Android Studio导出Jar包并混淆

最近公司项目需要AS混淆打jar，在百度上搜索“AS打jar包并混淆”，一下出来好多面，试了很多网上的方法几乎都出问题，最后根据其中一种自己做了修改，结果打jar并混淆成功，现在将成果分享给大家，希望能帮助大家。直接上代码

1.在你的build.gradle文件中加入代码

<span style="font-size: 16px;">import com.android.build.gradle.AppPlugin
import proguard.gradle.ProGuardTask

apply plugin: 'com.android.application'

android {
    compileSdkVersion 19
    buildToolsVersion "23.0.1"

    defaultConfig {
        applicationId "com.test.myapp"
        minSdkVersion 14
        targetSdkVersion 18
    }

    buildTypes {
        release {
            minifyEnabled true
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.txt'
        }
    }
}

dependencies {
    compile 'com.android.support:support-v4:19.1.0'
    compile files('libs/android-core-3.1.1.jar')
    compile files('libs/core-3.1.1.jar')
}

//dependsOn 可根据实际需要增加或更改
task buildJar(dependsOn: ['compileReleaseJavaWithJavac'], type: Jar) {

//    appendix = "demo"
    baseName = "MDCCode"
    version = "2.2.0"
//    classifier = "release"

    //后缀名
    extension = "jar"
    //最终的 Jar 包名，如果没设置，默认为 [baseName]-[appendix]-[version]-[classifier].[extension]
//    archiveName = "MDCCode.jar"

    //需打包的资源所在的路径集
    def srcClassDir = [project.buildDir.absolutePath + "/intermediates/classes/release"];
    //初始化资源路径集
    from srcClassDir

    //去除路径集下部分的资源
    exclude "com/topcode/mdccodesdk/MainActivity.class"
    exclude "com/topcode/mdccodesdk/MainActivity\$*.class"
    exclude "com/topcode/mdccodesdk/BuildConfig.class"
    exclude "com/topcode/mdccodesdk/BuildConfig\$*.class"
    exclude "**/R.class"
    exclude "**/R\$*.class"

    //只导入资源路径集下的部分资源
    include "com/**/*.class"

    //注: exclude include 支持可变长参数
}

task proguardJar(dependsOn: ['buildJar'], type: ProGuardTask) {
    //Android 默认的 proguard 文件
    configuration android.getDefaultProguardFile('proguard-android.txt')
    //会根据该文件对 Jar 进行混淆，注意：需要在 manifest 注册的组件也要加入该文件中
    configuration 'proguard-rules.pro'

    String inJar = buildJar.archivePath.getAbsolutePath()
    //输入 jar
    injars inJar
    //输出 jar
    outjars inJar.substring(0, inJar.lastIndexOf(File.separator)) + "/P${buildJar.archiveName}"

    //设置不删除未引用的资源(类，方法等)
    dontshrink

    AppPlugin appPlugin = getPlugins().findPlugin(AppPlugin)
    if (appPlugin != null) {
        List<String> runtimeJarList
        if (appPlugin.getMetaClass().getMetaMethod("getRuntimeJarList")) {
            runtimeJarList = appPlugin.getRuntimeJarList()
        } else if (android.getMetaClass().getMetaMethod("getBootClasspath")) {
            runtimeJarList = android.getBootClasspath()
        } else {
            runtimeJarList = appPlugin.getBootClasspath()
        }

        for (String runtimeJar : runtimeJarList) {
            //给 proguard 添加 runtime
            libraryjars(runtimeJar)
        }
    }
}

</span><span style="font-size:18px;">
</span>

<span style="font-size:18px;"></span><pre style="color: rgb(51, 51, 51); line-height: 27.2px; text-indent: 16px; font-family: Consolas; background-color: rgb(255, 255, 255);"><span style="font-size:18px;">minifyEnabled一定要设计为true</span>

2.在proguard-rules.pro文件中加入代码
# Add project specific ProGuard rules here.
# By default, the flags in this file are appended to flags specified
# in D:\Android\sdk\sdk-as\sdk/tools/proguard/proguard-android.txt
# You can edit the include path and order by changing the proguardFiles
# directive in build.gradle.
#
# For more details, see
#   http://developer.android.com/guide/developing/tools/proguard.html

# Add any project specific keep options here:

# If your project uses WebView with JS, uncomment the following
# and specify the fully qualified class name to the JavaScript interface
# class:
#-keepclassmembers class fqcn.of.javascript.interface.for.webview {
#   public *;
#}

-keepclassmembers class * extends android.app.Activity {
   public void *(android.view.View);
}

-keep interface com.test.callback.DecodeCallback {
    *;
}

-keep public class com.test.mdccode.Mde {
    *;
}
-keep public class com.test.mdccode.scanner.MScanner {
    *;
}
-keep public class com.test.mdccode.scanner.decode.BitmapDecoder {
    *;
}

-libraryjars libs/core-3.1.1.jar
-libraryjars libs/android-core-3.1.1.jar
在你的Terminal中执行
<pre name="code" class="html">gradlew<span style="font-family: Consolas; line-height: 27.2px;"> buildJar 这是打包不混淆的jar包</span>
<span style="font-family: Consolas; line-height: 27.2px;"></span><pre name="code" class="html" style="color: rgb(51, 51, 51); line-height: 27.2px; text-indent: 16px;">gradlew<span style="font-family: Consolas; line-height: 27.2px;"> </span><span style="font-family: Consolas; line-height: 27.2px; background-color: rgb(255, 255, 255);">proguardJar 打包代混淆的jar包</span>

以上是我的所有代码，希望可以帮助大家，如果有什么问题，可以留言给我，我会全力回答大家的问题，谢谢