On item click, make other items visible

Question

I have this in my activity_main_drawer.xml:

<group android:checkableBehavior="single">
        <item android:id="@+id/menu1" android:icon="@android:drawable/ic_menu_camera"
            android:title="menu 1" />
        <item android:id="@+id/submenu1" android:icon="@android:drawable/ic_menu_gallery"
            android:title="submenu 1" android:visible="false" />
</group>

I want when someone click menu1 to change submenu1 android:visible to true.

I tried with:

public boolean onNavigationItemSelected(MenuItem item) {
        int id = item.getItemId();

        if (id == menu1) {
            R.id.submenu1..setVisibility(View.VISIBLE);
        }

        DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
        drawer.closeDrawer(GravityCompat.START);
        return true;
    }

But I get Cannot Resolve Method setVisibility(int). What should I do?

score 0 · Accepted Answer · answered Dec 04 '15 at 20:58

0

Try doing:

findViewById(R.id.submenu1).setVisibility(View.VISIBLE);

R.id.submenu1 is just a number, but you can use that to find the actual widget (and then do things to that object).

answered Dec 04 '15 at 20:58

Buddy

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Sounds like it didn't find the widget.. Take a look at this answer on how to debug NullPointerExceptions: http://stackoverflow.com/a/218510/1715829 – Buddy Dec 04 '15 at 21:08

On item click, make other items visible

1 Answers1