如何在RecyclerView行上单击以打开菜单项

Question

I have an app with BottomNavigationView , which has 2 menu items. Both have their Fragments . On the first item in the Fragment I have a RecyclerView . I want to open the second menu item on click on RecyclerView row and also send some parameters. How and where should I do it?

What am I doing now: In the Fragment , which I show on the first menu item, I have a method, that I pass to RecyclerViewAdapter , so that it can be triggered each time a row is tapped. But I cannot find any method in my listener as BottomNavActivity to open it's second menu item

Answer 1

You need a reference to your activity within the adapter. You can pass this in during initialisation using

SomeAdapter(var activity: Activity)

Then inside your adapter you set the onClickListener with the following action

activity?.navigation?.selectedItemId = R.id.navigation_id_here

Answer 2

From API 25.3.0 it was introduced the method setSelectedItemId(int id) which let's you mark an item as selected as if it was tapped.

From docs:

Set the selected menu item ID. This behaves the same as tapping on an item.

Code example:

BottomNavigationView bottomNavigationView;
bottomNavigationView = (BottomNavigationView) findViewById(R.id.bottomNavigationView);
bottomNavigationView.setSelectedItemId(R.id.my_menu_item_id);

For those, who still use SupportLibrary < 25.3.0

View view = bottomNavigationView.findViewById(R.id.menu_action_item);
view.performClick();