Java tutorial
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We also recommend that a * file or class name and description of purpose be included on the * same "printed page" as the copyright notice for easier * identification within third-party archives. * <p/> * Copyright {2015} {CJstar} * <p/> * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * <p/> * http://www.apache.org/licenses/LICENSE-2.0 * <p/> * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ import android.content.res.Resources; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.util.Log; public class Main { private static String TAG = "ImageLoaderUtils"; /** * Load bitmap from resources * * @param resources resource * @param drawableId resource image id * @param imgH destination image height * @param imgW destination image width * @return */ public static Bitmap loadHugeBitmapFromDrawable(Resources resources, int drawableId, int imgH, int imgW) { Log.d(TAG, "imgH:" + imgH + " imgW:" + imgW); BitmapFactory.Options options = new BitmapFactory.Options(); //preload set inJustDecodeBounds true, this will load bitmap into memory options.inJustDecodeBounds = true; //options.inPreferredConfig = Bitmap.Config.ARGB_8888;//default is Bitmap.Config.ARGB_8888 BitmapFactory.decodeResource(resources, drawableId, options); //get the image information include: height and width int height = options.outHeight; int width = options.outWidth; String mimeType = options.outMimeType; Log.d(TAG, "width:" + width + " height:" + height + " mimeType:" + mimeType); //get sample size int sampleSize = getScaleInSampleSize(width, height, imgW, imgH); options.inSampleSize = sampleSize; // Decode bitmap with inSampleSize set options.inJustDecodeBounds = false; Log.d(TAG, "memory size:" + getBitmapSizeInMemory(width / sampleSize, height / sampleSize)); Bitmap bitmap = BitmapFactory.decodeResource(resources, drawableId, options); Log.d(TAG, "w=" + bitmap.getWidth() + " h=" + bitmap.getHeight() + " bitmap size:" + bitmap.getRowBytes() * bitmap.getHeight()); return bitmap; } /** * get the scale sample size * * @param resW resource width * @param resH resource height * @param desW result width * @param desH result height * @return */ public static int getScaleInSampleSize(int resW, int resH, int desW, int desH) { if (desH == 0 || desW == 0) { return 2;//default size } int scaleW = resW / desW; int scaleH = resH / desH; int largeScale = scaleH > scaleW ? scaleH : scaleW; int sampleSize = 1; while (sampleSize < largeScale) { sampleSize *= 2; } Log.d(TAG, "sampleSize:" + sampleSize); return sampleSize; } /** * get the image size in the RAM * * @param imageW * @param imageH * @return */ public static long getBitmapSizeInMemory(int imageW, int imageH) { return imageH * imageW * getBytesPerPixel(Bitmap.Config.ARGB_8888); } /** * A helper function to return the byte usage per pixel of a bitmap based on its configuration. */ public static int getBytesPerPixel(Bitmap.Config config) { if (config == Bitmap.Config.ARGB_8888) { return 4; } else if (config == Bitmap.Config.RGB_565) { return 2; } else if (config == Bitmap.Config.ARGB_4444) { return 2; } else if (config == Bitmap.Config.ALPHA_8) { return 1; } return 1; } }