Manipulating bitmaps
Quite often, however, we need to draw bitmaps in a rotated or otherwise-altered state. It would be quite easy to use Photoshop or whatever your favorite image editing software happens to be to create more bitmaps from the original bitmap to face in other directions. Then, when we come to draw our bitmap, we can simply decide which way to face and draw the appropriate pre-loaded bitmap.
However, I thought it would be much more interesting and instructive if we worked with just one single source image and learned about the class that Android provides to manipulate images in our Java code. You will then be able to add rotating and inverting graphics to your app developer's toolkit.
What is a bitmap exactly?
A bitmap is called a bitmap because that is exactly what it is: a map of bits. While there are many bitmap formats that use different ranges and values to represent colors and transparency, they all amount to the same thing. They are a grid/map of...