相冊獲取圖片報OOM異常解決辦法

獲取一個圖片容易報OOM異常,這裏做個筆記,但是這個會把圖片搞得很模糊,圖片的質量有所下降,後續會完善

 private void setPic(ImageView imageView, Uri uri) {
        if (getActivity() != null) {
            //獲取目標控件的大小
            int targetW = imageView.getWidth();
            int targetH = imageView.getHeight();

            BitmapFactory.Options bmOptions = new BitmapFactory.Options();
            try {
             //inJustDecodeBounds爲true，可以加載源圖片的尺寸大小，decodeStream方法返回的bitmap爲null
                bmOptions.inJustDecodeBounds = true;                BitmapFactory.decodeStream(getActivity().getContentResolver().openInputStream(uri), null, bmOptions);
                // 得到源圖片的尺寸
                int photoW = bmOptions.outWidth;
                int photoH = bmOptions.outHeight;
                //通過比較獲取較小的縮放比列
                int scaleFactor = Math.min(photoW / targetW, photoH / targetH);
                // 將inJustDecodeBounds置爲false，設置bitmap的縮放比列
                bmOptions.inJustDecodeBounds = false;
                bmOptions.inSampleSize = scaleFactor;
                bmOptions.inPurgeable = true;
                //再次decode獲取bitmap
                Bitmap bitmap = BitmapFactory.decodeStream(getActivity().getContentResolver().openInputStream(uri), null, bmOptions);
                imageView.setImageBitmap(bitmap);
            } catch (FileNotFoundException e) {
                e.printStackTrace();
            }
        }
    }