Java tutorial
//package com.java2s; import android.graphics.*; public class Main { public static Bitmap scale(Bitmap org, float xRate, float yRate) { final int orgWidth = org.getWidth(); final int orgHeight = org.getHeight(); Matrix matrix = new Matrix(); matrix.postScale(xRate, yRate); return Bitmap.createBitmap(org, 0, 0, orgWidth, orgHeight, matrix, true); } }