Java tutorial
//package com.java2s; import android.graphics.Bitmap; import android.graphics.Matrix; public class Main { public static Bitmap scaleBitmapSoft(Bitmap temp, float scaleSize) { if (!canUse(temp)) { return null; } Matrix m = new Matrix(); m.postScale(scaleSize, scaleSize, 0, 0); return Bitmap.createBitmap(temp, 0, 0, temp.getWidth(), temp.getHeight(), m, true); } public static boolean canUse(Bitmap bmp) { return bmp != null && !bmp.isRecycled(); } }