Android代码混淆报错

代码混淆方法：
1.添加proguard-project.txt文件至app下目录
2.在该文件中添加要不混淆的代码，Gson、butterknife和eventbus等第三方包，除了将jar包中的包下类不混淆外，还有一些特殊的方法，也要保证不混淆，如下：

# To enable ProGuard in your project, edit project.properties# to define the proguard.config property as described in that file.## Add project specific ProGuard rules here.# By default, the flags in this file are appended to flags specified# in ${sdk.dir}/tools/proguard/proguard-android.txt# You can edit the include path and order by changing the ProGuard# include property in project.properties.## For more details, see#   http://developer.android.com/guide/developing/tools/proguard.html# Add any project specific keep options here:#先不混淆一些继承自带控件的view-keep public class * extends android.app.Fragment  -keep public class * extends android.app.backup.BackupAgentHelper-keep public class * extends android.preference.Preference-keep public class * extends android.support.v4.**-keep public class com.android.vending.licensing.ILicensingService-keep class com.kingnew.tian.model.** { *; }-keep class com.kingnew.tian.Cropcategorys.Model.** { *; }#-optimizationpasses 5          # 指定代码的压缩级别#-dontusemixedcaseclassnames   # 是否使用大小写混合#-keepattributes *Annotation*#-ignorewarnings                # 抑制警告#-dontskipnonpubliclibraryclasses       # 是否混淆第三方jar#不混淆Gson##---------------Begin: proguard configuration for Gson  ----------# Gson uses generic type information stored in a class file when working with fields. Proguard# removes such information by default, so configure it to keep all of it.-keepattributes Signature# Gson specific classes-keep class sun.misc.Unsafe { *; }#-keep class com.google.gson.stream.** { *; }# Application classes that will be serialized/deserialized over Gson-keep class com.google.gson.examples.android.model.** { *; }##---------------End: proguard configuration for Gson  ----------#不混淆butterknife##---------------Begin: proguard configuration for butterknife  -----------keep class butterknife.** { *; }-dontwarn butterknife.internal.**-keep class **$$ViewBinder { *; }-dontwarn butterknife.**-keepclasseswithmembernames class * {    @butterknife.* <fields>;}-keepclasseswithmembernames class * {    @butterknife.* <methods>;}##---------------End: proguard configuration for butterknife  ----------#不混淆eventbus##---------------Begin: proguard configuration for eventbus  -----------keep class org.greenrobot.eventbus.** { *; }-dontwarn org.greenrobot.eventbus.**-keepclassmembers class ** {    public void onEvent*(**);    void onEvent*(**);}##---------------Begin: proguard configuration for eventbus  ----------

3.在app的build文件中，将minifyEnabled 置为true

buildTypes {        release {            minifyEnabled true/*minifyEnabled主要用来控制是否运行混淆的。*/            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-project.txt'        }    }

4.然后在签名打包之后，保证app能够正常运行

ps:可参考该文：https://segmentfault.com/a/1190000002910305
5. 需要做混淆保护的内容
一般四大组件都会默认不被混淆

-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 

自定义组件的类也要设置为不被混淆，否则找不到控件

方案一、直接保护view的子类，因为自定义控件都是继承view

-keep public class * extends android.app.Dialog-keep public class * extends android.view

方案二、具体保护某个自定义控件

-keep public class com.viewpagerindicator.TitlePageIndicator

被调用的第三方jar包的类等

如果你使用了第三方的包，你需要使用一下配置，让ProGuard知道库中的一些类并不是在所有的API中可用：

-libraryjars   libs/roboguice-2.0.jar -dontwarn roboguice.**  

7.需要特别处理的第三方包

    GSON    butterknife    eventbus