Android Studio 发布签名 apk :app:transformClassesAndResourcesWithProguardForRelease java. io.IOException

Question

我刚刚更新到 Android Studio 2.1.1，我正在尝试构建一个发布签名的 apk，但失败并出现以下错误。我该如何解决这个问题？

':app:transformClassesAndResourcesWithProguardForRelease'.
    > java.io.IOException: Please correct the above warnings first.

这是 build.gradle(模块:app)

完整版: https://gist.github.com/anonymous/65bb2edf94ea58c50de8e0ff107555ce

...
android {
    compileSdkVersion 23
    buildToolsVersion "23.0.2"

    defaultConfig {
        applicationId "com.company.project"
        minSdkVersion 15
        targetSdkVersion 23
        versionCode 13
        versionName "1.5"
    }
    buildTypes {
        release {
            minifyEnabled true
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
    lintOptions {
        checkReleaseBuilds false
    }
}

有关错误消息转储的更多信息
https://gist.github.com/anonymous/9d822c530011b48dab1da60267f9b471

更新:

proguard-rules.pro 的内容
https://gist.github.com/anonymous/9d822c530011b48dab1da60267f9b471

/Users/xxxx/Library/Android/sdk/tools/proguard/proguard-android.txt的内容
https://gist.github.com/anonymous/d5cdfbfd7c1bfe74d594993feb35bd62

/Users/xxxx/Library/Android/sdk/tools/proguard/proguard-project.txt的内容
https://gist.github.com/anonymous/d04cd0299029d4fdd648fb782f2e3021

Answer 1

由于您尚未在 proguard-android.txt 中添加保护规则文件我建议您添加所有必要的规则以从您的项目中发布 apk。

对于 retrofit您需要添加以下规则:

-dontwarn retrofit2.**
-keep class retrofit2.** { *; }
-keepattributes Signature
-keepattributes Exceptions

您还需要添加其他规则，例如，

-keepattributes *Annotation*
-keep class com.google.android.gms.internal.*

-keep public class * extends android.app.Activity
-keep public class * extends android.app.Application
-keep public class * extends android.app.Service
-keep public class * extends android.content.BroadcastReceiver
-keep public class * extends android.content.ContentProvider
-keep public class * extends android.app.backup.BackupAgent
-keep public class * extends android.preference.Preference
-keep public class * extends android.support.v4.app.Fragment
-keep public class * extends android.support.v4.app.DialogFragment

-keep class com.google.android.gms.maps.** { *; }
-keep interface com.google.android.gms.maps.** { *; }

-keepclassmembers class * implements android.os.Parcelable {
    static *** CREATOR;
}
# The Maps API uses serialization.
-keepclassmembers class * implements java.io.Serializable {
    static final long serialVersionUID;
    static final java.io.ObjectStreamField[] serialPersistentFields;
    private void writeObject(java.io.ObjectOutputStream);
    private void readObject(java.io.ObjectInputStream);
    java.lang.Object writeReplace();
    java.lang.Object readResolve();
}

这对于大多数项目都很常见，我已经用于我的项目，请在使用前检查整个规则。