上一篇讲解了腾讯 X5 内核的集成，这一篇是讲解 Crosswalk 的集成 Crosswalk 也是采用了Chromenium 内核，是一款开源的 web 引擎，开发者可以直接把 Crosswalk 嵌入到应用之中，当然也支持共享模式（系统中没有对应的 Crosswalk 库是会提示下载）。只不过 Crosswalk 已经停止维护了。
集成
想要使用 CrossWalk 有三种方式：
1.maven 远程依赖
//配置gradle repositories {maven {url 'https://download.01.org/crosswalk/releases/crosswalk/android/maven2'}}
compile 'org.xwalk:xwalk_core_library:23.53.589.4'
2.下载 zip 包后解压，然后以用开发工具Import Module导入，作为一个library依赖。
推荐使用stable（稳定版）！其他的分别是beta（测试版），canary（金丝雀版）。下载最新版本的zip包：23.53.589.4
3.下载aar 下载aar包后导入项目的 lib目 录下，然后在gradle中添加
repositories {flatDir {dirs 'libs'}
}
compile(name: 'crosswalk-23.53.589.4', ext: 'aar')
使用
1.manifest中添加
android:hardwareAccelerated="true" //application节点下开启硬件加速
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.READ_PHONE_STATE" />
<uses-permission android:name="android.permission.CAMERA" />
<uses-permission android:name="android.permission.RECORD_AUDIO" />
<uses-permission android:name="android.permission.MODIFY_AUDIO_SETTINGS" />
2.布局中添加
<org.xwalk.core.XWalkViewandroid:id="@+id/xwalkview"android:layout_width="match_parent"android:layout_height="match_parent"></org.xwalk.core.XWalkView>
3.新建 Activity 继承 XWalkActivity，onXWalkReady() 方法里面进行初始化操作
class MainActivity : XWalkActivity() {override fun onCreate(savedInstanceState: Bundle?) {super.onCreate(savedInstanceState)setContentView(R.layout.activity_main)}override fun onXWalkReady() {XWalkPreferences.setValue(XWalkPreferences.ANIMATABLE_XWALK_VIEW, true); //开启默认动画var setting = xwalkview.settingssetting.loadWithOverviewMode = falsesetting.javaScriptEnabled = true//支持jssetting.javaScriptCanOpenWindowsAutomatically = true//支持通过JS打开新窗口setting.useWideViewPort = true//将图片调整到合适webview的大小setting.loadWithOverviewMode = true //缩放至屏幕的大小setting.loadsImagesAutomatically = true //支持自动加载图片setting.supportMultipleWindows()//支持多窗口setting.setSupportZoom(true)setting.allowFileAccess = truesetting.setDomStorageEnabled(true)setting.allowContentAccess = truesetting.allowContentAccess = truesetting.domStorageEnabled = truexwalkview.requestFocus()setting.cacheMode = WebSettings.LOAD_NO_CACHExwalkview.setResourceClient(object : XWalkResourceClient(xwalkview) {override fun onLoadStarted(view: XWalkView?, url: String?) {super.onLoadStarted(view, url)}override fun onLoadFinished(view: XWalkView?, url: String?) {super.onLoadFinished(view, url)}override fun shouldOverrideUrlLoading(view: XWalkView?, url: String?): Boolean {view?.loadUrl(url)return true}override fun onReceivedSslError(view: XWalkView?, callback: ValueCallback<Boolean>?, error: SslError?) {callback?.onReceiveValue(true)super.onReceivedSslError(view, callback, error)}override fun onReceivedLoadError(view: XWalkView?, errorCode: Int, description: String?, failingUrl: String?) {super.onReceivedLoadError(view, errorCode, description, failingUrl)}override fun onProgressChanged(view: XWalkView?, process: Int) {super.onProgressChanged(view, process)if (...) {...progressBar.setProgress(process)...} else {...}}})xwalkview.setUIClient(object :XWalkUIClient(xwalkview){override fun onJsAlert(view: XWalkView?, url: String?, message: String?, result: XWalkJavascriptResult?): Boolean {return super.onJsAlert(view, url, message, result)}override fun onReceivedTitle(view: XWalkView?, title: String?) {super.onReceivedTitle(view, title)}override fun openFileChooser(view: XWalkView?, uploadFile: ValueCallback<Uri>?, acceptType: String?, capture: String?) {super.openFileChooser(view, uploadFile, acceptType, capture)}})xwalkview.loadUrl("your url")} override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {if (xwalkview!=null){xwalkview.onActivityResult(requestCode, resultCode, data)}}override fun onNewIntent(intent: Intent?) {if (xwalkview != null) {xwalkview.onNewIntent(intent)}}
override fun onDestroy() {super.onDestroy()XWalkPreferences.setValue(XWalkPreferences.ANIMATABLE_XWALK_VIEW, false);}
}
XWalkUIClient 对应系统 webview 中的 WebChromeClient
XWalkResourceClient 对应系统 webview 的 WebViewClient
- 监听页面生命
override fun onResume() {super.onResume()xwalkview?.let {xwalkview.pauseTimers()xwalkview.onHide()}
}
override fun onPause() {super.onPause()xwalkview?.let {xwalkview.pauseTimers()xwalkview.onHide()}
}
- 判断页面返回
if (xwalkview.navigationHistory.canGoBack()) {xwalkview.getNavigationHistory().navigate(XWalkNavigationHistory.Direction.BACKWARD, 1)
} else {finish()
}
提示
在使用 Crosswalk 的过程遇到了几个问题，在这里提一下，希望能有一点帮助。
1.lang.RuntimeException: Crosswalk's APIs are not ready yet异常：请在onready里面进行相关设置和加载页面
2.使用第一种 maven 集成方式 可能会报资源异常
configurations.all {resolutionStrategy {force 'com.android.support:support-v4:27.1.0'//自己的版本号}
}
3.Crosswalk 加载 SSL 证书有问题的网站时会报 Rquest was denied for security
override fun onReceivedSslError(view: XWalkView?, callback: ValueCallback<Boolean>?, error: SslError?) {callback?.onReceiveValue(true) //系统webview中的是handler.process()
}
添加上述代码后会回调 onReceivedLoadError并报net:: ERR_SECURITY_RESPONSE。这个问题折腾了很久，在 xwalkview的论坛 中发现 Crosswalk 会阻止连接到不信任的 SSL。
最后发现源码中的 SsLUtil.java 会阻止加载。
public static boolean shouldDenyRequest(int error)
{assert error >= -215 && error <= -200;switch (error){case -213:case -212:case -211:case -208:case -207:case -206:case -203: // case -202: case -201:
// case -200: case -150:case -129: return true;}return false;
}
修改后的资源已忽略证书安全问题「不建议忽略证书安全问题，我是测试环境所需」
