我相信很多人对React Native现在终于支持Android也很兴奋.
但它不支持在Windows机器上开发，这将让人大失所望——在许多情况下，这将阻止大型公司采用React Native，而这些公司不能仅仅改变其主要操作系统.
我挖了一点，不管怎样，要在Windows上运行似乎并不难.
在react-native-cliindex.js中从spawn更改为requirejs.exec，如下所示:
spawn.exec(cmd + ' ' + args.join(' '), function(code, output){
if (code !== 0) {
cb(new Error('Command exited with a non-zero status ' + code + '\n' + cmd + ' ' + args.replace(',', ' ')));
} else {
cb(null);
}
});
//var proc = spawn(cmd, args, {stdio: 'inherit'});
//proc.on('close', function(code) {
// if (code !== 0) {
// cb(new Error('Command exited with a non-zero status'));
// } else {
// cb(null);
// }
//});
这一改变使我能够在没有任何可见错误的情况下运行react-native run-android.它会启动模拟器和应用程序.
让它在Windows上运行的最后一个缺失部分是:
我得到"无法下载JS包…"死亡的红屏.似乎react-native run-android未能启动它，尽管它打印出Starting JS server....请参见底部的完整输出.
有人能帮忙解决吗？
非常感谢.
Y:\Mobile>react-native run-android
Starting JS server...
Building and installing the app on the device (cd android && gradlew.bat installDebug)...
:app:preBuild UP-TO-DATE
:app:preDebugBuild UP-TO-DATE
:app:checkDebugManifest
:app:preReleaseBuild UP-TO-DATE
:app:prepareComAndroidSupportAppcompatV72300Library UP-TO-DATE
:app:prepareComAndroidSupportSupportV42300Library UP-TO-DATE
:app:prepareComFacebookFrescoDrawee061Library UP-TO-DATE
:app:prepareComFacebookFrescoFbcore061Library UP-TO-DATE
:app:prepareComFacebookFrescoFresco061Library UP-TO-DATE
:app:prepareComFacebookFrescoImagepipeline061Library UP-TO-DATE
:app:prepareComFacebookFrescoImagepipelineOkhttp061Library UP-TO-DATE
:app:prepareComFacebookReactReactNative0110Library UP-TO-DATE
:app:prepareOrgWebkitAndroidJscR174650Library UP-TO-DATE
:app:prepareDebugDependencies
:app:compileDebugAidl UP-TO-DATE
:app:compileDebugRenderscript UP-TO-DATE
:app:generateDebugBuildConfig UP-TO-DATE
:app:generateDebugAssets UP-TO-DATE
:app:mergeDebugAssets UP-TO-DATE
:app:generateDebugResValues UP-TO-DATE
:app:generateDebugResources UP-TO-DATE
:app:mergeDebugResources UP-TO-DATE
:app:processDebugManifest UP-TO-DATE
:app:processDebugResources UP-TO-DATE
:app:generateDebugSources UP-TO-DATE
:app:processDebugJavaRes UP-TO-DATE
:app:compileDebugJavaWithJavac UP-TO-DATE
:app:compileDebugNdk UP-TO-DATE
:app:compileDebugSources UP-TO-DATE
:app:preDexDebug UP-TO-DATE
:app:dexDebug UP-TO-DATE
:app:validateDebugSigning
:app:packageDebug UP-TO-DATE
:app:zipalignDebug UP-TO-DATE
:app:assembleDebug UP-TO-DATE
:app:installDebug
Installing APK 'app-debug.apk' on 'reactnative(AVD) - 6.0'
Installed on 1 device.
BUILD SUCCESSFUL
Total time: 20.332 secs
Starting the app (adb shell am start -n com.mobile/.MainActivity)...
Starting: Intent { cmp=com.mobile/.MainActivity }
使现代化
以下是我在react-native run-android次工作后试图让开发服务器运行的更多细节:
我试过了，但是"npm开始"失败了:
Y:\Mobile>npm start
> Mobile@0.0.1 start Y:\Mobile
> node_modules/react-native/packager/packager.sh
'node_modules' is not recognized as an internal or external command,
operable program or batch file.
npm ERR! Windows_NT 6.3.9600
npm ERR! argv "C:\\Program Files\\nodejs\\node.exe" "C:\\Program Files\\nodejs\\node_modules\\npm\\bin\\npm-cli.js" "start"
npm ERR! node v4.0.0
npm ERR! npm v2.14.2
npm ERR! code ELIFECYCLE
npm ERR! Mobile@0.0.1 start: `node_modules/react-native/packager/packager.sh`
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the Mobile@0.0.1 start script 'node_modules/react-native/packager/packager.sh'.
npm ERR! This is most likely a problem with the Mobile package,
npm ERR! not with npm itself.
npm ERR! Tell the author that this fails on your system:
npm ERR! node_modules/react-native/packager/packager.sh
npm ERR! You can get their info via:
npm ERR! npm owner ls Mobile
npm ERR! There is likely additional logging output above.
npm ERR! Please include the following file with any support request:
npm ERR! Y:\Mobile\npm-debug.log
然后我try 了react-native start次，失败如下:
Y:\Mobile>react-native start
module.js:338
throw err;
^
Error: Cannot find module 'Y:\Mobile\packager.js'
at Function.Module._resolveFilename (module.js:336:15)
at Function.Module._load (module.js:286:25)
at Function.Module.runMain (module.js:475:10)
at startup (node.js:117:18)
at node.js:951:3
然后我试了node node_modules/react-native/packager/packager.js个，实际上是这样的:
Y:\Mobile>node node_modules/react-native/packager/packager.js
┌────────────────────────────────────────────────────────────────────────────┐
│ Running packager on port 8081. │
│ │
│ Keep this packager running while developing on any JS projects. Feel │
│ free to close this tab and run your own packager instance if you │
│ prefer. │
│ │
│ https://github.com/facebook/react-native │
│ │
└────────────────────────────────────────────────────────────────────────────┘
Looking for JS files in
Y:\Mobile
React packager ready.
[10:43:07 AM] <START> Building Dependency Graph
[10:43:07 AM] <START> Crawling File System
[10:43:17 AM] <END> Crawling File System (10513ms)
[10:43:17 AM] <START> Building in-memory fs for JavaScript
[10:43:18 AM] <END> Building in-memory fs for JavaScript (1116ms)
[10:43:18 AM] <START> Building in-memory fs for Assets
[10:43:19 AM] <END> Building in-memory fs for Assets (1090ms)
[10:43:19 AM] <START> Building Haste Map
[10:43:20 AM] <START> Building (deprecated) Asset Map
[10:43:20 AM] <END> Building (deprecated) Asset Map (221ms)
[10:43:20 AM] <END> Building Haste Map (639ms)
[10:43:20 AM] <END> Building Dependency Graph (13360ms)
但我在死亡的红色屏幕上按了Reload JS，大约30秒后，它再次失败，开发服务器控制台将打印出来，然后退出开发服务器:
<--- Last few GCs --->
172210 ms: Scavenge 1402.5 (1455.6) -> 1402.5 (1455.6) MB, 9.6 / 0 ms (+ 2.0 ms in 1 steps since last GC) [allocation failure] [incremental marking delaying mark-sweep].
173083 ms: Mark-sweep 1402.5 (1455.6) -> 1402.5 (1455.6) MB, 872.5 / 0 ms (+ 3.0 ms in 2 steps since start of marking, biggest step 2.0 ms) [last resort gc].
173954 ms: Mark-sweep 1402.5 (1455.6) -> 1402.4 (1455.6) MB, 871.1 / 0 ms [last resort gc].
<--- JS stacktrace --->
==== JS stack trace =========================================
Security context: 0000018472E37349 <JS Object>
1: join [path.js:~217] [pc=0000039512658044] (this=0000006899C67369 <an Object with map 0000008FE2423E19>)
2: arguments adaptor frame: 3->0
3: /* anonymous */(aka /* anonymous */) [Y:\Mobile\node_modules\react-native\packager\react-packager\src\DependencyResolver\DependencyGraph\ResolutionRequest.js:~226] [pc=00000395137E2AFA] (this=0000018472E04131 <undefined>,realModuleN...
FATAL ERROR: CALL_AND_RETRY_LAST Allocation failed - process out of memory
我想我们很快就能让它在Windows上运行了，我只需要一点帮助来完成最后的部分.
请帮忙