CODEWITHSUNDEEP
androidbitmap
Droidman
Droidman

Reputation: 11608

how to crop a Bitmap so it matches the screen size

Starting point: in my app I let the user pick an image that will be used as the app's background. In case the image's width/height is larger than the device's screen width/height, I want to crop the image so it matches the device dimensions (see picture below).

enter image description here

I tried the method below, but with no luck at all, the resulting image is messed up. 

    private Bitmap crop(Bitmap bmp) {
    int centerW = bmp.getWidth() / 2;
    int centerH = bmp.getHeight() / 2;
    int startX = centerW
            //returns screen width
            - GetSettings.getScreenDimensions(getActivity())[0] / 2;
    int startY = centerH
            //returns screen height
            - GetSettings.getScreenDimensions(getActivity())[1] / 2;

    return Bitmap.createBitmap(bmp, startX, startY,
            GetSettings.getScreenDimensions(getActivity())[0],
            GetSettings.getScreenDimensions(getActivity())[1]);

}

I guess I'm misunderstanding the parameters I need to pass to the createBitmap() method to get a proper result.

So how can I crop a Bitmap to make it's width/height to match the screen's width/height?

Upvotes: 0

Views: 1611

Answers (1)

Alex311
Alex311

Reputation: 378

I'm not an android developer, but I would imagine your startX and startY variables are incorrect.

I would think you would want something like this:

startX = (bmp.getWidth() - screenWidth) / 2;
startY = (bmp.getHeight() - screenHeight) / 2;

Then your draw X and Y lengths would just be the screen width and height.

Upvotes: 2

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