This crash only occurs when you compile with YYC, not with VM. I suggest trying to compile your app with VM instead.

You totally messed up the concept of Object Oriented Programming. You defined PatientAlarm class to incapsulate all logic of working with MediaPlayer. It's OK.

But why did you make all methods static? Why new PatientAlarm() called inside these methods and created instance even not assigned to some variable or field that makes it target for garbage collection?

This is example of how you should do it:

public class PatientAlarm {
    private MediaPlayer md;

    public PatientAlarm(Context context) {
        md = MediaPlayer.create(context, R.raw.patient_alarm);
        md.setLooping(true);
        md.prepare();
    }

    public void start() {
        if (!md.isPlaying()) {
            md.start();
        }
    }

    public void stop() {
        if (md.isPlaying()) {
            md.stop();
        }
    }
}

Adapt it to your case and read more about using MediaPlayer class.