WebView截图、截取整个网页

本次需求是要实现对WebView显示所有内容的截图 网上找了一通，基本上是实现了当前显示内容的截图，并非是整个页面的截图。

最终实现效果和代码如下所示，实现了本次WebView长截图的需求。 效果如下：

代码如下，主要是使用WebView.setDrawingCacheEnabled(),WebView.buildDrawingCache(),WebView.getDrawingCache(),View.scrollBy() 实现滑动截图，再拼接合成整张图片。

public class CaptureUtils {

    /**
     * 获取 当前屏幕显示区域 v 去除PaddingBottom的Bitmap对象
     *
     * @param v
     * @return
     */
    private static Bitmap getViewBitmapWithoutBottom(View v) {
        if (null == v) {
            return null;
        }
        v.setDrawingCacheEnabled(true);
        v.buildDrawingCache();
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
            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;
    }

    /**
     * 获取 当前屏幕显示区域 v 的Bitmap对象
     *
     * @param v
     * @return
     */
    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 视图长截图
     *
     * @param context
     * @param webView
     * @return
     */
    public static Bitmap getWebViewBitmap(Context context, WebView webView) {
        if (null == webView) return null;
        webView.scrollTo(0, 0);
        webView.buildDrawingCache(true);
        webView.setDrawingCacheEnabled(true);
        webView.setVerticalScrollBarEnabled(false);
        Bitmap b = getViewBitmapWithoutBottom(webView);
        // 可见高度
        int webViewHeight = webView.getHeight();
        // 容器内容实际高度
        int contentHeight = (int) (webView.getContentHeight() * webView.getScale());
        Bitmap temp;
        if (contentHeight > webViewHeight) {
            int screenWidth = getScreenWidth(context);
            int absVh = webViewHeight - webView.getPaddingTop() - webView.getPaddingBottom();
            do {
                int restHeight = contentHeight - webViewHeight;
                if (restHeight <= absVh) {
                    webView.scrollBy(0, restHeight);
                    webViewHeight += restHeight;
                    temp = getViewBitmap(webView);
                } else {
                    webView.scrollBy(0, absVh);
                    webViewHeight += absVh;
                    temp = getViewBitmapWithoutBottom(webView);
                }
                b = mergeBitmap(webViewHeight, screenWidth, temp, 0, webView.getScrollY(), b, 0, 0);
            } while (webViewHeight < contentHeight);
        }
        // 回滚到顶部
        webView.scrollTo(0, 0);
        webView.setVerticalScrollBarEnabled(true);
        webView.setDrawingCacheEnabled(false);
        webView.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;
    }

    /**
     * 获取屏幕宽度
     */
    public static int getScreenWidth(Context ctx) {
        int w;
        if (Build.VERSION.SDK_INT > Build.VERSION_CODES.HONEYCOMB_MR2) {
            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;
    }
}

图片保存代码：

private void takeCapture() {
    Bitmap bitmap = webViewFragment.captureWebView(); //获取webview 长截图，内部代码是上面代码所示，调用了CaptureUtils.getWebViewBitmap();
    String filePath = CachePathNew.getDCIMPath(activityInstance) + "线下支付_" + TimeUtils.getNowStringSimple() + ".jpg";
    File file = new File(filePath);
    FileOutputStream fos = null;
    try {
        fos = new FileOutputStream(file);
        bitmap.compress(Bitmap.CompressFormat.JPEG, 70, fos);
        ToastUtils.makeText("图片已保存到\n" + fileName);
        Intent intent = new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE);
        Uri uri = Uri.fromFile(file);
        intent.setData(uri);
        activityInstance.sendBroadcast(intent);
        notification(filePath);
        fos.flush();
        fos.close();
    } catch (Exception e) {
        e.printStackTrace();
        ToastUtils.makeText("保存失败");
        CloseUtils.closeIO(fos);
    }
}

发送notification，点击用系统图片浏览工具打开图片

private void notification(String filePath) {
    int indexS = filePath.indexOf("DCIM");
    String subFilePath;
    if (-1 != indexS) {
        subFilePath = filePath.substring(indexS - 1);
    } else {
        subFilePath = filePath;
    }
    NotificationManager manager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);

    File file = new File(filePath);
    Intent intent = new Intent(Intent.ACTION_VIEW);
    intent.setDataAndType(Uri.fromFile(file), "image/* ");
    PendingIntent pendingIntent = PendingIntent.getActivity(activityInstance, 0, intent, PendingIntent.FLAG_CANCEL_CURRENT);

    Notification.Builder builder = new Notification.Builder(activityInstance);
    builder.setSmallIcon(R.mipmap.ic_launcher)
            .setContentTitle("已保存订单截图信息")
            .setContentText(subFilePath)
            .setAutoCancel(true)
            .setContentIntent(pendingIntent);
    Notification notification;
    if (Build.VERSION.SDK_INT < Build.VERSION_CODES.JELLY_BEAN) {
        notification = builder.getNotification();
    } else {
        notification = builder.build();
    }
    manager.notify((int) System.currentTimeMillis(), notification);
}

通知效果如下