bitmap内存溢出的问题

我的代码如下

??? is = new FileInputStream(new File(baseMagazinePath + this.bookId + "/" + fileList[currentImgNo] + ".png"));
??? iv.setImageDrawable(Drawable.createFromStream(is, "myStream"));

有时候出现内存溢出

改为?
??? is = new FileInputStream(new File(baseMagazinePath + this.bookId + "/" + fileList[currentImgNo] + ".png"));
??? BitmapFactory.Options opts = new BitmapFactory.Options();?
??? opts.inSampleSize = 4;
??? Bitmap bitmap = BitmapFactory.decodeStream(is, null, opts);?
??? iv.setImageBitmap(bitmap);

就好了。