I have and application, which displays html content from other sources. This content may contain iframe embedded videos. For special case of twitter videos the behavior is different and video remains blank after running.
The logcat shows message:
Refused to display 'videoUrlHere' in a frame because an ancestor violates the following Content Security Policy directive: "frame-ancestors *".", source: about:blank (0)
Example url is: https://twitter.com/i/videos/tweet/840948416742117377?embed_source=clientlib&player_id=0&rpc_init=1&language_code=en
The interesting thing is that this approach works on android 5 and lower.
Loading of content
mWebView.loadDataWithBaseURL("file:///android_asset/", mHtmlSource.toString(), "text/html", "utf-8", null);
Initialization of WebView:
mWebView.setWebViewClient(new MyWebViewClient());
mWebView.setWebChromeClient(new WebChromeClient());
mWebView.addJavascriptInterface(new InjectedAppObject(), "InjectedAppObject");
WebSettings webSettings = mWebView.getSettings();
webSettings.setJavaScriptEnabled(true);
webSettings.setDomStorageEnabled(true);
webSettings.setSupportZoom(true);
webSettings.setBuiltInZoomControls(true);
webSettings.setDisplayZoomControls(false);
webSettings.setLoadsImagesAutomatically(true);
Headers added to html:
<html lang=\"cs\" dir=\"ltr\">
<head>
<meta charset=\"utf-8\">
<meta name=\"keywords\" content=\"\">
<meta name=\"description\" content=\"\">
<meta http-equiv=\"Content-Security-Policy\" content=\"default-src * data: \'unsafe-inline\' \'unsafe-eval\'; frame-ancestors *; \">
<meta name=\"robots\" content=\"index,follow\">
<title>App title</title>
<link href=\"file:///android_asset/html/css/style.css\" rel=\"stylesheet\">
<script src=\"file:///android_asset/html/js/jquery.min.js\"></script>
<script src=\"file:///android_asset/html/js/app.js\"></script>
<script src=\"file:///android_asset/html/js/disposable-iframe.min.js\"></script>
<script src=\"file:///android_asset/html/js/iframe.js\"></script>
</head>
Related
I'm trying to load html with CSS which has ID selector and the file doesn't load to the webview as expected.
This is the file which I tried to load:
<!DOCTYPE html>
<html>
<head>
<style>
#para1 {
text-align: center;
color: red;
}
</style>
</head>
<body>
<p id="para1">Hello World!</p>
<p>This paragraph is not affected by the style.</p>
</body>
</html>
However when I tried the code below,it loads to the webview.
<html>
<head>
<style>
h1 {color:red;}
p {color:blue;}
</style>
</head>
<body>
<h1>A heading</h1>
<p>A paragraph.</p>
</body>
</html>
I have enabled these properties on the WebView:
mWebView.setWebViewClient(new CustomWebViewClient());
mWebView.setWebChromeClient(new CustomWebChromeClient());
mWebView.getSettings().setSupportZoom(true); // ZoomControls
mWebView.getSettings().setBuiltInZoomControls(true); // Multitouch
mWebView.getSettings().setDisplayZoomControls(false);
mWebView.getSettings().setJavaScriptEnabled(true);
mWebView.getSettings().setDomStorageEnabled(true);
mWebView.getSettings().setLoadWithOverviewMode(true);
mWebView.getSettings().setUseWideViewPort(CONFIG.webviewEnableViewport());
mWebView.getSettings().setAllowFileAccess(true);
mWebView.requestFocus(View.FOCUS_DOWN);
mWebView.setHorizontalScrollBarEnabled(true);
mWebView.setVerticalScrollBarEnabled(true);
Can anyone help me on this?
I could solve the issue by using the base64 encoding.
String encodedHtml = Base64.encodeToString(myHtmlString.getBytes(),
Base64.NO_PADDING);
mWebView.loadData(encodedHtml, "text/html", "base64");
I need some help on how to inject CSS before showing WebView. Appreciate any help.
I need to inject CSS into WebView from assets, before the WebView shows.
You should load url contents manually to your html structure. put this code as page.html in your assets folder.
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
<meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1, user-scalable=0">
<style type="text/css">
// your css code here
</style>
</head>
<body>
${body}
</body>
</html>
then in your java code:
String pageBody; // get page body by httpUrlConnection or okhttp or...
String html = FileUtils.readFromAssets("page.html", context);
// replace pageBody with ${body} in your html file
html = html.replace("${body}", pageBody);
WebView webView = (WebView) getView().findViewById(R.id.webView);
webView.getSettings().setAllowFileAccess(true);
WebSettings settings = webView.getSettings();
settings.setDefaultTextEncodingName("utf-8");
settings.setJavaScriptEnabled(true);
webView.loadDataWithBaseURL("file:///android_asset/", html, "text/html", "utf-8", null);
I'm devloping an apk to display some web pages by using webview.
The web pages have two size:
640*530
<meta name="page-view-size" content="640*530" />
it's diaplayed like this
1280*720
<meta name="page-view-size" content="1280*720" />
it's now displayed full screen
How can i display all size pages in fullscreen with one webview?
The device is version is Android 4.4.2
I've tried these methods:
WebSettings webSettings = mWebView.getSettings();
webSettings.setSavePassword(false);
webSettings.setSaveFormData(false);
webSettings.setJavaScriptEnabled(true);
webSettings.setPluginState(PluginState.ON);
webSettings.setSupportZoom(true);
webSettings.setLoadWithOverviewMode(true);
webSettings.setUseWideViewPort(true);
neither one is work for me.
Thanks.
you can try this for your web page header:
<meta id="viewport" name="viewport" width="initial-scale=1, maximum-scale=1, minimum-scale=1, user-scalable=no">
Using Android Studio and avd emulator. css defintely loading, js will execute from within head or attached to body tag, but not from external file in assets.
My MainActivity:
WebView webview = new WebView(this);
webview.setWebChromeClient(new WebChromeClient());
WebSettings webSettings = webview.getSettings();
webSettings.setJavaScriptEnabled(true);
webSettings.setAllowUniversalAccessFromFileURLs(true);
webSettings.setAllowFileAccessFromFileURLs(true);
webview.loadDataWithBaseURL("file:///android_asset/", html, "text/html", "UTF-8", null);
setContentView(webview);
My html head:
<link rel="stylesheet" href="my.css" />
<script src="jquery.mobile.min.js" type="text/javascript" />
<script src="my.js" type="text/javascript" />
Test JS (no jquery) that executes in head but not in external my.js:
function var1() {
document.getElementById('jstest').innerHTML = 'hi';
}
window.onload = var1;
My Current sentiment:
Charlie Brown.
Changing to jquery.min.js and getting rid of the mobile version has resolved everything. It probably sent the entire js into tilt, but the inline was processing first.
I have a js game code which I am showing in a webview. The code is defined such that it takes up the entire html page template, and when I pull it in a webview, I adjust the size accordingly.However, it zooms on double taps, which makes it difficult to play the game.How do I prevent it from zooming. Also, is there a way to speed up the performance, as the game is extremely slow and not ideal right now.
Here's the code for the webview:
requestWindowFeature(Window.FEATURE_NO_TITLE);
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);
setContentView(R.layout.main);
WebView webview = (WebView)findViewById(R.id.webview);
webview.setInitialScale(1);
webview.getSettings().setJavaScriptEnabled(true);
webview.getSettings().setLoadWithOverviewMode(true);
webview.getSettings().setUseWideViewPort(true);
webview.setScrollBarStyle(WebView.SCROLLBARS_OUTSIDE_OVERLAY);
webview.setScrollbarFadingEnabled(false);
// webview.getSettings().setRenderPriority(RenderPriority.HIGH);
// webview.getSettings().setCacheMode(WebSettings.LOAD_NO_CACHE);
webview.loadUrl("file:///android_asset/index.htm");
//webview.getSettings().setBuiltInZoomControls(true);
webview.getSettings().setSupportZoom(false);
Thanks,
Brian
My HTML Code bit :
<html>
<head>
<meta charset="utf-8">
//meta data tag below
<meta name="viewport" content="width=device-width,... etc>
<title>Dino Dragon </title>
<link rel="stylesheet" href="css/main.css">
</head>
<body>
Have you placed in the beginning of your HTML document the following definition:
<meta name="viewport"
content="width=device-width, initial-scale=1, maximum-scale=1, user-scalable=no">
This could prevent the webview from 'zooming in'.
You might need to extend a customized webview and override the onTouchEvent method.
And in the event callback, call setSupportZoom(false). Something like this:
#Override
public boolean onTouchEvent(MotionEvent ev) {
getSettings().setSupportZoom(false);
return super.onTouchEvent(ev);
}
Use instead of
webView.getSettings().setUseWideViewPort(true); to
webView.getSettings().setUseWideViewPort(false);