在NoClassDefFoundError中创建未签名的APK结果：无法解决以下问题：Lorg / apache / commons / codec / binary / Base64;

Question

我有一个奇怪的错误。我可以在调试中创建自己的构建，并且运行良好。所有的API都可以正常通信。明确的要求是，我需要向客户端的Playstore管理员提供未签名的APK版本，但是当我尝试构建未签名的应用程序时，出现以下错误：

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

<TextView
    android:id="@+id/textView1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="TextView1"
    app:layout_constraintTop_toTopOf="parent"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintEnd_toEndOf="parent" />

<TextView
    android:id="@+id/textView2"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="TextView2"
    app:layout_constraintTop_toBottomOf="@+id/textView1"
    app:layout_constraintStart_toStartOf="@id/textView1" />

<TextView
    android:id="@+id/textView3"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="TextView3"
    app:layout_constraintTop_toBottomOf="@+id/textView2"
    app:layout_constraintStart_toStartOf="@id/textView2" />
</android.support.constraint.ConstraintLayout>

但是仅当我创建未签名的APK时。未签名的APK的构建过程如何将无法获得所有必需的类？

我正在使用AndroidStudio 3.2.1，构建工具38.0.3和gradle-4.5

build.gradle

Caused by: java.lang.NoClassDefFoundError: Failed resolution of: Lorg/apache/commons/codec/binary/Base64;
    at org.apache.http.impl.auth.BasicScheme.authenticate(BasicScheme.java:166)
    at org.apache.http.client.protocol.RequestAuthenticationBase.authenticate(RequestAuthenticationBase.java:120)
    at org.apache.http.client.protocol.RequestAuthenticationBase.process(RequestAuthenticationBase.java:83)
    at org.apache.http.client.protocol.RequestTargetAuthentication.process(RequestTargetAuthentication.java:82)
    at org.apache.http.protocol.ImmutableHttpProcessor.process(ImmutableHttpProcessor.java:133)
    at org.apache.http.protocol.HttpRequestExecutor.preProcess(HttpRequestExecutor.java:167)
    at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:484)
    at org.apache.http.impl.client.AbstractHttpClient.doExecute(AbstractHttpClient.java:835)
    at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:83)
    at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:108)
    at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:56)
    at com.suddenlink.suddenlink2go.connection.UrlConnection.makeServiceCall(UrlConnection.java:300)
    at com.suddenlink.suddenlink2go.connection.UrlConnection.doInBackground(UrlConnection.java:486)
    at com.suddenlink.suddenlink2go.connection.UrlConnection.doInBackground(UrlConnection.java:71)
    at android.os.AsyncTask$2.call(AsyncTask.java:333)