Intent i = new Intent();
// MUST instantiate android browser, otherwise it won't work
i.setComponent(new ComponentName("com.android.browser", "com.android.browser.BrowserActivity"));
i.setAction(Intent.ACTION_VIEW);
String html = "<html><body>hello World</body></html>";
// May work without url encoding, but I think is advisable
// URLEncoder.encode replace space with "+", must replace again with %20
String dataUri = "data:text/html," + URLEncoder.encode(html).replaceAll("\\+","%20");
i.setData(Uri.parse(dataUri));
startActivity(i);