hold the strings you want to use. You just need to match the correct image and String with the same index in the array.

There is the problem with this approach: it's fragile in that if anything gets changed in the array the whole order could get thrown off. But it's simple and straightforward and worth trying as an exercise.

After that, you would want to tie the image and String together somehow. One option is to use a HashMap like we do in the Blog Reader course. Another is to create a new simple custom object that holds an image ID and a String message.

Also, here's a good discussion on StackOverflow about what method you could use to set the background image dynamically of the ImageView.

Best of luck!

Akshay Shivpuri
Akshay Shivpuri
2,917 Points
Akshay Shivpuri
Akshay Shivpuri
2,917 Points

Thanks Ben for the quick reply.

I'll go through the Blog Reader app first and learn about HashMap from there. I'll then update you over my progress here.

Cheers, Akshay