详解android项目由Gradle 2.2 切换到 3.0的坑

问题1、运行的时候一直报如下错误

Error:Execution failed for task ':app:transformDexArchiveWithExternalLibsDexMergerForApiTestDebug'. 
> java.lang.RuntimeException: com.android.builder.dexing.DexArchiveMergerException: Unable to merge dex 

查了很多资料，大概意识是引用重复的库或jar的问题。

然后一遍一遍的检查，发现并没有引用重复的jar包。

最后考虑是不是第三方库引用jar出现的问题，然后就一个一个排查第三方库，最后发现我们用支付用的是

compile 'com.pingxx:pingpp-alipay:2.1.9' // 使用支付宝时添加

发现这个库有些问题，竟然在里面引用两个版本的支付宝的jar包，果断的换了最新版本，检查了一个这次就引用了一个jar包。重新编译了一下项目，运行成功，问题解决了。

特别注意：引用第三方库在gralde3.0版本是更为严格，要特别注意。

问题2、

AAPT2

AAPT2 将默认启用，如果遇到离奇的问题，可以尝试禁用，只要在 gradle.properties 中加入：

android.enableAapt2=false

其他：

应用（app）目录下build.gradle（下面 implementation "com.android.support:design:25.4.0" 切换为 project的统一配置）

apply plugin: 'com.android.application' 
apply plugin: 'io.fabric' 
apply plugin: 'com.google.gms.google-services' 
   android { 
    compileSdkVersion 25 
    buildToolsVersion "26.0.2" 
 
    defaultConfig { 
      multiDexEnabled true 
      applicationId "com.example" 
      minSdkVersion 21 
      targetSdkVersion 23 
      versionCode 1 
      versionName "1.0" 
 
      renderscriptTargetApi 23 
      renderscriptSupportModeEnabled true 
 
    } 
    compileOptions { 
      sourceCompatibility JavaVersion.VERSION_1_8 
      targetCompatibility JavaVersion.VERSION_1_8 
    } 
    lintOptions { 
      quiet true 
      abortOnError false 
      ignoreWarnings true 
      disable 'InvalidPackage'      //Some libraries have issues with this. 
      disable 'OldTargetApi' 
      //Lint gives this warning but SDK 20 would be Android L Beta. 
      disable 'IconDensities'      //For testing purpose. This is safe to remove. 
      disable 'IconMissingDensityFolder' //For testing purpose. This is safe to remove. 
    } 
 
 
    dexOptions { 
      javaMaxHeapSize "8G" 
    } 
 
    packagingOptions { 
      exclude 'LICENSE.txt' 
      exclude 'META-INF/DEPENDENCIES.txt' 
      exclude 'META-INF/LICENSE.txt' 
      exclude 'META-INF/NOTICE.txt' 
      exclude 'META-INF/NOTICE' 
      exclude 'META-INF/LICENSE' 
      exclude 'META-INF/DEPENDENCIES' 
      exclude 'META-INF/notice.txt' 
      exclude 'META-INF/license.txt' 
      exclude 'META-INF/dependencies.txt' 
      exclude 'META-INF/rxjava.properties' 
    } 
 
    sourceSets { 
      main.java.srcDirs += 'build/generated/source/apt' 
    } 
  } 
 
  repositories { 
    flatDir { 
      dirs 'libs' 
    } 
  } 
 
  dependencies { 
  implementation fileTree(dir: 'libs', include: ['*.jar'])  
  implementation project(':library_api') 
  implementation project(':library_base') 
  implementation project(':library_blur_dialog') 
  implementation project(':library_countrycodepicker_dialog') 
  implementation project(':library_glow_decorator') 
  implementation project(':library_icons') 
  implementation project(':library_loopvideo') 
  implementation project(':library_section_adaper') 
  implementation project(':library_taptargetview') 
  implementation project(':library_ucrop') 
  implementation project(':library_utils') 
  implementation project(':library_utils_picasso') 
  implementation project(':library_vector_compat') 
  implementation project(':library_view_clock') 
  implementation project(':library_view_shimmer_recycler') 
 
  implementation "com.google.android.gms:play-services-cast-framework:11.4.2" 
  compileOnly 'com.google.android.wearable:wearable:2.0.3' 
  implementation 'com.google.android.support:wearable:2.0.3' 
  implementation 'com.google.android.exoplayer:exoplayer:r2.4.1' 
 
  implementation "com.android.support:mediarouter-v7:25.4.0" 
  implementation "com.android.support:leanback-v17:25.4.0" 
  implementation "com.android.support:design:25.4.0" 
 
  implementation "com.android.support:appcompat-v7:25.4.0" 
  implementation "com.android.support:support-v4:25.4.0" 
  implementation "com.android.support:gridlayout-v7:25.4.0" 
  implementation "com.android.support:cardview-v7:25.4.0" 
  implementation "com.android.support:recyclerview-v7:25.4.0" 
  implementation "com.android.support:preference-v14:25.4.0" 
 
  // rxjava 
  implementation 'io.reactivex:rxjava:1.2.9' 
  implementation 'io.reactivex:rxandroid:1.2.1' 
  implementation 'com.github.davidmoten:rxjava-extras:0.8.0.6' 
 
  // square 
  implementation "com.squareup.retrofit2:retrofit:2.1.0", 
  implementation "com.squareup.retrofit2:converter-gson:2.1.0" 
  implementation "com.squareup.retrofit2:adapter-rxjava:2.1.0" 
  implementation "com.squareup.phrase:phrase:1.1.0" 
 
  implementation "com.squareup.okhttp3:okhttp:3.6.0" 
  implementation "com.squareup.okhttp3:logging-interceptor:3.6.0" 
  implementation "com.squareup.okhttp3:okhttp-urlconnection:3.6.0" 
 
  // picasso 
  implementation "com.squareup.picasso:picasso:2.5.2" 
  implementation 'com.jakewharton.picasso:picasso2-okhttp3-downloader:1.1.0' 
 
  // dagger 
  implementation "com.google.dagger:dagger:2.10" 
  annotationProcessor "com.google.dagger:dagger-compiler:2.10" 
  implementation "javax.annotation:jsr250-api:1.0" 
  implementation "javax.inject:javax.inject:1" 

  // jake ftw 
  implementation 'com.jakewharton:butterknife:8.8.1' 
  annotationProcessor 'com.jakewharton:butterknife-compiler:8.8.1'  
  compileOnly 'org.projectlombok:lombok:1.16.16' 
  annotationProcessor 'org.projectlombok:lombok:1.16.16'  
  // FragmentWithArgs 
  implementation  "com.hannesdorfmann.fragmentargs:annotation:3.0.2", 
  annotationProcessor "com.hannesdorfmann.fragmentargs:processor:3.0.2",  
  implementation "org.parceler:parceler-api:1.1.9", 
  annotationProcessor "org.parceler:parceler:1.1.9", 
  implementation 'com.hannesdorfmann.fragmentargs:bundler-parceler:3.0.2' 
   implementation "com.github.codekidX:storage-chooser:1.0.34"  
  implementation 'io.github.yavski:fab-speed-dial:1.0.6'  
  implementation('com.crashlytics.sdk.android:crashlytics:2.6.7@aar') { 
    transitive = true; 
  } 
 
  // intent builder 
  implementation     "com.github.marcinmoskala.activitystarter:activitystarter:1.00" 
  annotationProcessor "com.github.marcinmoskala.activitystarter:activitystarter-compiler:1.00"  
  implementation 'com.android.support.constraint:constraint-layout:1.0.2'//constraint-layout 
  implementation 'org.greenrobot:eventbus:3.0.0' 
  //font 
  implementation 'uk.co.chrisjenx:calligraphy:2.2.0' 
  implementation 'com.github.florent37:expectanim:1.0.6' 
  implementation 'com.romandanylyk:pageindicatorview:0.2.0@aar' 
  implementation 'com.github.rubensousa:gravitysnaphelper:1.2' 
  implementation 'com.flaviofaria:kenburnsview:1.0.7' 
  implementation 'com.github.florent37:arclayout:1.0.2'  
  implementation 'com.jakewharton.rxbinding:rxbinding:1.0.1' 
  implementation 'com.wang.avi:library:2.1.3' 
  implementation 'com.flyco.tablayout:FlycoTabLayout_Lib:2.1.2@aar' 
  implementation 'com.borax12.materialdaterangepicker:library:1.9' 
  implementation 'com.github.scottyab:showhidepasswordedittext:0.8' 
  //Location 
  implementation "com.google.android.gms:play-services-maps:11.4.2" 
  implementation 'pl.charmas.android:android-reactive-location:0.10@aar' 
  implementation "com.google.android.gms:play-services-location:11.4.2" 
  //you can use newer GMS version if you need 
  implementation "com.google.android.gms:play-services-places:11.4.2" 
  implementation 'com.tbruyelle.rxpermissions:rxpermissions:0.9.4@aar' 
  implementation 'commons-validator:commons-validator:1.4.1' 
  implementation 'com.balysv:material-ripple:1.0.2' 
  implementation 'com.googlecode.libphonenumber:libphonenumber:8.5.2' 
  implementation 'ru.egslava:MaskedEditText:1.0.5' 
  implementation 'com.futuremind.recyclerfastscroll:fastscroll:0.2.5'  
  implementation "com.google.firebase:firebase-core:11.4.2" 
  implementation 'com.labo.kaji:swipeawaydialog:0.1.1' 
  implementation 'io.supercharge:shimmerlayout:1.0.1' 
  implementation 'hanks.xyz:htextview-library:0.1.5' 
  implementation 'com.github.castorflex.smoothprogressbar:library:1.1.0'//progressbar for action bar 
  implementation 'io.reactivex:rxjava-math:1.0.0' 
  implementation 'jp.wasabeef:picasso-transformations:2.1.2' 
  implementation 'com.afollestad.material-dialogs:core:0.9.1.0' 
  implementation('com.github.ihsanbal:LoggingInterceptor:2.0.2') { 
    exclude group: 'org.json', module: 'json' 
  }  
} 

项目（project）目录下build.gradle：

// Top-level build file where you can add configuration options common to all sub-projects/modules. 
 
buildscript { 
  repositories { 
    maven { url 'http://maven.aliyun.com/nexus/content/groups/public/' } 
    maven { 
      url 'https://maven.google.com/' 
      name 'Google' 
    } 
    jcenter() 
//    maven { url 'http://maven.aliyun.com/nexus/content/repositories/jcenter' } 
  } 
  dependencies { 
    classpath 'com.android.tools.build:gradle:3.0.1' 
    classpath 'com.meituan.android.walle:plugin:1.1.1' 
    // NOTE: Do not place your application dependencies here; they belong 
    // in the individual module build.gradle files 
  } 
} 
 
allprojects { 
  repositories { 
    maven { url 'http://maven.aliyun.com/nexus/content/groups/public/' } 
//    maven { url 'http://maven.aliyun.com/nexus/content/repositories/jcenter' } 
    maven { url "https://jitpack.io" } 
    maven { url 'https://maven.google.com' } 
    maven { url "https://dl.google.com/dl/android/maven2/"} 
    jcenter() 
    google() 
  } 
} 
 
task clean(type: Delete) { 
  delete rootProject.buildDir 
} 
 
 
ext { 
  targetSdkVersion = 26 
  minSdkVersion = 14 
  compileSdk = 26 
  buildTools = "26.0.2" 
  junit = 'junit:junit:4.12' 
  recyclerview = 'com.android.support:recyclerview-v7:26.0.2' 
  appcompat = 'com.android.support:appcompat-v7:26.0.2' 
  design = 'com.android.support:design:26.0.2' 
  percent = 'com.android.support:percent:26.0.2' 
  glide = 'com.github.bumptech.glide:glide:3.7.0' 
  retrofit = 'com.squareup.retrofit:retrofit:1.9.0' 
  gson = 'com.google.code.gson:gson:2.8.0' 
  okhttp = 'com.squareup.okhttp3:okhttp:3.6.0' 
//  converterGson = 'com.squareup.retrofit:converter-gson:2.0.0-beta2' 
//  converterJackson = 'com.squareup.retrofit:converter-jackson:1.9.0' 
   
  commonsio = 'commons-io:commons-io:2.4' 
} 

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