内存溢出应对:把图片固定大小赋值给bitmap

来源：互联网发布：海湾编程软件下载编辑：程序博客网时间：2024/05/16 09:26
主题://将绝对路径转换为Bitmap,动态计算inSampleSize限制图片大小此处大小为128*128 RGB_565(默认为8888)下为 2.7K    public static Bitmap getFixedSizeImg(String filePath){        Bitmap bitmap = null;        BitmapFactory.Options opts = new BitmapFactory.Options();        opts.inJustDecodeBounds = true;        opts.inPreferredConfig = Bitmap.Config.RGB_565;        opts.inPurgeable = true;        opts.inInputShareable = true;        BitmapFactory.decodeFile(filePath, opts);        opts.inSampleSize = computeSampleSize(opts, -1, 128*128);        opts.inJustDecodeBounds = false;        try {            bitmap = BitmapFactory.decodeFile(filePath, opts);        }catch (Exception e) {            // TODO: handle exception        }        return bitmap;    }//计算inSampleSize    public static int computeSampleSize(BitmapFactory.Options options, int minSideLength, int maxNumOfPixels) {        int initialSize = computeInitialSampleSize(options, minSideLength, maxNumOfPixels);        int roundedSize;        if (initialSize <= 8) {            roundedSize = 1;            while (roundedSize < initialSize) {                roundedSize <<= 1;            }        } else {            roundedSize = (initialSize + 7) / 8 * 8;        }        return roundedSize;    }//计算inSampleSize    private static int computeInitialSampleSize(BitmapFactory.Options options,int minSideLength, int maxNumOfPixels) {        double w = options.outWidth;        double h = options.outHeight;        int lowerBound = (maxNumOfPixels == -1) ? 1 : (int) Math.ceil(Math.sqrt(w * h / maxNumOfPixels));        int upperBound = (minSideLength == -1) ? 128 :(int) Math.min(Math.floor(w / minSideLength), Math.floor(h / minSideLength));        if (upperBound < lowerBound) {            // return the larger one when there is no overlapping zone.            return lowerBound;        }        if ((maxNumOfPixels == -1) && (minSideLength == -1)) {            return 1;        } else if (minSideLength == -1) {            return lowerBound;        } else {            return upperBound;        }    }主题结束重写Activity此方法可查看app内存状态@Overridepublic void onTrimMemory(int level) {    super.onTrimMemory(level);    switch (level) {        case TRIM_MEMORY_RUNNING_MODERATE:            LongLog.loge("你的app正在运行并且不会被列为可杀死的");            break;        case TRIM_MEMORY_RUNNING_LOW:            LongLog.loge("你的app正在运行且没有被列为可杀死的");            break;        case TRIM_MEMORY_RUNNING_CRITICAL:            LongLog.loge("你的app仍在运行，但是系统已经把LRU Cache中的大多数进程都已经杀死");            break;        case TRIM_MEMORY_BACKGROUND:            LongLog.loge("系统正运行于低内存");            break;        case TRIM_MEMORY_MODERATE:            LongLog.loge(" 系统正运行于低内存状态并且你的进程已经已经接近LRU名单的中部位置");            break;        case TRIM_MEMORY_COMPLETE:            LongLog.loge("系统正运行与低内存的状态并且你的进程正处于LRU名单中最容易被杀掉的位置");            break;    }}
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