Java tutorial
//package com.java2s; //License from project: Apache License import android.graphics.BitmapFactory; public class Main { private static int calculateInSampleSize(BitmapFactory.Options options, int reqWidth, int reqHeight) { // Raw height and width of image final int height = options.outHeight; final int width = options.outWidth; int inSampleSize = 1; if (height > reqHeight || width > reqWidth) { // Calculate ratios of height and width to requested height and width final int heightRatio = Math.round((float) height / (float) reqHeight); final int widthRatio = Math.round((float) width / (float) reqWidth); // Choose the smallest ratio as inSampleSize value, this will guarantee // a final image with both dimensions larger than or equal to the requested height and width. inSampleSize = heightRatio < widthRatio ? widthRatio : heightRatio; } return inSampleSize; } }