I want to edit PNG file. But i can't it. Please tell me.

Question

public void Database()
      try
                        InputStream inputstream1 = getClass().getResourceAsStream(name1);               
     InputStream inputstream2 = getClass().getResourceAsStream(name2);
     int ch;
     int index = 0;
     int len1 = inputstream1.available();
     int len2 = inputstream2.available();
     System.out.println("\n"+name1+"  "+len1);
     data1 = new byte[len1];               
     while ((ch = inputstream1.read()) != -1)
     data1[index] = (byte)ch;
     index++;
     System.out.println("\n"+index+"\n\n");
     inputstream1.close();
          catch(Exception e)
             e.printStackTrace();
}i can get byte of file. but i can't edit file pic to png file

Answer 1

If these are images that are completely under your control you could not store them as pngs, but instead create your own format, where you just store them as an array of pixels in RGB format (probably with a small header to include genreal information like the dimensions), something similar to BMP. When you load the image you wouldn't be using the Image.createImage() methods, but instead write your own method that creates a blank image and draws in the colors. This will allow you to edit the pictures any way you please even on MIDP 1.0 phones without any proprietary APIs. It means you would need to write a tool to export images in the format you create.
If you limit yourself to MIDP 2.0 then you could just load the image and use the getRGB() and createRGBImage() methods to manipulate pixels. With MIDP 1.0 you could also do this on certain phones, if they have extension APIs like Nokia's DirectGraphics class for example.
shmoove