Android development, Closing fragment using toggle button

Question

I think the issue is probably simple, but being pretty new to Java and to Android dev, I'm not really sure. What I'm trying to do is close a fragment that's been toggled on using a ToggleButton, but I can't find a way to then hide or close it. Any help would be appreciated.

Below is the code for the OnCheckChanged() listener.

public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {

    MyFragment frag = new MyFragment();
    FragmentManager manager = getFragmentManager();
    FragmentTransaction transaction = manager.beginTransaction();

    transaction.add(R.id.main_activity, frag, "Fragment1");

    if(isChecked)
    {
        transaction.show(frag);
    }
    else
    {
        transaction.hide(frag);
        //transaction.remove(frag);
    }

    transaction.commit();
}

Answer 1

Every time you hit onCheckedChanged, you are adding a NEW fragment and then either hiding or showing it. All other fragments you have previously created are still attached laid one on top of the other.

You should get the current fragment that is attached to the layout if there is one. If there isn't one already, create it and add it to the container.

For example, this should point you in the right direction.

private void HideFragment(){

    // Get the fragment that is attached to the layout
    Fragment frag=getFragmentManager().findFragmentById(R.id.centerFrame);

    if (frag==null){
        // The fragment does not exist yet so create one and add it
        frag=new MyFragment();
        getFragmentManager()
                .beginTransaction()
                .replace(R.id.centerFrame,frag)
                .commit();
    }

    //Hide the fragment
    getFragmentManager()
            .beginTransaction()
            .hide(frag)
            .commit();


}

Update: It is a little ambiguous what you are actually trying to achieve. You keep saying "close" the fragment but your code suggests you just want to toggle its visibility on and off.

If you actually want to completely remove the fragment then you should use the Remove method of the FragmentTransaction.