Question

I have 45 buttons which i have created by loop in java code. Now i need to set and change the background image depending on the user interaction and also need resize the image also depending on the button. It will be help-full for me if i can do everything for an image button in java.

How i can resize the background image of a button in java code.

Answer 1

If you want to resize an image on basis of the dimension of a Button, use getHeight() and getWidth() methods to get the size of the button and use following function to resize image for Button:

Resizing a Bitmap:

public Bitmap getResizedBitmap(Bitmap bm, int newHeight, int newWidth) {

int width = bm.getWidth();

int height = bm.getHeight();

float scaleWidth = ((float) newWidth) / width;

float scaleHeight = ((float) newHeight) / height;

// create a matrix for the manipulation

Matrix matrix = new Matrix();

// resize the bit map

matrix.postScale(scaleWidth, scaleHeight);

// recreate the new Bitmap

Bitmap resizedBitmap = Bitmap.createBitmap(bm, 0, 0, width, height, matrix, false);

return resizedBitmap;

}

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Now you can use setBackgroundDrawable() or setBackgroundResource() methods on a Button object to change its Background Image and you can resize a Button via setHeight() and setWidth() methods.
Reference