一、问题描述

　　HTML5提供了很多新的特性比如，视频播放、web本地存储、地理定位、应用缓存、Canvas等，但这些特性需要浏览器的支持，在Android应用中我们可以使用WebView构建Web应用，提供对HTML5技术的支持，WebView组件可以通过  setWebChromeClient()和setWebViewClient()加载WebViewClient与WebChromeClient。

WebViewClient主要帮助WebView处理各种通知、请求事件的

WebChromeClient主要辅助WebView处理Javascript的对话框、网站图标、网站title、加载进度等

WebSeting通过该组件实现对浏览器的配置，如设置支持javascript脚本 、允许访问文件 、缩放控制按钮、支持缩放 等

　　下面就使用WebView播放HTML5的视频文件，效果如图

二、代码实现

1、编写HTML5WebView，重写WebView

public class HTML5WebView extends WebView { private Context mContext; private MyWebChromeClient mWebChromeClient; private View mCustomView; private FrameLayout mCustomViewContainer; private WebChromeClient.CustomViewCallback mCustomViewCallback; private FrameLayout mContentView; private FrameLayout mBrowserFrameLayout; private FrameLayout mLayout; static final String LOGTAG = "HTML5WebView"; private void init(Context context) { mContext = context; Activity a = (Activity) mContext; mLayout = new FrameLayout(context); mBrowserFrameLayout = (FrameLayout) LayoutInflater.from(a). inflate(R.layout.custom_screen, null); mContentView = (FrameLayout) mBrowserFrameLayout.findViewById(R.id.main_content); mCustomViewContainer = (FrameLayout) mBrowserFrameLayout. findViewById(R.id.fullscreen_custom_content); mLayout.addView(mBrowserFrameLayout, COVER_SCREEN_PARAMS); mWebChromeClient = new MyWebChromeClient(); setWebChromeClient(mWebChromeClient); setWebViewClient(new MyWebViewClient()); //配置webview WebSettings s = getSettings(); s.setBuiltInZoomControls(true);//设置支持缩放 s.setLayoutAlgorithm(WebSettings.LayoutAlgorithm.NARROW_COLUMNS); s.setUseWideViewPort(true);//设置此属性，可任意比例缩放 s.setLoadWithOverviewMode(true); s.setSaveFormData(true); s.setJavaScriptEnabled(true);//支持js s.setGeolocationEnabled(true); s.setGeolocationDatabasePath("/data/data/com.jereh.html5webview/databases/"); s.setDomStorageEnabled(true); mContentView.addView(this); } public HTML5WebView(Context context) { super(context); init(context); } public HTML5WebView(Context context, AttributeSet attrs) { super(context, attrs); init(context); } public HTML5WebView(Context context, AttributeSet attrs, int defStyle) { super(context, attrs, defStyle); init(context); } public FrameLayout getLayout() { return mLayout; } public boolean inCustomView() { return (mCustomView != null); } public void hideCustomView() { mWebChromeClient.onHideCustomView(); } @Override public boolean onKeyDown(int keyCode, KeyEvent event) { if (keyCode == KeyEvent.KEYCODE_BACK) { if ((mCustomView == null) && canGoBack()){ goBack(); return true; } } return super.onKeyDown(keyCode, event); } private class MyWebChromeClient extends WebChromeClient { private Bitmap mDefaultVideoPoster; private View mVideoProgressView; // Android 使WebView支持HTML5 Video（全屏）播放的方法 @Override public void onShowCustomView(View view, WebChromeClient.CustomViewCallback callback){ HTML5WebView.this.setVisibility(View.GONE); (mCustomView != null) { callback.onCustomViewHidden(); return; } mCustomViewContainer.addView(view); mCustomView = view; mCustomViewCallback = callback; mCustomViewContainer.setVisibility(View.VISIBLE); } @Override public void onHideCustomView() { if (mCustomView == null) return; // Hide the custom view. mCustomView.setVisibility(View.GONE); // Remove the custom view from its container. mCustomViewContainer.removeView(mCustomView); mCustomView = null; mCustomViewContainer.setVisibility(View.GONE); mCustomViewCallback.onCustomViewHidden(); HTML5WebView.this.setVisibility(View.VISIBLE); } @Override public Bitmap getDefaultVideoPoster() { if (mDefaultVideoPoster == null) { mDefaultVideoPoster = BitmapFactory.decodeResource( getResources(), R.drawable.default_video_poster); } return mDefaultVideoPoster; } @Override public View getVideoLoadingProgressView() { if (mVideoProgressView == null) { LayoutInflater inflater = LayoutInflater.from(mContext); mVideoProgressView = inflater.inflate(R.layout.video_loading_progress, null); } return mVideoProgressView; } @Override public void onReceivedTitle(WebView view, String title) { ((Activity) mContext).setTitle(title); } @Override public void onProgressChanged(WebView view, int newProgress) { ((Activity) mContext).getWindow().setFeatureInt(Window.FEATURE_PROGRESS, newProgress*100); } @Override public void onGeolocationPermissionsShowPrompt(String origin, GeolocationPermissions.Callback callback) { callback.invoke(origin, true, false); } } private class MyWebViewClient extends WebViewClient { @Override public boolean shouldOverrideUrlLoading(WebView view, String url) { return false; } } static final FrameLayout.LayoutParams COVER_SCREEN_PARAMS = new FrameLayout.LayoutParams( ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT); }

2、编写Activity，测试应用