绑定GirdView时报内存误解决方案

问题描述：

选择相册或者拍照的图片，然后绑定GirdView，选择一张照片的时候，app运行正常，当选择多张照片时，app莫名的直接退出。

开始百思不得其解，经验告诉自己，去查看LogCat跟踪信息，结果发现很耀眼的词汇，

OutOfMemoryError,擦擦 果然是你导致的

解决方案：

public class MySimpleAdapter extends SimpleAdapter 
{
     public MySimpleAdapter(Context context,
            List<? extends Map<String, ?>> data, int resource, String[] from,
            int[] to) {
        super(context, data, resource, from, to);
        // TODO Auto-generated constructor stub
    }

@Override
    public void setViewImage(ImageView imageView, String imageFile) {

        // TODO Auto-generated method stub
        try {
            imageView.setImageResource(Integer.parseInt(imageFile));
        } catch (NumberFormatException nfe) {

            BitmapFactory.Options opts = new BitmapFactory.Options();
            opts.inJustDecodeBounds = true;
            BitmapFactory.decodeFile(imageFile, opts);

            opts.inSampleSize = computeSampleSize(opts, -1, 128 * 128);
            // 这里一定要将其设置回false，因为之前我们将其设置成了true
            opts.inJustDecodeBounds = false;
            try {
                Bitmap bmp = BitmapFactory.decodeFile(imageFile, opts);
                imageView.setImageBitmap(bmp);
            } catch (OutOfMemoryError err) {
            }
        }
        //

    }


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;
    }

    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 lowerBound;
        }

        if ((maxNumOfPixels == -1) && (minSideLength == -1)) {
            return 1;
        } else if (minSideLength == -1) {
            return lowerBound;
        } else {
            return upperBound;
        }
    }

}