如何使用 Android 导航组件在某些片段中隐藏操作栏？

Question

I am using android navigation components to navigate fragments. I can easily set action bar by using this code in the Main Activity:

    NavController navController = Navigation.findNavController(this, R.id.nav_host_fragment);
    NavigationUI.setupActionBarWithNavController(this, navController, appBarConfiguration);

But If I want to hide the supportActionbar in some of the fragments then what should be the best approach?

Answer 1

For the fragments that you want to hide the SupportActionBar , you can hide it in onResume() with .hide() , and show it again in onStop() with .show()

@Override
public void onResume() {
    super.onResume();
    ActionBar supportActionBar = ((AppCompatActivity) requireActivity()).getSupportActionBar();
    if (supportActionBar != null)
        supportActionBar.hide();
}

@Override
public void onStop() {
    super.onStop();
    ActionBar supportActionBar = ((AppCompatActivity) requireActivity()).getSupportActionBar();
    if (supportActionBar != null)
        supportActionBar.show();
}