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Navigation练习demo

步骤说明:

1.build.gradle(APP)追加依赖 implementation "android.arch.navigation:navigation-fragment-ktx:1.0.0" implementation "android.arch.navigation:navigation-ui-ktx:1.0.0"

2.res新建navigation文件夹

3.navigation文件夹下新建nav_garden

4.nav_garden可以通过design追加plachholer,也可直接通过xml代码追加

<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/nav_garden" // 为当前xml追加id app:startDestination="@id/fragment_1"> // startDestination是和activity绑定后显示的第一个Fragment

<fragment
    android:id="@+id/fragment_1"      // fragment的id
    android:name="com.sunyd.navigationdemo.Fragment1"     // fragment的全路径
    tools:layout="@layout/fragment_1">      // fragment布局,方便在design中查看,实际不会编译到程序中

    <action
        android:id="@+id/fragment_1_to_fragment_2"    // action 的 id
        app:destination="@id/fragment_2" />           // destination 是目的地,要跳转到哪里的

</fragment>

<fragment
    android:id="@+id/fragment_2"
    android:name="com.sunyd.navigationdemo.Fragment2"
    tools:layout="@layout/fragment_2">

    <action
        android:id="@+id/fragment_2_to_fragment_3"
        app:destination="@id/fragment_3" />

    <argument
        android:name="title"            // 参数名称
        android:defaultValue="defaultValue"   // 参数默认值
        app:argType="string" />   /参数类型

</fragment>

<fragment
    android:id="@+id/fragment_3"
    android:name="com.sunyd.navigationdemo.Fragment3"
    tools:layout="@layout/fragment_3">

</fragment>

5.修改activity_main.xml

<androidx.constraintlayout.widget.ConstraintLayout 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:layout_width="match_parent" android:layout_height="match_parent">

<fragment
    android:id="@+id/demo_fragment"
    android:layout_width="0dp"
    android:layout_height="0dp"
    android:name="androidx.navigation.fragment.NavHostFragment"     // 定死的,不能改
    app:defaultNavHost="true"                                       // 将设备的回退操作进行拦截,并将其交给Navigation进行管理。
    app:navGraph="@navigation/nav_garden"                           // Navigation的配置文件,即上面第四步的xml文件
    app:layout_constraintTop_toTopOf="parent"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"/>

</androidx.constraintlayout.widget.ConstraintLayout>

6.跳转,无参数 Navigation.findNavController(view).navigate(R.id.fragment_1_to_fragment_2)

7.跳转,带参数(安全传值) 7.1.build.gradle(model)追加:classpath "androidx.navigation:navigation-safe-args-gradle-plugin:2.3.2" build.gradle(APP)追加:apply plugin: "androidx.navigation.safeargs.kotlin" val fragment2Bundle = Fragment2Args.fromBundle( bundleOf( "title" to "Fragment3" ) ).toBundle() Navigation.findNavController(view).navigate(R.id.fragment_2_to_fragment_3, fragment2Bundle)

7.返回 Navigation.findNavController(view).popBackStack()

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