backpress and Scan again

[lucazin]

Hello.. um using this API, but i have some problems.

Everything Works Fine..except when :

I click to Scan (but i not Scan..Just open the câmera for scanning), and click in backpress Button.. and o repeat this process for 2 pra 3 times.. when i will scan not Just open..its scanning 3times ( ALL times i enter and press the back Button)

I debug and i see, everytime os registering a listener but when a back press the listener is nota clearead. So It Will read any times ..or any listeners have.

Help me please