今天在写项目的时候，项目中用到V4 中的Fragment compiler 的是V7，死活运行不成功，一直包这两个错误
Error:Execution failed for task ':app:transformClassesWithDexForDebug'. > com.android.build.api.transform.TransformException: com.android.ide.common.process.ProcessException: java.util.concurrent.ExecutionException: java.lang.UnsupportedOperationException Error:Execution failed for task ':app:transformClassesWithJarMergingForDebug'. > com.android.build.api.transform.TransformException: java.util.zip.ZipException: duplicate entry: android/support/v4/widget/CompoundButtonCompatLollipop.class在网上搜了各种资料都不行，折腾了半天，最后实在没办法了，将以前项目的Gradle文件拷贝了过来，最后可以运行了
apply plugin: 'com.android.application' android { compileSdkVersion 25 buildToolsVersion "25.0.3" defaultConfig { applicationId "lei.com.elm" minSdkVersion 19 targetSdkVersion 25 versionCode 1 versionName "1.0" testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner" } buildTypes { release { minifyEnabled false proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro' } } } dependencies { compile fileTree(include: ['*.jar'], dir: 'libs') androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', { exclude group: 'com.android.support', module: 'support-annotations' }) compile 'com.android.support:appcompat-v7:25.3.0' testCompile 'junit:junit:4.12' compile 'com.jakewharton:butterknife:8.6.0' annotationProcessor 'com.jakewharton:butterknife-compiler:8.6.0' compile 'com.android.support:design:25.3.0' }大家可以尝试将这个文件拷贝过去，AndroidStudiio提示下载什么就下载, 要注意修改applicationId。
