Points to consider:

1. This asset provides you a block 'AndroidBackButton_Press' that you will place inside your Layout block.

2. You need to customize your Layout(s) to have one input parameter:

    - IsDefaultBackButton (Boolean: True by default)

   - Then you need to add an event OnAndroidBackButton - not mandatory

   - After that you need to create a client action to raise that event called ActionHandler_OnAndroidBackButton

3. Then in each page you define what you want to do adding an action to this event that we have provided in Layout.