传送门中文网地址https://reactnative.cn/

首先按照官网一步步配置好环境地址再这里https://reactnative.cn/docs/getting-started.html

将android/build.gradle中的jcenter()和google()分别替换为maven { url 'https://maven.aliyun.com/repository/jcenter' }和maven { url 'https://maven.aliyun.com/repository/google' }（注意有多处需要替换）。

遇到一些小坑：
坑1：:app:debugCompileClassPath报错

总感觉少了什么：于是照片查阅的资料在build.gradle中能加的都加上了就好了

// Top-level build file where you can add configuration options common to all sub-projects/modules.buildscript {ext {buildToolsVersion = "28.0.3"minSdkVersion = 16compileSdkVersion = 28targetSdkVersion = 28}repositories {google()jcenter()maven { url 'https://maven.aliyun.com/repository/google' }maven { url 'https://maven.aliyun.com/repository/jcenter' }}dependencies {classpath("com.android.tools.build:gradle:3.5.2")classpath 'com.google.gms:google-services:4.0.1'  //这行对谷歌服务库进行依赖// NOTE: Do not place your application dependencies here; they belong// in the individual module build.gradle files}
}allprojects {repositories {mavenLocal()maven {// All of React Native (JS, Obj-C sources, Android binaries) is installed from npmurl("$rootDir/../node_modules/react-native/android")}maven {// Android JSC is installed from npmurl("$rootDir/../node_modules/jsc-android/dist")}google()jcenter()maven { url 'https://maven.aliyun.com/repository/google' }maven { url 'https://maven.aliyun.com/repository/jcenter' }maven { url 'https://www.jitpack.io' }maven {url 'https://dl.bintray.com/jetbrains/anko'}maven {url "https://maven.google.com"}}
}task clean(type: Delete) {delete rootProject.buildDir
}

坑2：compileDebug not found。我是照着官网andstudio中先开了模拟器。。关掉就好了，yarn android的时候模拟器会自己开启。

坑3：unable to load script,make sure you are either running a Metro server。。。
我关掉了模拟器，重新yarn react-native start 执行了一次 重新yarn android就好了。

最后就就成功了！！！