Android ActionBar (ActionBarCompat) Spinner Dropdown list ?

Question

I am currently working ActionBar (ActionBarCompat) oriented project, I Need some Clarification about actionbar.

I am using spinner layout like this,

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Answer 1

If you will add spinner to your action bar through menu's xml like this

android:actionViewClass="android.widget.Spinner"

it will appear just like other menu actions - to the right.

If you want to make it appear to the left, you can do another way.

I'm doing it inside a fragment (but you can do it with activity), and using Toolbar, so my code is:

activity_main.xml (theme and popupTheme are important for arrow color) :

...

...

action_bar_spinner_title.xml:

action_bar_spinner_list.xml:

Inside fragment:

private static final String[] arItems = {"Item 1", "Item 2", "Item 3", };

private Toolbar toolbar;
private Spinner actionBarSpinner;

public ActionBarSpinnerFragment() {
}

@Nullable @Override
public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container,
                         @Nullable Bundle savedInstanceState) {

    return inflater.inflate(R.layout.fragment_action_bar_spinner, container, false);
}

@Override
public void onStart() {
    super.onStart();

    final Activity activity = getActivity();
    if(activity != null) {
        ActionBar actionBar = ((AppCompatActivity) activity).getSupportActionBar();
        if (actionBar != null) {
            actionBar.setDisplayShowTitleEnabled(false);

            toolbar = activity.findViewById(R.id.toolbar);
            actionBarSpinner = new Spinner(actionBar.getThemedContext());
            ArrayAdapter spinnerAdapter = new ArrayAdapter<>(activity,
                    R.layout.action_bar_spinner_title, android.R.id.text1, arItems);
            spinnerAdapter.setDropDownViewResource(R.layout.action_bar_spinner_list);
            actionBarSpinner.setAdapter(spinnerAdapter);
            actionBarSpinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
                @Override
                public void onItemSelected(AdapterView parent, View view, int position, long id) {
                    FragmentManager fragMngr = getFragmentManager();
                    if(fragMngr != null) {
                        FragmentTransaction fragTransact = fragMngr.beginTransaction();
                        fragTransact.replace(R.id.frag_frame,
                                TextViewFragment.newInstance(arItems[position]));
                        fragTransact.commit();

                    } else {
                        Log.w(LOG_TAG, "ActionBarSpinnerFragment: FragmentManager == null");
                    }
                }

                @Override
                public void onNothingSelected(AdapterView parent) {
                }
            });
            toolbar.addView(actionBarSpinner);
        } else {
            Log.w(LOG_TAG, "ActionBarSpinnerFragment.onStart: actionBar == null");
        }
    } else {
        Log.w(LOG_TAG,  "ActionBarSpinnerFragment.onStart: activity == null");
    }
}

@Override
public void onStop() {
    super.onStop();
    if(toolbar != null && actionBarSpinner != null) {
        toolbar.removeView(actionBarSpinner);
    } else {
        Log.w(LOG_TAG, "ActionBarSpinnerFragment: toolbar == " + toolbar
                + "; actionBarSpinner == " + actionBarSpinner);
    }
}