一、问题1

Android studio打包中遇到了这样的问题：

1	Warning:Exception while processing task java.io.IOException: The same input jar […….jar] is specified twice.

解决办法

打开proguard-rules.pro，
注释掉所有的-libraryjars行，或者直接删除，如：

1	#-libraryjars xxxx.jar

原因分析

build.gradle文件配置了

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dependencies {
    compile fileTree(include: '*.jar', dir: 'libs')
}

里面已经添加过jar包，sdk 通过 proguard 混淆代码时默认已经将 lib目录中的 jar 都已经添加到打包脚本中，所以不需要再次手动添加。

二、问题2

Warning:okio.DeflaterSink: can't find referenced class org.codehaus.mojo.animal_sniffer.IgnoreJRERequirement
Warning:okio.Okio: can't find referenced class java.nio.file.Files
Warning:okio.Okio: can't find referenced class java.nio.file.Path
Warning:okio.Okio: can't find referenced class java.nio.file.OpenOption

Warning:Exception while processing task java.io.IOException: Please correct the above warnings first.
:app:transformClassesAndResourcesWithProguardForRelease FAILED
Error:Execution failed for task ':app:transformClassesAndResourcesWithProguardForRelease'.
> java.io.IOException: Please correct the above warnings first.

解决办法

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# okio
-dontwarn okio.**
-keep class okio.** {*;}

三、问题3

Warning:library class android.content.res.XmlResourceParser extends or implements program class org.xmlpull.v1.XmlPullParser
Note: android.support.v4.text.ICUCompatApi23: can't find dynamically referenced class libcore.icu.ICU
Note: android.support.v4.text.ICUCompatIcs: can't find dynamically referenced class libcore.icu.ICU
Note: android.support.v7.internal.widget.DrawableUtils: can't find dynamically referenced class android.graphics.Insets
Note: com.loc.ce: can't find dynamically referenced class android.telephony.MSimTelephonyManager
Note: com.loc.ce: can't find dynamically referenced class android.telephony.TelephonyManager2
Note: com.spd.sinoss.zxing.camera.FlashlightManager: can't find dynamically referenced class android.os.ServiceManager
Note: com.spd.sinoss.zxing.camera.FlashlightManager: can't find dynamically referenced class android.os.IHardwareService$Stub
Note: org.kobjects.util.ChainedRuntimeException: can't find dynamically referenced class org.kobjects.util.ChainedRuntimeExceptionSE
Note: u.aly.ab: can't find dynamically referenced class com.ut.device.UTDevice
Note: u.aly.ac: can't find dynamically referenced class android.os.SystemProperties
Warning:library class android.content.Intent depends on program class org.xmlpull.v1.XmlPullParser
Warning:library class android.content.IntentFilter depends on program class org.xmlpull.v1.XmlSerializer
Warning:library class android.content.IntentFilter depends on program class org.xmlpull.v1.XmlPullParser
Warning:library class android.content.res.ColorStateList depends on program class org.xmlpull.v1.XmlPullParser
Warning:library class android.graphics.drawable.AnimationDrawable depends on program class org.xmlpull.v1.XmlPullParser
Warning:library class android.graphics.drawable.BitmapDrawable depends on program class org.xmlpull.v1.XmlPullParser
Warning:library class android.graphics.drawable.ClipDrawable depends on program class org.xmlpull.v1.XmlPullParser
Warning:library class android.graphics.drawable.ColorDrawable depends on program class org.xmlpull.v1.XmlPullParser
Warning:library class android.graphics.drawable.Drawable depends on program class org.xmlpull.v1.XmlPullParser
Warning:library class android.graphics.drawable.GradientDrawable depends on program class org.xmlpull.v1.XmlPullParser
Warning:library class android.graphics.drawable.InsetDrawable depends on program class org.xmlpull.v1.XmlPullParser
Warning:library class android.graphics.drawable.LayerDrawable depends on program class org.xmlpull.v1.XmlPullParser
Warning:library class android.graphics.drawable.NinePatchDrawable depends on program class org.xmlpull.v1.XmlPullParser
Warning:library class android.graphics.drawable.ShapeDrawable depends on program class org.xmlpull.v1.XmlPullParser
Warning:library class android.util.Xml depends on program class org.xmlpull.v1.XmlPullParser
Warning:library class android.util.Xml depends on program class org.xmlpull.v1.XmlSerializer
Warning:library class android.util.Xml depends on program class org.xmlpull.v1.XmlPullParser
Warning:library class android.view.LayoutInflater depends on program class org.xmlpull.v1.XmlPullParser