新建的项目报Failed to resolve: com.android.support:appcompat-v7:27.+
通过查询网路资料解决办法
apply plugin: 'com.android.application' android { compileSdkVersion 23 //SDK版本要修改为本地已经下载的
buildToolsVersion "25.0.0" //与SDK Manager中有的版本
defaultConfig { applicationId "com.news" minSdkVersion 18 targetSdkVersion 23 //与上面的compileSdkVersion 保持一致 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(dir: 'libs', include: ['*.jar']) androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', { exclude group: 'com.android.support', module: 'support-annotations' }) compile 'com.android.support:appcompat-v7:23.+' //将V7的版本降低 compile 'com.android.support.constraint:constraint-layout:1.0.2' testCompile 'junit:junit:4.12' }