How to set selected item in BottomNavigationView

Question

I am trying to set the default element for the created activity, but it does not work? This is my code:

protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_userhome); mTextMessage = (TextView) findViewById(R.id.message); profile = (FrameLayout) findViewById(R.id.profile); mall = (FrameLayout) findViewById(R.id.mall); dietplan =(FrameLayout) findViewById(R.id.dietplan); BottomNavigationView navigation = (BottomNavigationView) findViewById(R.id.navigation); navigation.setSelectedItemId(R.id.dietplan); navigation.setOnNavigationItemSelectedListener (mOnNavigationItemSelectedListener); } 

But it seems that navigation.setSelectedItemId(R.id.dietplan); does not work. Please help me set the default lower nav item:

This is my stack trace (logcat):

 FATAL EXCEPTION: main Process: gym.android.ommsoftware.gym, PID: 1915 java.lang.RuntimeException: Unable to start activity ComponentInfo{gym.android.ommsoftware.gym/gym.android.ommsoftware.gym.Userhome}: java.lang.NullPointerException at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2404) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2464) at android.app.ActivityThread.access$900(ActivityThread.java:172) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1308) at android.os.Handler.dispatchMessage(Handler.java:102) at android.os.Looper.loop(Looper.java:146) at android.app.ActivityThread.main(ActivityThread.java:5653) at java.lang.reflect.Method.invokeNative(Native Method) at java.lang.reflect.Method.invoke(Method.java:515) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1291) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1107) at dalvik.system.NativeStart.main(Native Method) Caused by: java.lang.NullPointerException at gym.android.ommsoftware.gym.Userhome.onCreate(Userhome.java:57) at android.app.Activity.performCreate(Activity.java:5541) at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1093) at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2368) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2464) at android.app.ActivityThread.access$900(ActivityThread.java:172) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1308) at android.os.Handler.dispatchMessage(Handler.java:102) at android.os.Looper.loop(Looper.java:146) at android.app.ActivityThread.main(ActivityThread.java:5653) at java.lang.reflect.Method.invokeNative(Native Method) at java.lang.reflect.Method.invoke(Method.java:515) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1291) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1107) at dalvik.system.NativeStart.main(Native Method) 

Answer 1

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 2

Instead of the one you need setChecked(true) this element. Try this code

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

BottomNavigationView item is highlighted in the BottomNavigationView .

Answer 3

Kotlin Extension Option Abshishek Answer :

 internal fun BottomNavigationView.checkItem(actionId: Int) { menu.findItem(actionId)?.isChecked = true } // use bottom_navigation.checkItem(R.id.navigation_home) 

This does not call OnNavigationItemSelectedListener .

Answer 4

You can use:

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

and it will not be the OnNavigationItemSelectedListener event.

Answer 5

It works for me

Action 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

You can also set the selection to the BottomNavigatioView using the index as follows:

 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); } 

Answer 7

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() configure listeners using bottomNavigationView.setOnNavigationItemSelectedListener(mListener) .

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

This will call onNavigationItemSelected() from the NavigationItemSelectedListener each time an action is created.

Answer 8

If you want the selected element to be ignored in the view and not returned as “selected”, you can return false after processing the click, in some cases and in some projects you may need to open the action instead of a fragment and this will make the lower element selected after closing the action.

 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 9

 bottomNavigationView.setSelectedItemId(R.id.action_item1); 

where action_item1 is the identifier of the menu item.

Answer 10

In my case, I want to highlight the bottomNavigationView element when I click a button from another fragment. Element highlighting works fine when I click on a tab element to switch between fragments. But I would need to include fragments from the local button inside my fragment. In such cases, I cannot access the bottomNavigationView, which is available in MainActivity from my fragment. The application crashes whenever I try to do as shown below from my snippet

Option 1: (crashed)

 void onButtonClick() { View view = MainActivity.bottomNavigationView.findViewById(R.id.navigation_home); view.performClick(); } 

Option 2: (crashed)

  bottomNavigationView.setSelectedItemId(R.id.homeTab) 

Option 3: (crashed)

  MainActivity.mBottomBar.selectTabAtPosition(2); 

Answer 11

For your information: for fragment, onCreateView

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