ErrorPage.java 文件源码

public static void loadErrorPage(final AmazonWebView webView, final String desiredURL, final int errorCode) {
    final Pair<Integer, Integer> errorResourceIDs = errorDescriptionMap.get(errorCode);

    if (errorResourceIDs == null) {
        throw new IllegalArgumentException("Cannot load error description for unsupported errorcode=" + errorCode);
    }

    // This is quite hacky: ideally we'd just load the css file directly using a '<link rel="stylesheet"'.
    // However WebView thinks it's still loading the original page, which can be an https:// page.
    // If mixed content blocking is enabled (which is probably what we want in Focus), then webkit
    // will block file:///android_res/ links from being loaded - which blocks our css from being loaded.
    // We could hack around that by enabling mixed content when loading an error page (and reenabling it
    // once that's loaded), but doing that correctly and reliably isn't particularly simple. Loading
    // the css data and stuffing it into our html is much simpler, especially since we're already doing
    // string substitutions.
    // As an added bonus: file:/// URIs are broken if the app-ID != app package, see:
    // https://code.google.com/p/android/issues/detail?id=211768 (this breaks loading css via file:///
    // references when running debug builds, and probably klar too) - which means this wouldn't
    // be possible even if we hacked around the mixed content issues.
    final String cssString = HtmlLoader.loadResourceFile(webView.getContext(), R.raw.errorpage_style, null);

    final Map<String, String> substitutionMap = new ArrayMap<>();

    final Resources resources = webView.getContext().getResources();

    substitutionMap.put("%page-title%", resources.getString(R.string.errorpage_title));
    substitutionMap.put("%button%", resources.getString(R.string.errorpage_refresh));

    substitutionMap.put("%messageShort%", resources.getString(errorResourceIDs.first));
    substitutionMap.put("%messageLong%", resources.getString(errorResourceIDs.second, desiredURL));

    substitutionMap.put("%css%", cssString);

    final String errorPage = HtmlLoader.loadResourceFile(webView.getContext(), R.raw.errorpage, substitutionMap);

    // We could load the raw html file directly into the webview using a file:///android_res/
    // URI - however we'd then need to do some JS hacking to do our String substitutions. Moreover
    // we'd have to deal with the mixed-content issues detailed above in that case.
    webView.loadDataWithBaseURL(desiredURL, errorPage, "text/html", "UTF8", desiredURL);
}