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//获取Picture对象
Picture picture = wv_capture.capturePicture();
//得到图片的宽和高(没有reflect图片内容)
int width = picture.getWidth();
int height = picture.getHeight();
if (width > 0 && height > 0) {
//创建位图
Bitmap bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
Canvas canvas = new Canvas(bitmap);
//绘制(会调用native方法,完成图形绘制)
picture.draw(canvas);
}