混淆（把程式碼縮小了，比如類名改成a，b）

• 開啟壓縮選項

• 在module的build.gradle中新增

  buildTypes {
        release {
            minifyEnabled true
            //proguard（保護一些不能改的檔案 配置）
            //proguard-android.txt是系統自帶的不要混淆的檔案（比如四大元件的名字不能混淆，要不清單檔案找不到會無法初始化）
            //proguard-rules.pro自定義的不要混淆的（因為一些三方的庫已經做過了混淆，不能再混淆了）
 

            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
        debug {
            minifyEnabled true
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'

        }
    }

• 配置自己的檔案不能混淆（防止反射根據類名，欄位名找不到檔案）
  • 示例

# 高德地圖
-dontwarn com.amap.api.**
-dontwarn com.a.a.**
-dontwarn com.autonavi.**
-keep class com.amap.api.**  {*;}
-keep class com.autonavi.**  {*;}
-keep class com.a.a.**  {*;}

-dontwarn com.loc.**
-keep class com.loc.**  {*;}

# 支付寶
-dontwarn com.alipay.android.app.**
-keep class com.alipay.android.
 
app.** {*;}
# 友盟
-dontwarn com.umeng.**
-keep class com.umeng.** { *;}
-keepclassmembers class * {    public <init>(org.json.JSONObject); }
-keep public class com.hyx.maizuo.main.R$*{     public static final int *; }
-keep public class com.umeng.fb.ui.ThreadView { }
# Mob
-dontwarn com.mob.**
-keep class com.mob.**  {*;}


# OkHttp3
-dontwarn okhttp3.logging.**
-keep class okhttp3.internal.**{*;}
-dontwarn okio.**
# Retrofit
-dontwarn retrofit2.**
-keep class retrofit2.** { *; }

# butterknife
-keep class butterknife.** { *; }
-dontwarn butterknife.internal.**
-keep class **$$ViewInjector { *; }

-keepclasseswithmembernames class * {   @butterknife.* <fields>;  }
-keepclasseswithmembernames class * {   @butterknife.* <methods>;  }

# ormlite
-dontwarn com.j256.**
-keep class com.j256.** { *; }
-keep enum com.j256.** { *; }
-keep interface com.j256.** { *; }

-keep class com.xjd.takeout.model.dao.bean.** { *; }

# 不混淆 com.squareup.picasso
-keepattributes SourceFile,LineNumberTable
-keep class com.parse.*{ *; }
-dontwarn com.parse.**
-dontwarn com.squareup.picasso.**
-keepclasseswithmembernames class * {native <methods>;}

##---------------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

# For using GSON @Expose annotation
-keepattributes *Annotation*

# 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.xjd.takeout.model.net.bean.** { *; }

##---------------End: proguard configuration for Gson  ----------

刪除無用資源

• 刪除無用的語言檔案
• png(帶了透明度)圖片轉換成jpg圖片