hide / show action bar in fragment

Question

I have MainActivity extends AppCompatActivity. In that 3 fragments which can be changed by sliding gesture. I want to remove action bar in middle one. And Add action bar again when user slide in 1st or 3rd fragment.

I have below code:

@Override
public void setMenuVisibility(boolean menuVisible) {
    super.setMenuVisibility(menuVisible);
    if(menuVisible && getActivity()!=null){
        getActivity().getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);
    }
}

@Override
public void setMenuVisibility(boolean menuVisible) {
    super.setMenuVisibility(menuVisible);
    if(menuVisible){
        getActivity().getWindow().clearFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN);
    }
}

But, it's giving me below warning:

Skipped 45 frames! The application may be doing too much work on its main thread.

I tried to put that in:

getActivity().runOnUiThread(new Runnable() {
    @Override
    public void run() {
         // hide / show action bar...
    }
});

App is lagging. How can I make it smooth?

Can you consider use `getSupportActionBar().show()`/`getSupportActionBar().hide()`? — betorcs, Jun 29 '16 at 19:19
@betorcs: There is no such a method in my case. I also tried with `getActivity().getActionBar().show();`. But, in that case also app is crashing: `Attempt to invoke virtual method 'void android.app.ActionBar.show()' on a null object reference` — RNK, Jun 29 '16 at 19:21
You need cast `getActivity()` to `AppCompatActivity`, so `((AppCompatActivity) getActivity()).getSupportActionBar()` — betorcs, Jun 29 '16 at 19:25
@betorcs: Crashing: `Attempt to invoke virtual method 'void android.support.v7.app.ActionBar.show()' on a null object reference` — RNK, Jun 29 '16 at 19:32
Maybe you calling it, before fragment be attach to activity. — betorcs, Jun 29 '16 at 19:36

score 1 · Answer 1 · edited Nov 30 '17 at 22:53

Add the following code snippet in the onResume callback of the middle Fragment

AppCompatActivity activity = (AppCompatActivity) getActivity();
if (activity != null) {
    activity.getSupportActionBar().hide();
}

and in the onResume callback of the other two Fragments add

AppCompatActivity activity = (AppCompatActivity) getActivity();
if (activity != null) {
    activity.getSupportActionBar().show();
}

hide / show action bar in fragment

1 Answers1