分类目录归档:Android

React Native初试:Windows下Andriod环境搭建

  最近想写个App,又觉得Native App 太无趣了Web App又没那么成熟然后发现了Facebook在9月发布的React Native比较新奇,所以决定捣鼓看看;
  React Native为Facebook开源的使用Javascript与React开发Android、IOS原生跨平台App,React也是Factbook开源的JS框架使用了虚拟DOM的概念,Factbook自己的应用如Groups也是基于React Native在国内也有淘宝iPad版本是哟个了React Native;
  React Native最早支持的是Mac,for Android windows的支持9月份才刚发布还存在不少坑;

基本环境安装

  开发Android App当然首先要安装:JDK、Android SDK配置好JDk、SDK环境变量;
  安装C++编译环境(可以选择Visual Studio 或mingw等),编译nodejs的C++模块会使用;
  安装git、安装Node.js环境;

React-Native 安装

  如果没有VPN最好设置npm镜像不然及其考验你的耐性

npm config set registry https://registry.npm.taobao.org

安装 React-Native

npm install -g react-native-cli

创建项目

进入你希望项目存放的工作目录,运行

react-native init HelloWorld  

项目生成

请耐性等待,第一次下载依赖会比较久;

运行packager

npm start或react-native start  

npm start

  查看 http://localhost:8081/index.android.bundle?platform=android 是否能打开;
  启动模拟器,运行adb devices查看是否设备已连接上;
保持packager开启,另外打开一个命令行窗口,然后在工程目录下运行

运行React Native

react-native run-android

react-native run-android  

异常

A problem occurred configuring project ':app'.
> Could not resolve all dependencies for configuration ':app:_debugCompile'.
> Could not find com.android.support:appcompat-v7:23.1.1.

解决方案:安装Android Support Repository与Android Support Library

如没有VPN要耐性等待,gradle下载一些依赖。

运行成功
sucessApp

生成APK

进入项目目录进入Android目录,在命令行运行:

gradlew assembleRelease  

在React-native 0.14.2版本的时候会存在两个坑,应该算是Bug;
在https://github.com/danhanfry/react-native-windows-apk发现了解决方案;

坑 1:

> A problem occurred starting process 'command 'react-native''    

解决方案:进入项目目录》android目录》app目录打开react.gradle文件
在文件头加入:import org.apache.tools.ant.taskdefs.condition.Os
找到

commandLine "react-native", "bundle", "--platform", "android", "--dev", "true", "--entry-file",
        entryFile, "--bundle-output", jsBundleFileDebug, "--assets-dest", resourcesDirDebug    

修改为:

 if (Os.isFamily(Os.FAMILY_WINDOWS)) {
        commandLine "cmd", "/c", "react-native", "bundle", "--platform", "android", "--dev", "true", "--entry-file",
            entryFile, "--bundle-output", jsBundleFileDebug, "--assets-dest", resourcesDirDebug
} else {
    commandLine "react-native", "bundle", "--platform", "android", "--dev", "true", "--entry-file",
            entryFile, "--bundle-output", jsBundleFileDebug, "--assets-dest", resourcesDirDebug
}  

找到:

commandLine "react-native", "bundle", "--platform", "android", "--dev", "false", "--entry-file",  
        entryFile, "--bundle-output", jsBundleFileRelease, "--assets-dest", resourcesDirRelease  

修改为:

if (Os.isFamily(Os.FAMILY_WINDOWS)) {
    commandLine "cmd","/c", "react-native", "bundle", "--platform", "android", "--dev", "false", "--entry-file",
            entryFile, "--bundle-output", jsBundleFileRelease, "--assets-dest", resourcesDirRelease
} else {
    commandLine "react-native", "bundle", "--platform", "android", "--dev", "false", "--entry-file",
            entryFile, "--bundle-output", jsBundleFileRelease, "--assets-dest", resourcesDirRelease
}  

坑2:

Execution failed for task ':app:bundleReleaseJsAndAssets'.  
> Process 'command 'cmd'' finished with non-zero exit value 1  

解决方案:
在HelloWorld\node_modules\react-native\packager\react-packager\src\SocketInterface目录找到index.js文件在40行左右把:

const sockPath = path.join(
tmpdir,
'react-packager-' + hash.digest('hex')
 );  

修改为:

let sockPath = path.join(
tmpdir,
'react-packager-' + hash.digest('hex')
);
if (process.platform==='win32'){
sockPath = sockPath.replace(/^\//, '')
sockPath = sockPath.replace(/\//g, '-')
sockPath = '\\\\.\\pipe\\' + sockPath
}  

生成apk
生成成功后就可以在:android\app\build\outputs\apk目录下看到生成的apk;