Java tutorial
//package com.java2s; //License from project: Open Source License import android.content.res.Resources; import android.graphics.Bitmap; import android.graphics.BitmapFactory; public class Main { /** * Decode and sample down a bitmap from resources to the requested width and height. * * @param res The resources object containing the image data * @param resId The resource id of the image data * @param reqWidth The requested width of the resulting bitmap * @param reqHeight The requested height of the resulting bitmap * @return A bitmap sampled down from the original with the same aspect ratio and dimensions * that are equal to or greater than the requested width and height */ public static Bitmap decodeSampledBitmapFromResource(Resources res, int resId, int reqWidth, int reqHeight) { // BEGIN_INCLUDE (read_bitmap_dimensions) // First decode with inJustDecodeBounds=true to check dimensions final BitmapFactory.Options options = new BitmapFactory.Options(); options.inJustDecodeBounds = true; BitmapFactory.decodeResource(res, resId, options); // Calculate inSampleSize options.inSampleSize = calculateInSampleSize(options, reqWidth, reqHeight); // END_INCLUDE (read_bitmap_dimensions) // Decode bitmap with inSampleSize set options.inJustDecodeBounds = false; return BitmapFactory.decodeResource(res, resId, options); } /** * Calculate an inSampleSize for use in a {@link BitmapFactory.Options} object when decoding * bitmaps using the decode* methods from {@link BitmapFactory}. This implementation calculates * the closest inSampleSize that is a power of 2 and will result in the final decoded bitmap * having a width and height equal to or larger than the requested width and height. * * @param options An options object with out* params already populated (run through a decode* * method with inJustDecodeBounds==true * @param reqWidth The requested width of the resulting bitmap * @param reqHeight The requested height of the resulting bitmap * @return The value to be used for inSampleSize */ public static int calculateInSampleSize(BitmapFactory.Options options, int reqWidth, int reqHeight) { // BEGIN_INCLUDE (calculate_sample_size) // Raw height and width of image final int height = options.outHeight; final int width = options.outWidth; int inSampleSize = 1; if (height > reqHeight || width > reqWidth) { final int halfHeight = height / 2; final int halfWidth = width / 2; // Calculate the largest inSampleSize value that is a power of 2 and keeps both // height and width larger than the requested height and width. while ((halfHeight / inSampleSize) > reqHeight && (halfWidth / inSampleSize) > reqWidth) { inSampleSize *= 2; } // This offers some additional logic in case the image has a strange // aspect ratio. For example, a panorama may have a much larger // width than height. In these cases the total pixels might still // end up being too large to fit comfortably in memory, so we should // be more aggressive with sample down the image (=larger inSampleSize). long totalPixels = width * height / inSampleSize; // Anything more than 2x the requested pixels we'll sample down further final long totalReqPixelsCap = reqWidth * reqHeight * 2; while (totalPixels > totalReqPixelsCap) { inSampleSize *= 2; totalPixels /= 2; } } return inSampleSize; // END_INCLUDE (calculate_sample_size) } }