The Android Game Developer's Handbook电子书

The Android Game Developer's Handbook

Table of Contents

The Android Game Developer's Handbook

Credits

About the Author

About the Reviewer

www.PacktPub.com

eBooks, discount offers, and more

Why subscribe?

Preface

What this book covers

What you need for this book

Who this book is for

Conventions

Reader feedback

Customer support

Errata

Piracy

Questions

1. Android Game Development

Android game development

Features and support

Challenges

User experience

Design constraints

A game is not just an application

Games versus applications

Life cycle of Android application and games

Performance of games and applications

Memory management of games and applications

Choosing the target device configuration

Game scale

Target audience

Feature requirement

Scope for portability

Best practices for making an Android game

Maintaining game quality

Minimalistic user interface

Supporting maximum resolutions

Supporting maximum devices

Background behavior

Interruption handling

Maintaining battery usage

Extended support for multiple visual quality

Introducing social networking and multiplayer

Summary

2. Introduction to Different Android Platforms

Exploring Android mobiles

Exploring Android tablets

Exploring Android televisions and STBs

Exploring Android consoles

Exploring Android watches

Development insights on Android mobiles

Development insights on Android tablets

Development insights on Android TV and STBs

UI and game design

Overscan

Development insights on Android consoles

Development insights on Android watches

Creating and setting up a wearable application

Including the correct libraries in the project

Hardware compatibility issues with Android versions

Platform-specific specialties

Android mobiles

Android tablets

Android televisions and STBs

Android consoles

Android watches

Summary

3. Different Android Development Tools

Android SDK

Android Development Tool

Android Virtual Device

Configuring AVD

Android Debug Bridge

Using adb on an Android device

Dalvik Debug Monitor Server

Other tools

Eclipse

Hierarchy Viewer

Draw 9-Patch

ProGuard

Asset optimization tools

Full asset optimization

Creating sprites

Tools for testing

Creating a test case

Setting up your test fixture

Adding test preconditions

Adding test methods to verify an activity

Performance profiling tools

Android Studio

Android project view

Memory and CPU monitor

Cross-platform tools

Cocos2d-x

Unity3D

Unreal Engine

PhoneGap

Corona

Titanium

Summary

4. Android Development Style and Standards in the Industry

The Android programming structure

Class formation

Call hierarchy

Game programming specifications

Gameplay programming

Graphics programming

Technical programming

Sound programming

Network programming

Game tool programming

Research and development programming

Technical design standards

Game analysis

Design pattern and flow diagram

Technical specification

Tools and other requirements

Resource analysis

Testing requirements

Scope analysis

Risk analysis

Change log

Game design standards

Game overview

Gameplay details

Game progression

Storyboard and game elements

Level design

Artificial intelligence

Art style

Technical reference

Change log

Other styles and standards

Different styles for different development engines

Different programming languages

Different work principles

Different target platforms

Industry best practices

Design standards

Programming standards

Testing standards

Summary

5. Understanding the Game Loop and Frame Rate

Introduction to the game loop

User input

Game update

State update

Rendering frames

Creating a sample game loop using the Android SDK

Game life cycle

Game update and user interface

Interrupt handling

General idea of a game state machine

The FPS system

Hardware dependency

Display or rendering

Memory load/unload operations

Heap memory

Stack memory

Register memory

ROM

Logical operations

Balance between performance and memory

Controlling FPS

Summary

6. Improving Performance of 2D/3D Games

2D game development constraints

2D art assets

Sets of 2D art assets

Same asset set for multiple resolutions

Number of assets drawn on screen

Use of font files

Sprite font

Bitmap font

TrueType font

2D rendering system

2D mapping

2D physics

Box2D

LiquidFun

Performance impact on games

2D collision detection

Rectangle collision

Rectangle and circle collision

Circle and circle collision

Performance comparison

3D game development constraints

Vertices and triangles

3D transformation matrix

3D object and polygon count

3D rendering system

3D mesh

Materials, shaders, and textures

Textures

Shaders

Materials

Collision detection

Primitive colliders

Mesh colliders

Ray casting

Concept of "world"

Elements of the game world

Light sources in the game world

Cameras in the game world

The rendering pipeline in Android

The 2D rendering pipeline

The 3D rendering pipeline

Optimizing 2D assets

Size optimization

Data optimization

Process optimization

Optimizing 3D assets

Limiting the polygon count

Model optimization

Common game development mistakes

Use of non-optimized images

Use of full utility third-party libraries

Use of unmanaged networking connections

Using substandard programming

Taking a shortcut

2D/3D performance comparison

Different look and feel

3D processing is way heavier than 2D processing

Device configuration

Processor

RAM

GPU

Display quality

Battery capacity

Summary

7. Working with Shaders

Introduction to shaders

What is a shader?

Necessity of shaders

Scope of shaders

How shaders work

Types of shaders

Pixel shaders

Vertex shaders

Geometry shaders

Tessellation shaders

Android library shaders

Writing custom shaders

Shaders through OpenGL

Use of shaders in games

Shaders in a 2D game space

Shaders in a 3D game space

Summary

8. Performance and Memory Optimization

Fields of optimization in Android games

Resource optimization

Art optimization

Sound optimization

Data file optimization

Design optimization

Game design optimization

Technical design optimization

Memory optimization

Don't create unnecessary objects during runtime

Use primitive data types as far as possible

Don't use unmanaged static objects

Don't create unnecessary classes or interfaces

Use the minimum possible abstraction

Keep a check on services

Optimize bitmaps

Release unnecessary memory blocks

Use external tools such as zipalign and ProGuard

Performance optimization

Using minimum objects possible per task

Using minimum floating points

Using fewer abstraction layers

Using enhanced loops wherever possible

Avoid getter/setters of variables for internal use

Use static final for constants

Using minimum possible inner classes

Relationship between performance and memory management

Memory management in Android

Shared application memory

Memory allocation and deallocation

Application memory distribution

Processing segments in Android

Application priority

Active process

Visible process

Active services

Background process

Void process

Application services

Service life cycle

Resource processing

Drawable resources

Layout resources

Color resources

Menu resources

Tween animation resources

Other resources

Different memory segments

Stack memory

Heap memory

Register memory

Importance of memory optimization

Optimizing overall performance

Choosing the base resolution

Defining the portability range

Program structure

Managing the database

Managing the network connection

Increasing the frame rate

Importance of performance optimization

Common optimization mistakes

Programming mistakes

Design mistakes

Wrong game data structure

Using game services incorrectly

Best optimization practices

Design constraints

Development optimization

Data structure model

Asset-using techniques

Art assets

Audio assets

Other assets

Handling cache data

Summary

9. Testing Code and Debugging

Android AVDs

Name of the AVD

AVD resolution

AVD display size

Android version API level

Android target version

CPU architecture

RAM amount

Hardware input options

Other options

Extended AVD settings

Android DDMS

Connecting an Android device filesystem

Profiling methods

Thread information monitoring

Heap information monitoring

Tracking memory allocation

Monitoring and managing network traffic

Tracking log information using Logcat

Emulating device operations

Android device testing and debugging

Device testing

Prototype testing

Full or complete testing

Regression testing

Release testing or run testing

Device debugging

Use of breakpoints

Monitoring the memory footprint

Checking log messages

Dalvik message log

ART message log

Checking heap updates

Tracking memory allocation

Checking overall memory usage

Private RAM

Proportional set size (PSS)

Tracking memory leaks

Strategic placement of different debug statements

Memory allocation

Tracking the object state at runtime

Checking the program flow

Tracking object values

Exception handling in Android games

Syntax

Scope

Null pointer exceptions

Index out of bound exceptions

Arithmetic exceptions

Input/output exceptions

Network exceptions

Custom exceptions

Debugging for Android while working with cross-platform engines

Best testing practices

Tools and APIs

Testing techniques

Local test

Instrumented test

Summary

10. Scope for Android in VR Games

Understanding VR

Evolution of VR

Modern VR systems

Use of VR

Video games

Education and learning

Architectural design

Fine arts

Urban design

Motion pictures

Medical therapy

VR in Android games

History of Android VR games

Technical specifications

Current Android VR game industry

Future of Android in VR

Google Daydream

Game development for VR devices

VR game design

VR target audience

VR game development constraints

Introduction to the Cardboard SDK

Cardboard headset components

Cardboard application working principle

Upgrades and variations

Basic guide to develop games with the Cardboard SDK

Launching and exiting the VR game

Hitting the Back button

Hitting the Home button

VR device adaptation

Display properties

In-game components

Game controls

Control concepts

Types of controls

Fuse button

Visual countdown

Fuse button indication

Control placement

VR game development through Google VR

Google VR using the Android SDK

Google VR using Android NDK

Android VR development best practices

Draw call limitations

Triangle count limitations

Keeping a steady FPS

Overcoming overheating problems

Better audio experience

Setting up proper project settings

Using a proper test environment

Challenges with the Android VR game market

Low target audience

Limited game genres

Long game sessions

Limited device support

Real-time constraints

Expanded VR gaming concepts and development

Summary

11. Android Game Development Using C++ and OpenGL

Introduction to the Android NDK

How the NDK works

Native shared library

Native static library

Build dependency

Android SDK

C++ compiler

Python

Gradle

Cygwin

Java

Native project build configuration

Android.mk configuration

Application.mk configuration

C++ for games – pros and cons

Advantages of using C++

Universal game programming language

Cross-platform portability

Faster execution

CPU architecture support

Disadvantages of using C++

High program complexity

Platform-dependent compiler

Manual memory management

Conclusion

Native code performance

Rendering using OpenGL

OpenGL versions

OpenGL 1.x

OpenGL 2.0

OpenGL 3.0

OpenGL 3.1

Detecting and setting the OpenGL version

Texture compression and OpenGL

ATC

PVRTC

DXTC

OpenGL manifest configuration

Choosing the target OpenGL ES version

Performance

Texture support

Device support

Rendering feature

Programming comfort

Different CPU architecture support

Available CPU architectures

ARM

x86

Neon

MIPS

Advantages and disadvantages of integrating multiple architecture support

Summary

12. Polishing Android Games

Requirements for polishing

Development polishing

Memory optimization

Performance optimization

Portability

Art polishing

UI polishing

Animation polishing

Marketing graphics

Design polishing

Designing UX

Polishing the game flow

Polishing the metagame

Game economy balance

Game difficulty balance

Play testing

User gameplay difficulty levels

User actions during gameplay

User actions while browsing the game

Whether the user is paying or not

Whether the game is running smoothly

Whether the user can adopt the gameplay

User retention

Taking care of the UX

Visual effects

Sound effects

Theme music

SFXs

Transaction effects

Action feedback

Android-specific polishing

Optimum use of hardware buttons

Sticking to basic Android features and functionalities

Longer background running

Following Google guidelines for Play Store efficiency

Game portability

Support for various screen sizes

Support for multiple resolutions

Support for multiple hardware configurations

Summary

13. Third-Party Integration, Monetization, and Services

Google Play Services

Google Analytics

Significance

Integration tips

Best utilization

Google IAB

The Google IAB model

Consumable items

Non-consumable items

Subscriptions

Integrating Google IAB

Advantages and disadvantages of Google IAB

Google Leaderboard

Significance

Integrating Google Leaderboard

Variety of leaderboards

Social Leaderboard

Public Leaderboard

Options for storing and displaying leaderboards

Push notifications

Database

Server

Target device

GCM service

Workflow of the push notification system using GCM

Integrating push notifications

Application integration

GCM setup

Server setup

Significance of push notifications

User retention

User control

Knowing user behavior

Alternative communication channel

Multiplayer implementation

Real-time multiplayer

Turn-based multiplayer

Single-screen real-time multiplayer

Pass and play turn-based multiplayer

Local network multiplayer

Analytic tools

Requirement of analytics tools

User behavior

Game crash reports

Game event triggers

Gameplay session timing

Gameplay frequency

Game balancing

User retention

Piracy prevention

Monetization aspects of analytic tools

Identify popular regions of the game

Identify a user's likes and dislikes

Validate and improve the metagame

Track paying users

Track and count advertisement display

Some useful analytic tools

Flurry

GameAnalytics

Crashlytics

AppsFlyer

Apsalar

Mixpanel

Localytics

Appcelerator

Android in-app purchase integration

What are in-app purchases?

In-app purchase options

Store billing services

Amazon billing services

ResponseReceiver

PurchasingService

PurchasingListener

Career billing services

Types of in-app purchases

Consumable items

Non-consumable items

Subscriptions

Android in-game advertisements

Requirement for advertisements

Terminologies in advertisement monetization

eCPM

CPC/CPA

CPI

RPM

Fillrate

Types of advertisements

Banner advertisements

Interstitial advertisements

Integration best practice

Video advertisements

Full length ads

Short length ads

In-game dynamic advertisements

Monetization techniques

Premium model

Free model

Freemium model

Try-and-buy model

Planning game revenue

Revenue versus profit

Revenue sources

Advertisement revenue

In-app purchase revenue

Other revenue sources

Regional variations of revenue plan

User base variations

User behavior variations

User acquisition techniques

Game promotion channels

YouTube channels

Android forums

Sports forums

Facebook promotion

Twitter and other social platforms

Game blogs and forum discussions

Paid user acquisition

Other techniques

User retention techniques

Daily bonus

Leaderboards and achievements

Offerwall Integration

Push notifications

Frequent updates

Featuring Android games

Creativity and uniqueness

User reviews and ratings

Download count

Revenue amount

Publishing Android games

Self publishing

Publishing through publishers

Summary

Index