/**
	 * 圖片轉成string
	 * 
	 * @param bitmap
	 * @return
	 */
	public static String convertIconToString(Bitmap bitmap)
	{
		ByteArrayOutputStream baos = new ByteArrayOutputStream();// outputstream
		bitmap.compress(CompressFormat.PNG, 100, baos);
		byte[] appicon = baos.toByteArray();// 轉為byte陣列
		return Base64.encodeToString(appicon, Base64.DEFAULT);

	}

	/**
	 * string轉成bitmap
	 * 
	 * @param st
	 */
	public static Bitmap convertStringToIcon(String st)
	{
		// OutputStream out;
		Bitmap bitmap = null;
		try
		{
			// out = new FileOutputStream("/sdcard/aa.jpg");
			byte[] bitmapArray;
			bitmapArray = Base64.decode(st, Base64.DEFAULT);
			bitmap =
					BitmapFactory.decodeByteArray(bitmapArray, 0,
							bitmapArray.length);
			// bitmap.compress(Bitmap.CompressFormat.PNG, 100, out);
			return bitmap;
		}
		catch (Exception e)
		{
			return null;
		}
	}