Android: Show youtube channel in webview using nexus 4

Question

I'm using a webview to show a youtube channel. Using a nexus 4 it is not possible to play video (only audio starts). I need to maintain the same graphic of the m.youtube.com/user/someuser so i can't use youtube api

Here is my code

public class MainActivity extends Activity {

    WebView mWebView;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);       

        mWebView = (WebView) findViewById(R.id.webView1); 
        mWebView.getSettings().setJavaScriptEnabled(true);
        mWebView.getSettings().setPluginState(PluginState.ON);

        final Activity activity = this;
        mWebView.setWebChromeClient(new WebChromeClient() {
          public void onProgressChanged(WebView view, int progress) {
            // Activities and WebViews measure progress with different scales.
            // The progress meter will automatically disappear when we reach 100%
            activity.setProgress(progress * 1000);
          }
        });

        mWebView.setWebViewClient(new MyOwnWebViewClient());   


        mWebView.loadUrl("http://m.youtube.com/user/someuser");//a channel youtube url     
        mWebView.setWebViewClient(new MyOwnWebViewClient());      
    }

    @Override
    public boolean onKeyDown(int keyCode, KeyEvent event) {
        if ((keyCode == KeyEvent.KEYCODE_BACK) && mWebView.canGoBack()) {
            mWebView.goBack();
            return true;
        }
        return super.onKeyDown(keyCode, event);
    }
    public class MyOwnWebViewClient extends WebViewClient {
        @Override
        public boolean shouldOverrideUrlLoading(WebView view, String url) {
            view.loadUrl(url);
            return true;
        }

    }
}

I have googled a lot but I can't find a solution. The last code i took is from this post:

Youtube Video in WebView doesn't load

Could anyone help me?

Thanks thousand