Beginning android games

Beginning Android Games Mario Zechner

Who am I?

Who am I? @badlogicgameshttp://www.badlogicgames.com/

What I‘ll Talk About• Why Android?• What‘s in a game?• Android for game developers• Frameworks & engines

Why Android?

Why Android?… or how to not make an infographic …

Why Android?A Gaming Machine For Everyone!

What‘s in a Game?

What‘s in a Game? DESIGN

What‘s in a Game?

What‘s in a Game?Technology

What‘s in a Game?• Window & Life-Cycle Management• File I/O• Input Devices• Audio• Graphics• Networking• Social Media Integration• Payment System• Tools• … you actually read all of this?

Android for Game Developers

Android for Game Developers + Tooling + Performance + API Access + Portability - Performance - Tooling - Portability - API Access

Android for Game Developers• 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

Android for Game Developers• 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

Android for Game Developers• 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()

Android for Game Developers Canvas OpenGL EScanvas.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

Android for Game Developers Canvas OpenGL EScanvas.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

Android for Game Developers• Bugs in shader compilers• Deviations from OpenGL ES specification• Highly varying performance• GPU dependent optimizations• Texture compression formats• …

Android for Game Developers• And if you use Java …• Garbage Collector pauses (+200ms)• Varying maximum heap memory• Direct ByteBuffers and Bitmaps counted against Java heap• Method call overhead

Android for Game Developers• A lot better since 2.2, great since 4.0• Concurrent GC• JIT• Tons of bug fixes• GOTCHA

Android for Game Developers FRAGMENTATION

Android for Game DevelopersScreen Sizes, Aspect Ratios, Resolutions

Android for Game Developers• 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!

Android for Game Developers• 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!

Frameworks & Engines Not exhaustive, visithttp://mobilegameengines.com/

Frameworks & Engines$$$Free$$$Free$$$FreeFree$$$ Not exhaustive, visit http://mobilegameengines.com/

• Java (lots of 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 listhttp://libgdx.badlogicgames.com/features.html

Spine, 2D skeletal animation editorhttps://plus.google.com/100248578810918104811

Source & Releaseshttp://libgdx.badlogicgames.com/download.htmlDocshttp://libgdx.badlogicgames.com/documentation.htmlForumhttp://badlogicgames.com/forum/Bloghttp://www.badlogicgames.comIRCirc.freenode.org, #libgdx

Questions? @badlogicgameshttp://www.badlogicgames.com/

Beginning android games

von Mario Zechner am 04. Oktober 2012

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