java.io.IOException：Can't read [F:\..\android-support-v4.jar] (No such file or directory)

来自:http://stackoverflow.com/questions/26028171/android-studio-proguard-java-io-ioexception-bin-classes-no-such-file-or-d

操作：

在打包release模式的apk时，出现错误，但在debug中没有错误

错误信息：

Error:Execution failed for task ‘:artandroidclient:transformClassesAndResourcesWithProguardForRelease’.

java.io.IOException: Can’t read [F:\StudioProjects\artandroidclient\artandroidclient\libs\android-support-v4.jar] (No such file or directory)

详解：

The Android Gradle plugin already specifies all input and output for you, so you must not specify -injars, -outjars, or -libraryjars.

Moreover, the file proguard-android.txt in the Android SDK specifies all generic Android settings for you, so you shouldn’t specify them again.

Essentially, your file proguard-rules.txt can be empty, except for any application-specific settings to make sure any reflection continues to work.

如果遇到以下问题可能本质原因也是如此：

Error:Execution failed for task ‘:app:packageRelease’. > Unable to compute hash of /../AndroidStudioProjects/../classes.jar
Cannot make file java.io.IOException: No such file or directory
第一个问题，由于又重新引用android-support-v4.jar，但是没有这个jar文件，所以出错
第二个问题，因为在proguard-rules.txt/proguard-project.txt中读到下面这些，又去调用android-support-v4.jar，但是这些内容Android SDK已经帮我们做好了

解决方案：
我注释掉下面的代码在proguard-rules.txt/proguard-project.txt中，错误迎刃而解

 -libraryjars   libs/android-support-v4.jar

但是如果你在proguard-project.txt中，有以下语句也需要注释掉：

-injars bin/classes -injars libs -outjars bin/classes-processed.jar

下面这几行代码注释与否，不受影响：

 -dontwarn android.support.v4.** -keep class android.support.v4.** { *; } -keep interface android.support.v4.app.** { *; } -keep public class * extends android.support.v4.**

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