Question

当我尝试在android studio 1.5.1中生成签名Apk并完成关于此过程的Dialog时，我面对此消息并构建中止：

    Warning:com.squareup.picasso.OkHttpDownloader: can't find referenced class com.squareup.okhttp.OkHttpClient
    Warning:com.squareup.picasso.OkHttpDownloader: can't find referenced class com.squareup.okhttp.Cache
    Warning:com.squareup.picasso.OkHttpDownloader: can't find referenced class com.squareup.okhttp.OkHttpClient
    Warning:com.squareup.picasso.OkHttpDownloader: can't find referenced class com.squareup.okhttp.CacheControl
    Warning:com.squareup.picasso.OkHttpDownloader: can't find referenced class com.squareup.okhttp.CacheControl$Builder
    Warning:com.squareup.picasso.OkHttpDownloader: can't find referenced class com.squareup.okhttp.Request$Builder
    Warning:com.squareup.picasso.OkHttpDownloader: can't find referenced class com.squareup.okhttp.OkHttpClient
    Warning:com.squareup.picasso.OkHttpDownloader: can't find referenced class com.squareup.okhttp.Call
    Warning:com.squareup.picasso.OkHttpDownloader: can't find referenced class com.squareup.okhttp.Response
    Warning:com.squareup.picasso.OkHttpDownloader: can't find referenced class com.squareup.okhttp.ResponseBody
    Warning:com.squareup.picasso.OkHttpDownloader: can't find referenced class com.squareup.okhttp.Response
    Warning:com.squareup.picasso.OkHttpDownloader: can't find referenced class com.squareup.okhttp.ResponseBody
    Warning:com.squareup.picasso.OkHttpDownloader: can't find referenced class com.squareup.okhttp.OkHttpClient
    Warning:com.squareup.picasso.OkHttpDownloader: can't find referenced class com.squareup.okhttp.Cache
    Warning:com.squareup.picasso.OkHttpDownloader: can't find referenced class com.squareup.okhttp.CacheControl
    Warning:com.squareup.picasso.OkHttpDownloader: can't find referenced class com.squareup.okhttp.CacheControl$Builder
    Warning:com.squareup.picasso.OkHttpDownloader: can't find referenced class com.squareup.okhttp.Request$Builder
    Warning:com.squareup.picasso.OkHttpDownloader: can't find referenced class com.squareup.okhttp.Response
    Warning:com.squareup.picasso.OkHttpDownloader: can't find referenced class com.squareup.okhttp.Cache
    Warning:com.squareup.picasso.OkHttpDownloader: can't find referenced class com.squareup.okhttp.CacheControl
    Warning:com.squareup.picasso.OkHttpDownloader: can't find referenced class com.squareup.okhttp.Request
    Warning:com.squareup.picasso.OkHttpDownloader: can't find referenced class com.squareup.okhttp.Call
    Warning:com.squareup.picasso.OkHttpDownloader: can't find referenced class com.squareup.okhttp.Response
    Warning:com.squareup.picasso.OkHttpDownloader: can't find referenced class com.squareup.okhttp.ResponseBody
    Warning:com.squareup.picasso.OkHttpDownloader: can't find referenced class com.squareup.okhttp.OkHttpClient
    Warning:com.squareup.picasso.OkHttpDownloader: can't find referenced class com.squareup.okhttp.CacheControl$Builder
    Warning:com.squareup.picasso.OkHttpDownloader: can't find referenced class com.squareup.okhttp.CacheControl
    Warning:com.squareup.picasso.OkHttpDownloader: can't find referenced class com.squareup.okhttp.Request$Builder
    Warning:com.squareup.picasso.OkHttpDownloader: can't find referenced class com.squareup.okhttp.Response
    Warning:com.squareup.picasso.OkHttpDownloader: can't find referenced class com.squareup.okhttp.ResponseBody
    Warning:com.squareup.picasso.OkHttpDownloader: can't find referenced class com.squareup.okhttp.Cache

的build.gradle：

    apply plugin: 'com.android.application'

android {
    compileSdkVersion 23
    buildToolsVersion "23.0.2"

    defaultConfig {
        ....
        minSdkVersion 16
        targetSdkVersion 23
        versionCode 1
        versionName "1.0"
    }
    buildTypes {
        release {
            minifyEnabled true
            consumerProguardFiles 'proguard-rules.txt'
        }
    }
}

dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])
    compile 'com.android.support:appcompat-v7:23.4.0'
    compile 'com.android.support:design:23.4.0'
    compile 'com.android.support:support-v4:23.4.0'
    compile 'de.hdodenhof:circleimageview:1.3.0'
    compile 'com.jakewharton:butterknife:8.0.1'
    android{
        useLibrary  'org.apache.http.legacy'
    }
    compile 'com.squareup.picasso:picasso:2.5.2'
    compile 'com.onesignal:OneSignal:2.+@aar'
    compile 'com.google.android.gms:play-services-gcm:8.4.0'
    compile 'com.google.android.gms:play-services-analytics:+'
    compile 'com.google.android.gms:play-services-location:+'
    compile 'com.google.android.gms:play-services-appindexing:8.4.0'
    compile 'com.github.lzyzsd:circleprogress:1.1.0@aar'
}

proguard-rules.txt：

    # This is a configuration file for ProGuard.
# http://proguard.sourceforge.net/index.html#manual/usage.html

# Optimizations: If you don't want to optimize, use the
# proguard-android.txt configuration file instead of this one, which
# turns off the optimization flags.  Adding optimization introduces
# certain risks, since for example not all optimizations performed by
# ProGuard works on all versions of Dalvik.  The following flags turn
# off various optimizations known to have issues, but the list may not
# be complete or up to date. (The "arithmetic" optimization can be
# used if you are only targeting Android 2.0 or later.)  Make sure you
# test thoroughly if you go this route.
-optimizations !code/simplification/arithmetic,!code/simplification/cast,!field/*,!class/merging/*
-optimizationpasses 5
-allowaccessmodification
-dontpreverify

# The remainder of this file is identical to the non-optimized version
# of the Proguard configuration file (except that the other file has
# flags to turn off optimization).

-dontusemixedcaseclassnames
-dontskipnonpubliclibraryclasses
-verbose

-keepattributes *Annotation*
-keep public class com.google.vending.licensing.ILicensingService
-keep public class com.android.vending.licensing.ILicensingService

# For native methods, see http://proguard.sourceforge.net/manual/examples.html#native
-keepclasseswithmembernames class * {
    native <methods>;
}

# keep setters in Views so that animations can still work.
# see http://proguard.sourceforge.net/manual/examples.html#beans
-keepclassmembers public class * extends android.view.View {
   void set*(***);
   *** get*();
}

# We want to keep methods in Activity that could be used in the XML attribute onClick
-keepclassmembers class * extends android.app.Activity {
   public void *(android.view.View);
}

# For enumeration classes, see http://proguard.sourceforge.net/manual/examples.html#enumerations
-keepclassmembers enum * {
    public static **[] values();
    public static ** valueOf(java.lang.String);
}

-keepclassmembers class * implements android.os.Parcelable {
  public static final android.os.Parcelable$Creator CREATOR;
}

-keepclassmembers class **.R$* {
    public static <fields>;
}

# The support library contains references to newer platform versions.
# Don't warn about those in case this app is linking against an older
# platform version.  We know about them, and they are safe.
-dontwarn android.support.**

-keep com.squareup.picasso.** { ; }
-dontwarn com.squareup.picasso.*

经过大量搜索，我明白我应该使用-dontwarn com.squareup.picasso.*，但什么都没发生！我仍然有同样的问题。

Answer 1

build.gradle中有几个错误。让我们解决它们，它应该为你解决问题。

Gradle脚本中的ProGuard配置文件定义

这可能是您遇到问题的根本原因。您确定使用了ProGuard配置文件proguard-rules.txt吗？因为构建脚本似乎不是这样。你用

android {
    …
    buildTypes {
        release {
            minifyEnabled true
            consumerProguardFiles 'proguard-rules.txt'
        }
    }
}

但该配置对应用程序无效，consumerProguardFiles仅适用于Android库项目。它告诉库项目将指定的ProGuard配置文件打包到输出aar。

在申请中你必须使用

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

config proguardFiles告诉构建应用指定的ProGuard配置文件。这意味着它没有为您的构建定义。

请注意，默认的ProGuard文件包含所有Android应用程序所必需的常规Android规则（并且某些规则由Android Gradle插件添加）。您似乎将大多数默认规则复制到配置中。最佳做法是使用默认的ProGuard配置文件，不要将它们复制到您自己的配置中。

调整ProGuard配置规则

您不需要此规则

-keep com.squareup.picasso.** { ; }

添加忽略那些毕加索警告的规则。你可以使用

-dontwarn com.squareup.okhttp.**

或

-dontwarn com.squareup.picasso.OkHttpDownloader

将useLibrary声明放在正确的位置。

这是一件小事，但你应该先解决它。不要将useLibrary放入dependencies关闭。它属于android封闭。

android {
    compileSdkVersion 23
    buildToolsVersion "23.0.2"
    useLibrary 'org.apache.http.legacy'
    …
}

HttpClient

OkHttp

Answer 2

在build.gradle中这样做：

android {
    compileSdkVersion 23
    buildToolsVersion "23.0.0"
    useLibrary 'org.apache.http.legacy'
    ...
}

Answer 3

以下是Jake Wharton对Picasso的回答和Proguard配置：

### PICASSO

# Checks for OkHttp versions on the classpath to determine Downloader to use.
-dontnote com.squareup.picasso.Utils
# Downloader used only when OkHttp 2.x is present on the classpath.
-dontwarn com.squareup.picasso.OkHttpDownloader
# Downloader used only when OkHttp 3.x is present on the classpath.
-dontwarn com.squareup.picasso.OkHttp3Downloader


### OKHTTP

# Platform calls Class.forName on types which do not exist on Android to determine platform.
-dontnote okhttp3.internal.Platform


### OKIO

# java.nio.file.* usage which cannot be used at runtime. Animal sniffer annotation.
-dontwarn okio.Okio
# JDK 7-only method which is @hide on Android. Animal sniffer annotation.
-dontwarn okio.DeflaterSink

Github issue in Picasso

任务执行失败＆＃39;：app：transformClassesAndResourcesWithProguardForRelease＆＃39;。＆GT; java.io.IOException：请先纠正上面的警告

3 个答案:

任务执行失败＆＃39;：app：transformClassesAndResourcesWithProguardForRelease＆＃39;。 ＆GT; java.io.IOException：请先纠正上面的警告

3 个答案:

任务执行失败＆＃39;：app：transformClassesAndResourcesWithProguardForRelease＆＃39;。＆GT; java.io.IOException：请先纠正上面的警告