日报--安卓导航栏实现

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:id="@+id/container"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    >

    <com.google.android.material.bottomnavigation.BottomNavigationView
        android:id="@+id/nav_view"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:background="?android:attr/windowBackground"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintHorizontal_bias="0.0"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:menu="@menu/bottom_nav_menu" />

    <fragment
        android:id="@+id/nav_host_fragment_activity_main"
        android:name="androidx.navigation.fragment.NavHostFragment"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:defaultNavHost="true"
        app:layout_constraintBottom_toTopOf="@id/nav_view"
        app:layout_constraintHorizontal_bias="0.0"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="1.0"
        app:navGraph="@navigation/mobile_navigation" />

</androidx.constraintlayout.widget.ConstraintLayout>

<?xml version="1.0" encoding="utf-8"?>
<navigation xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/mobile_navigation"
    app:startDestination="@+id/navigation_home">

    <!-- 登录注册Fragment -->
    <fragment
        android:id="@+id/loginRegisterFragment"
        android:name="com.di.appforbridge.LoginRegisterFragment"
        android:label="Login"
        tools:layout="@layout/fragment_login_register">

        <action
            android:id="@+id/action_login_to_home"
            app:destination="@id/navigation_home"
            app:popUpTo="@id/loginRegisterFragment"
            app:popUpToInclusive="true" />
    </fragment>

    <fragment
        android:id="@+id/navigation_home"
        android:name="com.di.appforbridge.ui.home.HomeFragment"
        android:label="@string/title_home"
        tools:layout="@layout/fragment_home" />

    <fragment
        android:id="@+id/navigation_model_library"
        android:name="com.di.appforbridge.ui.dashboard.DashboardFragment"
        android:label="@string/title_model_library"
        tools:layout="@layout/fragment_model_library" />

    <fragment
        android:id="@+id/navigation_simulation"
        android:name="com.di.appforbridge.ui.notifications.NotificationsFragment"
        android:label="@string/title_simulation"
        tools:layout="@layout/fragment_simulation" />
    <fragment
        android:id="@+id/navigation_data_analysis"
        android:name="com.di.appforbridge.ui.analysis.AnalysisFragment"
        android:label="@string/title_data_analysis"
        tools:layout="@layout/fragment_data_analysis" />
    <fragment
        android:id="@+id/navigation_profile"
        android:name="com.di.appforbridge.ui.profile.ProfileFragment"
        android:label="@string/title_profile"
        tools:layout="@layout/fragment_profile" />
</navigation>

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android">

    <item
        android:id="@+id/navigation_home"
        android:icon="@drawable/ic_home_black_24dp"
        android:title="@string/title_home" />

    <item
        android:id="@+id/navigation_model_library"
        android:icon="@drawable/ic_dashboard_black_24dp"
        android:title="@string/title_model_library" />

    <item
        android:id="@+id/navigation_simulation"
        android:icon="@drawable/baseline_smart_toy_24"
        android:title="@string/title_simulation" />

    <item
        android:id="@+id/navigation_data_analysis"
        android:icon="@drawable/baseline_analytics_24"
        android:title="@string/title_data_analysis" />

    <item
        android:id="@+id/navigation_profile"
        android:icon="@drawable/baseline_person_24"
        android:title="@string/title_profile" />

</menu>