WebView 网页滚动截屏，可对整个网页进行截屏而不是仅当前屏幕哦！
注意若Web页面存在position:fixed; 的话得在调用前设置为 position:absolute; 哦，否则会出现很多次的，请看下面的具体解说吧！！
private static Bitmap getViewBitmapWithoutBottom(View v) {if (null == v) {return null;}v.setDrawingCacheEnabled(true);v.buildDrawingCache();if (Build.VERSION.SDK_INT >= 11) {v.measure(View.MeasureSpec.makeMeasureSpec(v.getWidth(), View.MeasureSpec.EXACTLY), View.MeasureSpec.makeMeasureSpec(v.getHeight(), View.MeasureSpec.EXACTLY));v.layout((int) v.getX(), (int) v.getY(), (int) v.getX() + v.getMeasuredWidth(), (int) v.getY() + v.getMeasuredHeight());} else {v.measure(View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED), View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED));v.layout(0, 0, v.getMeasuredWidth(), v.getMeasuredHeight());}Bitmap bp = Bitmap.createBitmap(v.getDrawingCache(), 0, 0, v.getMeasuredWidth(), v.getMeasuredHeight() - v.getPaddingBottom());v.setDrawingCacheEnabled(false);v.destroyDrawingCache();return bp;}public static Bitmap getViewBitmap(View v) {if (null == v) {return null;}v.setDrawingCacheEnabled(true);v.buildDrawingCache();if (Build.VERSION.SDK_INT >= 11) {v.measure(View.MeasureSpec.makeMeasureSpec(v.getWidth(), View.MeasureSpec.EXACTLY), View.MeasureSpec.makeMeasureSpec(v.getHeight(), View.MeasureSpec.EXACTLY));v.layout((int) v.getX(), (int) v.getY(), (int) v.getX() + v.getMeasuredWidth(), (int) v.getY() + v.getMeasuredHeight());} else {v.measure(View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED), View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED));v.layout(0, 0, v.getMeasuredWidth(), v.getMeasuredHeight());}Bitmap b = Bitmap.createBitmap(v.getDrawingCache(), 0, 0, v.getMeasuredWidth(), v.getMeasuredHeight());v.setDrawingCacheEnabled(false);v.destroyDrawingCache();return b;}/*** 获取 WebView 视图截图* @param context* @param view* @return*/public static Bitmap getWebViewBitmap(Context context, WebView view) {if (null == view) return null;view.scrollTo(0, 0);view.buildDrawingCache(true);view.setDrawingCacheEnabled(true);view.setVerticalScrollBarEnabled(false);Bitmap b = getViewBitmapWithoutBottom(view);// 可见高度int vh = view.getHeight();// 容器内容实际高度int th = (int)(view.getContentHeight()*view.getScale());Bitmap temp = null;if (th > vh) {int w = getScreenWidth(context);int absVh = vh - view.getPaddingTop() - view.getPaddingBottom();do {int restHeight = th - vh;if (restHeight <= absVh) {view.scrollBy(0, restHeight);vh += restHeight;temp = getViewBitmap(view);} else {view.scrollBy(0, absVh);vh += absVh;temp = getViewBitmapWithoutBottom(view);}b = mergeBitmap(vh, w, temp, 0, view.getScrollY(), b, 0, 0);} while (vh < th);}// 回滚到顶部view.scrollTo(0, 0);view.setVerticalScrollBarEnabled(true);view.setDrawingCacheEnabled(false);view.destroyDrawingCache();return b;}/*** 拼接图片* @param newImageH* @param newImageW* @param background* @param backX* @param backY* @param foreground* @param foreX* @param foreY* @return*/private static Bitmap mergeBitmap(int newImageH, int newImageW, Bitmap background, float backX, float backY, Bitmap foreground, float foreX, float foreY) {if (null == background || null == foreground) {return null;}Bitmap bitmap = Bitmap.createBitmap(newImageW, newImageH, Bitmap.Config.RGB_565);Canvas cv = new Canvas(bitmap);cv.drawBitmap(background, backX, backY, null);cv.drawBitmap(foreground, foreX, foreY, null);cv.save(Canvas.ALL_SAVE_FLAG);cv.restore();return bitmap;}/*** get the width of screen*/public static int getScreenWidth(Context ctx) {int w = 0;if (Build.VERSION.SDK_INT > 13) {Point p = new Point();((WindowManager) ctx.getSystemService(Context.WINDOW_SERVICE)).getDefaultDisplay().getSize(p);w = p.x;} else {w = ((WindowManager) ctx.getSystemService(Context.WINDOW_SERVICE)).getDefaultDisplay().getWidth();}return w;}/*** 保存图片* @param context* @param bitmap* @param file* @param quality* @return*/public static boolean save(Context context, Bitmap bitmap, File file, int quality) {if (bitmap == null) return false;// 获得后缀格式String abs = file.getAbsolutePath();String suffix = abs.substring(abs.lastIndexOf(".")+1).toLowerCase();Bitmap.CompressFormat format;if ("jpg".equals(suffix) || "jpeg".equals(suffix)) {format = Bitmap.CompressFormat.JPEG;} else {format = Bitmap.CompressFormat.PNG;quality = 100;}if (file.exists() && ! file.delete()) return false;try {FileOutputStream stream = new FileOutputStream(file);bitmap.compress(format, quality, stream);stream.flush();stream.close();context.sendBroadcast(new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE, Uri.fromFile(file)));return true;} catch (Exception e) {return false;}}JS调用截屏操作
/*** 屏幕截图* @param name* @param isRecover*/@JavascriptInterfacepublic String Capture(String name, boolean isRecover) {File dir = new File(Config.PUBLIC_PICTURES_PATH);LogUtil.i("capture", dir.getAbsolutePath());if (! dir.exists() && ! dir.mkdirs()) return null;final File file = new File(dir, name);String path = file.getAbsolutePath();if (file.exists() && ! isRecover) return path;body.post(new Runnable() {@Overridepublic void run() {Bitmap bitmap = CaptureUtil.getWebViewBitmap(activity, body);if (null != bitmap) ImageUtil.save(activity, bitmap, file, 100);}});return path;}@JavascriptInterfacepublic String Capture(String name) {return Capture(name, true);}@JavascriptInterfacepublic String Capture() {String name = String.valueOf(System.currentTimeMillis()) + ".png";return Capture(name);}
示例图：我先通过 JS 触发显示了一个原生的 Button按钮， 然后WebView跳转到 csdn 页面，然后点击截屏按钮用来触发网页截屏的。下面的图是我手动截的图，不是上面代码的效果哈，下下面很长的那张才是Java程序的网页截图。。。
测试CSDN的网页完整截图：比较长哦~ 一般截图的功能都用于特殊的页面，如活动页面之类的，不会太长，那样是没有问题的。若是这种滚动到底部自动加载的话可能就会很长很长很长啦·····，自己看着办吧。。
但这里有个BUG，顶部固定Banner条每次截屏都有，这个有解决办法，不过得是你自己的网页才有操作权限哦，需要修改JS啦。
当截图JS命令触发前，把顶部悬浮的样式设置为绝对定位，当截屏完成后再改回固定定位即可，没什么难度了。
截屏是需要一些时间的，所以需要预设一个定时器来操作，JS栗子如下:
JS.Capture 是 WebView 绑定的自定义 Javascript 类对象
var file = '';var $header = $("#layout-header");$header.css({ position: "absolute" });setTimeout(function(){if (typeof name == "function" || typeof name == "undefined") {file = JS.Capture();} else {file = JS.Capture(name, isRecover);}}, 500);setTimeout(function(){JS.Toast("截图已保存", "fast");JS.Toast(file.replace("storage/emulated/0/", ""));$header.css({ position: "fixed" });if ($.isFunction(callback)) {callback(file);}}, 1500);
