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