proguard.cfg 系统找不到指定的文件

解决方法：

　　方法一：在 \android-sdk-windows\tools\lib\目录下新建proguard.cfg文件 内容如下：

-optimizationpasses 5
-dontusemixedcaseclassnames
-dontskipnonpubliclibraryclasses
-dontpreverify
-verbose
-optimizations !code/simplification/arithmetic,!field/*,!class/merging/*
-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 com.android.vending.licensing.ILicensingService
-keepclasseswithmembernames class * {
native ;
}
-keepclasseswithmembernames class * {
public (android.content.Context, android.util.AttributeSet);
}
-keepclasseswithmembernames class * {
public (android.content.Context, android.util.AttributeSet, int);
}
-keepclassmembers enum * {
public static **[] values();
public static ** valueOf(java.lang.String);
}
-keep class * implements android.os.Parcelable {
public static final android.os.Parcelable$Creator *;
}

　　方法二：通过Android SDK and AVD Manager更新SDK。