Add Icon to the left of the title in the action bar in android

Question

I want to add a clickable icon/button to the left of the title in the action bar . How to do it? Following is the code with which I have added search and setting icon to the act

Answer 1

I always like to put a AppBarLayout that I can control the way the toolbar appears

That way a can put more elements and arrange them like I want. In this case insert a left icon to close the activity by a fragment.

So in the fragment a do this

 //That is in the Fragment
setupToolbar(R.id.toolbarAddPlan,getString(R.string.addPlanTour),true)





//It is in na Kotlin Extansion file.



 inline fun Fragment.setupToolbar(@IdRes id: Int, title:String?= null, upNavigation: Boolean = false) : ActionBar {

    val activityCompat = activity as AppCompatActivity
    val toolbar = activity?.findViewById(id)
    activityCompat.setSupportActionBar(toolbar)
    if(title != null){
        activityCompat.supportActionBar?.title = title
    }
    activityCompat.supportActionBar?.setHomeButtonEnabled(true)
    return activityCompat.supportActionBar!!
}

The result will be something like this:

The action "SALVAR" i put via inflat menu

 override fun onCreateOptionsMenu(menu: Menu?, inflater: MenuInflater?) {
        super.onCreateOptionsMenu(menu, inflater)
        inflater?.inflate(R.menu.menu_add_plan_tour,menu)
    }

    override fun onOptionsItemSelected(item: MenuItem?): Boolean {
        return when (item?.itemId){
            R.id.menuPlanTourSave ->{
                true
            }else ->return super.onOptionsItemSelected(item)
        }

    }

Menu XML layout src/menu/menu_add_plan_tour.xml

And do not forget to use setHasOptionsMenu(true) to enable the menu.