How to Set selected item in BottomNavigationView

Question

I am trying to set default item on activity created but it isn\'t working? This is my code:

protected void onCreate(Bundle savedInstanceState) {
    super.o         


        

Answer 1

Kotlin solution with Fragment

var fragment = Fragment()
bottomNav = findViewById(R.id.bottom_nav)
bottomNav.setOnNavigationItemSelectedListener { item ->
  when (item.itemId) {
    R.id.home -> {
      fragment = HomeForm()
    }
    R.id.score -> {
      fragment = ScoreForm()
    }
  }
  supportFragmentManager
    .beginTransaction()
    .replace(R.id.frame_layout, fragment)
    .setTransition(FragmentTransaction.TRANSIT_FRAGMENT_OPEN)
    .commit()
  true
}
bottomNav.selectedItemId = R.id.score // init open score tab

Answer 2

If what you want is that the clicked element is ignored on the view and is not returned as "selected" you can return false after the click is handled, in some cases and some designs you could need to open an activity instead of a fragment and this will make selected the bottom item after the activity is closed.

private val onNavigationItemSelectedListener = BottomNavigationView.OnNavigationItemSelectedListener { item ->
    when (item.itemId) {
        R.id.navigation_shipment -> {
            currentItem = TAB_INDEX_SHIPMENT
            val intent = Intent(this, BookShipmentActivity::class.java)
            startActivity(intent)
            return@OnNavigationItemSelectedListener false
        }
    }
    false
}

Answer 3

Just share my working source code

In Xml,

 <?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
    <android.support.design.widget.BottomNavigationView
        android:background="@color/colorWhite"
        android:id="@+id/gfPrlBnvBtmView"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_gravity="start"
        android:layout_alignParentBottom="true"
        app:menu="@menu/bottom_navigation_main" />
</LinearLayout>

In Java,

  public class TestActivity extends AppCompatActivity implements BottomNavigationView.OnNavigationItemSelectedListener
{
    private BottomNavigationView mBtmView;
    private int mMenuId;
    @Override
    public void onCreate(@Nullable Bundle savedInstanceState, @Nullable PersistableBundle persistentState) {
        super.onCreate(savedInstanceState, persistentState);
        setContentView(R.layout.test);
        mBtmView = (BottomNavigationView) findViewById(R.id.gfPrlBnvBtmView);
        mBtmView.setOnNavigationItemSelectedListener(this);
        mBtmView.getMenu().findItem(R.id.action_yoga).setChecked(true);
    }

    @Override
    public boolean onNavigationItemSelected(@NonNull MenuItem item) {
        // uncheck the other items.
        mMenuId = item.getItemId();
        for (int i = 0; i < mBtmView.getMenu().size(); i++) {
            MenuItem menuItem = mBtmView.getMenu().getItem(i);
            boolean isChecked = menuItem.getItemId() == item.getItemId();
            menuItem.setChecked(isChecked);
        }

        switch (item.getItemId()) {
            case R.id.action_food: {
            }
            break;
            case R.id.action_medical: {
            }
            break;
            case R.id.action_yoga: {
            }
            break;
            case R.id.action_postures: {
            }
            break;
        }
        return true;
    }
}

Answer 4

There are two senario

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.setOnNavigationItemSelectedListener(myNavigationItemListener);
bottomNavigationView.setSelectedItemId(R.id.my_menu_item_id);

I you only need to check it without tapping

Code example:

  BottomNavigationView bottomNavigationView= (getActivity()).findViewById(R.id.bottom_navigation);
    bottomNavigationView.getMenu().findItem(R.id.action_manage_orders_id).setChecked(true);

Answer 5

This works for me

Activity layout:

<android.support.design.widget.BottomNavigationView
        android:id="@+id/bottomNavigation"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        app:itemBackground="@color/colorPrimary"
        app:itemIconTint="@color/tabs"
        app:itemTextColor="@color/tabs"
        app:menu="@menu/bottom_navigation_main" />

color/tabs.xml:

<selector xmlns:android="http://schemas.android.com/apk/res/android">

    <item android:color="@color/not_active" android:state_checked="false"/>
    <item android:color="@color/active" android:state_checked="true"/>

</selector>

Click callback:

@Override
public boolean onNavigationItemSelected(@NonNull MenuItem item) {
    switch (item.getItemId()) {
        case R.id.action_tab0:
            setFragment(f0);
            break;
        case R.id.action_tab1:
            setFragment(f1);
            break;
    }
    return true; // not false!
}

Answer 6

Add android:enabled="true" to your BottomNavigation menu items.

<menu xmlns:android="http://schemas.android.com/apk/res/android">
  <item
    android:id="@+id/menu_id"
    android:enabled="true"
    android:icon="@drawable/ic_my_icon"
    android:title="@string/menu_title"/>
</menu>

And in onCreate() method, set up listeners by bottomNavigationView.setOnNavigationItemSelectedListener(mListener).

And set the desired item to be selected by doing bottomNavigationView.selectedItemId = R.id.menu_id.

This will trigger onNavigationItemSelected() from the NavigationItemSelectedListener whenever the activity is created.