stopLoading() 究竟是做什么的？

Question

是的，我知道stopLoading()的文档中写道，“停止当前加载。”

但是当我试图在加载新页面之前使用它来停止当前正在进行的页面加载时，它似乎并不表现出期望中的行为：在这里。

07-24 12:53:30.177: V/WebView.loadUrl: http://www.google.com
07-24 12:53:30.227: V/WebViewClient.onPageStarted: http://www.google.com

===> WebView.stopLoading() called here <====

07-24 12:53:31.917: V/WebView.loadUrl: http://www.stackoverflow.com
07-24 12:53:32.697: V/WebViewClient.onPageFinished: http://www.google.com

07-24 12:53:32.767: V/WebViewClient.onPageStarted: http://www.stackoverflow.com
07-24 12:53:33.587: V/WebViewClient.onPageFinished: http://www.stackoverflow.com

从日志中可以看到，尽管大约1秒之前调用了WebView.stopLoading()，但第一个loadUrl()的WebViewClient.onPageFinished()仍被调用。

为什么会这样呢？

stopLoading()到底做了什么？

- scatmoi

---

我猜它只是设置了一个标志，告诉WebView不要运行任何像onPageFinished等钩子。我认为它实际上不会停止网络连接。 - you786

Answer 1

你786是正确的：

public void stopLoading() {
    checkThread();
    // TODO: should we clear all the messages in the queue before sending
    // STOP_LOADING?
    switchOutDrawHistory();
    mWebViewCore.sendMessage(EventHub.STOP_LOADING);
}

他们在剩余的消息中标记了一个待办事项，希望该事项首先得到处理。这让我很好奇：当停止加载时会发生什么？

WebViewClient.onReceivedError(WebView view, int errorCode, String description, String failingUrl)

WebView并没有真正停止，而是加载自己的404页面（如果您不调用stopLoading()方法，它通常会这样做）：

11-07 16:30:01.112: I/MainActivity(19189): Loading: http://92.53.45.42
11-07 16:30:01.253: V/MainActivity.WebViewClient(19189): SHOULD_INTERCEPT_REQUEST: http://92.53.45.42/
11-07 16:30:01.347: V/MainActivity.WebViewClient(19189): PAGE_STARTED: http://92.53.45.42/
11-07 16:30:01.347: V/MainActivity.WebChromeClient(19189): ON_PROGRESS_CHANGED: 10
11-07 16:30:01.347: V/MainActivity.WebViewClient(19189): LOAD_RESOURCE: http://92.53.45.42/
11-07 16:30:25.292: I/GATE(19189): <GATE-M>DEV_ACTION_ERROR</GATE-M>
11-07 16:30:25.300: E/MainActivity.WebViewClient(19189): (CONNECT - Failed to connect to the server) -> http://92.53.45.42/
11-07 16:30:25.300: W/MainActivity.WebViewClient(19189): loading stopped..:
11-07 16:30:25.300: V/MainActivity.WebViewClient(19189): PAGE_STARTED: http://92.53.45.42/
11-07 16:30:25.300: I/MainActivity.WebViewClient(19189): PAGE_FINISHED: http://92.53.45.42/
11-07 16:30:25.339: I/MainActivity.WebChromeClient(19189): ON_RECEIVED_TITLE: Webseite nicht verfügbar
11-07 16:30:25.339: V/MainActivity.WebChromeClient(19189): GET_VISITED_HISTORY
11-07 16:30:25.339: I/GATE(19189): <GATE-M>DEV_ACTION_COMPLETED</GATE-M>
11-07 16:30:25.339: V/MainActivity.WebChromeClient(19189): ON_PROGRESS_CHANGED: 100
11-07 16:30:25.339: I/MainActivity.WebViewClient(19189): PAGE_FINISHED: http://92.53.45.42/

- Marvin Emil Brach