Android toolbar not called onOptionsItemSelected From Fragments On Backstack

Question

I recently started updating my application to use the new toolbar component introduced on Android 5.0, in favor of using a custom view over the action bar. I followed the explorer here: http://antonioleiva.com/material-design-everywhere/ and adding a toolbar is fine. The problem is that I am using a navigation structure in which I have MainActivity and replacing the content by adding snippets to the backstack. I override the onCreateOptionsMenu and onOptionsItemSelected methods in my snippets to set the menu items in the Toolbar, and the icons change accordingly when I switch Snippets, and onOptionsItemSelected is called in the first snippet, but not called when I add the snippet to the backstack. The onOptionsItemSelected function in MainActivity is not even called, so the event is not consumed by Activity. I also tried just replacing the Fragment without adding it to the backstack, but onOptionsItemSelected is still not being called. What am I missing to get onOptionsItemSelected to call after I change the contents of the fragment? The corresponding code is posted below.

Application Theme:

<style name="AppThemeLight" parent="@style/Theme.AppCompat.Light"> <item name="actionMenuTextColor">@color/white</item> <item name="android:windowDisablePreview">true</item> <item name="android:windowNoTitle">true</item> <item name="android:windowActionBarOverlay">true</item> <item name="android:windowActionBar">false</item> </style> 

Adding a toolbar to MainActivity:

 Toolbar toolbar = (Toolbar)findViewById( R.id.toolbar ); if (toolbar != null) { setSupportActionBar( toolbar ); getSupportActionBar().setDisplayHomeAsUpEnabled( true ); toolbar.setNavigationIcon( R.drawable.toolbar_icon_menu ); } 

Menu Functions in MainActivity:

 @Override public boolean onCreateOptionsMenu( Menu menu ) { Log.v( "Main", "onCreateOptionsMenu" ); return super.onCreateOptionsMenu( menu ); } @Override public boolean onOptionsItemSelected( MenuItem item ) { Log.v( "Main", "onOptionsItemSelected" ); return super.onOptionsItemSelected( item ); } 

Functions of the top-level fragment:

 @Override public void onCreateOptionsMenu( Menu menu, MenuInflater inflater ) { super.onCreateOptionsMenu( menu, inflater ); inflater.inflate( R.menu.main_looks, menu ); } @Override public boolean onOptionsItemSelected( MenuItem item ) { switch (item.getItemId()) { case R.id.miOptions: onOptions(); return true; default: return super.onOptionsItemSelected( item ); } } 

Menu functions in a fragment by stack

 @Override public void onCreateOptionsMenu( Menu menu, MenuInflater inflater ) { super.onCreateOptionsMenu( menu, inflater ); inflater.inflate( R.menu.user, menu ); } @Override public boolean onOptionsItemSelected( MenuItem item ) { Log.v( "User", "onOptionsItemSelected" ); switch (item.getItemId()) { case R.id.miUserShare: onShareUser(); return true; case R.id.miUserEdit: onEditUserProfile(); return true; default: return super.onOptionsItemSelected( item ); } } 

Answer 1

I solved the problem by accident when making changes to other fragments and noticing that onOptionsItemSelected is called from fragments with simpler layouts. It turns out, for some reason, having ScrollView as a top-level component for the fragment layout prevents the toolbar from receiving touch events. Wrapping a ScrollView in an optional RelativeLayout (it will probably work with any container) onOptionsItemSelected can be called. I suppose this has something to do with the fact that the toolbar component is now part of the view hierarchy - can't think about why adding a wrapper for ScrollView might fix the problem. If someone can help explain this strange behavior, it will be appreciated.

Answer 2

Remember to call setHasOptionsMenu (true) on your fragment's OnCreate