Java tutorial
//package com.java2s; import android.graphics.Bitmap; import android.graphics.Matrix; public class Main { public static Bitmap big(Bitmap bitmap, float scale) { if (bitmap == null) { return null; } Matrix matrix = new Matrix(); matrix.postScale(scale, scale); Bitmap resizeBmp = Bitmap.createBitmap(bitmap, 0, 0, bitmap.getWidth(), bitmap.getHeight(), matrix, true); if (!bitmap.isRecycled()) { bitmap.recycle(); } return resizeBmp; } }