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
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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 # 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 *;
}