原

WebView web;
String url;
web.getSettings().setUseWideViewPort(true);
web.getSettings().setLoadWithOverviewMode(true);
web.getSettings().setDisplayZoomControls(false);
web.setVerticalScrollBarEnabled(false);
web.setHorizontalScrollBarEnabled(false);
web.getSettings().setLayoutAlgorithm(WebSettings.LayoutAlgorithm.SINGLE_COLUMN);
String data = "<img src=\""+url+"\" />";
web.loadUrl(url);
web.loadDataWithBaseURL("",data,"text/html", "UTF-8", "");

后

WebView web;
String url;
web.setVerticalScrollBarEnabled(false);
web.setHorizontalScrollBarEnabled(false);
web.getSettings().setJavaScriptEnabled(true);
web.getSettings().setUseWideViewPort(true);
web.getSettings().setLoadWithOverviewMode(true);
String data = "<p><img src=\""+url+"\" width=\"100%\""+" height=\"100%\""+"  /></p>";
web.loadUrl(url);
web.loadDataWithBaseURL("",data,"text/html", "UTF-8", "");

后 参考Showing Gravatar images in an Android app

ImageView img;
String url = "url_example";
new AsyncTask<String, Void, Bitmap>(){
    protected Bitmap doInBackground(String... params) {
        HttpURLConnection httpURLConnection = null;
        try{
            httpURLConnection = (HttpURLConnection) new URL(url).openConnection();
            final InputStream is = httpURLConnection.getInputStream();
            return BitmapFactory.decodeStream(is, null, new BitmapFactory.Options());
        }
        catch(Exception e) {
            e.printStackTrace();
        }
        finally {
            httpURLConnection.disconnect();
        }
        return null;
    }
    protected void onPostExecute(Bitmap bitmap) {
        img.setImageBitmap(bitmap);
    }
}.execute(grav);