eclipse中修改工程的Android版本

项目根目录下project.properties的记录项目中所需要的环境信息，比如Android的版本等

project.properties示例如下:

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1. # This file is automatically generated by Android Tools. 
2. # Do not modify this file -- YOUR CHANGES WILL BE ERASED! 
3. # 
4. # This file must be checked in Version Control Systems. 
5. # 
6. # To customize properties used by the Ant build system edit 
7. # "ant.properties", and override values to adapt the script to your 
8. # project structure. 
9. # 
10. # To enable ProGuard to shrink and obfuscate your code, uncomment this (available properties: sdk.dir, user.home): 
11. #proguard.config=${sdk.dir}/tools/proguard/proguard-android.txt:proguard-project.txt 
12. # Project target. 
13. target=android-17 

将target=android-xx改为需要的版本即可