使用Gradle和ProGuard进行Android构build:“输出jar必须在inputjar之后指定,否则将为空”

我正在用Gradle创build一个不同风格的版本。 直到现在,它一直运行得非常好,直到我想启用Proguard 。 我为我的发布版本启用了minifyEnabled ,现在我有一个exception说:

Caused by: org.gradle.internal.UncheckedException: java.io.IOException: The output jar [.../app/build/intermediates/multi-dex/dev/release/componentClasses.jar] must be specified after an input jar, or it will be empty.

有谁知道是什么原因造成这个exception? 我基本上想在释放我的应用程序之前启用ProGuard。 下面是我的Gradle文件。

 lintOptions { abortOnError false } dexOptions{ incremental true javaMaxHeapSize "4g" } defaultConfig { applicationId "..." minSdkVersion 14 targetSdkVersion 22 versionCode 1 versionName "1.0" multiDexEnabled true } buildTypes { release { minifyEnabled true proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro' signingConfig signingConfigs.release } debug { minifyEnabled false shrinkResources false proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro' signingConfig signingConfigs.debug } } 

ProGuard规则文件。

 # Add project specific ProGuard rules here. # By default, the flags in this file are appended to flags specified # in /Users/osayilgan/Development/Android/sdk/tools/proguard/proguard-android.txt # You can edit the include path and order by changing the proguardFiles # directive in build.gradle. # # For more details, see # http://developer.android.com/guide/developing/tools/proguard.html # Add any project specific keep options here: # If your project uses WebView with JS, uncomment the following # and specify the fully qualified class name to the JavaScript interface # class: #-keepclassmembers class fqcn.of.javascript.interface.for.webview { # public *; #} -keepnames public class * extends io.realm.RealmObject -keep class io.realm.** { *; } -dontwarn javax.** -dontwarn io.realm.** 

这里是proguard-android文件。 这是Android SDK的默认设置。

 # This is a configuration file for ProGuard. # http://proguard.sourceforge.net/index.html#manual/usage.html -dontusemixedcaseclassnames -dontskipnonpubliclibraryclasses -verbose # Optimization is turned off by default. Dex does not like code run # through the ProGuard optimize and preverify steps (and performs some # of these optimizations on its own). -dontoptimize -dontpreverify # Note that if you want to enable optimization, you cannot just # include optimization flags in your own project configuration file; # instead you will need to point to the # "proguard-android-optimize.txt" file instead of this one from your # project.properties file. -keepattributes *Annotation* -keep public class com.google.vending.licensing.ILicensingService -keep public class com.android.vending.licensing.ILicensingService # For native methods, see http://proguard.sourceforge.net/manual/examples.html#native -keepclasseswithmembernames class * { native <methods>; } # keep setters in Views so that animations can still work. # see http://proguard.sourceforge.net/manual/examples.html#beans -keepclassmembers public class * extends android.view.View { void set*(***); *** get*(); } # We want to keep methods in Activity that could be used in the XML attribute onClick -keepclassmembers class * extends android.app.Activity { public void *(android.view.View); } # For enumeration classes, see http://proguard.sourceforge.net/manual/examples.html#enumerations -keepclassmembers enum * { public static **[] values(); public static ** valueOf(java.lang.String); } -keep class * implements android.os.Parcelable { public static final android.os.Parcelable$Creator *; } -keepclassmembers class **.R$* { public static <fields>; } # The support library contains references to newer platform versions. # Don't warn about those in case this app is linking against an older # platform version. We know about them, and they are safe. -dontwarn android.support.** 

Solutions Collecting From Web of "使用Gradle和ProGuard进行Android构build:“输出jar必须在inputjar之后指定,否则将为空”"

我花了一段时间才弄清楚,但正如我所猜测的,这一切都是关于Proguard的configuration。

我开始挖掘控制台中的警告,并意识到Proguard找不到一些参考资料。 因此,将它们作为-dontwarn添加到proguardconfiguration文件解决了这个问题。

就我而言,我不得不忽视下面的包。

 -dontwarn java.lang.invoke** -dontwarn org.apache.lang.** -dontwarn org.apache.commons.** -dontwarn com.nhaarman.** -dontwarn se.emilsjolander.**