1，有什么用

apktool可以解开apk,得到smail代码和资源文件；反过来，也可以将smail代码和资源文件打包成为apk

2，环境配置

1,安装java并且设置java环境变量

2,下载apktool.jar

3，解开APK

G:\XXHD\lyq\apktool>java -jar apktool.jar d AdvDemo.apk -f

命令解释

1，apktool.jar文件和AdvDemo.apk文件都放在G:\XXHD\lyq\apktool文件夹下面；

2，java -jar apktool.jar就是调用apktool.jar来工作(它会自己找到main函数执行);

3, 参数d表示解压(比如-d AdvDemo.apk就表示要解压AdvDemo.apk；也可以解压XX.jar包)

4，默认解压到AdvDemo文件夹下面；

5，-f的意思是说如果文件夹存在(G:\XXHD\lyq\apktool\AdvDemo)，那就会覆盖掉；

4，报错

1,Exception in thread “main” java.lang.NullPointerException怎么办

G:\XXHD\lyq\apktool>java -jar apktool.jar d G:\XXHD\lyq\apktool\AdvDemo.apk

I: Using Apktool 2.0.0-RC4 on AdvDemo.apk

I: Loading resource table...

I: Decoding AndroidManifest.xml with resources...

I: Loading resource table from file: C:\Users\Administrator\apktool\framework\1.apk

W: Could not decode attr value, using undecoded value instead: ns=android, name=versionCode, value=0x00000001

I: Loading resource table from file: C:\Users\Administrator\apktool\framework\1.apk

W: Could not decode attr value, using undecoded value instead: ns=android, name=versionName, value=0x00000014

I: Loading resource table from file: C:\Users\Administrator\apktool\framework\1.apk

W: Could not decode attr value, using undecoded value instead: ns=android, name=versionCode, value=0x00000001

I: Loading resource table from file: C:\Users\Administrator\apktool\framework\1.apk

W: Could not decode attr value, using undecoded value instead: ns=android, name=versionName, value=0x00000014

Exception in thread "main" java.lang.NullPointerException

at java.io.Writer.write(Unknown Source)

at brut.androlib.res.util.ExtMXSerializer.writeAttributeValue(ExtMXSerializer.java:38)

at org.xmlpull.mxp1_serializer.MXSerializer.attribute(MXSerializer.java:673)

at org.xmlpull.v1.wrapper.classic.XmlSerializerDelegate.attribute(XmlSerializerDelegate.java:106)

at org.xmlpull.v1.wrapper.classic.StaticXmlSerializerWrapper.writeStartTag(StaticXmlSerializerWrapper.java:267)

at org.xmlpull.v1.wrapper.classic.StaticXmlSerializerWrapper.event(StaticXmlSerializerWrapper.java:211)

at brut.androlib.res.decoder.XmlPullStreamDecoder$1.event(XmlPullStreamDecoder.java:83)

at brut.androlib.res.decoder.XmlPullStreamDecoder.decode(XmlPullStreamDecoder.java:141)

at brut.androlib.res.decoder.XmlPullStreamDecoder.decodeManifest(XmlPullStreamDecoder.java:153)

at brut.androlib.res.decoder.ResFileDecoder.decodeManifest(ResFileDecoder.java:134)

at brut.androlib.res.AndrolibResources.decodeManifestWithResources(AndrolibResources.java:294)

at brut.androlib.Androlib.decodeManifestWithResources(Androlib.java:138)

at brut.androlib.ApkDecoder.decode(ApkDecoder.java:102)

at brut.apktool.Main.cmdDecode(Main.java:165)

at brut.apktool.Main.main(Main.java:81)

看这句C:\Users\Administrator\apktool\framework\1.apk

删除C:\Users\Administrator\apktool\framework\1.apk文件

5,打包

java -jar apktool.jar b SDKlro -f test.apk