sdk下proguard.cfg文件找不到的解决办法

在sdk安装路径下的tools/lib下新建proguard.cfg文件，填写如下内容：

proguard.cfg-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 *;
}