Android App瘦身实操

未优化前：14MB, DownloadSize:12.7Mb（在AS中打开apk会显示）

1:AS -> refactor -> remove unused resources

做这步之前建议现在本地保留一份副本，如果报错，源文件也更好找一些
Apk size:13.6Mb, DownloadSize:12.5Mb

2:使用lint检查(AS中Analyze -> Run Inspection by name -> 输入unused resources)

步骤1已覆盖，无明显变化

3.tiny png大图压缩处理(https://tinypng.com/)

该步骤本人仅对所有超过100kb的图片处理

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4.webp压缩批处理（res目录下右键选择Convert to WebP ->75% quality有损压缩）

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5.冗余代码删除、精简、相关类资源删除

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6.开启Proguard-开启代码混淆

附上我的混淆配置文件内容吧，proguard-rulues.pro

# Add project specific ProGuard rules here.
# By default, the flags in this file are appended to flags specified
# in /Users/Chris/Library/Android/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:

#-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
#
#
#-libraryjars libs/pgyer_sdk_x.x.jar
#-dontwarn com.pgyersdk.**
#-keep class com.pgyersdk.** { *; }

# 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 *;
#}
#===================android=======================
-dontwarn
-optimizationpasses 5
-dontusemixedcaseclassnames
-dontskipnonpubliclibraryclasses
-dontpreverify
-verbose
-optimizations !code/simplification/arithmetic,!field/*,!class/merging/*

-keep public class * extends android.app.Fragment
-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
-dontwarn android.support.**
-keep class android.support.** { *; }
-keep class com.yto.camel.adapter.MyBaseAdapter {*;}

-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 *;
}

#===================BaiduLBS======================
-keep class com.baidu.** {*;}
-keep class vi.com.** {*;}
-dontwarn com.baidu.**

#==================JPush==========================
-dontoptimize
-dontpreverify

-dontwarn cn.jpush.**
-keep class cn.jpush.** { *; }
#==================gson==========================
-dontwarn com.google.**
-keep class com.google.gson.** {*;}

#==================protobuf======================
-dontwarn com.google.**
-keep class com.google.protobuf.** {*;}

#================picasso==========================
-dontwarn com.squareup.okhttp.**

#==================litepal=======================
-keep class org.litepal.** { *; }

#==================fastjson=======================
-dontwarn com.alibaba.fastjson.**
-keep class com.alibaba.fastjson.** { *; }
-keepattributes Signature      #避免混淆泛型
-keepattributes *Annotation    #不混淆注释
-keepattributes InnerClasses   #不混淆内部类

#===================pgy===================
#-libraryjars libs/pgyer_sdk_2.2.2.jar
-dontwarn com.pgyersdk.**
-keep class com.pgyersdk.** { *; }

#==================eventbus===============
-keep class org.simple.eventbus.** {*;}
-keepclassmembers class ** {
    public void onEvent*(**);
    void onEvent*(**);
    void onClick*(**);
}

#==================xUtils=================
#-libraryjars libs/xUtils-2.6.14.jar
-keep class com.lidroid.** { *; }
-keep class * extends java.lang.annotation.Annotation { *; }
-keep class org.xutils.** {*;}
-keepattributes *Annotation*
-keep public interface org.xutils.** {*;}

-dontwarn java.lang.annotation.Annotation

-keep class com.demo.bean.** { *; }

-keepattributes *Annotation*
-keep @**annotation** class * {*;}

-dontwarn com.qiyukf.**
-keep class com.qiyukf.** {*;}

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7.res/raw目录下新建keep.xml，开启严格模式资源压缩
格式如下：

<?xml version="1.0" encoding="utf-8"?>
<resources xmlns:tools="http://schemas.android.com/tools"
    tools:shrinkMode="strict" />

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8.资源混淆及7zip极限压缩(使用的是微信的开源方案)

首先，附上我的gradle配置,在app同目录下新建一个and_res_guard.gradle文件

apply plugin: 'AndResGuard'

andResGuard {
    // mappingFile = file("./resource_mapping.txt")
    mappingFile = null

    //Do NOT enable 7zip compression(use7zip) when you distribute your APP on Google
    //Play. It'll prevent the file-by-file patch when updating your APP.
    use7zip = true

    useSign = true
    // it will keep the origin path of your resources when it's true
    keepRoot = false
    // 设置这个值，会把arsc name列混淆成相同的名字，减少string常量池的大小
    fixedResName = "arg"
    // 打开这个开关会合并所有哈希值相同的资源，但请不要过度依赖这个功能去除去冗余资源
    mergeDuplicatedRes = true
    whiteList = [
            // your icon
            //表情
            "R.drawable.icon",

            // for fabric
            "R.string.com.crashlytics.*",
            // for google-services
            "R.string.google_app_id",
            "R.string.gcm_defaultSenderId",
            "R.string.default_web_client_id",
            "R.string.ga_trackingId",
            "R.string.firebase_database_url",
            "R.string.google_api_key",
            "R.string.google_crash_reporting_api_key"
    ]
    compressFilePattern = [
            "*.png",
            "*.jpg",
            "*.jpeg",
            "*.gif",
//Do NOT add resource.asrc into compressFilePattern unless the app size is really matter //to you.

    ]
    sevenzip {
        artifact = 'com.tencent.mm:SevenZip:1.2.17'
        //path = "/usr/local/bin/7za"
    }

    /**
     * 可选： 如果不设置则会默认覆盖assemble输出的apk
     **/
    // finalApkBackupPath = "${project.rootDir}/final.apk"

    /**
     * 可选: 指定v1签名时生成jar文件的摘要算法
     * 默认值为“SHA-1”
     **/
    // digestalg = "SHA-256"
}

在app目录下的build.gradle中添加

apply from: 'and_res_guard.gradle'

最后在附上我的buildTypes中的配置

buildTypes {
        debug{
            buildConfigField "boolean", "LOG_DEBUG", "false" //不显示log
            shrinkResources true //去除无用资源
            minifyEnabled true //开启混淆
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
            signingConfig signingConfigs.debug
        }

        release {
            // 不显示Log
            buildConfigField "boolean", "LOG_DEBUG", "false"
            //Zipalign优化
            zipAlignEnabled true
            // 移除无用的resource文件
            shrinkResources true
            //是否混淆
            minifyEnabled true
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
            //签名
            signingConfig signingConfigs.release
        }
    }

使用说明

在gradle:app->Tasks->andresguard->自己选择执行Debug包还是Release包

比如执行完resguardDebug脚本后，在app->build->outputs->apk->debug->AndResGuard_app-debug目录下，
app-debug_7zip_aligned_signed.apk就是最终对齐签名后的可发布包.

详细参考：https://github.com/shwenzhang/AndResGuard/blob/master/README.zh-cn.md

最终经过一系列处理后：包大小由14M优化缩减到9.3M，效果还是很不错的~

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