这可能是sdk更新不完全造成的,需要重新手动更新一下。
1、Eclipse--->Window--->Android SDK And AVD Manager(或者直接在Android解压目录底下运行SDK Setup.exe)
2、选择installed packages,在右边列表中选择SDK tools ,点击 update all
等待更新完毕就OK了!
原因:
SDK不完整。
解决方法:
方法一
可在 /android-sdk-windows/tools/lib/目录下新建一个proguard.cfg文件
然后添下以下内容:

-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 <methods>;
}
-keepclasseswithmembernames class * {
public <init>(android.content.Context, android.util.AttributeSet);
}
-keepclasseswithmembernames class * {
public <init>(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更新所有SDK。