WebViewClient播放特定内容

public class MyWebViewClient extends WebViewClient { 
@Override 
public boolean shouldOverrideUrlLoading(WebView view, String url) { 
if (url.startsWith("vnd.youtube:")){
Intent i = new Intent(Intent.ACTION_VIEW, Uri.parse(url)); startActivity(i); 
List list = getPackageManager().queryIntentActivities(i, PackageManager.MATCH_DEFAULT_ONLY); 
if (list.size() == 0) { 
i = new Intent(getApplicationContext(), YouTube.class); 
} 
return true;} 

else { 
return super.shouldOverrideUrlLoading(view, url); 
} 
} 
}