init

.gitignore

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+*.iml
+.gradle
+/local.properties
+/.idea
+.DS_Store
+/build
+/captures
+.externalNativeBuild

README.md

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+相关文章链接：[MainDex 优化记](https://mp.weixin.qq.com/s?__biz=MzUyMDg2ODgwOQ==&mid=2247483679&idx=1&sn=4520ae38f703ee3b2303c02b47a80639&chksm=f9e287b9ce950eafa38deb9d8bf898a3abcaa0234adcc08ad017d8fd89bfc612a8d6e6a1cefe&token=1165484979&lang=zh_CN#rd)
+
+### 原理
+
+此插件只作用于打包过程，编码过程无感知、无影响。
+
+混淆之后将会产生一个包含应用中所有 class 的 jar，通过 ASM 扫描所有的类、类的方法、类的字段等一切可能会出现注解的地方，扫描到开发者配置的注解则将其删除；而如果当前类是注解类且是开发者所配置的类的话，该注解类将会被删除。
+
+### 配置
+
+thinAnnotation 默认删除**所有**的 SOURCE 时期注解，因为使用 SOURCE 时期注解的地方实际上会在 .java -> .class 过程中被擦除，所以所有的 SOURCE 注解类实际上都是无用类，例如 `android/support/design/widget/TabLayout$Mode` 类；thinAnnotation 默认删除了 `butterknife/` 包、 `android/support/annotation/` 包、`androidx/annotation/` 包的所有注解，原因是这些 CLASS 时期的类在运行时是无用的（除非特殊要求，CLASS 文件实际上也是可以全部删除的）；开发者只需要配置想要删除的 CLASS 和 RUNTIME 时期的注解类，配置方式如下——
+
+在 project/build.gradle 中：
+
+```
+buildscript {
+  repositories {
+    maven { url 'https://jitpack.io' }
+  }
+  dependencies {
+    classpath 'com.github.jokermonn:thinAnnotation:0.0.2'
+  }
+}
+```
+
+在 app/build.gradle 中：
+
+```
+apply plugin: 'thinAnnotation'
+
+thinAnnotation {
+  // 是否开启插件
+  enable true
+  // 目标注解类的路径
+  shrinkClass = ['com/joker/maindexkeep/annotations/RuntimeAnn', 'com/joker/maindexkeep/annotations/Type']
+  // 目标包的路径
+  shrinkPackage = ['com/joker/maindexkeep/shrink']
+}
+```
+
+日志在：`app/build/outputs/thinAnnotation` 路径下。
+
+## 示例
+
+以 butterknife 为例：
+
+使用前：butterknife 包注解类存在，`@BindView` 等注解存在于 .class 文件中
+
+![](http://imglf6.nosdn0.126.net/img/UnlRcDgySWkxbnZUbjBCSXdnUFoza3RCR0R1TGY0M0x6dkxwQksxaFdJS3FJUHhmT2FCK21RPT0.png?imageView&thumbnail=2490y1632&type=png&quality=96&stripmeta=0)
+
+使用后：butterknife 包注解类全部删除，所有使用该注解的地方也都会被清除注解
+
+![](http://imglf5.nosdn0.126.net/img/UnlRcDgySWkxbnZUbjBCSXdnUFozanN2dzFqaU4xREZZalNtc2JrSGw0WXNQWEQ5NlpQNUlnPT0.png?imageView&thumbnail=2238y1484&type=png&quality=96&stripmeta=0)

app/.gitignore

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+/build

app/build.gradle

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+apply plugin: 'com.android.application'
+apply plugin: 'com.getkeepsafe.dexcount'
+apply plugin: 'thinAnnotation'
+
+android {
+  compileSdkVersion 28
+
+  defaultConfig {
+    applicationId "com.joker.maindexkeep"
+    minSdkVersion 14
+    targetSdkVersion 28
+    versionCode 1
+    versionName "1.0"
+
+    multiDexEnabled true
+    multiDexKeepProguard file('./maindex-rules.pro')
+    multiDexKeepFile file('./maindex-keep.txt')
+  }
+
+  buildTypes {
+    release {
+      minifyEnabled true
+      proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
+    }
+  }
+
+  dexOptions {
+    //    keepRuntimeAnnotatedClasses false
+  }
+}
+
+thinAnnotation {
+  enable = true
+  shrinkClass = ['com/joker/maindexkeep/annotations/RuntimeAnn']
+  shrinkPackage = ['com/joker/maindexkeep/shrink']
+}
+
+dependencies {
+  implementation fileTree(dir: 'libs')
+  implementation 'com.squareup.wire:wire-runtime:2.2.0'
+  implementation 'com.google.code.gson:gson:2.8.5'
+  implementation 'com.android.support:appcompat-v7:28.0.0'
+  implementation 'com.android.support.constraint:constraint-layout:1.1.3'
+  implementation 'com.android.support:multidex:1.0.3'
+  implementation 'com.google.guava:guava:27.0.1-android'
+  implementation "io.reactivex.rxjava2:rxjava:2.2.6"
+  implementation 'com.squareup.retrofit2:retrofit:2.4.0'
+  implementation 'com.squareup.okhttp3:okhttp:3.12.1'
+  implementation 'com.squareup.okhttp3:logging-interceptor:3.8.0'
+  implementation 'com.jakewharton.retrofit:retrofit2-rxjava2-adapter:1.0.0'
+  implementation 'com.squareup.retrofit2:converter-gson:2.4.0'
+  implementation 'io.reactivex.rxjava2:rxandroid:2.1.0'
+  implementation 'com.jakewharton.rxbinding2:rxbinding:2.1.1'
+  implementation 'com.android.support:exifinterface:28.0.0'
+  implementation 'com.github.bumptech.glide:glide:4.8.0'
+  implementation 'com.miguelcatalan:materialsearchview:1.0.1'
+  implementation 'com.sdsmdg.harjot:vectormaster:1.0.5'
+  implementation 'com.amap.api:3dmap:5.7.0'
+  implementation 'com.amap.api:location:3.5.0'
+  implementation 'com.amap.api:search:5.7.0'
+  implementation 'com.xyz.step:step:1.0.4'
+  implementation 'com.rengwuxian.materialedittext:library:2.1.4'
+  implementation 'info.hoang8f:fbutton:1.0.5'
+  implementation 'me.drakeet.materialdialog:library:1.3.1'
+  implementation 'com.daimajia.swipelayout:library:1.2.0@aar'
+  implementation 'com.squareup.leakcanary:leakcanary-android:1.6.1'
+  implementation 'com.android.support:cardview-v7:28.0.0'
+  implementation 'com.android.support:support-v4:28.0.0'
+  implementation 'com.android.support:appcompat-v7:28.0.0'
+  implementation 'com.android.support:design:28.0.0'
+  implementation 'com.facebook.fresco:fresco:1.11.0'
+  implementation 'com.facebook.fresco:animated-gif:1.11.0'
+  implementation 'com.facebook.fresco:animated-webp:1.11.0'
+  implementation 'com.facebook.fresco:webpsupport:1.11.0'
+  implementation 'com.facebook.fresco:webpsupport:1.11.0'
+  implementation 'com.android.support:preference-v7:28.0.0'
+  implementation 'com.jakewharton:butterknife:8.4.0'
+  annotationProcessor 'com.jakewharton:butterknife-compiler:8.4.0'
+}

app/maindex-rules.pro

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+#-keep class com.joker.maindexkeep.model.AppReferencerence {
+#  public void test();
+#}

app/proguard-rules.pro

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+# Add project specific ProGuard rules here.
+# You can control the set of applied configuration files using the
+# proguardFiles setting in build.gradle.
+#
+# For more details, see
+#   http://developer.android.com/guide/developing/tools/proguard.html
+
+# If your project uses WebView with JS, uncomment the following
+# and specify the fully qualified class name to the JavaScript interface
+# class:
+#-keepclassmembers class fqcn.of.javascript.interface.for.webview {
+#   public *;
+#}
+
+# Uncomment this to preserve the line number information for
+# debugging stack traces.
+#-keepattributes SourceFile,LineNumberTable
+
+# If you keep the line number information, uncomment this to
+# hide the original source file name.
+#-renamesourcefileattribute SourceFile
+-dontshrink # 为了超过 66536
+-dontusemixedcaseclassnames
+-dontskipnonpubliclibraryclasses
+-verbose
+-dontpreverify
+-dontoptimize
+-dontwarn
+-keepnames class okhttp3.internal.publicsuffix.PublicSuffixDatabase
+-dontwarn org.codehaus.mojo.animal_sniffer.*
+-dontwarn okhttp3.internal.platform.ConscryptPlatform
+-keepattributes Signature, InnerClasses, EnclosingMethod, *Annotation*
+-keepclassmembers,allowshrinking,allowobfuscation interface * {
+    @retrofit2.http.* <methods>;
+}
+-dontwarn org.codehaus.mojo.animal_sniffer.IgnoreJRERequirement
+-dontwarn javax.annotation.**
+-dontwarn kotlin.Unit
+-dontwarn retrofit2.-KotlinExtensions
+-keep class sun.misc.Unsafe { *; }
+-dontwarn java.nio.file.*
+-dontwarn org.codehaus.mojo.animal_sniffer.IgnoreJRERequirement
+-dontwarn okio.**
+-keep class com.google.common.io.Resources {
+    public static <methods>;
+}
+-keep class com.google.common.collect.Lists {
+    public static ** reverse(**);
+}
+-keep class com.google.common.base.Charsets {
+    public static <fields>;
+}
+
+-keep class com.google.common.base.Joiner {
+    public static com.google.common.base.Joiner on(java.lang.String);
+    public ** join(...);
+}
+
+-keep class com.google.common.collect.MapMakerInternalMap$ReferenceEntry
+-keep class com.google.common.cache.LocalCache$ReferenceEntry
+-dontwarn javax.annotation.**
+-dontwarn javax.inject.**
+-dontwarn sun.misc.Unsafe
+-dontwarn java.lang.ClassValue
+-dontwarn com.google.j2objc.annotations.Weak
+-dontwarn org.codehaus.mojo.animal_sniffer.IgnoreJRERequirement
+-dontwarn javax.lang.model.element.Modifier
+
+-keep,allowobfuscation @interface com.facebook.common.internal.DoNotStrip
+
+-keep @com.facebook.common.internal.DoNotStrip class *
+-keepclassmembers class * {
+    @com.facebook.common.internal.DoNotStrip *;
+}
+-keepclassmembers class * {
+    native <methods>;
+}
+-dontwarn okio.**
+-dontwarn javax.annotation.**
+-dontwarn com.android.volley.toolbox.**
+
+# app
+-keep class com.joker.maindexkeep.model.AppReference {
+  public void test();
+}

app/src/main/AndroidManifest.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools"
+    package="com.joker.maindexkeep">
+
+  <uses-sdk tools:overrideLibrary="com.miguelcatalan.materialsearchview, com.sdsmdg.harjot.vectormaster"/>
+
+  <application
+      android:allowBackup="true"
+      android:icon="@mipmap/ic_launcher"
+      android:label="@string/app_name"
+      android:name=".App"
+      android:roundIcon="@mipmap/ic_launcher_round"
+      android:supportsRtl="true"
+      android:theme="@style/AppTheme">
+    <!-- 添加了 process 属性所以将会被 keep 住 -->
+    <service
+        android:enabled="true"
+        android:exported="true"
+        android:name=".MultiProcessService"
+        android:process="t:second">
+    </service>
+
+    <activity android:name=".MainActivity">
+      <intent-filter>
+        <action android:name="android.intent.action.MAIN"/>
+
+        <category android:name="android.intent.category.LAUNCHER"/>
+      </intent-filter>
+    </activity>
+    <activity android:name=".SecondActivity"/>
+  </application>
+
+</manifest>

app/src/main/java/com/joker/maindexkeep/App.java

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+package com.joker.maindexkeep;
+
+import android.content.Context;
+import android.support.multidex.MultiDex;
+import android.support.multidex.MultiDexApplication;
+import android.util.Log;
+import com.joker.maindexkeep.model.AppReference;
+
+public class App extends MultiDexApplication {
+  @Override protected void attachBaseContext(Context base) {
+    super.attachBaseContext(base);
+    AppReference useless = new AppReference();
+  }
+
+  @Override public void onCreate() {
+    MultiDex.install(this);
+    super.onCreate();
+  }
+}

app/src/main/java/com/joker/maindexkeep/MainActivity.java

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+package com.joker.maindexkeep;
+
+import android.support.v7.app.AppCompatActivity;
+import android.os.Bundle;
+import com.joker.maindexkeep.annotations.RuntimeAnn;
+
+/**
+ * 方法/类被运行时注解所修饰，所以当前类将会被打入 maindex
+ */
+@RuntimeAnn
+public class MainActivity extends AppCompatActivity {
+
+  @Override
+  protected void onCreate(Bundle savedInstanceState) {
+    super.onCreate(savedInstanceState);
+    setContentView(R.layout.activity_main);
+  }
+
+  @RuntimeAnn
+  void test() {
+
+  }
+}

app/src/main/java/com/joker/maindexkeep/MultiProcessService.java

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+package com.joker.maindexkeep;
+
+import android.app.Service;
+import android.content.Intent;
+import android.os.IBinder;
+
+/**
+ * manifest 中有注释
+ */
+public class MultiProcessService extends Service {
+  public MultiProcessService() {
+  }
+
+  @Override
+  public IBinder onBind(Intent intent) {
+    // TODO: Return the communication channel to the service.
+    throw new UnsupportedOperationException("Not yet implemented");
+  }
+}

app/src/main/java/com/joker/maindexkeep/SecondActivity.java

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+package com.joker.maindexkeep;
+
+import android.support.v7.app.AppCompatActivity;
+import android.os.Bundle;
+import android.widget.TextView;
+import butterknife.BindView;
+import com.joker.maindexkeep.annotations.RuntimeAnn;
+
+/**
+ * {@link BindView} 是运行时注解，所以当前类将会被打入 maindex
+ */
+public class SecondActivity extends AppCompatActivity {
+
+  @BindView(R.id.tv) TextView tv;
+
+  @Override @RuntimeAnn
+  protected void onCreate(Bundle savedInstanceState) {
+    super.onCreate(savedInstanceState);
+    setContentView(R.layout.activity_second);
+  }
+}

app/src/main/java/com/joker/maindexkeep/annotations/AnnotationWrapper.java

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+package com.joker.maindexkeep.annotations;
+
+import android.support.annotation.StringDef;
+import com.joker.maindexkeep.model.AnnotationWrapperReference;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+
+import static com.joker.maindexkeep.annotations.AnnotationWrapper.Nothing.A;
+import static com.joker.maindexkeep.annotations.AnnotationWrapper.Nothing.B;
+
+/**
+ * 由于包含注解内部类，所以本身及本身引用的 {@link AnnotationWrapperReference}及 {@link AnnotationWrapperReference}
+ * 的引用类都将会被打入 maindex
+ */
+public class AnnotationWrapper {
+
+  public void test() {
+    AnnotationWrapperReference reference = new AnnotationWrapperReference();
+  }
+
+  @Retention(RetentionPolicy.SOURCE)
+  @StringDef({ A, B })
+  public @interface Nothing {
+    String A = "a";
+    String B = "b";
+  }
+}

app/src/main/java/com/joker/maindexkeep/annotations/ClassAnn.java

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+package com.joker.maindexkeep.annotations;
+
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+@Retention(RetentionPolicy.CLASS)
+@Target({ ElementType.METHOD })
+public @interface ClassAnn {
+}