android webview 截图快照

方法一：

Picture snapShot = view.capturePicture();

           if (snapShot.getWidth() > 0 && snapShot.getHeight() > 0) {
               Bitmap b = Bitmap.createBitmap(snapShot.getWidth(),
                       snapShot.getHeight(), Bitmap.Config.ARGB_8888);

               Canvas c = new Canvas(b);

snapShot.draw(c);

Bitmap newBitmap = zoomBitmap(b, 250, 250);
historyModel.setSnapshot(newBitmap);

方法二（经过测试，平板竖屏是经常截图失败，原因是root.getDrawingCache()尺寸超过限制）：

View root = activity.getWindow().getDecorView();

    private Bitmap catchScreen(View root) {
       root.setDrawingCacheEnabled(true);
       root.setDrawingCacheBackgroundColor(0);
       root.buildDrawingCache(true);
       Bitmap b = root.getDrawingCache();
       return b;
   }

方法三（成功率高）：

            // create snapshot for webview
           View cv = activity.getWindow().getDecorView();
           Bitmap b = Bitmap.createBitmap(cv.getWidth(), cv.getHeight(),
                   Config.ARGB_4444);
           cv.draw(new Canvas(b));

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