Show/Hide Back Button in Toolbar

Question

I want to show back button in toolbar under some circumstances, and hide it under another. I wrote below code:

public void setupToolbar() {
    if (mStacks.get(mCurrentTab).size() > 1) {
        getSupportActionBar().setDisplayHomeAsUpEnabled(true);
        getSupportActionBar().setHomeButtonEnabled(true);
        toolbar.setNavigationOnClickListener(v -> onBackPressed());
    } else {
        getSupportActionBar().setDisplayHomeAsUpEnabled(false);
        getSupportActionBar().setHomeButtonEnabled(false);
    }
} 

But my problem is when I set home button as false, It won't be visible anymore even the first condition becomes true. Can anybody help me?

Answer 1

Show/Hide Back Button in Toolbar. please try it

show code

 if (getSupportActionBar() != null) {
        getSupportActionBar().setDisplayHomeAsUpEnabled(true);
        getSupportActionBar().setHomeButtonEnabled(true);
    }

and hide code

 if (getSupportActionBar() != null) {
        getSupportActionBar().setDisplayHomeAsUpEnabled(false);
        getSupportActionBar().setHomeButtonEnabled(false);
    }