Canvas demo app

We will create a new project just to explore the topic of drawing with Canvas. We will reuse what we have just learned and this time, we will also draw to the Bitmap instance.

Creating a new project

Create a new project and call it Canvas Demo. Choose the Empty Activity template.

In addition, we are going to be using the vanilla version of the Activity class and the MainActivity class will therefore extend Activity instead of AppCompatActivity as we have been using previously. This is simply because we no longer need the extra features provided by the AppCompatActivity class.

Note

The complete code for this app can be found in the download bundle in the Chapter 20/Canvas Demo folder.

Coding the Canvas demo app

To get started, edit the code in MainActivity.java, including adding the import directives and changing the version of the Activity class that the MainActivity class inherits from. Also notice in the next code that the call to the setContentView...