Android GameCIH2(CheatIng Hacker)
http://www.cih.com.tw/gamecih
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dalvikvm
http://www.dalvikvm.com/
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Bytecode for the Dalvik VM
http://netmite.com/android/mydroid/dalvik/docs/dalvik-bytecode.html
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smali（An assembler/disassembler for Android's dex format）
http://code.google.com/p/smali/