生成签名 APK 时出现 Proguard 错误

Question

我在 build.gradle 文件中将 minifyEnabled 设置为 true。 在为我的应用生成签名 APK 时出现很多错误：

Warning:com.dropbox.core.http.OkHttp3Requestor$AsyncCallback: can't find superclass or interface okhttp3.Callback
Warning:com.dropbox.core.http.OkHttp3Requestor$PipedRequestBody: can't find superclass or interface okhttp3.RequestBody
Warning:com.dropbox.core.http.OkHttpRequestor$AsyncCallback: can't find superclass or interface com.squareup.okhttp.Callback
Warning:com.dropbox.core.http.OkHttpRequestor$PipedRequestBody: can't find superclass or interface com.squareup.okhttp.RequestBody
Warning:com.dropbox.core.DbxStandardSessionStore: can't find referenced class javax.servlet.http.HttpSession
Warning:com.dropbox.core.http.GoogleAppEngineRequestor: can't find referenced class com.google.appengine.api.urlfetch.URLFetchServiceFactory
Warning:com.dropbox.core.http.GoogleAppEngineRequestor: can't find referenced class com.google.appengine.api.urlfetch.HTTPMethod
Warning:com.dropbox.core.http.GoogleAppEngineRequestor: can't find referenced class com.google.appengine.api.urlfetch.URLFetchService
Warning:com.dropbox.core.http.GoogleAppEngineRequestor: can't find referenced class com.google.appengine.api.urlfetch.HTTPMethod
Warning:com.dropbox.core.http.GoogleAppEngineRequestor: can't find referenced class com.google.appengine.api.urlfetch.HTTPRequest
Warning:com.dropbox.core.http.GoogleAppEngineRequestor: can't find referenced class com.google.appengine.api.urlfetch.HTTPHeader
Warning:com.dropbox.core.http.GoogleAppEngineRequestor: can't find referenced class com.google.appengine.api.urlfetch.HTTPRequest
Warning:com.dropbox.core.http.GoogleAppEngineRequestor: can't find referenced class com.google.appengine.api.urlfetch.FetchOptions$Builder
Warning:com.dropbox.core.http.GoogleAppEngineRequestor: can't find referenced class com.google.appengine.api.urlfetch.FetchOptions
Warning:com.dropbox.core.http.GoogleAppEngineRequestor: can't find referenced class com.google.appengine.api.urlfetch.HTTPResponse
Warning:com.dropbox.core.http.GoogleAppEngineRequestor: can't find referenced class com.google.appengine.api.urlfetch.HTTPHeader
Warning:com.dropbox.core.http.GoogleAppEngineRequestor: can't find referenced class com.google.appengine.api.urlfetch.HTTPResponse
Warning:com.dropbox.core.http.GoogleAppEngineRequestor: can't find referenced class com.google.appengine.api.urlfetch.FetchOptions
Warning:com.dropbox.core.http.GoogleAppEngineRequestor: can't find referenced class com.google.appengine.api.urlfetch.URLFetchService
Warning:com.dropbox.core.http.GoogleAppEngineRequestor: can't find referenced class com.google.appengine.api.urlfetch.HTTPRequest
Warning:com.dropbox.core.http.GoogleAppEngineRequestor: can't find referenced class com.google.appengine.api.urlfetch.HTTPHeader
Warning:com.dropbox.core.http.GoogleAppEngineRequestor: can't find referenced class com.google.appengine.api.urlfetch.URLFetchServiceFactory
Warning:com.dropbox.core.http.GoogleAppEngineRequestor: can't find referenced class com.google.appengine.api.urlfetch.HTTPMethod
Warning:com.dropbox.core.http.GoogleAppEngineRequestor: can't find referenced class com.google.appengine.api.urlfetch.URLFetchService
Warning:com.dropbox.core.http.GoogleAppEngineRequestor: can't find referenced class com.google.appengine.api.urlfetch.FetchOptions$Builder
Warning:com.dropbox.core.http.GoogleAppEngineRequestor: can't find referenced class com.google.appengine.api.urlfetch.FetchOptions
Warning:com.dropbox.core.http.GoogleAppEngineRequestor: can't find referenced class com.google.appengine.api.urlfetch.HTTPResponse
Warning:com.dropbox.core.http.GoogleAppEngineRequestor: can't find referenced class com.google.appengine.api.urlfetch.URLFetchService
Warning:com.dropbox.core.http.GoogleAppEngineRequestor: can't find referenced class com.google.appengine.api.urlfetch.FetchOptions
Warning:com.dropbox.core.http.GoogleAppEngineRequestor: can't find referenced class com.google.appengine.api.urlfetch.URLFetchService
Warning:com.dropbox.core.http.GoogleAppEngineRequestor: can't find referenced class com.google.appengine.api.urlfetch.FetchOptions
Warning:com.dropbox.core.http.GoogleAppEngineRequestor: can't find referenced class com.google.appengine.api.urlfetch.URLFetchService
Warning:com.dropbox.core.http.GoogleAppEngineRequestor: can't find referenced class com.google.appengine.api.urlfetch.FetchOptions
Warning:com.dropbox.core.http.GoogleAppEngineRequestor: can't find referenced class com.google.appengine.api.urlfetch.URLFetchService
Warning:com.dropbox.core.http.GoogleAppEngineRequestor: can't find referenced class com.google.appengine.api.urlfetch.HTTPRequest
Warning:com.dropbox.core.http.GoogleAppEngineRequestor: can't find referenced class com.google.appengine.api.urlfetch.HTTPResponse
Warning:com.dropbox.core.http.GoogleAppEngineRequestor: can't find referenced class com.google.appengine.api.urlfetch.HTTPRequest
Warning:com.dropbox.core.http.GoogleAppEngineRequestor: can't find referenced class com.google.appengine.api.urlfetch.HTTPMethod
Warning:com.dropbox.core.http.GoogleAppEngineRequestor: can't find referenced class com.google.appengine.api.urlfetch.HTTPRequest
Warning:com.dropbox.core.http.GoogleAppEngineRequestor: can't find referenced class com.google.appengine.api.urlfetch.HTTPMethod
Warning:com.dropbox.core.http.GoogleAppEngineRequestor: can't find referenced class com.google.appengine.api.urlfetch.HTTPRequest
Warning:com.dropbox.core.http.GoogleAppEngineRequestor: can't find referenced class com.google.appengine.api.urlfetch.HTTPMethod
Warning:com.dropbox.core.http.GoogleAppEngineRequestor: can't find referenced class com.google.appengine.api.urlfetch.HTTPRequest
Warning:com.dropbox.core.http.GoogleAppEngineRequestor: can't find referenced class com.google.appengine.api.urlfetch.FetchOptions
Warning:com.dropbox.core.http.GoogleAppEngineRequestor: can't find referenced class com.google.appengine.api.urlfetch.HTTPResponse
Warning:com.dropbox.core.http.GoogleAppEngineRequestor: can't find referenced class com.google.appengine.api.urlfetch.HTTPHeader
Warning:com.dropbox.core.http.GoogleAppEngineRequestor: can't find referenced class com.google.appengine.api.urlfetch.HTTPResponse
Warning:com.dropbox.core.http.GoogleAppEngineRequestor$FetchServiceUploader: can't find referenced class com.google.appengine.api.urlfetch.HTTPRequest
Warning:com.dropbox.core.http.GoogleAppEngineRequestor$FetchServiceUploader: can't find referenced class com.google.appengine.api.urlfetch.URLFetchService
Warning:com.dropbox.core.http.GoogleAppEngineRequestor$FetchServiceUploader: can't find referenced class com.google.appengine.api.urlfetch.HTTPRequest
Warning:com.dropbox.core.http.GoogleAppEngineRequestor$FetchServiceUploader: can't find referenced class com.google.appengine.api.urlfetch.URLFetchService
Warning:com.dropbox.core.http.GoogleAppEngineRequestor$FetchServiceUploader: can't find referenced class com.google.appengine.api.urlfetch.HTTPRequest
Warning:com.dropbox.core.http.GoogleAppEngineRequestor$FetchServiceUploader: can't find referenced class com.google.appengine.api.urlfetch.URLFetchService
Warning:com.dropbox.core.http.GoogleAppEngineRequestor$FetchServiceUploader: can't find referenced class com.google.appengine.api.urlfetch.HTTPRequest
Warning:com.dropbox.core.http.GoogleAppEngineRequestor$FetchServiceUploader: can't find referenced class com.google.appengine.api.urlfetch.URLFetchService
Warning:com.dropbox.core.http.GoogleAppEngineRequestor$FetchServiceUploader: can't find referenced class com.google.appengine.api.urlfetch.HTTPRequest
Warning:com.dropbox.core.http.GoogleAppEngineRequestor$FetchServiceUploader: can't find referenced class com.google.appengine.api.urlfetch.HTTPResponse
Warning:com.dropbox.core.http.OkHttp3Requestor: can't find referenced class okhttp3.OkHttpClient$Builder
Warning:com.dropbox.core.http.OkHttp3Requestor: can't find referenced class okhttp3.OkHttpClient
Warning:com.dropbox.core.http.OkHttp3Requestor: can't find referenced class okhttp3.Dispatcher
Warning:com.dropbox.core.http.OkHttp3Requestor: can't find referenced class okhttp3.Request$Builder
Warning:com.dropbox.core.http.OkHttp3Requestor: can't find referenced class okhttp3.OkHttpClient
Warning:com.dropbox.core.http.OkHttp3Requestor: can't find referenced class okhttp3.Call
Warning:com.dropbox.core.http.OkHttp3Requestor: can't find referenced class okhttp3.Response
Warning:com.dropbox.core.http.OkHttp3Requestor: can't find referenced class okhttp3.ResponseBody
Warning:com.dropbox.core.http.OkHttp3Requestor: can't find referenced class okhttp3.Request$Builder
Warning:com.dropbox.core.http.OkHttp3Requestor: can't find referenced class okhttp3.Headers
Warning:com.dropbox.core.http.OkHttp3Requestor: can't find referenced class okhttp3.OkHttpClient
Warning:com.dropbox.core.http.OkHttp3Requestor: can't find referenced class okhttp3.Dispatcher
Warning:com.dropbox.core.http.OkHttp3Requestor: can't find referenced class okhttp3.Request
Warning:com.dropbox.core.http.OkHttp3Requestor: can't find referenced class okhttp3.Call
Warning:com.dropbox.core.http.OkHttp3Requestor: can't find referenced class okhttp3.Response
Warning:com.dropbox.core.http.OkHttp3Requestor: can't find referenced class okhttp3.ResponseBody
Warning:com.dropbox.core.http.OkHttp3Requestor: can't find referenced class okhttp3.Headers
Warning:com.dropbox.core.http.OkHttp3Requestor: can't find referenced class okhttp3.OkHttpClient
Warning:com.dropbox.core.http.OkHttp3Requestor: can't find referenced class okhttp3.Request$Builder
Warning:com.dropbox.core.http.OkHttp3Requestor: can't find referenced class okhttp3.Response
Warning:com.dropbox.core.http.OkHttp3Requestor: can't find referenced class okhttp3.Request$Builder
Warning:com.dropbox.core.http.OkHttp3Requestor: can't find referenced class okhttp3.Response
Warning:com.dropbox.core.http.OkHttp3Requestor: can't find referenced class okhttp3.Request$Builder
Warning:com.dropbox.core.http.OkHttp3Requestor: can't find referenced class okhttp3.Headers
Warning:com.dropbox.core.http.OkHttp3Requestor: can't find referenced class okhttp3.OkHttpClient
Warning:com.dropbox.core.http.OkHttp3Requestor: can't find referenced class okhttp3.Headers
Warning:com.dropbox.core.http.OkHttp3Requestor$AsyncCallback: can't find referenced class okhttp3.Callback
Warning:com.dropbox.core.http.OkHttp3Requestor$AsyncCallback: can't find referenced class okhttp3.Response
Warning:com.dropbox.core.http.OkHttp3Requestor$AsyncCallback: can't find referenced class okhttp3.Call
Warning:com.dropbox.core.http.OkHttp3Requestor$AsyncCallback: can't find referenced class okhttp3.Response
Warning:com.dropbox.core.http.OkHttp3Requestor$AsyncCallback: can't find referenced class okhttp3.Call
Warning:com.dropbox.core.http.OkHttp3Requestor$AsyncCallback: can't find referenced class okhttp3.Response
Warning:com.dropbox.core.http.OkHttp3Requestor$BufferedUploader: can't find referenced class okhttp3.Request$Builder
Warning:com.dropbox.core.http.OkHttp3Requestor$BufferedUploader: can't find referenced class okhttp3.OkHttpClient
Warning:com.dropbox.core.http.OkHttp3Requestor$BufferedUploader: can't find referenced class okhttp3.Call
Warning:com.dropbox.core.http.OkHttp3Requestor$BufferedUploader: can't find referenced class okhttp3.Request$Builder
Warning:com.dropbox.core.http.OkHttp3Requestor$BufferedUploader: can't find referenced class okhttp3.RequestBody
Warning:com.dropbox.core.http.OkHttp3Requestor$BufferedUploader: can't find referenced class okhttp3.Call
Warning:com.dropbox.core.http.OkHttp3Requestor$BufferedUploader: can't find referenced class okhttp3.Response
Warning:com.dropbox.core.http.OkHttp3Requestor$BufferedUploader: can't find referenced class okhttp3.ResponseBody
Warning:com.dropbox.core.http.OkHttp3Requestor$BufferedUploader: can't find referenced class okhttp3.Request$Builder
Warning:com.dropbox.core.http.OkHttp3Requestor$BufferedUploader: can't find referenced class okhttp3.Response
Warning:com.dropbox.core.http.OkHttp3Requestor$BufferedUploader: can't find referenced class okhttp3.OkHttpClient
Warning:com.dropbox.core.http.OkHttp3Requestor$BufferedUploader: can't find referenced class okhttp3.Call
Warning:com.dropbox.core.http.OkHttp3Requestor$BufferedUploader: can't find referenced class okhttp3.RequestBody
Warning:com.dropbox.core.http.OkHttp3Requestor$BufferedUploader: can't find referenced class okhttp3.Response
Warning:com.dropbox.core.http.OkHttp3Requestor$BufferedUploader: can't find referenced class okhttp3.ResponseBody
Warning:com.dropbox.core.http.OkHttp3Requestor$BufferedUploader: can't find referenced class okhttp3.Request
Warning:com.dropbox.core.http.OkHttp3Requestor$BufferedUploader: can't find referenced class okhttp3.Request$Builder
Warning:com.dropbox.core.http.OkHttp3Requestor$BufferedUploader: can't find referenced class okhttp3.RequestBody
Warning:com.dropbox.core.http.OkHttp3Requestor$BufferedUploader: can't find referenced class okhttp3.Call
Warning:com.dropbox.core.http.OkHttp3Requestor$BufferedUploader: can't find referenced class okhttp3.Request$Builder
Warning:com.dropbox.core.http.OkHttp3Requestor$BufferedUploader: can't find referenced class okhttp3.RequestBody
Warning:com.dropbox.core.http.OkHttp3Requestor$BufferedUploader: can't find referenced class okhttp3.Response
Warning:com.dropbox.core.http.OkHttp3Requestor$PipedRequestBody: can't find referenced class okhttp3.RequestBody
Warning:com.dropbox.core.http.OkHttp3Requestor$PipedRequestBody: can't find referenced class okhttp3.MediaType
Warning:com.dropbox.core.http.OkHttp3Requestor$PipedRequestBody: can't find referenced class okio.BufferedSink
Warning:com.dropbox.core.http.OkHttpRequestor: can't find referenced class com.squareup.okhttp.OkHttpClient
Warning:com.dropbox.core.http.OkHttpRequestor: can't find referenced class com.squareup.okhttp.Dispatcher
Warning:com.dropbox.core.http.OkHttpRequestor: can't find referenced class com.squareup.okhttp.OkHttpClient
Warning:com.dropbox.core.http.OkHttpRequestor: can't find referenced class com.squareup.okhttp.Request$Builder
Warning:com.dropbox.core.http.OkHttpRequestor: can't find referenced class com.squareup.okhttp.OkHttpClient
Warning:com.dropbox.core.http.OkHttpRequestor: can't find referenced class com.squareup.okhttp.Call
Warning:com.dropbox.core.http.OkHttpRequestor: can't find referenced class com.squareup.okhttp.Response
Warning:com.dropbox.core.http.OkHttpRequestor: can't find referenced class com.squareup.okhttp.ResponseBody
Warning:com.dropbox.core.http.OkHttpRequestor: can't find referenced class com.squareup.okhttp.Request$Builder
Warning:com.dropbox.core.http.OkHttpRequestor: can't find referenced class com.squareup.okhttp.Headers
Warning:com.dropbox.core.http.OkHttpRequestor: can't find referenced class com.squareup.okhttp.OkHttpClient
Warning:com.dropbox.core.http.OkHttpRequestor: can't find referenced class com.squareup.okhttp.Dispatcher
Warning:com.dropbox.core.http.OkHttpRequestor: can't find referenced class com.squareup.okhttp.Request
Warning:com.dropbox.core.http.OkHttpRequestor: can't find referenced class com.squareup.okhttp.Call
Warning:com.dropbox.core.http.OkHttpRequestor: can't find referenced class com.squareup.okhttp.Response
Warning:com.dropbox.core.http.OkHttpRequestor: can't find referenced class com.squareup.okhttp.ResponseBody
Warning:com.dropbox.core.http.OkHttpRequestor: can't find referenced class com.squareup.okhttp.Headers
Warning:com.dropbox.core.http.OkHttpRequestor: can't find referenced class com.squareup.okhttp.OkHttpClient
Warning:com.dropbox.core.http.OkHttpRequestor: can't find referenced class com.squareup.okhttp.Request$Builder
Warning:com.dropbox.core.http.OkHttpRequestor: can't find referenced class com.squareup.okhttp.Response
Warning:com.dropbox.core.http.OkHttpRequestor: can't find referenced class com.squareup.okhttp.Request$Builder
Warning:com.dropbox.core.http.OkHttpRequestor: can't find referenced class com.squareup.okhttp.Response
Warning:com.dropbox.core.http.OkHttpRequestor: can't find referenced class com.squareup.okhttp.Request$Builder
Warning:com.dropbox.core.http.OkHttpRequestor: can't find referenced class com.squareup.okhttp.Headers
Warning:com.dropbox.core.http.OkHttpRequestor: can't find referenced class com.squareup.okhttp.OkHttpClient
Warning:com.dropbox.core.http.OkHttpRequestor: can't find referenced class com.squareup.okhttp.Headers
Warning:com.dropbox.core.http.OkHttpRequestor$AsyncCallback: can't find referenced class com.squareup.okhttp.Callback
Warning:com.dropbox.core.http.OkHttpRequestor$AsyncCallback: can't find referenced class com.squareup.okhttp.Response
Warning:com.dropbox.core.http.OkHttpRequestor$AsyncCallback: can't find referenced class com.squareup.okhttp.Request
Warning:com.dropbox.core.http.OkHttpRequestor$AsyncCallback: can't find referenced class com.squareup.okhttp.Response
Warning:com.dropbox.core.http.OkHttpRequestor$BufferedUploader: can't find referenced class com.squareup.okhttp.Request$Builder
Warning:com.dropbox.core.http.OkHttpRequestor$BufferedUploader: can't find referenced class com.squareup.okhttp.OkHttpClient
Warning:com.dropbox.core.http.OkHttpRequestor$BufferedUploader: can't find referenced class com.squareup.okhttp.Call
Warning:com.dropbox.core.http.OkHttpRequestor$BufferedUploader: can't find referenced class com.squareup.okhttp.Request$Builder
Warning:com.dropbox.core.http.OkHttpRequestor$BufferedUploader: can't find referenced class com.squareup.okhttp.RequestBody
Warning:com.dropbox.core.http.OkHttpRequestor$BufferedUploader: can't find referenced class com.squareup.okhttp.Call
Warning:com.dropbox.core.http.OkHttpRequestor$BufferedUploader: can't find referenced class com.squareup.okhttp.Response
Warning:com.dropbox.core.http.OkHttpRequestor$BufferedUploader: can't find referenced class com.squareup.okhttp.ResponseBody
Warning:com.dropbox.core.http.OkHttpRequestor$BufferedUploader: can't find referenced class com.squareup.okhttp.Request$Builder
Warning:com.dropbox.core.http.OkHttpRequestor$BufferedUploader: can't find referenced class com.squareup.okhttp.Response
Warning:com.dropbox.core.http.OkHttpRequestor$BufferedUploader: can't find referenced class com.squareup.okhttp.OkHttpClient
Warning:com.dropbox.core.http.OkHttpRequestor$BufferedUploader: can't find referenced class com.squareup.okhttp.Call
Warning:com.dropbox.core.http.OkHttpRequestor$BufferedUploader: can't find referenced class com.squareup.okhttp.RequestBody
Warning:com.dropbox.core.http.OkHttpRequestor$BufferedUploader: can't find referenced class com.squareup.okhttp.Response
Warning:com.dropbox.core.http.OkHttpRequestor$BufferedUploader: can't find referenced class com.squareup.okhttp.ResponseBody
Warning:com.dropbox.core.http.OkHttpRequestor$BufferedUploader: can't find referenced class com.squareup.okhttp.Request
Warning:com.dropbox.core.http.OkHttpRequestor$BufferedUploader: can't find referenced class com.squareup.okhttp.Request$Builder
Warning:com.dropbox.core.http.OkHttpRequestor$BufferedUploader: can't find referenced class com.squareup.okhttp.RequestBody
Warning:com.dropbox.core.http.OkHttpRequestor$BufferedUploader: can't find referenced class com.squareup.okhttp.Call
Warning:com.dropbox.core.http.OkHttpRequestor$BufferedUploader: can't find referenced class com.squareup.okhttp.Request$Builder
Warning:com.dropbox.core.http.OkHttpRequestor$BufferedUploader: can't find referenced class com.squareup.okhttp.RequestBody
Warning:com.dropbox.core.http.OkHttpRequestor$BufferedUploader: can't find referenced class com.squareup.okhttp.Response
Warning:com.dropbox.core.http.OkHttpRequestor$PipedRequestBody: can't find referenced class com.squareup.okhttp.RequestBody
Warning:com.dropbox.core.http.OkHttpRequestor$PipedRequestBody: can't find referenced class com.squareup.okhttp.MediaType
Warning:com.dropbox.core.http.OkHttpRequestor$PipedRequestBody: can't find referenced class okio.BufferedSink
Warning:com.dropbox.core.http.OkHttpUtil$PipedStream: can't find referenced class okio.Okio
Warning:com.dropbox.core.http.OkHttpUtil$PipedStream: can't find referenced class okio.BufferedSink
Warning:com.dropbox.core.http.OkHttpUtil$PipedStream: can't find referenced class okio.Okio
Warning:com.dropbox.core.http.OkHttpUtil$PipedStream: can't find referenced class okio.BufferedSink
Warning:com.google.common.cache.Striped64: can't find referenced class sun.misc.Unsafe
Warning:com.google.common.cache.Striped64$1: can't find referenced class sun.misc.Unsafe
Warning:com.google.common.cache.Striped64$Cell: can't find referenced class sun.misc.Unsafe
Warning:com.google.common.primitives.UnsignedBytes$LexicographicalComparatorHolder$UnsafeComparator: can't find referenced class sun.misc.Unsafe
Warning:com.google.common.primitives.UnsignedBytes$LexicographicalComparatorHolder$UnsafeComparator$1: can't find referenced class sun.misc.Unsafe
Warning:com.squareup.picasso.OkHttpDownloader: can't find referenced class com.squareup.okhttp.OkHttpClient
Warning:com.squareup.picasso.OkHttpDownloader: can't find referenced class com.squareup.okhttp.Cache
Warning:com.squareup.picasso.OkHttpDownloader: can't find referenced class com.squareup.okhttp.OkHttpClient
Warning:com.squareup.picasso.OkHttpDownloader: can't find referenced class com.squareup.okhttp.CacheControl
Warning:com.squareup.picasso.OkHttpDownloader: can't find referenced class com.squareup.okhttp.CacheControl$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 355 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'.
> java.io.IOException: Please correct the above warnings first.

所以我在 progard-rules.pro 文件中添加了这些行：

-keep com.dropbox.** {*;}
-keep com.google.common.** {*;}
-keep com.square.picasso.** {*;}

然后，我得到这个错误：

Warning:Exception while processing task java.io.IOException: proguard.ParseException: Unexpected keyword 'com.dropbox.**' in line 18 of file '/home/AndroidProjects/Poolex/app/proguard-rules.pro'
Error:Execution failed for task ':app:transformClassesAndResourcesWithProguardForRelease'.
> java.io.IOException: proguard.ParseException: Unexpected keyword 'com.dropbox.**' in line 18 of file '/home/AndroidProjects/Poolex/app/proguard-rules.pro'

我该如何解决？

Answer 1

如果您愿意，您可以忽略 proguard 中的所有错误并尝试应用程序是否正常工作。我用这个
-dontwarn **
忽略所有错误。如果它不起作用，请尝试：
-keep **
如果您只想使用一个，请使用类似
-keep class com.dropbox.**
或
-ignore com.dropbox.**

Answer 2

添加到proguard-rules.pro这个：

-dontwarn okio.**
-dontwarn okhttp3.**
-dontwarn com.squareup.okhttp.**
-dontwarn com.google.appengine.**
-dontwarn javax.servlet.**
# Support classes for compatibility with older API versions
-dontwarn android.support.**
-dontnote android.support.**

确保您在build.gradle(Module:app) 中获得：

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

在android > buildTypes > release 块内。

Answer 3

试试这个：

-keep class com.dropbox.** {*;}
-keep class com.google.common.** {*;}
-keep class com.square.picasso.** {*;}