下午好，今天來看看我遇到的一個問題（錯誤如下）：

Error:Execution failed for task ':app:transformResourcesWithMergeJavaResForDebug'. > com.android.bui

Error:Execution failed for task ':app:transformResourcesWithMergeJavaResForDebug'.
> com.android.build.api.transform.TransformException: com.android.builder.packaging.DuplicateFileException: Duplicate files copied in APK META-INF/rxjava.properties
	File1: C:\Users\pc\.gradle\daemon\gradle-2.8\wrapper\dists\gradle-3.3-all\caches\modules-2\files-2.1\io.reactivex\rxjava\1.1.5\ece7b5d0870e66d8226dab6dcf47a2b12afff061\rxjava-1.1.5.jar
	File2: C:\Users\pc\.gradle\daemon\gradle-2.8\wrapper\dists\gradle-3.3-all\caches\modules-2\files-2.1\io.reactivex.rxjava2\rxjava\2.0.7\21734c0092a5d3c3ec99510e50c1ff76bdf0c65a\rxjava-2.0.7.jar
 

android {
    compileSdkVersion rootProject.ext.android["compileSdkVersion"]
    buildToolsVersion rootProject.ext.android["buildToolsVersion"]
    useLibrary 'org.apache.http.legacy'

    compileOptions {
        targetCompatibility JavaVersion.VERSION_1_8
        sourceCompatibility JavaVersion.VERSION_1_8
    }

    defaultConfig {
        applicationId "me.jessyan.mvparms.demo"
        minSdkVersion rootProject.ext.android["minSdkVersion"]
        targetSdkVersion rootProject.ext.android["targetSdkVersion"]
        versionCode rootProject.ext.android["versionCode"]
        versionName rootProject.ext.android["versionName"]
        testInstrumentationRunner rootProject.ext.dependencies["androidJUnitRunner"]
    }
    buildTypes {

        debug {
            buildConfigField "boolean", "LOG_DEBUG", "true"
            buildConfigField "boolean", "USE_CANARY", "true"
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }

        release {
            buildConfigField "boolean", "LOG_DEBUG", "false"
            buildConfigField "boolean", "USE_CANARY", "false"
            minifyEnabled true
            shrinkResources true
            zipAlignEnabled true
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
    packagingOptions{
        exclude 'META-INF/rxjava.properties'
        exclude 'META-INF/NOTICE' // will not include NOTICE file
        exclude 'META-INF/LICENSE' // will not include LICENSE file
        // as noted by @Vishnuvathsan you may also need to include
        // variations on the file name. It depends on your dependencies.
        // Some other common variations on notice and license file names
        exclude 'META-INF/notice'
        exclude 'META-INF/notice.txt'
        exclude 'META-INF/license'
        exclude 'META-INF/license.txt'
    }

    lintOptions {
        disable 'InvalidPackage'
        disable "ResourceType"
        abortOnError false
    }
}

buildscript {
    repositories {
        jcenter()
    }
}


dependencies {
    compile fileTree(include: ['*.jar'], dir: 'libs')
    //support
    compile(rootProject.ext.dependencies["cardview-v7"]) {
        exclude module: 'support-annotations'
    }
    //tools
    annotationProcessor rootProject.ext.dependencies["dagger2-compiler"]
    compile rootProject.ext.dependencies["progressmanager"]
    compile rootProject.ext.dependencies["retrofit-url-manager"]

    provided rootProject.ext.dependencies["javax.annotation"]//dagger2必須依賴jsr250 annotation

    //view
    annotationProcessor(rootProject.ext.dependencies["butterknife-compiler"]) {
        exclude module: 'support-annotations'
        exclude module: 'butterknife-annotations'
    }
    compile rootProject.ext.dependencies["paginate"]
    //arms
    compile project(':arms')
    //    compile 'me.jessyan:arms:2.2.3'
    //test
    testCompile rootProject.ext.dependencies["junit"]
    debugCompile rootProject.ext.dependencies["canary-debug"]
    releaseCompile rootProject.ext.dependencies["canary-release"]
    testCompile rootProject.ext.dependencies["canary-release"]
    compile 'com.android.support.constraint:constraint-layout:1.0.2'
    compile 'com.android.support:recyclerview-v7:26.0.0-alpha1'

    compile 'com.google.code.gson:gson:2.3'
    compile 'com.squareup.retrofit:retrofit:2.0.0-beta1'
    compile 'com.squareup.retrofit:converter-gson:2.0.0-beta2'
    compile 'com.squareup.okhttp:okhttp:2.4.0'

    compile 'com.squareup.retrofit:retrofit:2.0.0-beta2'
    compile 'com.squareup.retrofit:adapter-rxjava:2.0.0-beta2'
//    compile 'io.reactivex:rxjava:1.1.0'
    compile 'io.reactivex:rxandroid:1.1.0'
    compile 'com.squareup.retrofit2:adapter-rxjava:2.0.2'
    compile 'com.squareup.retrofit2:converter-scalars:2.1.0'
    compile 'com.squareup.retrofit2:retrofit:2.1.0'
    compile 'com.squareup.retrofit2:converter-gson:2.1.0'
}
 

 packagingOptions{
        exclude 'META-INF/rxjava.properties'
        exclude 'META-INF/NOTICE' // will not include NOTICE file
        exclude 'META-INF/LICENSE' // will not include LICENSE file
        // as noted by @Vishnuvathsan you may also need to include
        // variations on the file name. It depends on your dependencies.
        // Some other common variations on notice and license file names
        exclude 'META-INF/notice'
        exclude 'META-INF/notice.txt'
        exclude 'META-INF/license'
        exclude 'META-INF/license.txt'
    }
 

我的錯誤是匯入了兩個rxjava的不同版本的包導致的，因為IDE好像無法從兩個包裡去選擇一個來用，從而導致了依賴包的衝突，所以除了rxjava的衝突還有可能在我們導依賴包的時候出現其他的包的衝突，這都要在packagingOptions裡新增對應的過濾，新增這句是用來濾檔案配置的，我的錯誤解決是新增下面一句rxjava的過濾程式碼：

exclude 'META-INF/rxjava.properties'