Java tutorial
//package com.java2s; //License from project: Apache License import android.content.res.Resources; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.support.annotation.DrawableRes; import android.support.annotation.NonNull; public class Main { public static Bitmap getSizedBitmap(@NonNull Resources res, @DrawableRes int resId, int desiredWidth) { // Load just the size of the image BitmapFactory.Options options = new BitmapFactory.Options(); options.inJustDecodeBounds = true; BitmapFactory.decodeResource(res, resId, options); // Options now has the bounds; prepare it for getting the actual image options.inSampleSize = 1; options.inJustDecodeBounds = false; if (options.outWidth > desiredWidth) { final int halfWidth = options.outWidth / 2; while (halfWidth / options.inSampleSize > desiredWidth) { options.inSampleSize *= 2; } } return BitmapFactory.decodeResource(res, resId, options); } }