Java tutorial
//package com.java2s; import android.graphics.Bitmap; import android.graphics.Matrix; public class Main { public static Bitmap scaleBitmap(Bitmap bitmap, float widthRatio, float heightRatio) { Matrix matrix = new Matrix(); matrix.postScale(widthRatio, heightRatio); return Bitmap.createBitmap(bitmap, 0, 0, bitmap.getWidth(), bitmap.getHeight(), matrix, true); } }