CODEWITHSUNDEEP
androidbitmap
Yarh
Yarh

Reputation: 4627

Cannot rescale bitmap

I am tring to implement "extend" button to fit image into chosen boundaries.

public void extendS(View v){
        ImageView iv = current;
        double width = gallery.getWidth();
        double hight= gallery.getHeight();

        double aspect = (width+0)/(hight+0);
        Log.d("aspect", "w: "+width+" h: "+hight+" a: "+aspect);
        if (aspect>1){
            hight/=aspect;
        }else{
            width*=aspect;
        }
        Bitmap b = ((BitmapDrawable) iv.getDrawable()).getBitmap();
//      Matrix matrix = new Matrix();
        Log.d("aspect", "w: "+width+" h: "+hight+" a: "+aspect);
         Bitmap scale = Bitmap.createBitmap(b, 0, 0, (int)width, (int)hight);
         iv.setImageBitmap(scale);

Error which I recieve: 07-16 12:26:36.855: E/AndroidRuntime(12647): Caused by: java.lang.IllegalArgumentException: y + height must be <= bitmap.height() this error seems a bit wierd from my point of view

Upvotes: 0

Views: 137

Answers (2)

Logan Pickup
Logan Pickup

Reputation: 2374

You're getting this error because you're trying to access data outside the original bitmap's area. You're actually very close, you're just using the wrong Bitmap.createBitmap() function. Try this to create a bitmap from the original source with a different size:

Bitmap.createScaledBitmap(b, (int)width, (int)hight, true);

Also, you're doing the aspect ratio wrong. Hint: you don't need to worry about aspect ratio with this code.

Upvotes: 1

Muhammad Aamir Ali
Muhammad Aamir Ali

Reputation: 21117

public static Bitmap resizeBitmap(Bitmap photo, float x, float y) {

    try {
        // get current bitmap width and height
        int width = photo.getWidth();
        int height = photo.getHeight();

        // determine how much to scale
        float scaleWidth = x / width;
        float scaleHeight = y / height;

        // create the matrix for the manipulation
        Matrix matrix = new Matrix();
        // resize the bitmap
        matrix.postScale(scaleWidth, scaleHeight);

        // recreate the new bitmap
        Bitmap resizebitmap = Bitmap.createBitmap(photo, 0, 0, width,
                height, matrix, false);
        return resizebitmap;

    } catch (NullPointerException e) {
        e.printStackTrace();
    } catch (OutOfMemoryError e) {
        e.printStackTrace();
        System.gc();
    }
    return null;
}

Upvotes: 1

Related Questions