Java tutorial
//package com.java2s; import android.graphics.Bitmap; import android.graphics.Matrix; public class Main { public static Bitmap resizeBitmap(Bitmap bm, float scale) { Matrix matrix = new Matrix(); matrix.postScale(scale, scale); return Bitmap.createBitmap(bm, 0, 0, bm.getWidth(), bm.getHeight(), matrix, true); } public static Bitmap resizeBitmap(Bitmap bm, int w, int h) { Bitmap BitmapOrg = bm; int width = BitmapOrg.getWidth(); int height = BitmapOrg.getHeight(); float scaleWidth = ((float) w) / width; float scaleHeight = ((float) h) / height; Matrix matrix = new Matrix(); matrix.postScale(scaleWidth, scaleHeight); return Bitmap.createBitmap(BitmapOrg, 0, 0, width, height, matrix, true); } }