Set Selected Item in Android Bottomnavigationview

Set selected item in Android BottomNavigationView

Seems to be fixed in SupportLibrary 25.1.0 :)
Edit: It seems to be fixed, that the state of the selection is saved, when rotating the screen.

How to Set selected item in BottomNavigationView

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;
    }
}

Set initially selected item index/id in BottomNavigationView

Set the selected menu item ID using setSelectedItemId:

bottomNavigationView.setSelectedItemId(R.id.item_id);

This method started being available from Android Support Library 25.3.0.

How to change selected item in BottomNavigationView

I think the problem is that you check on a wrong BottomNavigationView, the following line in onCreateView is actually inflating a new instance of view without attaching it to the screen:

BottomNavigationView bottom = inflater.inflate(R.layout.activity_main, container, false).findViewById(R.id.mainactivity_bottom_navi);

Instead of inflating a new view, try access the view from its activity:

BottomNavigationView bottom = getActivity().findViewById(R.id.mainactivity_bottom_navi);

Set no item pre-selected in Bottom Navigation view

I combined the solution mentioned by @Ashish Kumar and resolved my query and

private void customizeBottomBar() {
        mBottomNavigation.getMenu().getItem(0)
                .setIcon(ContextCompat.getDrawable(activity, R.drawable.ic_reserve_normal));
        changeMenuItemCheckedStateColor(mBottomNavigation, getUnCheckedColor(), getUnCheckedColor());
    }

/**
   * Method to change the color state of bottom bar view
   * @param bottomNavigationView - BottomNavigation view instance
   * @param checkedColorHex int value of checked color code
   * @param uncheckedColorHex int value of unchecked color code
   */
  void changeMenuItemCheckedStateColor(BottomNavigationView bottomNavigationView,
      int checkedColorHex, int uncheckedColorHex) {

    int[][] states = new int[][]{
        new int[]{-android.R.attr.state_checked}, // unchecked
        new int[]{android.R.attr.state_checked}, // checked
    };

    int[] colors = new int[]{
        uncheckedColorHex,
        checkedColorHex
    };

    ColorStateList colorStateList = new ColorStateList(states, colors);
    bottomNavigationView.setItemTextColor(colorStateList);
    bottomNavigationView.setItemIconTintList(colorStateList);

  }

Bottom NavigationView change items programmatically

From API 25.3.0,
you can use setSelectedItemId

BottomNavigationView bottomNavigationView;
bottomNavigationView = (BottomNavigationView)findViewById(R.id.bottom_navigation);
bottomNavigationView.setSelectedItemId(R.id.item_4th);

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