/*
* The Code inside the activity. It uses the binder Interface to connect to a running service
* and gets the current contexts of it.
*
* Note: The log output prints out "Received 0 bytes" every time.
*/

private void updateContexts() throws RemoteException {
        Parcel data = Parcel.obtain();
        Parcel reply = Parcel.obtain();
        binder.transact(CRSBinder.GET_CONTEXTS, data, reply, 0);

        Log.i("CRS", "Received " + reply.dataSize() + " bytes");

        Parcelable parcelData[] = reply.readParcelableArray(context.Context.class.getClassLoader());
}

/*
* The onTransact handler inside the binder. It just delegates the request to the according function
*/
@Override
protected boolean onTransact(int code, Parcel data, Parcel reply, int flags)
{
    switch(code)
    {
        case NEW_LOCATION: return newContext(data,reply);
        case DELETE_LOCATION: return deleteContext(data, reply);
        case GET_CONTEXTS: return getContexts(data,reply);
        default: throw new IllegalArgumentException();
    }
}

/*
* The actual respond code. The contexts are collected, and sent back using the reply parcel.
*
* Note: The log output prints "386 bytes written to reply"
*/
private boolean getContexts(Parcel data, Parcel reply) {

    Log.i("CRS", "Replying all contexts");
    List<Context> contexts = service.getContexts();

    if(contexts.isEmpty()==false)
    {
        Context contextArray[] = new Context[contexts.size()];
        for(int i=0; i<contexts.size();++i)
        {
            contextArray[i]=contexts.get(i);
        }

        reply.writeParcelableArray(contextArray, 0);
        Log.i("CRS", reply.dataSize() + " bytes written to reply");
    }
    return true;
}