修改project.properties文件

#proguard.config=${sdk.dir}/tools/proguard/proguard-android.txt:proguard-project.txt

去掉之前的#，即取消注释

修改proguard-project.txt文件（忽略第三方jar）

引入第三方库：

-libraryjars /libs/umeng_sdk.jar

忽略类：

-keep class com.umeng.** {*;}

-optimizationpasses 7
-dontskipnonpubliclibraryclasses
-dontskipnonpubliclibraryclassmembers
-dontpreverify
-verbose
-allowaccessmodification
-repackageclasses
-dontusemixedcaseclassnames
-dontoptimize

-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 * extends android.app.backup.BackupAgentHelper
-keep public class * extends android.preference.Preference
-keep public class com.android.vending.licensing.ILicensingService

-libraryjars /libs/umeng_sdk.jar

-keep class com.umeng.** {*;}

-keepclasseswithmembernames class * {
native ;
}

-keepclasseswithmembers class * {
public (android.content.Context, android.util.AttributeSet);
}

-keepclasseswithmembers class * {
public (android.content.Context, android.util.AttributeSet, int);
}

-keepclassmembers class * extends android.app.Activity {
public void *(android.view.View);
}

-keepclassmembers enum * {
public static **[] values();
public static ** valueOf(java.lang.String);
}

-keep class * implements android.os.Parcelable {
public static final android.os.Parcelable$Creator *;
}

配置好混淆，最后打包项目：