应用程序在启用minifyEnabled的情况下，使用Picasso时崩溃。

Question

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
Warning:there were 52 unresolved references to classes or interfaces.
Warning:Exception while processing task java.io.IOException: Please correct the above warnings first.
Error:Execution failed for task ':app:transformClassesAndResourcesWithProguardForRelease'.
Job failed, see logs for details

这是我在构建release.apk时遇到的错误。

我尝试通过添加以下内容来修复它：

-dontwarn com.squareup.picasso.**

在我的pro guard-rules.pro文件中。

发布版.apk现在可以正确构建，至少表面上是这样的。

但是当我在手机上安装应用程序（或任何手机上），它在启动时崩溃，我认为是在使用Picasso加载图像时发生的。

请帮我解决这个问题。

我已经尝试了一些在互联网上找到的解决方案，并且从您那里提出的建议，它们似乎都可以正确构建，但是应用程序仍然会崩溃。除了pro guard规则之外，它可能取决于其他东西吗？

这是我的gradle的外观：

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

- Daniele

---

https://github.com/krschultz/android-proguard-snippets/blob/master/libraries/proguard-square-picasso.pro - OneCricketeer

@cricket_007 谢谢，我也试过这个了，还是没有成功 :( - Daniele

那至少可以修复 Picasso，但不适用于其他库。 - OneCricketeer

@cricket_007，没有其他库发出任何警告。而且代码肯定没问题，因为在调试模式下构建apk时它是可以工作的。 - Daniele

@cricket_007 也没有运气 - Daniele

Answer 1

你似乎仍在缩小OkHTTP

无法找到引用的类 com.squareup.okhttp

前往Picasso的Github页面

-dontwarn com.squareup.okhttp.**

- OneCricketeer

---

谢谢您的回答。我也尝试使用了这个方法，但是没有成功。虽然它确实修复了问题，因为apk可以正常生成。但是当我安装应用程序时，一旦需要使用Picasso加载图像，应用程序就会在启动时崩溃。 - Daniele

你能过滤 logcat 中的错误而不是警告吗？ - OneCricketeer

你确定在Gradle中加载了正确的Proguard文件吗？ - OneCricketeer

这实际上修复了Picasso错误。应用程序崩溃是因为SearchView无法加载。我在我的混淆规则中添加了-keep class android.support.v7.widget.SearchView { *; }，现在应用程序运行得非常完美。 - Daniele

这不是关于“压缩OkHTTP”还是不压缩的问题。那应该是-keep。在这里我们有-dontwarn。文档中说：“指定完全不警告未解决的引用和其他重要问题。[...]忽略警告可能是危险的。例如，如果确实需要处理未解析的类或类成员，则处理后的代码将无法正常运行。”但是根据此问题，可以安全地忽略这些警告。 - caw

Answer 2

尝试将以下内容添加到您的 proguard.cfg 文件中：

#### -- Picasso --
 -dontwarn com.squareup.picasso.**

 #### -- OkHttp --

 -dontwarn com.squareup.okhttp.internal.**

 #### -- Apache Commons --

 -dontwarn org.apache.commons.logging.** 

- xbadal

---

谢谢回答，我会尝试一下。 - Daniele

我认为你想要使用 keep 而不是 dontwarn。 - OneCricketeer

没有任何问题，它能够成功构建，但在启动时一直崩溃。 - Daniele

@cricket_007 我应该“保留”什么？ - Daniele

@Daniele，这个答案只是消除了警告。它并不能解决类无法解析的问题。 - OneCricketeer

Answer 3

在 proguard-rules.pro 中添加以下行即可解决问题：

-dontwarn com.squareup.okhttp.**

- Fortnite Lover

Answer 4

在您的应用 gradle 中尝试以下内容

minifyEnabled false shrinkResources false

- Makvin

---

这个想法不好，你正在尝试禁用Proguard。 - Kneelon

Answer 5

我的问题是我无法使用 minifyEnabled true 生成已签名的 APK，我通过将以下内容添加到 proguard-rules.pro 文件中解决了这个问题：

#for Picasso library
-dontwarn okio.
# JSR 305 annotations are for embedding nullability information.
-dontwarn javax.annotation.**
# A resource is loaded with a relative path so the package of this class must be preserved.
-keepnames class okhttp3.internal.publicsuffix.PublicSuffixDatabase
# Animal Sniffer compileOnly dependency to ensure APIs are compatible with older versions of Java.
-dontwarn org.codehaus.mojo.animal_sniffer.*
# OkHttp platform used only on JVM and when Conscrypt dependency is available.
-dontwarn okhttp3.internal.platform.ConscryptPlatform

如果上述方法仍然存在问题，您可以尝试使用以下方法：

#for Picasso library
-dontwarn com.squareup.okhttp3.**
-keep class com.squareup.okhttp3.* { *;}
-dontwarn okio.
-dontwarn okhttp3.internal.platform.ConscryptPlatform
-dontwarn javax.annotation.Nullable
-dontwarn javax.annotation.ParametersAreNonnullByDefault

- Mohammed Fathi