Obb (Opaque Binary Blobb) getMountedObbPath() returning null

问题

Why is the obb-file not found when its actually there?

in the logcat window

 11-05 20:42:33.860: I/System.out(7563): mainFile = /storage/sdcard0/Android/obb/main.11.se.sourses.thai.obb

11-05 20:42:33.860: I/System.out(7563): main = null

the codesnippet

    StorageManager storage = (StorageManager) getApplicationContext().getSystemService(STORAGE_SERVICE);
    File mainFile = new File(Environment.getExternalStorageDirectory() + "/Android/obb/" +
               "main." + 11 + "." + "se.sourses.thai" + ".obb");
    String main = storage.getMountedObbPath(Environment.getExternalStorageDirectory() + "/Android/obb/");
    System.out.println("mainFile = " + mainFile);
    System.out.println("main = " + main);

according to the documentation getMountedObbPath returns the following:

Check the mounted path of an Opaque Binary Blob (OBB) file. This will give you the path to where you can obtain access to the internals of the OBB.Parameters:rawPath path to OBB imageReturns:absolute path to mounted OBB image data or null if not mounted or exception encountered trying to read status

Yes - in my case you can see that main returns null

So what could be wrong

the .obb file is there (see image)
the packagename is correct (min. sdk is set to 11)

So - why is the getMountedObbPath() returning null when the file is actually there? How can I make this work?

tried with this answer but it did not work.

APK expansion file expPath does not exists

Mycode:

    String packageName = this.getPackageName();
    String EXP_PATH = "/Android/obb/";
    File expPathDir = new File(root.toString() + EXP_PATH + packageName);   
    int mainVersion = 11;
    File expPath = new File(expPathDir,
    String.format("main.%d.%s.obb", mainVersion, packageName));
    StorageManager storage = (StorageManager) getApplicationContext().getSystemService(STORAGE_SERVICE);
    boolean b = storage.isObbMounted(expPath.getAbsolutePath());
    System.out.println("ismounted = " + b);

it returns false.

expPath outputs the string:

  expPath = /storage/sdcard0/Android/obb/se.sources.thai/main.11.se.sources.thai.obb

Edit:

I've even created another subfolder to the obb-file (according to Developer.Android). So now the path to the obb-file is:

/storage/sdcard0/Android/obb/se.sources.thai/main.11.se.sources.thai.obb

But its not working

来源：https://stackoverflow.com/questions/33553722/obb-opaque-binary-blobb-getmountedobbpath-returning-null

标签

android

large-files

apk-expansion-files