使用导航组件从一个活动导航到另一个活动 [英] Navigate from one activity to another with Navigation Component

问题描述

我正在尝试从一个导航图(使用 LoginActivity 上的主机片段)导航到另一个导航图(使用 HomeActivity 上的主机片段).我知道 Google 提倡使用单一活动应用程序，因此我只会使用这两个活动(以保持最少).

I am trying to navigate from one navigation graph (with the host fragment on the LoginActivity) to another navigation graph (with the host fragment on the HomeActivity). I know Google is advocating for single activity applications and thus I am only going to be using these two Activities (to keep it minimal).

我的login_navigation.xml

<?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/nav_login">

    <fragment
        android:id="@+id/nav_login"
        android:name="your.appname.LoginFragment"
        android:label="@string/login_menu"
        tools:layout="@layout/fragment_login" >
        <action
            android:id="@+id/action_nav_login_to_enterCellphone"
            app:destination="@id/login_enter_cellphone"
            app:popUpTo="@id/nav_login" />
    </fragment>
    <fragment
        android:id="@+id/login_enter_cellphone"
        android:name="your.appname.LoginEnterCellphoneFragment"
        android:label="@string/enter_cellphone_fragment_label"
        tools:layout="@layout/fragment_login_enter_cellphone" >
        <action
            android:id="@+id/action_enter_cellphone_to_enterOTPFragment"
            app:destination="@id/enterOTPFragment"
            app:popUpTo="@id/login_enter_cellphone" />
    </fragment>
    <fragment
        android:id="@+id/enterOTPFragment"
        android:name="your.appname.EnterOTPFragment"
        android:label="@string/enter_otp_label"
        tools:layout="@layout/fragment_enter_o_t_p" >
        <action
            android:id="@+id/action_enterOTPFragment_to_main_navigation"
            app:destination="@id/main_navigation"
            app:launchSingleTop="false" />
    </fragment>
    <include app:graph="@navigation/main_navigation" />
</navigation>

和main_navigation.xml

<?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/main_navigation"
    app:startDestination="@id/nav_home">

    <fragment
        android:id="@+id/nav_home"
        android:name="your.appname.HomeFragment"
        android:label="Home"
        tools:layout="@layout/fragment_home" />
    <fragment
        android:id="@+id/nav_profile"
        android:name="your.appname.ProfileFragment"
        android:label="@string/profile_menu"
        tools:layout="@layout/fragment_profile" />
</navigation>

我找到了这个答案并按如下方式实现了

I found this answer and implemented it as follows

private fun navigateToHomeActivity() {
    val action = EnterOTPFragmentDirections.actionEnterOTPFragmentToMainNavigation()
    findNavController().navigate(action)
    (activity as LoginActivity).finish() <-- later commented out
}

但它给了我以下错误 E/InputMethodManager: prepareNavigationBarInfo() rootView is null

如果我注释掉上面的行，错误就会消失，但它只会用 HomeFragment 替换当前片段.

If I comment out the above line the error goes away but it only replaces the current fragment with the HomeFragment.

如何导航到另一个活动，以便删除源活动(无法导航回它)并使用目标活动?

How do I navigate to another Activity so that the source Activity is removed (Can't navigate back to it) and the Destination Activity is used?

推荐答案

您可以定义 2 个导航图:

You can define 2 navigation graphs:

• ActivityA 带导航 Graph A
• ActivityB 带导航 Graph B

• ActivityA with navigation Graph A
• ActivityB with navigation Graph B

在GraphA中你可以定义一个目的地来启动ActivityB

In the GraphA you can define a destination to start ActivityB

<!-- Graph A -->
<navigation 
   ....
   <activity
        android:id="@+id/activityB"
        android:name=".ActivityB"
        ...>

        <argument
            .... />

    </activity>

</navigation>

然后您可以像使用目的地一样导航到该活动(= startActivity(intent)):

Then you can navigate to that activity ( = startActivity(intent)) using it like a destination:

Navigation.findNavController(view).navigate(R.id.activityB);

更多信息此处.

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