Android webview cannot render youtube video embedd

问题:

This is about loading youtube videos using latest embedded format (iframe) inside a webview.

Example of the iframe embed format

<iframe width="637" height="358" src="http://www.youtube.com/embed/olC42gO-Ln4?fs=1&amp;feature=oembed" frameborder="0" allowfullscreen=""></iframe>

Test the code on Android 2.3.3 & 3.2 devices (HTC Desire & Asus Transformer), the webview would only show a black rectangle.

I tried a similar embed from vimeo

<iframe src="http://player.vimeo.com/video/35693267" width="640" height="360" frameborder="0"></iframe>

In 2.3, video played correctly
In 3.2, a black rectangle flashed and disappeared, the iframe area is blank.

Finally if the old embed format (using the object tag) is used, the video is displayed properly inside the webview in both 2.3.3 & 3.2.

I have checked related questions and added

android:hardwareAccelerated="true"

in the application and/or activity tag but still no video in both 2.3 & 3.2 devices.

This is a big problem because more websites are now using the newest format (iframe) to embed their youtube videos. Android/Youtube Team, please take a look at this problem.

回答1:

Android browsers are utterly buggy what comes to video playback and embedding. It simply does not work across devices. Trying to get it working is just waste of your time. My suggestion is that you don't try to include <iframe> but simply provide a thumbnail of the video which directly links to YouTube page or h264 file.

Earlier discussion, with a possible solution.

Google Reader-esque optimizing of WebViews on Android

回答2:

If you want to play videos within your WebView you NEED to load the data with a base URL!

DONT do this:

mContentWebView.loadDataWithBaseURL(null, webViewContentString,
            "text/html", "UTF-8", null);

DO THIS INSTEAD:

    //veryVeryVery important for playing the videos!
    mContentWebView.loadDataWithBaseURL(theBaseUrl, webViewConentString,
            "text/html", "UTF-8", null);

The Base URL will be the something like the "original" url of what you are displaying in your WebView. So let's say you are making a news reader, the WebView's base url will be the url of the original story.

Good Luck!

Also remember to set up your WebView...Like so...

    mContentWebView.setWebChromeClient(new WebChromeClient());
    mContentWebView.getSettings().setPluginState(WebSettings.PluginState.ON);
    mContentWebView.getSettings().setPluginState(WebSettings.PluginState.ON_DEMAND);
    mContentWebView.setWebViewClient(new WebViewClient());
    mContentWebView.getSettings().setJavaScriptEnabled(true);

You need to have hardware acceleration turned on in the Manifest (only available on SDK 14 and above).

Ex. Hardware Acceleration On:

<application
    android:name="com.example.app"
    android:icon="@drawable/ic_launcher"
    android:label="@string/app_name"
    android:theme="@style/AppTheme"
    android:hardwareAccelerated="true">
<!-- hardwareAccelerated requires SDK 14 -->
...
</application>

回答3:

HTML5 Video support

In order to support inline HTML5 video in your application, you need to have hardware acceleration turned on, and set a WebChromeClient.

http://developer.android.com/reference/android/webkit/WebView.html

(Hope it help someone)

回答4:

I would suggest using some code to detect the environment of the user... use the iframe code only for ios devices (iphone, ipod, ipad) and use the old code for everyone else.

回答5:

This Code made exactly fit to different device

webView.setInitialScale(1);
    webView.setWebChromeClient(new WebChromeClient());

    webView.getSettings().setAllowFileAccess(true);
    webView.getSettings().setPluginState(WebSettings.PluginState.ON);
    webView.getSettings().setPluginState(WebSettings.PluginState.ON_DEMAND);
    webView.setWebViewClient(new WebViewClient());
    webView.getSettings().setJavaScriptEnabled(true);
    webView.getSettings().setLoadWithOverviewMode(true);
    webView.getSettings().setUseWideViewPort(true);
    DisplayMetrics displaymetrics = new DisplayMetrics();
    getWindowManager().getDefaultDisplay().getMetrics(displaymetrics);
    int height = displaymetrics.heightPixels;
    int width = displaymetrics.widthPixels;

    Log.e(SimpleBillsConstants.SIMPLE_BILLS, width + "-" + height);

    String data_html = "<!DOCTYPE html><html> <head> <meta charset=\"UTF-8\"><meta name=\"viewport\" content=\"target-densitydpi=high-dpi\" /> <meta name=\"viewport\" content=\"width=device-width, initial-scale=1\"> <link rel=\"stylesheet\" media=\"screen and (-webkit-device-pixel-ratio:1.5)\" href=\"hdpi.css\" /></head> <body style=\"background:black;margin:0 0 0 0; padding:0 0 0 0;\"> <iframe style=\"background:black;\" width=' "+width+"' height='"+height+"' src=\""+ VIDEO_URL+"\" frameborder=\"0\"></iframe> </body> </html> ";



    webView.loadDataWithBaseURL("http://vimeo.com", data_html, "text/html", "UTF-8", null);

回答6:

This worked for me- the code opens youtube site and can play its videos inside WebView:

mWebView = (WebView) findViewById(R.id.webview);     

WebSettings webSettings = mWebView.getSettings();
webSettings.setJavaScriptEnabled(true);


String frameVideo = "<html><body>Youtube video .. <br> <iframe width=\"320\" height=\"315\" src=\"https://www.youtube.com/\" frameborder=\"0\" allowfullscreen></iframe></body></html>";

mWebView.loadData(frameVideo, "text/html", "utf-8");

mWebView.loadUrl("http://www.youtube.com/");

mWebView.setWebViewClient(new WebViewClient());