整了一天，感觉坑挺多。
1. 选择如图中的选项Android Studio进行签名打包：
2. 填写APP对应的信息：(最好用个文本记下来放在项目中同步给Team)
- Key store path: 如果是新APP则创建，如果已经有了选择就行；
- Key store password: *******
- Key alias（别名）: 自定义
- 如果是新创建的文件需要选择时间，整个25年足够用了，公司信息填上就OK
- 下一步后选择release就开始打包
3. Android Studio的混淆功能需要在Gradle中添加：
apply plugin: 'com.android.application' android { compileSdkVersion 19 buildToolsVersion '23.0.1' defaultConfig { applicationId "com.rayclear.juchang" minSdkVersion 17 targetSdkVersion 23 versionCode 4 versionName "1.03" } buildTypes { release { //代码混淆开关，一定要注意现在已经使用minifyEnabled代替runProguard了 minifyEnabled true // proguard-rules.pro 是当前使用的混淆文件（Eclipse中的proguard.cfg) proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro' } } packagingOptions { exclude 'META-INF/DEPENDENCIES' exclude 'META-INF/LICENSE' exclude 'META-INF/LICENSE.txt' exclude 'META-INF/license.txt' exclude 'META-INF/NOTICE' exclude 'META-INF/NOTICE.txt' exclude 'META-INF/notice.txt' exclude 'META-INF/ASL2.0' } compileOptions { sourceCompatibility JavaVersion.VERSION_1_7 targetCompatibility JavaVersion.VERSION_1_7 } }
4. 打包时遇到的问题：
1.一直处于Gradle Build Running... 被坑了两次，一直以为是真的在打包，IDE也木有个具体提示什么的，就干等了好久。 遇到这种情况，直接关掉Android Studio重新开始吧。正常来说一个普通的APP打包混淆时长也就是1～3分钟吧。 2.关于cache.properties.lock的错： Error:Timeout waiting to lock cp_proj class cache for build file '/Users/raomengyang/work/app/build.gradle' (/Users/raomengyang/.gradle/caches/2.8/scripts/build_aldsk0ke4ednnd4pf0nybqlhq/cp_proj). It is currently in use by another Gradle instance. Owner PID: unknown Our PID: 20080 Owner Operation: unknown Our operation: Initialize cache Lock file: /Users/raomengyang/.gradle/caches/2.8/scripts/build_aldsk0ke4ednnd4pf0nybqlhq/cp_proj/cache.properties.lock 之前遇到过同样的情况，是将带lock的文件给恢复权限解决的，可是这次不管用，于是退出AS重新来，每次遇到这个问题然后退出AS都会提示后台还有任务没有结束，所以这个错误个人感觉是AS还有后台任务没有被结束，以至于一直hold在这儿。 3.各种specified twice： java.io.IOException: The same input jar [/Users/raomengyang/work/app/libs/**] is specified twice. 删掉proguard文件中的重复声明引用的jar文件。 4.满天的Warning： Note: there were 157 duplicate class definitions. (http://proguard.sourceforge.net/manual/troubleshooting.html#duplicateclass) Warning:library class org.apache.http.auth.AuthenticationException extends or implements program class org.apache.http.ProtocolException Warning:library class org.apache.http.auth.MalformedChallengeException extends or implements program class org.apache.http.ProtocolException Warning:library class org.apache.http.auth.params.AuthParamBean extends or implements program class org.apache.http.params.HttpAbstractParamBean Warning:library class org.apache.http.client.NonRepeatableRequestException extends or implements program class org.apache.http.ProtocolException Warning:library class org.apache.http.client.RedirectException extends or implements program class org.apache.http.ProtocolException Warning:library class org.apache.http.client.entity.UrlEncodedFormEntity extends or implements program class org.apache.http.entity.StringEntity Warning:library class org.apache.http.client.methods.HttpEntityEnclosingRequestBase extends or implements program class org.apache.http.HttpEntityEnclosingRequest Warning:library class org.apache.http.client.methods.HttpRequestBase extends or implements program class org.apache.http.message.AbstractHttpMessage Warning:library class org.apache.http.client.methods.HttpUriRequest extends or implements program class org.apache.http.HttpRequest Warning:library class org.apache.http.client.params.AllClientPNames extends or implements program class org.apache.http.params.CoreConnectionPNames ………………………………………………………………………………………………Warning…………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………… ………………………………………………………………………………………………Warning…………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………… ………………………………………………………………………………………………Warning…………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………… ………………………………………………………………………………………………Warning…………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………… ………………………………………………………………………………………………Warning…………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………… ………………………………………………………………………………………………Warning…………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………… ………………………………………………………………………………………………Warning…………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………… Warning:library class org.apache.http.client.params.AllClientPNames extends or implements program class org.apache.http.params.CoreProtocolPNames Warning:library class org.apache.http.client.params.ClientParamBean extends or implements program class org.apache.http.params.HttpAbstractParamBean Warning:library class org.apache.http.client.protocol.RequestAddCookies extends or implements program class org.apache.http.HttpRequestInterceptor Warning:library class org.apache.http.client.protocol.RequestDefaultHeaders extends or implements program class org.apache.http.HttpRequestInterceptor Warning:library class org.apache.http.client.protocol.RequestProxyAuthentication extends or implements program class org.apache.http.HttpRequestInterceptor 该类问题都可以根据我们的class文件来进行以下声明： 例如：现在提示的是org.apache.http.* 这个包里的类有问题，那么就加入下述代码： -keep class org.apache.http.** { *; } -dontwarn org.apache.http.** 依此类推，注意一点，混淆完后，就算打包成功也需要再次测试，因为APP内部可能会出现上述问题。
5.包含JNI时，可能会将JNI的方法给混淆掉，详细情况参照：http://blog.csdn.net/qinlicang/article/details/6115804
5.关于proguard.pro文件里面的详细介绍：
#Author：未知，别的网友总结的，这里拿来给各位参考吧： #在proguard-rules.pro中加入以下代码，基本可以涵盖所有 -optimizationpasses 5 # 指定代码的压缩级别 -dontusemixedcaseclassnames # 是否使用大小写混合 -dontpreverify # 混淆时是否做预校验 -verbose # 混淆时是否记录日志 -optimizations !code/simplification/arithmetic,!field/*,!class/merging/* # 混淆时所采用的算法 -keep public class * extends android.app.Activity # 保持哪些类不被混淆 -keep public class * extends android.app.Application # 保持哪些类不被混淆 -keep public class * extends android.app.Service # 保持哪些类不被混淆 -keep public class * extends android.content.BroadcastReceiver # 保持哪些类不被混淆 -keep public class * extends android.content.ContentProvider # 保持哪些类不被混淆 -keep public class * extends android.app.backup.BackupAgentHelper # 保持哪些类不被混淆 -keep public class * extends android.preference.Preference # 保持哪些类不被混淆 -keep public class com.android.vending.licensing.ILicensingService # 保持哪些类不被混淆 -keepclasseswithmembernames class * { # 保持 native 方法不被混淆 native <methods>; } -keepclasseswithmembers class * { # 保持自定义控件类不被混淆 public <init>(android.content.Context, android.util.AttributeSet); } -keepclasseswithmembers class * {# 保持自定义控件类不被混淆 public <init>(android.content.Context, android.util.AttributeSet, int); } -keepclassmembers class * extends android.app.Activity { # 保持自定义控件类不被混淆 public void *(android.view.View); } -keepclassmembers enum * { # 保持枚举 enum 类不被混淆 public static **[] values(); public static ** valueOf(java.lang.String); } -keep class * implements android.os.Parcelable { # 保持 Parcelable 不被混淆 public static final android.os.Parcelable$Creator *; }