AndroidStudio在编译时报错：

Could not find manifest-merger.jar (com.android.tools.build:manifest-merger:26.1.2).
Searched in the following locations:
    https://jcenter.bintray.com/com/android/tools/build/manifest-merger/26.1.2/manifest-merger-26.1.2.jar

在jcenter中找不到manifest-merger.jar包，看了一下我的根build.gradle文件，发现jcenter()在google()前面，它在jcenter中找不到manifest-merger.jar包就不会再去google中寻找了：

buildscript {
    repositories {
        jcenter()
        google()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:3.0.1'
    }
}

allprojects {
    repositories {
        jcenter()
        flatDir {
            dirs 'libs'
        }
        google()
    }
}

然后将google和jcenter换下位置，让它去google中下载manifest-merger.jar包，就可以编译通过了:

buildscript {
    repositories {
        google()
        jcenter()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:3.0.1'
    }
}

allprojects {
    repositories {
        google()
        jcenter()
        flatDir {
            dirs 'libs'
        }
    }
}