Picture专成Bitmap并保存到sd卡

 Bitmap  b = Bitmap.createBitmap( picture.getWidth(), picture.getHeight(), Bitmap.Config.ARGB_8888);

                Canvas c = new Canvas( b );

                picture.draw( c );

                FileOutputStream fos = null;

                try {

                        fos = new FileOutputStream( "/sdcard/yahoo_" +
System.currentTimeMillis() + ".jpg" );

                        if ( fos != null )
                        {
                                b.compress(Bitmap.CompressFormat.JPEG, 90, fos );

                                fos.close();
                        }

                } catch( Exception e )
                        {
                        //...
                        }
                }
          });