Android调试神器stetho使用详解和改造 (2)

官方对dump app的使用说明实在太少了,感觉非常捉急。研究了一番,大概知道了使用流程,即首先需要在App内,通过enableDumpapp方法注册自己的插件: Stetho.initialize(Stetho.newInitializerBuilder(context)

.enableDumpapp(new DumperPluginsProvider() { @Override public Iterable<DumperPlugin> get() { return new Stetho.DefaultDumperPluginsBuilder(context) .provide(new MyDumperPlugin()) .finish(); } }) .enableWebKitInspector(Stetho.defaultInspectorModulesProvider(context)) .build())

也可以使用默认的插件: Stetho.initialize(Stetho.newInitializerBuilder(this)

.enableDumpapp(new DumperPluginsProvider() { public Iterable<DumperPlugin> get() { return (new Stetho.DefaultDumperPluginsBuilder(StethoNetworkApplication.this)).finish(); } }).enableWebKitInspector(Stetho.defaultInspectorModulesProvider(context)) .build())

然后,stetho的github项目地址下有一个script文件夹:facebook/stetho-script 把这个文件夹下到本地,发现里面有几个文件: .gitignore dumpapp hprof_dump.sh stetho_open.py 说实话第一眼看上去根本不知道这东西干啥用的,dumpapp这文件看起来就跟可执行文件似的,但事实上它又不是exe,用记事本打开一看,是Python3的文件,我也是醉了…

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所以使用Python3.x来运行这个文件即可。(由于他还引用了stetho_open.py,为了看起来不那么别扭,我把几个文件都整合在一齐,搞了一个dump.py) 这里我并没有注册任何插件,但是由于Stetho自带了几个插件,我们可以看看他们的实现:

例如files插件,来试用一下:

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即用户发送命令时,Plugin的dump方法会被调用,Plugin通过dumpContext.getStdout()来获取输出流,将反馈输出到命令行:

public void dump(DumperContext dumpContext) throws DumpException { Iterator<String> args = dumpContext.getArgsAsList().iterator(); String command = ArgsHelper.nextOptionalArg(args, ""); if("ls".equals(command)) { this.doLs(dumpContext.getStdout()); } else if("tree".equals(command)) { this.doTree(dumpContext.getStdout()); } else if("download".equals(command)) { this.doDownload(dumpContext.getStdout(), args); } else { this.doUsage(dumpContext.getStdout()); if(!"".equals(command)) { throw new DumpUsageException("Unknown command: " + command); } } } Network Inspection

其实这也是重点之一了。我在这里添加了一个OkHttp的Inspector。 注意:此处有坑,因为你会发现用gradle添加的stetho依赖中没有StethoInterceptor这个类,你可以到stetho的github页面下载一下,同事需要跟你的OkHttp版本对应,因为2.x跟3.x对应的StethoInterceptor还有差异): 下载地址: facebook/stetho-okhttp3 facebook/stetho-okhttp 代码示例如下: public void testOkHttp(){

Thread thread = new Thread(new Runnable() { @Override public void run() { String url = "http://www.zhihu.com/"; OkHttpClient.Builder builder = new OkHttpClient.Builder()

.addNetworkInterceptor(new StethoInterceptor());

OkHttpClient client = builder.build(); Request request = new Request.Builder() .url(url) .get() .build(); try { Response response = client.newCall(request).execute(); } catch (IOException e) { e.printStackTrace(); } } }); thread.start();

}

运行这个函数,可以看到Network一栏的请求,每项网络请求发出时,Status处于Pending状态,收到回包后,Status等栏目都会变化,展示httpcode,请求耗时、回包数据类型等信息。

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当然这不是重点。重点是我们要对这个东西改造一下,他是如何抓下包来发送给Chrome的呢? 看一下StethoInterceptor的intercept函数,写了些注释:

private final NetworkEventReporter mEventReporter = NetworkEventReporterImpl.get(); public Response intercept(Chain chain) throws IOException { // 构造一个独特的eventID,一对网络事件(请求和回包)对应一个eventID String requestId = mEventReporter.nextRequestId(); Request request = chain.request(); // 准备发送请求 RequestBodyHelper requestBodyHelper = null; if (mEventReporter.isEnabled()) { requestBodyHelper = new RequestBodyHelper(mEventReporter, requestId); OkHttpInspectorRequest inspectorRequest = new OkHttpInspectorRequest(requestId, request, requestBodyHelper); // 请求即将发送,构造一个OkHttpInspectorRequest,报告给Chrome,此时Network会显示一条请求,处于Pending状态 mEventReporter.requestWillBeSent(inspectorRequest); } Response response; try { // 发送请求,获得回包 response = chain.proceed(request); } catch (IOException e) { // 如果发生了IO Exception,则通知Chrome网络请求失败了,显示对应的错误信息 if (mEventReporter.isEnabled()) { mEventReporter.httpExchangeFailed(requestId, e.toString()); } throw e; } if (mEventReporter.isEnabled()) { if (requestBodyHelper != null && requestBodyHelper.hasBody()) { requestBodyHelper.reportDataSent(); } Connection connection = chain.connection(); // 回包的header已收到,构造一个OkHttpInspectorResponse,发送给Chrome用于展示 mEventReporter.responseHeadersReceived( new OkHttpInspectorResponse( requestId, request, response, connection)); // 展示回包信息 ResponseBody body = response.body(); MediaType contentType = null; InputStream responseStream = null; if (body != null) { contentType = body.contentType(); responseStream = body.byteStream(); } responseStream = mEventReporter.interpretResponseStream( requestId, contentType != null ? contentType.toString() : null, response.header("Content-Encoding"), responseStream, new DefaultResponseHandler(mEventReporter, requestId)); if (responseStream != null) { response = response.newBuilder() .body(new ForwardingResponseBody(body, responseStream)) .build(); } } return response; }

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