Android将图片转为字节流存储在SharedPreferences

    public static void putImageToShare(Context mContext, ImageView imageView) {
        BitmapDrawable drawable = (BitmapDrawable) imageView.getDrawable();
        Bitmap bitmap = drawable.getBitmap();
        ByteArrayOutputStream byStream = new ByteArrayOutputStream();
        bitmap.compress(Bitmap.CompressFormat.PNG, 80, byStream);
        byte[] byteArray = byStream.toByteArray();
        String imgString = new String(Base64.encodeToString(byteArray, Base64.DEFAULT));
        ShareUtils.putString(mContext, "image_title", imgString);
        L.e(imgString);
    }

    public static void getImageToShare(Context mContext, ImageView imageView) {
        String imgString = ShareUtils.getString(mContext, "image_title", "");
        if (!imgString.equals("")) {
            byte[] byteArray = Base64.decode(imgString, Base64.DEFAULT);
            ByteArrayInputStream byStream = new ByteArrayInputStream(byteArray);
            Bitmap bitmap = BitmapFactory.decodeStream(byStream);
            imageView.setImageBitmap(bitmap);
        }
    }