Could not find com.android.tools.build:gradle:3.3.0.

导入新项目时报错：

Error:Could not find com.android.tools.build:gradle:3.3.0.
Searched in the following locations:
    file:/F:/Android/Android Studio/gradle/m2repository/com/android/tools/build/gradle/3.3.0/gradle-3.0.0.pom
    file:/F:/Android/Android Studio/gradle/m2repository/com/android/tools/build/gradle/3.3.0/gradle-3.0.0.jar
    https://jcenter.bintray.com/com/android/tools/build/gradle/3.3.0/gradle-3.0.0.pom
    https://jcenter.bintray.com/com/android/tools/build/gradle/3.3.0/gradle-3.3.0.jar
Required by:
    project :

解决办法:
在repositories{}内添加google()
它会去更换为https://dl.google.com/ 下载

buildscript {
    repositories {
        google()
        jcenter()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:3.3.0'

        // NOTE: Do not place your application dependencies here; they belong
        // in the individual module build.gradle files
    }
}

allprojects {
    repositories {
        google()
        mavenLocal()
        jcenter()
        maven {
            // All of React Native (JS, Obj-C sources, Android binaries) is installed from npm
            url "$rootDir/../node_modules/react-native/android"
        }
    }
}