Apk文件被反編譯出來能被獲取到里面的代碼。對于這種情況，我們可以對項目代碼進行混淆，隨機生成難理解的類名，方法名，讓代碼難以閱讀，加大功能被盜取的難度?；煜梢云鸬綁嚎sApk，混淆文件，預檢，優化的作用。
1. 使用方式，在gradle文件中設置minifyEnabled為true即可開啟混淆
buildTypes { release { minifyEnabled ture //是否開啟代碼混淆 proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro' } }混淆內容在proguard-android.txt文件中寫。
2. 混淆設置參數
-optimizationpasses 4 代碼混淆的壓縮比例，值介于0-7
-dontusemixedcaseclassnames 混淆后類型都為小寫
-dontskipnonpubliclibraryclasses 不去忽略非公共的庫類
-dontoptimize 不優化輸入的類文件
-dontpreverify 不做預校驗的操作
-ignorewarnings 忽略警告
-verbose 混淆時是否記錄日志
-keepattributes Annotation 保護注解
-printmapping proguardMapping.txt 生成原類名和混淆后的類名的映射文件
-optimizations !code/simplification/cast,!field/ ,!class/merging/ 指定混淆是采用的算法
3. 保持不被混淆的設置
保持實體類不混淆
-keep class 你的實體類所在的包.** { *; }
保持四大組件，Application，Fragment不混淆
-keep public class * extends android.app.Application-keep public class * extends android.app.Activity-keep public class * extends android.app.Fragment-keep public class * extends android.support.v4.app.Fragment-keep public class * extends android.app.Fragment-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.preference.Preference
保持 native 方法不被混淆
-keepclasseswithmembernames class * { native <methods>;}保持枚舉enum類不被混淆
-keepclassmembers enum * { public static **[] values(); public static ** valueOf(java.lang.String);}保持 Parcelable 不被混淆
-keep class * implements android.os.Parcelable { public static final android.os.Parcelable$Creator *;}保持第三方包不混淆，比如這里用到微信、支付寶支付第三方
#支付寶混淆-keep class com.alipay.android.app.IAlixPay{*;}-keep class com.alipay.android.app.IAlixPay$Stub{*;}-keep class com.alipay.android.app.IRemoteServiceCallback{*;}-keep class com.alipay.android.app.IRemoteServiceCallback$Stub{*;}-keep class com.alipay.sdk.app.PayTask{ public *;}-keep class com.alipay.sdk.app.AuthTask{ public *;}#微信支付混淆-keep class com.tencent.mm.opensdk.** {*;}-keep class com.tencent.wxop.** {*;}-keep class com.tencent.mm.sdk.** {*;}4. 完整混淆示例：
#指定代碼的壓縮級別-optimizationpasses 5#包名不混合大小寫-dontusemixedcaseclassnames#不去忽略非公共的庫類-dontskipnonpubliclibraryclasses #優化 不優化輸入的類文件-dontoptimize #預校驗-dontpreverify #混淆時是否記錄日志-verbose#忽略警告-ignorewarning#保護注解-keepattributes *Annotation*-keep public class * extends android.app.Application-keep public class * extends android.app.Activity-keep public class * extends android.app.Fragment-keep public class * extends android.support.v4.app.Fragment-keep public class * extends android.app.Fragment-keep public class * extends android.app.Service-keep public class * extends android.content.BroadcastReceiver-keep public class * extends android.content.ContentProvider-keep public class * extends android.preference.Preference-keepclasseswithmembernames class * { native <methods>;}-keepclassmembers class * extends android.app.Activity { public void *(android.view.View);}-keepclassmembers enum * { public static **[] values(); public static ** valueOf(java.lang.String);}-keep class * implements android.os.Parcelable { public static final android.os.Parcelable$Creator *;}-keepclassmembers class **.R$* { *;}-keep class * extends android.view.View{*;}-keep class * extends android.app.Dialog{*;}-keep class * implements java.io.Serializable{*;}#butterknife-keep class butterknife.** { *; }-dontwarn butterknife.internal.**-keep class **$$ViewBinder { *; }#volley-dontwarn com.android.volley.**-keep class com.android.volley.**{*;}#fastjson-dontwarn com.alibaba.fastjson.**-keep class com.alibaba.fastjson.**{*;}#happy-dns-dontwarn com.qiniu.android.dns.**-keep class com.qiniu.android.dns.**{*;}#okhttp-dontwarn com.squareup.okhttp.**-keep class com.squareup.okhttp.**{*;}-keep class okio.**{*;}-keep class android.net.**{*;}-keep class com.android.internal.http.multipart.**{*;}-keep class org.apache.**{*;}-keep class com.qiniu.android.**{*;}-keep class android.support.annotation.**{*;}-keep class com.squareup.wire.**{*;}-keep class com.ant.liao.**{*;}#騰訊-keep class com.tencent.**{*;}-keep class u.aly.**{*;}#ImageLoader-keep class com.nostra13.universalimageloader.**{*;}#友盟-dontwarn com.umeng.**-keep class com.umeng.**{*;}#pulltorefresh-keep class com.handmark.pulltorefresh.** { *; }-keep class android.support.v4.** { *;}-keep public class * extends android.support.v4.**{ public protected *;}-keep class android.support.v7.** {*;}自己試著用一個簡單的項目加入混淆，打個包試試效果吧。
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