android webkit 初始化流程

以android 4.2为例

1, android 4.2中 WebViewClassic.java 为 WebView.java的代理类.

2,程序运行后,浏览器首先加载webkit so.

　　　　WebViewCore.java ,apk 运行后只加载一次.

　　　　static {

　　　　　　// Load libwebcore and libchromium_net during static initialization.

　　　　　　// This happens in the zygote process so they will be shared read-only

　　　　　　// across all app processes.

　　　　　　try {

　　　　　　　　System.loadLibrary("chromium_net");

　　　　　　　　System.loadLibrary("webcore");

　　　　　　} catch (UnsatisfiedLinkError e) {

　　　　Log.e(LOGTAG, "Unable to load native support libraries.");

　　　　}

3,loadLibary 后则会初始化对应的JNI.将framwork 层webkit与c++ 层关联对应起来.

　　主要处理在 WebCoreJniOnLoad.cpp

static RegistrationMethod gWebCoreRegMethods[] = {

{ "JavaBridge", android::registerJavaBridge },

{ "WebFrame", android::registerWebFrame },

{ "WebViewCore", android::registerWebViewCore },

{ "WebHistory", android::registerWebHistory },

{ "WebIconDatabase", android::registerWebIconDatabase },

{ "WebSettingsClassic", android::registerWebSettings },

#if ENABLE(DATABASE)

{ "WebStorage", android::registerWebStorage },

#endif

{ "WebView", android::registerWebView },

{ "ViewStateSerializer", android::registerViewStateSerializer },

{ "GeolocationPermissions", android::registerGeolocationPermissions },

{ "MockGeolocation", android::registerMockGeolocation },

#if ENABLE(VIDEO)

{ "HTML5Audio", android::registerMediaPlayerAudio },

{ "HTML5VideoViewProxy", android::registerMediaPlayerVideo },

#endif

{ "DeviceMotionAndOrientationManager", android::registerDeviceMotionAndOrientationManager },

{ "CookieManager", android::registerCookieManager },

{ "CacheManager", android::registerCacheManager },

};

4.创建WebView:

　　　　webview1
= (WebView) findViewById(R.id.WebView1);

　　　　该行调用后,则会初始webkit
,java 及c++
层的关键类.