署名付きAPKを生成すると、問題が発生しました。

Question

署名付きAPKを生成したいと思い、「com.squareup.okhttp3：okhttp：3.8.1」をコンパイルしました。
しかし、問題が発生しました。それは "okhttp"問題のように見えます。 解決方法がわかりません。私は多くの情報を研究していますが、これについての情報はめったにないようです。

メッセージ：

Information:Gradle tasks [:app:assembleFreeRelease] 
Warning:okhttp3.Address: can't find referenced class javax.annotation.Nullable 
Warning:okhttp3.Authenticator: can't find referenced class javax.annotation.Nullable 
Warning:okhttp3.Cache: can't find referenced class javax.annotation.Nullable 
Warning:okhttp3.Cache$2: can't find referenced class javax.annotation.Nullable 
Warning:okhttp3.Cache$CacheResponseBody: can't find referenced class javax.annotation.Nullable 
Warning:okhttp3.Cache$Entry: can't find referenced class javax.annotation.Nullable 
Warning:okhttp3.CacheControl: can't find referenced class javax.annotation.Nullable 
Warning:okhttp3.CertificatePinner: can't find referenced class javax.annotation.Nullable 
Warning:okhttp3.Challenge: can't find referenced class javax.annotation.Nullable 
Warning:okhttp3.Connection: can't find referenced class javax.annotation.Nullable 
Warning:okhttp3.ConnectionPool: can't find referenced class javax.annotation.Nullable 
Warning:okhttp3.ConnectionSpec: can't find referenced class javax.annotation.Nullable 
Warning:okhttp3.ConnectionSpec$Builder: can't find referenced class javax.annotation.Nullable 
Warning:okhttp3.Cookie: can't find referenced class javax.annotation.Nullable 
Warning:okhttp3.Dispatcher: can't find referenced class javax.annotation.Nullable 
Warning:okhttp3.FormBody: can't find referenced class javax.annotation.Nullable 
Warning:okhttp3.Handshake: can't find referenced class javax.annotation.Nullable 
Warning:okhttp3.Headers: can't find referenced class javax.annotation.Nullable 
Warning:okhttp3.HttpUrl: can't find referenced class javax.annotation.Nullable 
Warning:okhttp3.HttpUrl$Builder: can't find referenced class javax.annotation.Nullable 
Warning:okhttp3.Interceptor$Chain: can't find referenced class javax.annotation.Nullable 
Warning:okhttp3.MediaType: can't find referenced class javax.annotation.Nullable 
Warning:okhttp3.MultipartBody: can't find referenced class javax.annotation.Nullable 
Warning:okhttp3.MultipartBody$Builder: can't find referenced class javax.annotation.Nullable 
Warning:okhttp3.MultipartBody$Part: can't find referenced class javax.annotation.Nullable 
Warning:okhttp3.OkHttpClient: can't find referenced class javax.annotation.Nullable 
Warning:okhttp3.OkHttpClient$Builder: can't find referenced class javax.annotation.Nullable 
Warning:okhttp3.Request: can't find referenced class javax.annotation.Nullable 
Warning:okhttp3.Request$Builder: can't find referenced class javax.annotation.Nullable 
Warning:okhttp3.RequestBody: can't find referenced class javax.annotation.Nullable 
Warning:okhttp3.RequestBody$1: can't find referenced class javax.annotation.Nullable 
Warning:okhttp3.RequestBody$2: can't find referenced class javax.annotation.Nullable 
Warning:okhttp3.RequestBody$3: can't find referenced class javax.annotation.Nullable 
Warning:okhttp3.Response: can't find referenced class javax.annotation.Nullable 
Warning:okhttp3.Response$Builder: can't find referenced class javax.annotation.Nullable 
Warning:okhttp3.ResponseBody: can't find referenced class javax.annotation.Nullable 
Warning:okhttp3.ResponseBody$1: can't find referenced class javax.annotation.Nullable 
Warning:okhttp3.Route: can't find referenced class javax.annotation.Nullable 
Warning:okhttp3.WebSocket: can't find referenced class javax.annotation.Nullable 
Warning:okhttp3.internal.cache.CacheStrategy: can't find referenced class javax.annotation.Nullable 
Warning:okhttp3.internal.cache.DiskLruCache: can't find referenced class javax.annotation.Nullable 
Warning:okhttp3.internal.cache.DiskLruCache$Snapshot: can't find referenced class javax.annotation.Nullable 
Warning:okhttp3.internal.connection.RealConnection: can't find referenced class javax.annotation.Nullable 
Warning:okhttp3.package-info: can't find referenced class javax.annotation.ParametersAreNonnullByDefault 
Warning:okio.AsyncTimeout: can't find referenced class javax.annotation.Nullable 
Warning:okio.Buffer: can't find referenced class javax.annotation.Nullable 
Warning:okio.BufferedSource: can't find referenced class javax.annotation.Nullable 
Warning:okio.ByteString: can't find referenced class javax.annotation.Nullable 
Warning:okio.DeflaterSink: can't find referenced class org.codehaus.mojo.animal_sniffer.IgnoreJRERequirement 
Warning:okio.HashingSink: can't find referenced class javax.annotation.Nullable 
Warning:okio.Okio: can't find referenced class org.codehaus.mojo.animal_sniffer.IgnoreJRERequirement 
Warning:okio.Okio$4: can't find referenced class javax.annotation.Nullable 
Warning:okio.RealBufferedSource: can't find referenced class javax.annotation.Nullable 
Warning:okio.Segment: can't find referenced class javax.annotation.Nullable 
Warning:okio.SegmentPool: can't find referenced class javax.annotation.Nullable 
Warning:okio.package-info: can't find referenced class javax.annotation.ParametersAreNonnullByDefault 
Warning:there were 169 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:transformClassesAndResourcesWithProguardForFreeRelease'. Job failed, see logs for details 
Information:BUILD FAILED 
Information:Total time: 9.693 secs 
Information:1 error 
Information:58 warnings 
Information:See complete output in console 

どのように私はこの問題を解決できますか？

Answer 1

あなたはProGuardのファイルにこれらの行を追加する必要があります

-dontwarn okio.** 
-dontwarn javax.annotation.Nullable 
-dontwarn javax.annotation.ParametersAreNonnullByDefault 

Answer 2

それはProGuardのルールを適用しているので、minifyEnabledがあなたのbuild.gradle でtrueに設定されているように見えます。あなたは、あなたのbuild.gradleファイルをチェックし、パラメータminifyEnabledはあなたのコードを難読化しないために、falseに設定されていることを確認し、あなたのコードを難読化していることを

-dontwarn okio.** 
-dontwarn com.squareup.okhttp3.** 
-keep class com.squareup.okhttp3.** { *; } 
-keep interface com.squareup.okhttp3.** { *; } 
-dontwarn javax.annotation.Nullable 
-dontwarn javax.annotation.ParametersAreNonnullByDefault 

Answer 3

可能なあなたのproguard-rules.proファイルにこのルールを追加する必要があります

が、それは次のようになります。

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

コンパイルをし、問題が解決されているかどうか確認して、あなたは、Androidのコードの難読化についてもっと知りたい場合はコメント。