我有与Android库的问题。
我想用从库org.apache.commons.codec.binary.Hex方法Hex.encodeHexString（字节数组）（1.6版）
在我的Android平台（SDK 2.3.1），公地编解码器库1.3版已经存在，但该方法不能在这个版本还不存在（仅encodeHex（））。
我加入的1.6版本的jar库到我的Eclipse项目（进入/ libs目录），但是当我运行模拟器的项目中，我得到这样的：
E/AndroidRuntime(1632): FATAL EXCEPTION: main
E/AndroidRuntime(1632): java.lang.NoSuchMethodError: org.apache.commons.codec.binary.Hex.encodeHexString
我怎么能指示OS哪里是好的图书馆？
我在Mac OS X使用Eclipse的Juno与Java 1.6.0
对不起，事先我的英语不好，并感谢！
编辑：我的问题可能与jarjar工具显然解决。 http://code.google.com/p/google-http-java-client/issues/detail?id=75
有人可以帮助我这个工具？ 我不知道如何创建一个Ant清单或jar文件。
谢谢
晚答复，但也许有用的人。
问题通过使用解决的Maven插件阴影
这个插件允许在编译重命名冲突库的包名。
使用方法：
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-shade-plugin</artifactId>
<executions>
<execution>
<phase>package</phase>
<goals>
<goal>shade</goal>
</goals>
<configuration>
<relocations>
<relocation>
<pattern>org.apache.commons</pattern>
<shadedPattern>com.example.shaded.org.apache.commons</shadedPattern>
</relocation>
</relocations>
<promoteTransitiveDependencies>true</promoteTransitiveDependencies>
</configuration>
</execution>
</executions>
</plugin>
nbe_42的答案的扩展版本，具有完整的文档...
公地编解码器阴影罐子项目：
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>commons-codec</groupId>
<artifactId>commons-codec-shaded</artifactId>
<name>Apache Commons Codec (shaded)</name>
<!-- The version of this project specifies the Apache Commons Codec version which will
be used, it must therefore match an existing (and preferably current) version. -->
<version>1.9</version>
<packaging>jar</packaging>
<!--
*************************************************************
Rationale for this "shaded" version of Apache Commons Codec
*************************************************************
Context:
Android includes an outdated version (v1.3) of commons-codec as an internal library.
This library is not exposed in the Android SDK so app developers who want to rely on
commons-codec need to treat it as an addition dependency and include it in the APK
of their app. However, at runtime Android will always favour its internal version of
the library which causes trouble when app code tries to call methods that don't
exist in v1.3 but do exist in the version the developer expected to be using.
Solution:
After experimenting with many different variations the current (and final) solution
to this problem is implemented in this project and does not require big hacks or
changes in projects which depend on commons-codec, expect for declaring dependency
on commons-codec-shaded (i.e. this project) instead of the original commons-codec.
What we do here is take the "original" commons-codec library (currently version 1.9)
and use the maven-shade-plugin to "shade" it, which means we modify the package name
of the library (both in the compiled classes and the sources jar) in order to avoid
the clash with Android's version. The package name is changes from
"org.apache.commons.codec" to "shaded.org.apache.commons.codec". The result is
published to the local Maven repository for other projects to use by simple
dependency declaration on this project. Because we only apply the shading to
commons-codec itself (and not to other classes using it; which is possible using the
shade plug-in but doesn't work in combination with android-maven-plugin) any client
classes which make use of commons-codec will have to import the new "shaded" package
name instead of the old one.
Issue on android-maven-plugin github which I posted to discuss all this:
https://github.com/jayway/maven-android-plugin/issues/487
-->
<description>
The Apache Commons Codec package contains simple encoder and decoders for
various formats such as Base64 and Hexadecimal. In addition to these
widely used encoders and decoders, the codec package also maintains a
collection of phonetic encoding utilities.
</description>
<url>http://commons.apache.org/proper/commons-codec/</url>
<organization>
<name>The Apache Software Foundation</name>
<url>http://www.apache.org/</url>
</organization>
<licenses>
<license>
<name>The Apache Software License, Version 2.0</name>
<url>http://www.apache.org/licenses/LICENSE-2.0.txt</url>
<distribution>repo</distribution>
</license>
</licenses>
<contributors>
<contributor>
<name>Matthias Stevens</name>
<email>m.stevens {at} ucl.ac.uk</email>
<roles>
<role>Shading for use on Android</role>
</roles>
</contributor>
<!-- see commons-codec:commons-codec pom for original contributors/developers -->
</contributors>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<maven.compiler.source>1.6</maven.compiler.source>
<maven.compiler.target>1.6</maven.compiler.target>
<commons-codec-package>org.apache.commons.codec</commons-codec-package>
<shading.prefix>shaded</shading.prefix>
<shaded-commons-codec-package>${shading.prefix}.${commons-codec-package}</shaded-commons-codec-package>
<commons-codec-src-folder>${project.build.directory}/commons-codec-src</commons-codec-src-folder>
<commons-codec-res-folder>${project.build.directory}/commons-codec-res</commons-codec-res-folder>
<manifest.path>${project.build.directory}/MANIFEST.MF</manifest.path>
<!-- plugin versions -->
<dependency-plugin-version>2.9</dependency-plugin-version>
<compiler-plugin-version>3.2</compiler-plugin-version>
<antrun-plugin-version>1.7</antrun-plugin-version>
<jar-plugin-version>2.5</jar-plugin-version>
<source-plugin-version>2.4</source-plugin-version>
<shade-plugin-version>2.3</shade-plugin-version>
<bundle-plugin-version>2.5.3</bundle-plugin-version>
<!-- taken/modified from: http://svn.apache.org/repos/asf/commons/proper/commons-parent/trunk/pom.xml -->
<commons.osgi.symbolicName>${shaded-commons-codec-package}</commons.osgi.symbolicName>
<commons.osgi.export>${shaded-commons-codec-package}.*;version=${project.version};-noimport:=true</commons.osgi.export>
<commons.osgi.import>*</commons.osgi.import>
<commons.osgi.dynamicImport />
<commons.osgi.private />
</properties>
<build>
<finalName>${project.artifactId}</finalName>
<sourceDirectory>${commons-codec-src-folder}</sourceDirectory>
<resources>
<resource>
<!-- txt files in shaded\org\apache\commons\codec\language\bm -->
<directory>${commons-codec-res-folder}</directory>
<includes>
<include>${shading.prefix}/**/*.txt</include>
</includes>
</resource>
<resource>
<!-- LICENSE & NOTICE files -->
<directory>${commons-codec-res-folder}/META-INF</directory>
<targetPath>META-INF</targetPath>
<includes>
<include>*.txt</include>
</includes>
</resource>
</resources>
<plugins>
<plugin>
<!-- fetch & unpack commons-codec sources and resources -->
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-dependency-plugin</artifactId>
<version>${dependency-plugin-version}</version>
<executions>
<execution>
<id>unpack_commons-codec_sources_and_resources</id>
<phase>process-sources</phase>
<goals>
<goal>unpack</goal>
</goals>
<configuration>
<artifactItems>
<!-- commons-codec sources -->
<artifactItem>
<groupId>commons-codec</groupId>
<artifactId>commons-codec</artifactId>
<!-- the project version specifies the commons-codec version to use: -->
<version>${project.version}</version>
<classifier>sources</classifier>
<overWrite>true</overWrite>
<excludes>**/*.txt,META-INF/*</excludes>
<outputDirectory>${commons-codec-src-folder}</outputDirectory>
</artifactItem>
<!-- commons-codec resources (in package) -->
<artifactItem>
<groupId>commons-codec</groupId>
<artifactId>commons-codec</artifactId>
<!-- the project version specifies the commons-codec version to use: -->
<version>${project.version}</version>
<classifier>sources</classifier>
<overWrite>true</overWrite>
<includes>org/**/*.txt</includes>
<!-- apply shading: -->
<outputDirectory>${commons-codec-res-folder}/${shading.prefix}</outputDirectory>
</artifactItem> -->
<!-- commons-codec resources (in META-INF) -->
<artifactItem>
<groupId>commons-codec</groupId>
<artifactId>commons-codec</artifactId>
<!-- the project version specifies the commons-codec version to use: -->
<version>${project.version}</version>
<classifier>sources</classifier>
<overWrite>true</overWrite>
<includes>META-INF/*.txt</includes>
<outputDirectory>${commons-codec-res-folder}</outputDirectory>
</artifactItem> -->
</artifactItems>
</configuration>
</execution>
</executions>
</plugin>
<plugin>
<!-- compile commons-codec sources -->
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>${compiler-plugin-version}</version>
<configuration>
<source>${maven.compiler.source}</source>
<target>${maven.compiler.target}</target>
<encoding>UTF-8</encoding>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-jar-plugin</artifactId>
<version>${jar-plugin-version}</version>
<executions>
<execution>
<!-- jar unshaded classes (& resources) -->
<id>jar-unshaded</id>
<phase>package</phase>
<goals>
<goal>jar</goal>
</goals>
</execution>
<execution>
<!-- rejar shaded classes (& resources), with proper manifest partially generated by bundle plugin -->
<id>jar-shaded</id>
<!-- runs after bundle plugin has done its work to generate bundle manifest -->
<phase>post-integration-test</phase>
<goals>
<goal>jar</goal>
</goals>
<configuration>
<archive>
<manifestFile>${manifest.path}</manifestFile>
<manifestEntries>
<Specification-Title>${project.name}</Specification-Title>
<Specification-Version>${project.version}</Specification-Version>
<Specification-Vendor>${project.organization.name}</Specification-Vendor>
<Implementation-Title>${project.name}</Implementation-Title>
<Implementation-Version>${project.version}</Implementation-Version>
<Implementation-Vendor>${project.organization.name}</Implementation-Vendor>
<Implementation-Vendor-Id>org.apache</Implementation-Vendor-Id>
<Implementation-Build>${implementation.build}</Implementation-Build>
<X-Compile-Source-JDK>${maven.compiler.source}</X-Compile-Source-JDK>
<X-Compile-Target-JDK>${maven.compiler.target}</X-Compile-Target-JDK>
</manifestEntries>
</archive>
</configuration>
</execution>
</executions>
</plugin>
<plugin>
<!-- attach sources jar -->
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-source-plugin</artifactId>
<version>${source-plugin-version}</version>
<configuration>
<archive>
<manifest>
<addDefaultImplementationEntries>true</addDefaultImplementationEntries>
<addDefaultSpecificationEntries>true</addDefaultSpecificationEntries>
</manifest>
</archive>
</configuration>
<executions>
<execution>
<!-- jar unshaded sources -->
<id>attach-unshaded-sources</id>
<!-- <phase>package</phase> (default) -->
<goals>
<goal>jar</goal>
</goals>
</execution>
<execution>
<!-- rejar shaded sources -->
<id>attach-shaded-sources</id>
<phase>post-integration-test</phase>
<goals>
<goal>jar</goal>
</goals>
</execution>
</executions>
</plugin>
<plugin>
<!-- apply the shading to main jar and sources jar -->
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-shade-plugin</artifactId>
<version>${shade-plugin-version}</version>
<executions>
<execution>
<id>shading-main-jar-and-sources-jar</id>
<phase>package</phase>
<goals>
<goal>shade</goal>
</goals>
<configuration>
<!-- (not needed as it is the one and only artifact/dependency)
<artifactSet>
<includes>
<include>commons-codec:*</include>
</includes>
</artifactSet>
-->
<relocations>
<relocation>
<pattern>${commons-codec-package}</pattern>
<shadedPattern>${shaded-commons-codec-package}</shadedPattern>
</relocation>
</relocations>
<createDependencyReducedPom>false</createDependencyReducedPom>
<!-- (only needed when dependency reduced pom is generated)
<dependencyReducedPomLocation>${project.build.directory}/dependency-reduced-pom.xml</dependencyReducedPomLocation>
<keepDependenciesWithProvidedScope>true</keepDependenciesWithProvidedScope>
<promoteTransitiveDependencies>true</promoteTransitiveDependencies>
-->
<createSourcesJar>true</createSourcesJar>
<shadeSourcesContent>true</shadeSourcesContent>
</configuration>
</execution>
</executions>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-antrun-plugin</artifactId>
<version>${antrun-plugin-version}</version>
<executions>
<execution>
<!-- unpack shaded classes & sources for manifest generation and re-jarring -->
<id>post-shading-tasks</id>
<phase>package</phase>
<goals>
<goal>run</goal>
</goals>
<configuration>
<target>
<!-- Unjar shaded classes for generation of manifest -->
<echo>Deleting unshaded classes...</echo>
<delete dir="${project.build.directory}/classes"/>
<echo>Unjarring shaded main jar...</echo>
<unzip src="${project.build.directory}/${project.artifactId}.jar" dest="${project.build.directory}/classes"/>
<!-- delete to prevent dual inclusion in new main jar -->
<delete dir="${project.build.directory}/classes/META-INF/maven"/>
<!-- Unjar shaded sources -->
<echo>Deleting unshaded sources...</echo>
<delete dir="${commons-codec-src-folder}"/>
<echo>Unjarring shaded sources jar...</echo>
<unzip src="${project.build.directory}/${project.artifactId}-sources.jar" dest="${commons-codec-src-folder}"/>
<!-- delete to prevent dual inclusion in new sources jar -->
<delete dir="${commons-codec-src-folder}/META-INF"/>
</target>
</configuration>
</execution>
<execution>
<id>delete-orginals</id>
<phase>verify</phase>
<goals>
<goal>run</goal>
</goals>
<configuration>
<target>
<echo>Deleting unshaded jar files...</echo>
<delete>
<fileset dir="${project.build.directory}" includes="**/original-*.jar" />
</delete>
</target>
</configuration>
</execution>
</executions>
</plugin>
<plugin>
<!-- taken/modified from: http://svn.apache.org/repos/asf/commons/proper/commons-parent/trunk/pom.xml -->
<groupId>org.apache.felix</groupId>
<artifactId>maven-bundle-plugin</artifactId>
<version>${bundle-plugin-version}</version>
<configuration>
<archive>
<forced>true</forced>
</archive>
<excludeDependencies>true</excludeDependencies>
<manifestLocation>${project.build.directory}</manifestLocation>
<instructions>
<!-- stops the "uses" clauses being added to "Export-Package" manifest entry -->
<_nouses>true</_nouses>
<!-- Stop the JAVA_1_n_HOME variables from being treated as headers by Bnd -->
<_removeheaders>JAVA_1_3_HOME,JAVA_1_4_HOME,JAVA_1_5_HOME,JAVA_1_6_HOME,JAVA_1_7_HOME,JAVA_1_8_HOME</_removeheaders>
<Bundle-SymbolicName>${commons.osgi.symbolicName}</Bundle-SymbolicName>
<Export-Package>${commons.osgi.export}</Export-Package>
<Private-Package>${commons.osgi.private}</Private-Package>
<Import-Package>${commons.osgi.import}</Import-Package>
<DynamicImport-Package>${commons.osgi.dynamicImport}</DynamicImport-Package>
<Bundle-DocURL>${project.url}</Bundle-DocURL>
</instructions>
</configuration>
<executions>
<execution>
<id>bundle-manifest</id>
<!-- runs after the unjarring of the shaded classes -->
<phase>integration-test</phase><!-- default is: process-classes -->
<goals>
<goal>manifest</goal>
</goals>
</execution>
</executions>
</plugin>
</plugins>
</build>
</project>
而在您要使用的阴影库（APK / apklib / AAR /罐）项目（S）：
<!-- ... -->
<dependency>
<groupId>commons-codec</groupId>
<artifactId>commons-codec-shaded</artifactId>
<version>1.9</version>
</dependency>
<!-- ... -->
这是由于从导致该来包装与Android与新版本相冲突的命名空间冲突和共享编解码器的旧的（1.2）版本。 虽然阴影是一个很好的解决办法，我不认为这是从长远来看，可持续的解决方案。 这是一个可以与被包装在任何Android的开源库出现一个系统性的问题。 我已经提交的问题给谷歌。 如果你同意，我鼓励你的“明星”，以便它得到它所需要的注意。 这里的链接- https://code.google.com/p/android/issues/detail?id=160578
已添加的库添加到项目的构建路径？ 当你这样做，你应该能够调用从jar文件的方法。
如果不添加库，那么你可以有效地防止建筑的Android的新版本，然后部署到一老一建立好了，我发现硬盘的方式， String.isEmpty()不是2.1，但是当我在写代码它建立OK，因为我是反对建设4.1
您可能需要的jar导出与您的项目（如重新配置构建路径，你可以做到这一点）。
希望这可以帮助
关于nbe_42的行家荫的插件，其中插件块放在pom.xml文件是非常重要或Maven会错过它。
什么工作对我来说是把它在结束<build> <plugins>在pom.xml中块：
<build>
<plugins>
{all other plugins}
...
{shade plugin}
</plugins>
</build>
我原本是在块的开始和Maven没有运行。
要创建.jar文件从apache.org下载commons-codec-1.8-src.zip源.zip文件。 解压。 pom.xml文件将在归档的基本目录。 如上文所述，并运行插入nbe_42的插件模块在pom.xml文件：
mvn install
这将构建，测试，更换和安装该插件为您服务。
成功输出应该是这个样子：
[INFO] --- maven-shade-plugin:2.2:shade (default) @ commons-codec ---
[INFO] Replacing original artifact with shaded artifact.
...
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
...`
