android - stopLoading() 到底做了什么？

Question

是的，我知道 stopLoading() 的文档说“停止当前负载。”

但是当我尝试使用它在加载新页面之前停止加载当前正在进行的页面时，它似乎没有表现 as desired :

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

如您在日志中所见，第一个 loadUrl() 的 WebViewClient.onPageFinished() 被调用，尽管 WebView.stopLoading() 1 秒前被调用。

这是为什么？

什么是stopLoading()真的吗？

Answer 1

you786 是对的:

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

对于他们在剩余消息中标记的 TODO，将首先处理。所以这导致了我很好奇的结果:在

中停止加载时

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

WebView 并没有真正停止，而是加载了自己的 404 页面(如果您不调用 stopLoading() 它通常会执行的操作):

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/