android中生成和使用jar

  参考资料1： http://blogold.chinaunix.net/u/9577/showart_1826330.html

    
Export Library
Prepare source code
Create an Android project
Create source code, and fix all bug
Remove res/*
Remove unused source files

Edit AndroidManifest.xml to remove the statements that referes to resource, such as android:icon="@drwable/icon", android:label="@string/app_name"

Export library
On Package Explorer Panel of Eclipse, right-click the project, and select Export
Select Jave -> JAR file, then press "Next". At this time a dialog pops up.

On the right panel of "Select the resources to export:" group, unselect all items (such as .classpath, .project, AndroidManifest.xlm, default.properties), then press "Next"
Press "Next"
Press "Finish"

Then the library is created. 

(Reference: Eclipse export jar files http://hi.baidu.com/etrigger/blog/item/e1fed134468b2fb2d0a2d3ad.html)
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Import Library

You can use a third party JAR in your application by adding it to your Eclipse project as follows: 
In the Package Explorer panel, right-click on your project and select Properties.
Select Java Build Path, then the tab Libraries.
Press the Add External JARs... button and select the JAR file

Alternatively, if you want to include third party JARs with your package, create a new directory for them within your project and select Add Library... instead.

It is not necessary to put external JARs in the assets folder. 

(Reference: http://code.google.com/intl/zh-CN/android/kb/commontasks.html) xxx

   通过上面的方法能够生成jar，使用的时候compile也能成功，但是运行的时候会出错，原因是需要用到的jar没有打包到apk里面。要把jar打包到apk里面还需要下面的步骤。

   参考资料2：http://topic.csdn.net/u/20091118/16/5a27d8e7-d8a2-43b3-92db-9d88ff8f7bec.html

   

1、在Android项目根目录下新建一个libs文件夹；

2、把你需要的导入的第三方Jar包复制进这个目录；

3、在libs目录上点右键，选Bulid path –> Use as source folder。