Java tutorial
//package com.java2s; import android.graphics.Bitmap; import android.graphics.Matrix; public class Main { private static Bitmap createScaledBitmap(Bitmap bitmap, float scale, int width, int height) { if (bitmap == null) { return null; } Matrix matrix = new Matrix(); matrix.postScale(scale, scale); Bitmap scaledBitmap = Bitmap.createBitmap(bitmap, 0, 0, width, height, matrix, true); return scaledBitmap; } }