新版的sdk生成的混淆檔案為proguard-project.txt和project.properties。其中proguard-project.txt相當於原來的proguard.cfg。

        在project.properties中新增如下內容：

這樣，我們編譯專案的時候就會混淆程式碼。但是專案中用到的一些第三方jar包，如果也混淆的話，會出現一些apk編譯或執行錯誤，所以我們可以在proguard-project.txt中配置，使第三方jar包不混淆。

        語法：1. -libraryjars /libs/你的jar包名.jar  處理第三發jar包

               2.-keep class packagename.** {*;} 處理第三方jar包裡的類，其中packagename為第三方包的包名

               3.-ignorewarnings   是遮蔽警告

               4.-dontwarn  去掉警告

      內容：

            通用部分：

-optimizationpasses 5   //好像在哪看過要大於3，一般都用5
-dontusemixedcaseclassnames  
-dontskipnonpubliclibraryclasses  
-dontpreverify
-dontwarn   //忽略警告 也可以用-ignorewarnings
-verbose
-optimizations !code/simplification/arithmetic,!field/*,!class/merging/* 

//下面是一些繼承的android類，不混淆
-keep public class * extends android.app.Activity
-keep public class * extends android.app.Application  
-keep public class * extends android.app.Service
-keep public class * extends android.content.BroadcastReceiver  
-keep public class * extends android.content.ContentProvider
-keep public class * extends android.app.backup.BackupAgentHelper  
-keep public class * extends android.preference.Preference
-keep public class com.android.vending.licensing.ILicensingService

//natvie 方法不混淆
-keepclasseswithmembernames class * {
    native <methods>;  
} 

//對於所有類，有這個建構函式不進行混淆,主要是為了在layout中的，自定義的view 
-keepclasseswithmembers class * {                                                         
    public <init>(android.content.Context, android.util.AttributeSet);
}  
-keepclasseswithmembers class * {  
    public <init>(android.content.Context, android.util.AttributeSet, int);  
}  

//這個主要是在layout 中寫的onclick方法android:onclick="onClick"，不進行混淆
-keepclassmembers class * extends android.app.Activity {  
   public void *(android.view.View);  
}  
-keepclassmembers enum * {  
    public static **[] values();  
    public static ** valueOf(java.lang.String);  
}  
-keep class * implements android.os.Parcelable {  
  public static final android.os.Parcelable$Creator *;  
}
 

         這裡以經常用到的android-support-v4.jar  包為例

-libraryjars /libs/android-support-v4.jar//指出jar包路徑

//不對第三方的jar包的提出WARN
-dontwarn android.support.v4.**
-dontwarn android.support.v4.view.**

//這裡對用到的第三方jar包的類不進行混淆

-keep class android.support.v4.view.**{ *;} 
-keep public class * extends android.support.v4.**  
-keep public class * extends android.app.Fragment 
 

忽略內部類的方法：

-keep class com.zl.proguarddemo.MainActivity$Inner{

    public <fields>;

    public <methods>;

}

此處Inner為MainActivity的內部類(注意類路徑名寫全!!!)

比如有類為com.a.Test，這個類幾個內部類，混淆時，指定類似引數即可。
-keep public class com.a.Test$*
如果需要保留private的內部類，只需要去掉public

這裡小結一下：

          1. 對於引用第三方包的情況，可以採用下面方式避免打包出錯：
          -libraryjars /aaa.jar
          -dontwarn com.xx.yy.**
          -keep class com.xx.yy.** { *;}

         2.第三方jar包中如果有.so檔案，不用去理會，引入的第三方jar檔案不要混淆，否則可能會報異常

最後，提供一個完成的proguard-project.txt供大家參考：

# To enable ProGuard in your project, edit project.properties
# to define the proguard.config property as described in that file.
#
# Add project specific ProGuard rules here.
# By default, the flags in this file are appended to flags specified
# in ${sdk.dir}/tools/proguard/proguard-android.txt
# You can edit the include path and order by changing the ProGuard
# include property in project.properties.
#
# 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 *;
#}

-optimizationpasses 5 
-dontusemixedcaseclassnames  
-dontskipnonpubliclibraryclasses  
-dontpreverify
-dontwarn
-verbose
-optimizations !code/simplification/arithmetic,!field/*,!class/merging/* 

-keep public class * extends android.app.Activity
-keep public class * extends android.app.Application  
-keep public class * extends android.app.Service
-keep public class * extends android.content.BroadcastReceiver  
-keep public class * extends android.content.ContentProvider
-keep public class * extends android.app.backup.BackupAgentHelper  
-keep public class * extends android.preference.Preference
-keep public class com.android.vending.licensing.ILicensingService

-keepclasseswithmembernames class * {
    native <methods>;  
}  
-keepclasseswithmembers class * {                                                         
    public <init>(android.content.Context, android.util.AttributeSet);
}  
-keepclasseswithmembers class * {  
    public <init>(android.content.Context, android.util.AttributeSet, int);  
}  
-keepclassmembers class * extends android.app.Activity {  
   public void *(android.view.View);  
}  
-keepclassmembers enum * {  
    public static **[] values();  
    public static ** valueOf(java.lang.String);  
}  
-keep class * implements android.os.Parcelable {  
  public static final android.os.Parcelable$Creator *;  
}

-libraryjars /libs/android-support-v4.jar
     
-dontwarn android.support.v4.**
-dontwarn android.support.v4.view.**

-keep class android.support.v4.view.**{ *;} 
-keep public class * extends android.support.v4.**  
-keep public class * extends android.app.Fragment 

-libraryjars /libs/gdx-backend-android.jar
-libraryjars /libs/gdx.jar

-dontwarn com.badlogic.**

-keep class com.badlogic.gdx.backends.android.**{ *;} 
-keep class com.badlogic.gdx.**{ *;}
-keep class com.badlogic.gdx.graphics.g2d.**{ *;}
-keep class com.badlogic.gdx.graphics.**{ *;}