webview图片缩放，字体大小设置，打电话

WebSettings webSettings = webview.getSettings();//支持javascript  webSettings.setJavaScriptEnabled(true);   // 设置可以支持缩放   webSettings.setSupportZoom(true);   // 设置出现缩放工具   webSettings.setBuiltInZoomControls(true);  //扩大比例的缩放  webSettings.setUseWideViewPort(true);  //自适应屏幕  webSettings.setLayoutAlgorithm(LayoutAlgorithm.SINGLE_COLUMN);  webSettings.setLoadWithOverviewMode(true);  webSettings.setTextSize(WebSettings.TextSize.LARGEST);
//有时候获取不到字体样式，需手动设置大小
android自带的五种字体大小：
       SMALLEST(50%), 
        SMALLER(75%),         NORMAL(100%),         LARGER(150%),         LARGEST(200%);
webSettings.setUseWideViewPort(true);webSettings.setLoadWithOverviewMode(true);
      webview.loadUrl(url);      webview.setWebViewClient(new WebViewClient() {                                    @Override                                    public boolean shouldOverrideUrlLoading(WebView view, String url) {                                        if (WebviewActivity.this == null) {                                            return false;                                        }                                        //调用拨号程序                                        if (url.startsWith("mailto:") || url.startsWith("geo:") || url.startsWith("tel:") || url.startsWith("smsto:")) {                                            //用intent启动拨打电话                                            Intent intent = new Intent(Intent.ACTION_CALL,Uri.parse(url));                                         startActivity(intent);                                            return true;                                        }                                        return false;                                    }                                });      webview.clearCache(true);      webview.clearHistory();