int pixelColor = bitmapImage.getPixel(10, 10);

        int pixelAlpha=   Color.alpha(pixelColor);
        int red =   65;// represent character A
        int green=    Color.green(pixelColor);
        int blue=    Color.blue(pixelColor);

        int new_pixel= Color.argb(pixelAlpha, red, green, blue);

        bitmapImage.setPixel(10, 10, new_pixel);

String data="";
       int pixelColor = bitmapImage.getPixel(10,10);
       int red =  Color.red(pixelColor);
       data+=(char)red;

       Toast.makeText(this, "Data:  "+data , 20).show();

public void saveImage(Bitmap bitmapImage,String name) throws IOException
{
    ByteArrayOutputStream bytes = new ByteArrayOutputStream();
    bitmapImage.compress(Bitmap.CompressFormat.JPEG, 100, bytes);


    String fName="/mnt/sdcard/pictures/"+name+".jpg";
    File f = new File(fName);
    f.createNewFile();


    FileOutputStream fo = new FileOutputStream(f);
    fo.write(bytes.toByteArray());
    fo.flush();
    fo.close();

}
 private Bitmap HideMessage(Bitmap src)
 {

       Bitmap dest = Bitmap.createBitmap(src.getWidth(), src.getHeight(), src.getConfig());


        for(int x = 0; x < src.getWidth(); x++)
        {
            for(int y = 0; y < src.getHeight(); y++)
            {
                dest.setPixel(x, y, src.getPixel(x, y));
            }
        }

        int pixelColor = src.getPixel(10, 10);

        int pixelAlpha=   Color.alpha(pixelColor);
        int red =   65;// represent character A
        int green=    Color.green(pixelColor);
        int blue=    Color.blue(pixelColor);

        int new_pixel= Color.argb(pixelAlpha, red, green, blue);

        dest.setPixel(10, 10, new_pixel);

        return dest;
       }

 public void Hide()
 {

     Bitmap dest = HideMessage(image);
        try
        {
            saveImage(dest,"hidden");
            Toast.makeText(this, "Message Hidden in Image and saved", Toast.LENGTH_LONG).show();
        }
        catch (IOException e)
        {
            Toast.makeText(this, e.toString(), Toast.LENGTH_LONG).show();
        }
 }
 public void Show_character()
 {
       Bitmap dest = BitmapFactory.decodeFile("/mnt/sdcard/pictures/hidden.jpg");

       String data= "";
       int pixelColor = dest.getPixel(10,10);
       int red =  Color.red(pixelColor);
       data+=(char)red;

       Toast.makeText(this, "Data:  "+data , 20).show();

  }