android 代码proguard

大家都知道，java 代码很容易被反编译，同样android 也是如此，android中引入了proguard 代码混淆。下面就说下怎么样在android中加入代码混淆。

Note:开发环境是Mac 系统。采用maven 开发

在pom 中加入：

<pluginManagement><plugins><!--This plugin's configuration is used to store Eclipse m2e settings only. It has no influence on the Maven build itself. --><plugin><groupId>org.eclipse.m2e</groupId><artifactId>lifecycle-mapping</artifactId><version>1.0.0</version><configuration><lifecycleMappingMetadata><pluginExecutions><pluginExecution><pluginExecutionFilter><groupId>com.jayway.maven.plugins.android.generation2</groupId><artifactId>android-maven-plugin</artifactId><versionRange>[3.1.1,)</versionRange><goals><goal>package</goal><goal>proguard</goal><goal>update-version</goal></goals></pluginExecutionFilter><action><ignore></ignore></action></pluginExecution></pluginExecutions></lifecycleMappingMetadata></configuration></plugin><plugin><groupId>org.codehaus.mojo</groupId><artifactId>build-helper-maven-plugin</artifactId><configuration><artifacts><artifact><file>${project.build.directory}/${project.artifactId}-signed-aligned.apk</file><type>apk</type><classifier>signed-aligned</classifier></artifact><artifact><file>${project.build.directory}/proguard/mapping.txt</file><type>map</type><classifier>release</classifier></artifact></artifacts></configuration><executions><execution><id>attach-signed-aligned</id><phase>package</phase><goals><goal>attach-artifact</goal></goals></execution><execution>      <id>parse-version</id>      <goals>        <goal>parse-version</goal>      </goals>    </execution></executions></plugin><plugin><groupId>com.pyx4me</groupId><artifactId>proguard-maven-plugin</artifactId><version>2.0.4</version><executions><execution><phase>package</phase><goals><goal>proguard</goal></goals></execution></executions><configuration><obfuscate>true</obfuscate><options><option>@proguard.cfg</option></options><injar>${project.build.finalName}.jar</injar><outjar>${project.build.finalName}-small.jar</outjar><outputDirectory>${project.build.directory}</outputDirectory><libs><lib>${java.home}/lib/rt.jar</lib><lib>${java.home}/lib/jsse.jar</lib></libs><addMavenDescriptor>false</addMavenDescriptor></configuration></plugin></plugins></pluginManagement>        <plugins>...<plugin>        <groupId>com.pyx4me</groupId>        <artifactId>proguard-maven-plugin</artifactId>    </plugin>....        </plugins>

注意红色部分，代码混淆要用到rt.jar 和jsse.jar 这两个jar包。但在mac 中没有这个rt.jar . 运行时候回报错，说没有这个jar。原来rt.jar 已经被包含在了classes.jar 里面了，所以我们就做一个连接连过去。

Note: 也许路径会有所不同。

sudo ln -s /System/Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Classes/jsse.jar /System/Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/home/lib/jsse.jar sudo ln -s /System/Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Classes/rt.jar /System/Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/home/lib/rt.jar

再次运行，刷新工程，就可以在target 文件夹下多了几个文件，progard_map.txt proguard_seeds.txt ... ok ,代码已经被混淆了，这样被反编译的可能性就降低了。
开始时最好不要把混淆打开，因为混淆会，如果代码报错，是定位不到代码行的，显示的事混淆以后的代码，都是小字母了
如果有更好的方式，或者不对的地方，请多指正！

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