Question

When I press my switch so that it shows the “on” position, how do I actually make it do something, for example, link it to a method that sets the volume of a player to 0? I’m guessing its Interface FieldChangeListener?

All my implementation occurs in the MainScreen class.

Bitmap switch_left = Bitmap.getBitmapResource("switch_left.png");
Bitmap switch_right = Bitmap.getBitmapResource("switch_right.png");
Bitmap switch_left_focus = Bitmap.getBitmapResource("switch_left_focus.png");
Bitmap switch_right_focus = Bitmap.getBitmapResource("switch_right_focus.png");

LabeledSwitch silentSwitch = new LabeledSwitch(switch_left, switch_right, switch_left_focus, switch_right_focus, "on", "off", true );
JustifiedHorizontalFieldManager silent = new JustifiedHorizontalFieldManager( new LabelField( "Silent Mode" ), silentSwitch, false, USE_ALL_WIDTH );
silent.setPadding(5,5,5,5);
add(silent);

I imported a game demo called OpenGlSpriteDemo, and looked at how they implemetned the start button with field change listener, so I tried to do that for the Labeledswitch. Am I heading in the right direction?

LabeledSwitch silentSwitch = new LabeledSwitch(switch_left, switch_right, switch_left_focus, switch_right_focus, "on", "off", false );
silentSwitch.setChangeListener(this);

public void fieldChanged(Field arg0, int arg1) 
{
    //If user sets the switch to on, reduce the volume to 0, 
    // else if user sets the switch to false, change it back 
    // to the default volume    
}

Answer 1

Figured it out using a boolean flag to tell if its silent already or not, and used a get and set methods of the volume variable and pass it to:

volume.setLevel(getVolume());       

and

boolean isSilent = false;

public void fieldChanged(Field field, int context) 
{
    if(!isSilent && field == silentSwitch)
    {
        setVolume(0);
        isSilent = true;
    }
    else if(field == silentSwitch && isSilent)
    {
        setVolume(20);
        isSilent = false;           
    }
}