我的Android库存在问题。
我想使用库org.apache.commons.codec.binary.Hex（版本1.6）中的Hex.encodeHexString（字节数组）方法
在我的Android平台（SDK 2.3.1）上，commons-codec库版本1.3已经存在但该方法在此版本中尚不存在（只有encodeHex（））。
我将版本1.6的jar库添加到我的Eclipse项目中（到/ libs目录中）但是当我在Emulator上运行项目时，我得到了这个：
E/AndroidRuntime(1632): FATAL EXCEPTION: main
E/AndroidRuntime(1632): java.lang.NoSuchMethodError: org.apache.commons.codec.binary.Hex.encodeHexString
如何指出操作系统在哪里是好库？
我在Mac OS X上使用Eclipse Juno和Java 1.6.0
抱歉我的英文不好，并提前致谢！
编辑：用jarjar工具显然可以解决我的问题。 http://code.google.com/p/google-http-java-client/issues/detail?id=75有人可以帮我使用这个工具吗？我不知道如何创建Ant Manifest或jar文件。
由于
答案 0 :(得分：9)
迟到的回复，但也许对某人有用。
解决了问题此插件允许在编译时重命名冲突库的包名称。
用法：
<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>
答案 1 :(得分：2)
nbe_42答案的扩展版本，包含完整的文档...
commons-codec-shaded jar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Android includes an outdated version (v1.3) of commons-codec as an internal library.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>
在你想使用阴影库的（apk / apklib / aar / jar）项目中：
<!-- ... -->
<dependency>
<groupId>commons-codec</groupId>
<artifactId>commons-codec-shaded</artifactId>
<version>1.9</version>
</dependency>
<!-- ... -->
答案 2 :(得分：1)
这是由于与Android一起打包的旧版（1.2）版本的Commons Codec导致的命名空间冲突与新版本相冲突。虽然着色是一个很好的解决方法，但从长远来看，我认为它不是一个可持续的解决方案。这是一个系统性问题，任何打包在Android中的开源库都可能出现这种问题。我已向Google提交了一个问题。如果您同意，我鼓励您明星＆＃34;这样它就能得到它所需要的关注。这是链接 - https://code.google.com/p/android/issues/detail?id=160578
答案 3 :(得分：0)
您是否已将库添加到项目的构建路径中？完成后，您应该可以从jar文件中调用该方法。
如果它在不添加库的情况下构建正常，那么你可能正在构建一个较新版本的android然后有效地部署到较旧的版本，我发现String.isEmpty()不在2.1中的困难方式但是当我正在编写它构建的代码，因为我正在构建4.1
您可能需要将jar导出到您的项目中（同样，您可以在配置构建路径时执行此操作）。
希望这有帮助
答案 4 :(得分：0)
关于nbe_42的maven shade插件，插件块放在pom.xml文件中非常重要，否则maven会错过它。
对我有用的是将它放在pom.xml中<build> <plugins>块的末尾：
<build>
<plugins>
{all other plugins}
...
{shade plugin}
</plugins>
</build>
最初我在街区的开头就有了它，而且maven没有运行它。
要创建.jar文件，请从apache.org下载commons-codec-1.8-src.zip源.zip文件。打开包装。 pom.xml文件将位于归档的基本目录中。如上所述，在pom.xml文件中插入nbe_42的插件块并运行：
mvn install
这将为您构建，测试，替换和安装插件。
成功后的输出应如下所示：
[INFO] --- maven-shade-plugin:2.2:shade (default) @ commons-codec ---
[INFO] Replacing original artifact with shaded artifact.
...
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
...`