Android WebView, Scaling Image to fit the screen
Its a bit late but I hope this will help, what you can do is:
String html = "<html><body><img src=\"" + URL + "\" width=\"100%\" height=\"100%\"\"/></body></html>";
mWebView.loadData(html, "text/html", null);
this will make the image exactly similar to your WebView's width, rest you can adjust the WebView itself.
You could also do something like this.
Add CSS style for img at the beginning (depends on your web data format) of your data string.
<style>img{display: inline; height: auto; max-width: 100%;}</style>
To quickly do it to data in WebView i did this.
WebView content = (WebView) findViewById(R.id.webView1);
content.loadDataWithBaseURL(null, "<style>img{display: inline;height: auto;max-width: 100%;}</style>" + post.getContent(), "text/html", "UTF-8", null);
It's pretty much like what bansal21ankit said, but instead it will work on every image in your HTML without extra work.
Edit (clarification on post content):
You can have any text/html value instead of post.getContent() from the example.
Post content here is just an example of a text/html content which is loaded from some data source and then concatenated with the style part which makes any image in given content to fit the screen.
I had the same issue and doing this worked just fine:
Display display = getWindowManager().getDefaultDisplay();
int width = display.getWidth();
String data = "<html><head><title>Example</title><meta name=\"viewport\"\"content=\"width="+width+", initial-scale=0.65 \" /></head>";
data = data + "<body><center><img width=\""+width+"\" src=\""+url+"\" /></center></body></html>";
webView.loadData(data, "text/html", null);
Edit: As this remained as the accepted answer, here is a better solution (all credit to Tony below):
WebView content = (WebView) findViewById(R.id.webView1);
content.loadDataWithBaseURL(null, "<style>img{display: inline;height: auto;max-width: 100%;}</style>" + post.getContent(), "text/html", "UTF-8", null);
you should scale the webView to fit the screen:
WebView data = (WebView) getViewById(R.id.webview1);
data.getSettings().setLoadWithOverviewMode(true);
data.getSettings().setUseWideViewPort(true);