Android WebView LoadUrl过程

来源：互联网发布：faking it 编辑：程序博客网时间：2024/06/05 08:31

请从文章最后往前看

这个过程只包含从java层调用到C++层的代码，至于如何获取到网络数据并加载到页面上并没有涉及。

本文只记录了loadurl的过程，源码基于android 4.2.2

#0 MessageLoop::PostTask

#1android::WebUrlLoaderClient::start

#2 android::WebUrlLoader::start

#3 WebCore::ResourceLoaderAndroid::start

#4 WebCore::ResourceHandle::start

#5 WebCore::ResourceHandle::create

#6WebCore::MainResourceLoader::loadNow

#7WebCore::MainResourceLoader::load

#8 WebCore::DocumentLoader::startLoadingMainResource

#9 WebCore::FrameLoader::continueLoadAfterWillSubmitForm

#10 WebCore::FrameLoader::continueLoadAfterNavigationPolicy

#11 WebCore::FrameLoader::callContinueLoadAfterNavigationPolicy

#12 WebCore::PolicyCallback::call

#13 WebCore::PolicyChecker::continueAfterNavigationPolicy

#14 android::FrameLoaderClientAndroid::dispatchDecidePolicyForNavigationAction

#15 WebCore::PolicyChecker::checkNavigationPolicy

#16 WebCore::FrameLoader::loadWithDocumentLoader

#17 WebCore::FrameLoader::load

#18 WebCore::FrameLoader::load

#19WebCore::FrameLoader::load

/external/webkit/Source/WebKit/android/jni/WebCoreFrameBridge.cpp
通过static JNINativeMethod gBrowserFrameNativeMethods映射java native方法为c++方法
{ "nativeLoadUrl", "(Ljava/lang/String;Ljava/util/Map;)V",
(void*) LoadUrl },
LoadUrl(JNIEnv *env, jobject obj, jstring url, jobject headers)

WebCore::Frame* pFrame = GET_NATIVE_FRAME(env, obj);
WebCore::Frame是external/webkit/Source/WebCore/page/Frame.cpp
WTF::String webcoreUrl = jstringToWtfString(env, url);
WebCore::KURL kurl(WebCore::KURL(), webcoreUrl);
WebCore::ResourceRequest request(kurl);
pFrame->loader()->load(request, false);
pFrame->loader()返回 &m_loader
类型是FrameLoader，路径
external/webkit/Source/WebCore/loader/FrameLoader.cpp
load(const ResourceRequest& request, bool lockHistory)
load(const ResourceRequest& request, const SubstituteData& substituteData, bool lockHistory)
load(DocumentLoader* newDocumentLoader)
loadWithDocumentLoader(DocumentLoader* loader, FrameLoadType type, PassRefPtr<FormState> prpFormState)

BrowserFrame.java
loadUrl(String url, Map<String, String> extraHeaders)
nativeLoadUrl(url, extraHeaders);

WebViewCore.java
transferMessages
case LOAD_URL:
loadUrl(String url, Map<String, String> extraHeaders)
mBrowserFrame.loadUrl(url, extraHeaders);

mProvider --> WebViewClassic
mWebViewCore.sendMessage(EventHub.LOAD_URL, arg);
mProvider.loadUrlImpl(String url, Map<String, String> extraHeaders)
mProvider.loadUrlImpl(String url)
mProvider.loadUrl(String url)

WebView.java loadUrl(String url)

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