Android中BottomNavigationView动态添加menu布局文件

Android中BottomNavigationView动态添加menu布局文件

一、底部几个Tab,并使用NavHostFragment的布局

<androidx.constraintlayout.widget.ConstraintLayout
      android:id="@+id/container"
      android:layout_width="match_parent"
      android:layout_height="match_parent"
      tools:context=".MainActivity">

    <com.google.android.material.bottomnavigation.BottomNavigationView
        android:id="@+id/nav_view"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginStart="0dp"
        android:layout_marginEnd="0dp"
        android:background="?android:attr/windowBackground"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:itemTextColor="@color/color_state_menu_nav"
         />

    <fragment
        android:id="@+id/nav_main_fragment"
        android:name="androidx.navigation.fragment.NavHostFragment"
        android:layout_width="0dp"
        android:layout_height="0dp"
        app:defaultNavHost="true"
        app:layout_constraintBottom_toTopOf="@id/nav_view"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:navGraph="@navigation/nav_home" />

  </androidx.constraintlayout.widget.ConstraintLayout>

二、动态设置BottomNavigationView的menu

在xml中BottomNavigationView的app:menu="@menu/bottom_nav_menu"属性不再使用，而通过以下代码动态设置:

    private fun initBottomNavigationView(){
        if(PreferenceManager.getAccountType().equals(Constant.ACCOUNT_TYPE_1) || PreferenceManager.getAccountType().equals(Constant.ACCOUNT_TYPE_2)){
            mBinding!!.navView.inflateMenu(R.menu.bottom_nav_menu_farmer)
        }else{
            mBinding!!.navView.inflateMenu(R.menu.bottom_nav_menu_expert)
        }
    }

三、使用NavController在各个Fragment之间导航

    private var mBinding: ActivityMainBinding?=null
    private  var navController: NavController?=null
    private  var navGraph: NavGraph?=null
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        mBinding = DataBindingUtil.setContentView(this, R.layout.activity_main)
        navController = findNavController(R.id.nav_main_fragment)
        navGraph = navController!!.graph
        mBinding!!.navView.setupWithNavController(navController!!)
    }