CODEWITHSUNDEEP
androidandroid-image
Aerrow
Aerrow

Reputation: 12134

How to resize image with custom size

I need to resize my image with custom size. The image is taken from device camera or gallery, i tired the below code, but the image is stretched, i need the image in square shape with out any stretch.

public Bitmap decodeSampledBitmapFromFile(Bitmap bm, int boundBoxInDp) {
boundBoxInDp=300;
        int height = bm.getHeight();
        int width = bm.getWidth();
        float scaleWidth = ((float) boundBoxInDp) / width;
        float scaleHeight = ((float) boundBoxInDp) / height;
        Matrix matrix = new Matrix();
        matrix.postScale(scaleWidth, scaleHeight);
        Bitmap resizedBitmap = Bitmap.createBitmap(bm, 0, 0, width, height,
                matrix, false);
        return resizedBitmap;

    }

Upvotes: 2

Views: 2164

Answers (3)

nightfixed
nightfixed

Reputation: 841

Take a look at https://github.com/coomar2841/image-chooser-library/blob/d27b542d2487132b0150be382f39e9ef95aafe68/src/com/kbeanie/imagechooser/threads/MediaProcessorThread.java.

The method called compressAndSaveImage.

Upvotes: 0

Tom
Tom

Reputation: 1793

This won't fit your image in a bounding box (the failure of which is presumably what you're calling "stretch"). It will not handle rectangular bitmaps in your square bounding box, nor will it handle images smaller than the bounding box particularly well. You probably want something like:

public Bitmap decodeSampledBitmapFromFile(Bitmap bm, int boundBoxInDp) {
    boundSquareInPx=convertToPixels(300);
    int maxDimen = Math.max(bm.getHeight(), bm.getWidth())
    float scale = (maxDimen <= boundSquareInPx) ? 1 : boundSquareInPx / (float) maxDimen;
    float scaleWidth = scale * bm.getWidth();
    float scaleHeight = scale * bm.getHeight();
    Matrix matrix = new Matrix();
    matrix.postScale(scaleWidth, scaleHeight);
    Bitmap resizedBitmap = Bitmap.createBitmap(bm, 0, 0, width, height,
            matrix, true);
    return resizedBitmap;

}

Few notes: if you image is smaller than your bound it won't fit it- obvious modifications do that.

Secondly, dp != px; the Bitmap object returns px, so you're going to have to convert to px from dp (which is well documented elsewhere).

Use postTranslate(...) if you need to center the correspondingly cropped bitmap.

The documentation is here; this is allready the best library I know for resizing in Android- I've never needed anything else, and I've been in the game a while and work with this frequently.

If you need, in my opinion, the best introduction to working with the API efficiently: read the source code to ImageView and Drawable instances; a really worthwhile personal development exercise would be to use the SDK to implement a fading transition drawable that is center cropped, as that's rather annoyingly one of the only things missing from the Android library, and would involve a heck of a lot of the kind of coding you're trying to do above.

NB:

As you'll note, another answerer has pointed out the existence of createScaledBitmap, which is probably much clearer code; I just wanted to point out how what you were doing was basically right and how it could be improved.

Best.

Upvotes: 1

Hemantvc
Hemantvc

Reputation: 2119

If you already have a bitmap, you could use the following code to resize:

Bitmap originalBitmap = <original initialization>;

Bitmap resizedBitmap = Bitmap.createScaledBitmap(originalBitmap, newWidth, newHeight, false);

Or you can use following library for resize image

https://github.com/biokys/cropimage

Upvotes: 1

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