方法一：
01.
Picture snapShot = view.capturePicture();
02.
03.
04.
if (snapShot.getWidth() > 0 && snapShot.getHeight() > 0) {
05.
Bitmap b = Bitmap.createBitmap(snapShot.getWidth(),
06.
snapShot.getHeight(), Bitmap.Config.ARGB_8888);
07.
08.
Canvas c = new Canvas(b);
09.
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snapShot.draw(c);
11.
12.
Bitmap newBitmap = zoomBitmap(b, 250, 250);
13.
historyModel.setSnapshot(newBitmap);
方法二（經過測試，平板豎屏是經常截圖失敗， 原因是root.getDrawingCache()尺寸超過限制）：
01.
View root = activity.getWindow().getDecorView();
02.
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private Bitmap catchScreen(View root) {
05.
root.setDrawingCacheEnabled(true);
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root.setDrawingCacheBackgroundColor(0);
07.
root.buildDrawingCache(true);
08.
Bitmap b = root.getDrawingCache();
09.
return b;
10.
}
方法三（成功率高）：
1.
// create snapshot for webview
2.
View cv = activity.getWindow().getDecorView();
3.
Bitmap b = Bitmap.createBitmap(cv.getWidth(), cv.getHeight(),
4.
Config.ARGB_4444);
5.
cv.draw(new Canvas(b));
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