title: Android reading html file from external storage
body: <p>I am trying to show the html files in /storage/sdcard0/... </p>
  
  <pre><code>WebView engine = (WebView) (findViewById(R.id.webView1));
  engine.setWebViewClient(new WebViewClient());
  engine.loadUrl(Environment.getExternalStorageDirectory().getPath() + "testing.html");
  </code></pre>
  
  <p>but the webpage failed to display.... Can anybody help? Thanks!</p>