When toolbar back button is pressed

Question

how can I create a condition on my android app where When I pressed the back button on the toolbar some code will happening.

I tried this but it doesnt work.

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Answer 1

Toolbar toolbar;
toolbar.setNavigationIcon(R.drawable.left_arrow_thick);
setSupportActionBar(mToolbar);
toolbar.setNavigationOnClickListener(new View.OnClickListener()
{
     @Override
     public void onClick(View v) 
     {
                //write your code here
                stopTimerTask();
     }
});