1.去网站搜索你需要依赖的gradle引用地址

JCenter

https://bintray.com/bintray/jcenter

MavenCenter

http://mvnrepository.com/

2.更改项目build.gradle JCenter/mavenCentral

repositories {
    jcenter()
}

dependencies {
    compile fileTree(dir: 'libs',include: ['*.jar'])
    testCompile 'junit:junit:4.12'
    compile 'com.android.support:appcompat-v7:23.1.0'
    compile 'com.facebook.fresco:fresco:0.9.0'
}