Dalvik Virtual Machine (good on limited hardware)
Duplicate data used in class files is included only once in the .dex output, which saves space and uses less overhead.
The executable files can be modified again when you install an application to make things even more optimized for mobile. Things like byte order swapping and linking data structure and function libraries inline make the files smaller and run better on our devices.
The Dalvik VM was written from square one with Android in mind.
It‘s register-based.
It‘s designed for the limited memory.
.dex file‘s size is small.
Powered by a battery (so has battery constraint)
Platform security are protected by process bound.
Advice on programming on android:
1. When you are waiting for input, sleep.
2. Looping. From good to bad:
原文：http://www.cnblogs.com/HenryThinker/p/4054369.html