when my webView load this page , it was blank-page or white page only I touch the screen the content can only show

    private WebView webview;
    private ProgressDialog mProgressDialog;
    private Context mContext;
    public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_web);
    mContext = this;
    webview = (WebView)findViewById(R.id.myWebView);
    String url = (String)getIntent().getExtras().get("url");
    webview.getSettings().setJavaScriptEnabled(true);
    webview.setWebViewClient(new MyWebViewClient());
    if(url!=null){
        webview.loadUrl(url);
    }
}
class MyWebViewClient extends WebViewClient {
    @Override
    public void onPageStarted(WebView view, String url, Bitmap favicon) {
        super.onPageStarted(view, url, favicon);
        mProgressDialog = ProgressDialog.show(mContext, "tips", "wate···the view is loading", true, false);
    }

    @Override
    public void onPageFinished(WebView view, String url) {
        mProgressDialog.dismiss();
        super.onPageFinished(view, url);
    }
}