Android(安卓)bitmap 图片缩放，压缩处理

大家都知道在Android平台上，显示图片时，容易出现bitmap outofmemory除了，对即使的回收bitmap，还有个方法，就是在使用前提前对图片进行处理

对图片进行缩放同时也减小了bitmap的大小

/** * 缩放，压缩图片 * @param picPath * @param width * @param height * @return */public InputStream revitionPic(String picPath, int width, int height) {BitmapFactory.Options options = new BitmapFactory.Options();options.inJustDecodeBounds = true;BitmapFactory.decodeFile(picPath, options);options.inSampleSize = calcRatios(options, width, height);options.inJustDecodeBounds = false;Bitmap bitmap = BitmapFactory.decodeFile(picPath, options);                //进一步较小图片的大小return compressPic(bitmap);}

计算缩放尺寸缩放比例

/** * 计算缩放比例 * @param options * @param width * @param height * @return */protected int calcRatios(BitmapFactory.Options options, int width, int height) {int origalWidth = options.outWidth;int origalHeight = options.outHeight;int inSampleSize = 1;if(origalHeight > height || origalWidth > width) {int heightRatios = Math.round(((float)origalHeight / (float)height));int widthRatios = Math.round((float)origalWidth /(float)width);inSampleSize = heightRatios > widthRatios ? widthRatios : heightRatios;}return inSampleSize;}

压缩图片

/** * 压缩图片  * @param pic * @return */public InputStream compressPic(Bitmap pic) {ByteArrayOutputStream baos = new ByteArrayOutputStream();pic.compress(CompressFormat.JPEG, 100, baos);int quality = 100;while(quality > 0 && baos.toByteArray().length / 1024 > 100) {//大于100kbaos.reset();quality -= 5;pic.compress(CompressFormat.JPEG, quality, baos);}return new ByteArrayInputStream(baos.toByteArray());}

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