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Beginning android games
- 1. Beginning Android Games Mario Zechner
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- 10. Who am I? @badlogicgames http://www.badlogicgames.com/
- 11. What I‘ll TalkAbout • Why Android? • What‘s in a game? • Android for game developers • Frameworks & engines
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- 15. Why Android? … orhow to not make an infographic …
- 16. Why Android? A GamingMachine For Everyone!
- 17. What‘s in aGame?
- 18. What‘s in aGame? DESIGN
- 19. What‘s in aGame?
- 20. What‘s in aGame?
- 21. What‘s in aGame?
- 22. What‘s in aGame?
- 23. What‘s in aGame?
- 24. What‘s in aGame?
- 25. What‘s in aGame? Technology
- 26. What‘s in aGame? • Window & Life-Cycle Management • File I/O • Input Devices • Audio • Graphics • Networking • Social Media Integration • Payment System • Tools • … you actually read all of this?
- 27. Android for GameDevelopers
- 28. Android for GameDevelopers + Tooling + Performance + API Access + Portability - Performance - Tooling - Portability - API Access
- 29. Android for GameDevelopers
- 30. Android for GameDevelopers
- 31. Android for GameDevelopers • Store files in – APK (read-only) – Internal Storage (read/write, limited space) – External Storage (read/write) • SharedPreferences for simple settings • GOTCHAS – APK size limit (50mb) – Asset file compression bug until Android 2.3 – No direct access via NDK in older Android versions
- 32. Android for GameDevelopers • OnTouchListener and OnKeyListener on View • SensorManager for compass, accelerometer, gyro, … • USB/NFC since Android 3+ • GOTCHAS – Horrible Touch API – Multi-touch broken on many devices
- 33. Android for GameDevelopers • SoundPool for sound effects • MediaPlayer for streaming music • OpenSL ES in C/C++ setVolumeControlStream(AudioManager.STREAM_MUSIC); soundPool = new SoundPool(20, AudioManager.STREAM_MUSIC, 0); • GOTCHAS explosionId = soundPool.load(descriptor, 1); soundPool.play(explosionId, 1, 1, 0, 0, 1); – High latency (+100ms) – Broken drivers mediaPlayer = new MediaPlayer() mediaPlayer.setDataSource(descriptor.getFileDescriptor(), descriptor.getStartOffset(), descriptor.getLength()); mediaPlayer.prepare(); mediaPlayer.setLooping(true); mediaPlayer.start()
- 34. Android for GameDevelopers Canvas OpenGL ES canvas.drawRGB(255, 255, 255); paint.setColor(Color.RED); canvas.drawLine(0, 0, canvas.getWidth()-1, canvas.getHeight()-1, paint); paint.setStyle(Style.STROKE); paint.setColor(0xff00ff00); canvas.drawCircle(canvas.getWidth()/2, canvas.getHeight()/2, 40, paint); paint.setStyle(Style.FILL); paint.setColor(0x770000ff); canvas.drawRect(100, 100, 200, 200, paint); + Ease-of-Use + Performance - Performance + 2D / 3D - 2D-only - Ease-of-Use
- 35. Android for GameDevelopers Canvas OpenGL ES canvas.drawRGB(255, 255, 255); paint.setColor(Color.RED); canvas.drawLine(0, 0, canvas.getWidth()-1, canvas.getHeight()-1, paint); paint.setStyle(Style.STROKE); paint.setColor(0xff00ff00); canvas.drawCircle(canvas.getWidth()/2, canvas.getHeight()/2, 40, paint); paint.setStyle(Style.FILL); paint.setColor(0x770000ff); canvas.drawRect(100, 100, 200, 200, paint); + Ease-of-Use + Performance - Performance + 2D / 3D - 2D-only - Ease-of-Use MY GOD, IT‘S FULL OF GOTCHAS
- 36. Android for GameDevelopers Canvas OpenGL ES canvas.drawRGB(255, 255, 255); paint.setColor(Color.RED); canvas.drawLine(0, 0, canvas.getWidth()-1, canvas.getHeight()-1, paint); paint.setStyle(Style.STROKE); paint.setColor(0xff00ff00); canvas.drawCircle(canvas.getWidth()/2, canvas.getHeight()/2, 40, paint); paint.setStyle(Style.FILL); paint.setColor(0x770000ff); canvas.drawRect(100, 100, 200, 200, paint); + Ease-of-Use + Performance - Performance + 2D / 3D - 2D-only - Ease-of-Use MY GOD, IT‘S FULL OF GOTCHAS
- 37. Android for GameDevelopers • Bugs in shader compilers • Deviations from OpenGL ES specification • Highly varying performance • GPU dependent optimizations • Texture compression formats • …
- 38. Android for GameDevelopers • And if you use Java … • Garbage Collector pauses (+200ms) • Varying maximum heap memory • Direct ByteBuffers and Bitmaps counted against Java heap • Method call overhead
- 39. Android for GameDevelopers • A lot better since 2.2, great since 4.0 • Concurrent GC • JIT • Tons of bug fixes • GOTCHA
- 40. Android for GameDevelopers
- 41. Android for GameDevelopers FRAGMENTATION
- 42. Android for GameDevelopers Screen Sizes, Aspect Ratios, Resolutions
- 43. Android for GameDevelopers • Pick target resolution/aspect ratio • Stretch or Clip on other aspect ratios • Ship multiple asset sizes • We‘ve done this on the PC, we can do it on Android!
- 44. Android for GameDevelopers
- 45. Android for GameDevelopers • Device-specific driver bugs (audio, OpenGL ES) • Android version-specific bugs • Multiple test devices (3-4) – PowerVR, Mali, Snapdragon, Tegra – Low-end to high-end phones – Tablet • Or use a framework/engine!
- 46. Frameworks & Engines Not exhaustive, visit http://mobilegameengines.com/
- 47. Frameworks & Engines $$$ Free $$$ Free $$$ Free Free $$$ Not exhaustive, visit http://mobilegameengines.com/
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- 49. • Java (lotsof C/C++ under the hood) • Develop on the desktop 90% of the time (no slow deploys, no emulator madness) • Abstraction layers – Low-level: OpenGL ES, file i/o, input, audio, ... – Mid-level: shaders, textures, linalg, … – High-level: fonts, sprites, scene graph, … • Pick and choose, see feature list http://libgdx.badlogicgames.com/features.html
- 51. Spine, 2D skeletalanimation editor https://plus.google.com/100248578810918104811
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- 53. Questions? @badlogicgames http://www.badlogicgames.com/