當我按下返回鍵時，底部導航的顏色不會改變，但我的片段會改變。我想同時改變兩者。即當我回去時，片段應該隨著底部導航圖標而改變。這是我當前的代碼：MainActivity.javapublic class MainActivity extends AppCompatActivity {private FrameLayout mMainFrame;Fragment homeFragment = new HomeFragment();Fragment trendingFragment = new TrendingFragment();Fragment latestFragment = new LatestFragment();Fragment inboxFragment= new InboxFragment();Fragment libraryFragment = new LibraryFragment();// Adding acion on botom navigation icon basically adding Fragment Actionprivate BottomNavigationView.OnNavigationItemSelectedListener mOnNavigationItemSelectedListener        = new BottomNavigationView.OnNavigationItemSelectedListener() {    @Override    public boolean onNavigationItemSelected(@NonNull MenuItem item) {        switch (item.getItemId()) {            case R.id.bottom_navigation_home:                setFragment(homeFragment);                return true;            case R.id.bottom_navigation_trending:                setFragment(trendingFragment);                return true;            case R.id.bottom_navigation_latest:                setFragment(latestFragment);                return true;            case R.id.bottom_navigation_inbox:                setFragment(inboxFragment);                return true;            case R.id.bottom_navigation_library:                setFragment(libraryFragment);                return true;            default:                return false;        }    }};@Overrideprotected void onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentView(R.layout.activity_main);    // Decleration Connecting Java To xml    mMainFrame = (FrameLayout) findViewById(R.id.main_container);    BottomNavigationView navigation = (BottomNavigationView) findViewById(R.id.bottom_navigation);    navigation.setOnNavigationItemSelectedListener(mOnNavigationItemSelectedListener);    setFragment(homeFragment); // Start Home Fregment first}