How can I detect and handle my app when the device is connected as Mass Storage?

Question

I developing a game with SD resources. When I connect the device as MASS STORAGE the device crash. It's because when I plug my device in the PC as Mass Storage the device doesn't have access to the SD card. So I tried different ways to solved.

Currently I'm implementing a BroadcastReceiver and I'm handling the actions ACTION_MEDIA_BAD_REMOVAL (if the SD card is removed manually) and ACTION_MEDIA_SHARED (it supposed to handle the action if the device is connected as Mass Storage, but it doesn't).

When both of these actions is detected I send an error message and I finish the app.

When I remove the SD card manually it works, but not as mass storage.

Also on every frame I check if the SD card is on the device on every frame with this method.

 public int hasSDCard()
 {
    String state = Environment.getExternalStorageState();
        if(Environment.MEDIA_MOUNTED.equals(state) || Environment.MEDIA_MOUNTED_READ_ONLY.equals(state))
                return 1;
    return 0;
 }

When is 0 it doesn't have SD card and that where I also send the error message and finish the app.

But stills doesn't work on USB Mass Storage mode.

My question are: How can I detect when the device is connected as USB Mass Storage ?

What classes should I use?

Which listeners I can implement to call my error message activity and finish my app?

Answer 1

You should use BroadcastReceiver class. At the begining register a BroadcastReceiver for ACTION_MEDIA_MOUNTED or ACTION_MEDIA_UNMOUNTED intent. Create a class that will override onReceive() method, which is the method where you handle the mounting/unmounting.

http://developer.android.com/reference/android/content/Intent.html#ACTION_MEDIA_MOUNTED

As an extra info read the deprecation of ACTION_UMS_CONNECTED

http://developer.android.com/reference/android/content/Intent.html#ACTION_UMS_CONNECTED