我想知道人们是否成功地在Android中创建/加载加密的OBB(不透明二进制Blob)文件？这是一个跟进这个question 1：What is OBB(Opaque Binary Blob) in Android develop site?，继那个帖子我执行下面的方向(从ICS 4.01基线，在Ubuntu 10.10-32bit和Ubuntu 12.4-64bit尝试都)：在Android中使用加密的OBB文件

sudo modprobe cryptoloop

sudo modprobe twofish

sudo modprobe vfat

./mkobb.sh -d /tmp/obb/ -kblahblah -o /tmp/out.obb -v

obbtool a -n com.test.blah -v 1 -s 997ff9b1516a6788 /tmp/out.obb # 997ff... is the salt from the mkobb step

obbtool i /temp/out.obb # verify the obb file

adb push /temp/out.obb /sdcard/

从这里我将out.obb文件复制到手机上的/ sdcard /。并用下面的代码安装：

String obbFile = Environment.getExternalStorageDirectory() + "/out.obb";

mgr = (StorageManager) getSystemService(Context.STORAGE_SERVICE); // mgr is a member varible of my main activity

Log.i("OBB", "trying to mount : " + obbFile + " does it exist? " + new File(obbFile).exists());

if (mgr.mountObb(obbFile, "blahblah", new OnObbStateChangeListener(){

@Override

public void onObbStateChange(String path, int state) {

Log.i("OBB", String.format("onObbStateChange:Path [%s] State=%d", path, state));

if (state == OnObbStateChangeListener.ERROR_COULD_NOT_MOUNT){

Log.i("OBB", "THIS IS THE ERROR I GET");

}

}}))

{

Log.i("OBB", "Attempting to mount");

} else {

Log.i("OBB", "Mount failed"); // this isn't happening

}

这样做的最终结果是：

E/MountService(2004): Couldn't mount OBB file: -1

I/OBB (21219): onObbStateChange:Path [/mnt/sdcard/out.obb] State=21

I/OBB (21219): THIS IS THE ERROR I GET

任何人看到这个什么问题吗？似乎它应该工作！

注：我有android.permission.WRITE_EXTERNAL_STORAGE，也是我得到预期的信息：

ObbInfo info = ObbScanner.getObbInfo("/sdcard/out.obb"); // this returns expected info, so the file is there and able to be read.

编辑：链接到Android的开发者群体的问题here