AndroidGUI29：获取ImageView中的图像需要注意的问题(7)

           case R.id.btn_photo:

                    if(event.getAction() ==MotionEvent.ACTION_DOWN)

                   {

                             // ImageView对象(iv_photo)必须做如下设置后，才能获取其中的图像

                             iv_photo.setDrawingCacheEnabled(true);

                             // 获取ImageView中的图像

                             Bitmap sbmp =Bitmap.createBitmap(iv_photo.getDrawingCache());

                             // 从ImaggeView对象(iv_photo)中获取图像后，要记得调用setDrawingCacheEnabled(false)

                            // 清空画图缓冲区

                            iv_photo.setDrawingCacheEnabled(false);     

                             // 将得到sbmp写入文件

                             FileOutputStream  m_fileOutPutStream = null;

                             String filepath = Environment.getExternalStorageDirectory() +File.separator + "tempPhoto1.png";

                             try

                             {