Android Robust Cannot cast object *** with class *** to class

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问题：

Cannot cast object 'com.android.build.gradle.internal.scope.BuildArtifactsHolder$FinalBuildableArtifact@7599177f'
 with class 'com.android.build.gradle.internal.scope.BuildArtifactsHolder$FinalBuildableArtifact'
  to class 'org.gradle.api.file.FileCollection'

***************** 12.26更新 ************************
添加签名后还是报错了，这次仔细排查了下，查看了详细的编译log，

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':robust:packageRelease'.
> Cannot cast object 'com.android.build.gradle.internal.scope.BuildArtifactsHolder$FinalBuildableArtifact@b88330b' with class 'com.android.build.gradle.internal.scope.BuildArtifactsHolder$FinalBuildableArtifact' to class 'org.gradle.api.file.FileCollection'

* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.

* Get more help at https://help.gradle.org

Deprecated Gradle features were used in this build, making it incompatible with Gradle 5.0.
See https://docs.gradle.org/4.6/userguide/command_line_interface.html#sec:command_line_warnings

BUILD FAILED in 2s

分析：
1. log中提示与Gradle5.0 不兼容
2. 重新编译了下，发现debug 可以顺利通过，release失败
3.Github:Robust 官方代码查看了下，用的是gradle 2.1编译的，官方说明是 “Gradle 2.10+ , include 3.0” ，而我本地的是gradle3.2.1

结果：
1. 不知道是不是分析3 中，本地gradle版本太高不兼容导致的

***************** 12.25更新（以下方法没用）***************
解决方案：
应用没有签名，添加签名即可

示例：
1.每次手动点击 build – generate signed bundle/apk
2.在app的build.gradle中配置下面

android {
    signingConfigs {
        main {
 			File key = new File("路径")   //如果是在根目录下，"../签名.jks"
           		 keyAlias "别名"
          		  keyPassword "密码"
         		   storeFile file(key)
          		  storePassword "密码"
              }
        }
  buildTypes {
        release {
            signingConfig signingConfigs.main
        }
        debug {
            signingConfig signingConfigs.main
        }
    }
}

Android Robust Cannot cast object * with class * to class

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