Custom “navigate up” behavior for certain fragment using Navigation component

Question

I want to add custom up navigation from fragment using Navigation component

In my build.gradle(app) I use androidx.appcompat:appcompat:1.1.0-

Answer 1

Add click event to toolbar back button in this way

@Override
public boolean onOptionsItemSelected(MenuItem item) {
 switch (item.getItemId()) {
case android.R.id.home:
    // Toolbar back button pressed, do something you want    

default:
    return super.onOptionsItemSelected(item);
  }
}

Another way

  Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
    // Title and subtitle
    toolbar.setNavigationOnClickListener(new OnClickListener() {
        @Override
        public void onClick(View v) {
            // Toolbar back button pressed, do something you want    
        }
    });