6. Cannon Game App
Objectives
In this chapter you’ll:
Create a simple game app that’s easy to code and fun to play.
Create a custom SurfaceView subclass for displaying the game’s graphics from a separate thread of execution.
Draw graphics using Paints and a Canvas.
Override View’s onTouchEvent method to fire a cannonball when the user touches the screen.
Perform simple collision detection.
Add sound to your app using a SoundPool and the AudioManager.
Override Fragment lifecycle methods onPause and onDestroy.
6.2 Test-Driving the Cannon Game app
6.3.1 Attaching a Custom View to a Layout
6.3.2 Using the Resource Folder raw
6.3.3 Activity and Fragment Lifecycle Methods
6.3.4 Overriding View Method onTouchEvent
6.3.5 Adding Sound with SoundPool and AudioManager
6.3.6 Frame-by-Frame Animation with Threads, SurfaceView and SurfaceHolder
6.3.7 Simple Collision Detection
6.3.8 Drawing Graphics Using Paint and Canvas
6.4 Building the App’s GUI and Resource Files
6.4.5 Adding the Sounds to the App
6.5 Class Line Maintains a Line’s Endpoints
6.6 MainActivity Subclass of Activity
6.7 CannonGameFragment Subclass of Fragment
6.8 CannonView Subclass of View
6.8.1 package and import Statements
6.8.2 Instance Variables and Constants
6.8.4 Overriding View Method onSizeChanged
6.8.10 Method showGameOverDialog
6.8.11 Methods stopGame and releaseResources
6.8.12 Implementing the SurfaceHolder.Callback Methods
6.8.13 Overriding View Method onTouchEvent
6.8.14 CannonThread: Using a Thread to Create a Game Loop
Self-Review Exercises | Answers to Self-Review Exercises | Exercises