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How to Set selected item in BottomNavigationView

由 佐手、 提交于 2019-11-30 11:29:16
Magesh Pandian

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;
    }
}

Instead of selected you need to setChecked(true) that item. Try this code

mBottomNavigationView=(BottomNavigationView)findViewById(R.id.bottom_nav);
mBottomNavigationView.getMenu().findItem(R.id.item_id).setChecked(true);

Checked item is highlighted in BottomNavigationView.

Kotlin extension version of Abshishek's answer:

internal fun BottomNavigationView.checkItem(actionId: Int) {
    menu.findItem(actionId)?.isChecked = true
}

// use 
bottom_navigation.checkItem(R.id.navigation_home)

This does not trigger OnNavigationItemSelectedListener.

You can use:

    navigationView?.menu?.findItem(drawableMenuItem.id)?.isChecked = true

and it will not fire OnNavigationItemSelectedListener events.

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!
}

You can also set selection in BottomNavigatioView using index like this :

public void selectBottomNavigationOption(int index) {
        switch (index) {
            case 0:
                index = R.id.action_1;
                break;
            case 1:
                index = R.id.action_2;
                break;
            case 2:
                index = R.id.action_3;
                break;
            case 3:
                index = R.id.action_4;
                break;
        }
        bottomNavigationView.setSelectedItemId(index);
    }

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.

FYI: for fragment, onCreateView

BottomNavigationView mBottomNavigationView = getActivity().findViewById(R.id.bottomNavigationView);

mBottomNavigationView.setSelectedItemId(R.id.your_item);

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
}
标签
android
bottomnavigationview
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