Android 混淆那些事儿

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

proguardFiles getDefaultProguardFile('proguard-android.txt'),
                    'proguard-rules.pro'

 Starting with version 2.2 of the Android plugin for Gradle, this file is distributed together with
 the plugin and unpacked at build-time. The files in $ANDROID_HOME are no longer maintained and
 will be ignored by new version of the Android plugin for Gradle.

retrace.bat|retrace.sh [-verbose] mapping.txt [<stacktrace_file>]

retrace.sh -verbose mapping.txt obfuscated_trace.txt

不使用大小写混写类名
-dontusemixedcaseclassnames

不忽略公共类库
-dontskipnonpubliclibraryclasses

-dontoptimize
-dontpreverify

指定哪个属性不要混淆，可一次指定多个属性
-keepattributes [attribute_filter]

抛出异常时保留代码行号
-keepattributes SourceFile,LineNumberTable

重命名抛出异常时的文件名称
-renamesourcefileattribute SourceFile

-keep [,modifier,...] class_specification

指定类名不被改变
-keep public class com.google.vending.licensing.ILicensingService

指定使用了Keep注解的类和类成员都不被改变
-keep @android.support.annotation.Keep class * {*;}

-keepclassmembers [,modifier,...] class_specification

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

-keepclasseswithmembers [,modifier,...] class_specification

-keepclasseswithmembernames class * {
    native <methods>;
}

-dontnote com.android.vending.licensing.ILicensingService

-dontnote android.support.**

-dontwarn android.support.**

?    matches any single character in a name.(匹配一个字符)
*    matches any part of a name not containing the directory separator.（匹配一个名字，除了目录分隔符外的任意部分）
**    matches any part of a name, possibly containing any number of directory separators.(匹配任意名,可能包含任意路径分隔符)
!  exclude
<field>     匹配类中的所有字段
<method>    匹配类中所有的方法
<init>      匹配类中所有的构造函数

-keep class com.lily.test.** 本包和所包含子包下的类名都保持
-keep class com.lily.test.* 保持该包下的类名
-keep class com.lily.test.** {*;} 保持包和子包的类名和里面的内容均不被混淆

# 代码混淆压缩比，在0~7之间
-optimizationpasses 5# 混合时不使用大小写混合，混合后的类名为小写
-dontusemixedcaseclassnames

# 指定不去忽略非公共库的类
-dontskipnonpubliclibraryclasses

# 不做预校验，preverify是proguard的四个步骤之一，Android不需要preverify，去掉这一步能够加快混淆速度。
-dontpreverify

-verbose

#google推荐算法
-optimizations !code/simplification/arithmetic,!code/simplification/cast,!field/*,!class/merging/*

# 避免混淆Annotation、内部类、泛型、匿名类
-keepattributes *Annotation*,InnerClasses,Signature,EnclosingMethod

# 重命名抛出异常时的文件名称
-renamesourcefileattribute SourceFile

# 抛出异常时保留代码行号
-keepattributes SourceFile,LineNumberTable

# 处理support包
-dontnote android.support.**
-dontwarn android.support.**

# 保留四大组件，自定义的Application等这些类不被混淆
-keep public class * extends android.app.Activity
-keep public class * extends android.app.Appliction
-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.preference.Preference
-keep public class com.android.vending.licensing.ILicensingService

# 保留本地native方法不被混淆
-keepclasseswithmembernames class * {
    native <methods>;
}

# 保留枚举类不被混淆
-keepclassmembers enum * {
    public static **[] values();
    public static ** valueOf(java.lang.String);
}

# 保留Parcelable序列化类不被混淆
-keep class * implements android.os.Parcelable {
    public static final android.os.Parcelable$Creator *;
}

#第三方jar包不被混淆
-keep class com.github.test.** {*;}

#保留自定义的Test类和类成员不被混淆
-keep class com.lily.Test {*;}
#保留自定义的xlog文件夹下面的类、类成员和方法不被混淆
-keep class com.test.xlog.** {
    <fields>;
    <methods>;
}

#assume no side effects:删除android.util.Log输出的日志
-assumenosideeffects class android.util.Log {
    public static *** v(...);
    public static *** d(...);
    public static *** i(...);
    public static *** w(...);
    public static *** e(...);
}

#保留Keep注解的类名和方法
-keep,allowobfuscation @interface android.support.annotation.Keep
-keep @android.support.annotation.Keep class *
-keepclassmembers class * {
    @android.support.annotation.Keep *;
}

java -jar AndResGuard-cli-1.2.3.jar test.apk

static status_t makeFileResources(Bundle* bundle, const sp<AaptAssets>& assets,
                                      ResourceTable* table,
                                      const sp<ResourceTypeSet>& set,
                                      const char* resType)
    {
        String8 type8(resType);
        String16 type16(resType);

        bool hasErrors = false;

        ResourceDirIterator it(set, String8(resType));
        ssize_t res;
        while ((res=it.next()) == NO_ERROR) {
            if (bundle->getVerbose()) {
                printf("    (new resource id %s from %s)n",
                       it.getBaseName().string(), it.getFile()->getPrintableSource().string());
            }
            String16 baseName(it.getBaseName());
            const char16_t* str = baseName.string();
            const char16_t* const end = str + baseName.size();
            while (str < end) {
                if (!((*str >= 'a' && *str <= 'z')
                        || (*str >= '0' && *str <= '9')
                        || *str == '_' || *str == '.')) {
                    fprintf(stderr, "%s: Invalid file name: must contain only [a-z0-9_.]n",
                            it.getPath().string());
                    hasErrors = true;
                }
                str++;
            }
            String8 resPath = it.getPath();
            resPath.convertToResPath();

            String8 obfuscationName;
            String8 obfuscationPath = getObfuscationName(resPath, obfuscationName);

            table->addEntry(SourcePos(it.getPath(), 0), String16(assets->getPackage()),
                            type16,
                            baseName, // String16(obfuscationName),
                            String16(obfuscationPath), // resPath
                            NULL,
                            &it.getParams());
            assets->addResource(it.getLeafName(), obfuscationPath/*resPath*/, it.getFile(), type8);
        }
        return hasErrors ? UNKNOWN_ERROR : NO_ERROR;
    }

String8 obfuscationName;
String8 obfuscationPath = getObfuscationName(resPath, obfuscationName);

assets->addResource(it.getLeafName(), obfuscationPath/*resPath*/, it.getFile(), type8);