Question

I want to copy a picture from asstets folder and paste it in my package, just for test. but final image doesn’t show anything. when I want to open picture with paint, it says that “This is not a valid bitmap file”.

In my program, I start to read original image in this way:

private void copyImage()
{
    AssetManager am = getResources().getAssets();               
    try{
        image = BitmapFactory.decodeStream(am.open("tasnim.png"));
        imWidth  = image.getWidth();
        imHeight = image.getHeight();
    } 
    catch(IOException e){
        e.printStackTrace();
        System.out.println("Error accoured!");
    }
}

next, I’ll get pixels of image or extract pixels, and save pixels in array of integer (rgbstream).

private void getPixelsOfImage()
{
    rgbStream = new int[imWidth * imHeight];
    image.getPixels(rgbStream, 0, imWidth, 0, 0, imWidth, imHeight);
}

finally, I want to save it in my package,

private void createPicture()
{
    contextPath = context.getFilesDir().getAbsolutePath();
    String path = contextPath + "/" + picName;

    try{
        FileOutputStream fos = new FileOutputStream(path);
        DataOutputStream dos = new DataOutputStream(fos); 

        for(int i=0; i<rgbStream.length; i++)
            dos.writeByte(rgbStream[i]);

        dos.flush();
        dos.close();
        fos.close();
    }
    catch(IOException e){
        System.out.println("IOException : " + e);
    }
    System.out.println("Picture Created.");
}

Code works fine but result, nothing!!! 🙁
When I check DDMS it creates new file and store all pixels (because it shows the size of this file is 13300 and dimension of my original picture is 100*133). when I click “pull a file from the device” I can save it on my desktop. However, when I open it 🙂 nothing.

What you think? is there any problem in my code?
Thanks

Answer 1

I don’t know what your intent is – do you want to write out a raw image file?

Assuming that you want to write a JPEG or PNG or whatever, you can erase your entire code and do something a lot easier:

Bitmap image = BitmapFactory.decodeStream(am.open("tasnim.png"));
FileOutputStream fos = new FileOutputStream(path);
image.compress(Bitmap.CompressFormat.PNG, 100, fos);

With proper error checking of course.