Android 平台的开发策略
鍾文昌 (Mask)
时间： (50min)
地點：北京．2012移动开发者大会
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License Announcement
• All reference data followed by its original
license
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XScale
2006
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Agenda
• Android平台的开发策略
• Hacking for Fun
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Agenda
• Android平台的开发策略
• Hacking for Fun
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Android架构
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Slides from "Android Anatomy and Physiology“, Patrick Brady ©
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Android架构概观
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Application
Middleware
Kernel
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Linux Architecture
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Android Architecture
!
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Code Flow
!
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Android架构剖析
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Android架构剖析
硬件平台
库函数
应用开发
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硬件平台
硬件平台
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库函數
!
库函数
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应用开发
!
应用开发
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手机制造商的开发策
略
• Google的態度
• 市场
• 技术
• 升級更新
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手机制造商
• 品牌商
• 代工
• 山寨
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获利机会
• 零组件
• 纯软件开发
• 软件＋硬件
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未来的明星产业
• 行动医疗
• 智能家庭
• 智能车载
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讨论议题
• 多核心
• 安全性
• 硬件加速
• 省电
• HTML5
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中国程序员
• 浮躁
• Free your mind
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技术重点
• 软硬整合
• 云与端
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Agenda
• Android平台的開發策略
• Hacking for Fun
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Just for Fun
Free Your Mind & Crazy Hacking
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I know nothing for Android
How do I hack ?
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Thinking...
The incredible hacking always
from the thinking...
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How ARM Works
• arm-none-linux-gnueabi-gcc -S
• more
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How JNI Works
• ...
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What Do I Want
• Reverse(disassemble) .apk
• Code modification/injection
• Re-pack(assemble) to .apk
• Execute .apk
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应用开发
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Java
resource
xml
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Android Application
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Java
resource
xml
.apk
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Android Project
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Building & Running
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Sign
ZipAlign
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• 補一張level 1
• uninstall
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Tools
• apktool
•
apktool/
• smali / baksmali (assemble/disassemble)
•
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Dalvik Opcodes
• nop
• move vx,vy
• return vx
• const vx, lit32
• filled-new-array {parameters},type_id
• iget vx, vy, field_id
• iput vx,vy, field_id
• invoke-virtual { parameters }, methodtocall
• invoke-direct { parameters }, methodtocall
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reverse
re-pack
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• Dalvik registers operated as local variables
• Each method has a fresh set of registers
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Puts the 4 bit constant into v3
Move the object reference in v26 to v0
Invokes interface method using
parameters in v0,v2,v3Move the return value of a previous method invocation into p4
Instantiates an object and
puts its reference into v2
Moves p4 into v1
Invoke the constructor of LevleManager
Puts the object reference in v2 into LevelManager:mLevelManager. The
LevelManager instance is referenced by v0
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Before After
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Before
After
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Reference
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Q & A
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