如何解决：新建Android程序的时候发生了找不到/sdk/tools/lib/proguard.cfg文件的错误

方法一：
可在 /sdk/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 ;
}

-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：
从别人那里拷贝一份proguard.cfg文件。