How to partially disable click on home button in Android toolbar?

Question

I have implemented onOptionsItemSelected to have control over the home button:

override fun onOptionsItemSelected(item: MenuItem): Boolean {
    when (item.itemId) {
        android.R.id.home -> {
            if (mode) {
                reset()
            }
        }
    }
    return super.onOptionsItemSelected(item)
}

Now, when I press home, I go back to the previous fragment. What I need is, if the mode is true, when I click on home, to trigger ONLY the reset() function without going back to the previous fragment. If it's false, simply go back. How can I achieve this?

Answer 1

You should return true to say the parent that the click on the menu item is consumed.

override fun onOptionsItemSelected(item: MenuItem): Boolean {
    when (item.itemId) {
        android.R.id.home -> {
            if (mode) {
                reset()
                return true
            }
        }
    }
    return super.onOptionsItemSelected(item)
}