What is the ID of the back arrow drawable in the ActionBar?

Question

The following code causes a back arrow to appear in the ActionBar:

getSupportActionBar().setDisplayShowHomeEnabled(true);
getSupportActionBar().setDisplayHomeAsU         


        

Answer 1

The id of the back button in Toolbar is

android.R.id.home

You can take action from onOptionsItemSelected Method on Activity.

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    if (item.getItemId() == android.R.id.home) {
        //Do your task here.
        return true;
    }
    return super.onOptionsItemSelected(item);
}

Answer 2

You can easily create a back arrow using Android asset studio.

Click on res folder and then right click on drawable -> New -> Vector Asset

Answer 3

If you have the support library in your project, you can make a back button in any place in your applicaction like this:

<ImageButton
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:src="?attr/homeAsUpIndicator"
        android:background="?attr/selectableItemBackgroundBorderless"/>

Specifically the resource for the back arrow is ?attr/homeAsUpIndicator.