Lỗi bảo vệ trong khi tạo APK đã ký

Question

Tôi đã đặt minifyEnabled thành true trong tệp build.gradle của mình. tôi nhận được rất nhiều lỗi trong khi tạo ra một APK ký hợp đồng với ứng dụng của tôi:

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. 

Vì vậy, tôi đã thêm những dòng này trong file progard-rules.pro:

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

Nhưng sau đó, tôi nhận được này lỗi:

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' 

Làm cách nào để giải quyết vấn đề này?

Answer 1

Nếu bạn muốn, bạn có thể bỏ qua tất cả lỗi từ Proguard và thử nếu các công trình ứng dụng. Tôi sử dụng số điện thoại này
-dontwarn **
để bỏ qua tất cả các lỗi. Nếu nó không hoạt động, hãy thử với:
-keep **
Và nếu bạn muốn làm điều đó chỉ với một, sử dụng như
-keep class com.dropbox.**
hoặc
-ignore com.dropbox.**

Answer 2

Hãy thử điều này:

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

Answer 3

Thêm vào proguard-rules.pro này:

-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.** 

Đảm bảo trong build.gradle(Module:app) bạn nhận được:

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

trong số android>buildTypes>release khối.