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：

 1 -optimizationpasses 5
 2 -dontusemixedcaseclassnames
 3 -dontskipnonpubliclibraryclasses
 4 -dontpreverify
 5 -verbose
 6 -optimizations !code/simplification/arithmetic,!field/*,!class/merging/*
 7 -keep public class * extends android.app.Activity
 8 -keep public class * extends android.app.Application
 9 -keep public class * extends android.app.Service
10 -keep public class * extends android.content.BroadcastReceiver
11 -keep public class * extends android.content.ContentProvider
12 -keep public class com.android.vending.licensing.ILicensingService
13 -keepclasseswithmembernames class * {
14 native ;
15 }
16 -keepclasseswithmembernames class * {
17 public (android.content.Context, android.util.AttributeSet);
18 }
19 -keepclasseswithmembernames class * {
20 public (android.content.Context, android.util.AttributeSet, int);
21 }
22 -keepclassmembers enum * {
23 public static **[] values();
24 public static ** valueOf(java.lang.String);
25 }
26 -keep class * implements android.os.Parcelable {
27 public static final android.os.Parcelable$Creator *;
28 }

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