Android导航组件:在片段中传递值(参数)

问题描述

我创建了 Navigation Drawer Activity ，作为 Navigation Drawer Activity 的新格式，根据新的Android架构，我使用 导航组件 结构.

I have created Navigation Drawer Activity, As updated new format of Navigation Drawer Activity, As per new Android architecture, I got it with Navigation Component structure.

带有 NavController 和 NavigationUI 的 NavigationView 代码，如下所示，当我单击任何导航项时，这是打开的片段.

The NavigationView code with NavController and NavigationUI as below which is opening fragment when I click on any navigation item.

    DrawerLayout drawer = findViewById(R.id.drawer_layout);
    NavigationView navigationView = findViewById(R.id.nav_view);
    // Passing each menu ID as a set of Ids because each
    // menu should be considered as top level destinations.
    mAppBarConfiguration = new AppBarConfiguration.Builder(
            R.id.nav_home, R.id.nav_profile, R.id.nav_privacy_policy,
            R.id.nav_terms, R.id.nav_contact_us, R.id.nav_share, R.id.nav_send)
            .setDrawerLayout(drawer)
            .build();
    NavController navController = Navigation.findNavController(this, R.id.nav_host_fragment);
    NavigationUI.setupActionBarWithNavController(this, navController, mAppBarConfiguration);
    NavigationUI.setupWithNavController(navigationView, navController);

这是针对 nav_host_fragment :

<fragment
        android:id="@+id/nav_host_fragment"
        android:name="androidx.navigation.fragment.NavHostFragment"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:defaultNavHost="true"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:navGraph="@navigation/mobile_navigation" />

使用此 navigation/mobile_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_home">

    <fragment
        android:id="@+id/nav_home"
        android:name="com.sohamerp.marsremedies.fragment.HomeFragment"
        android:label="@string/menu_home"
        tools:layout="@layout/fragment_home" />

    <fragment
        android:id="@+id/nav_profile"
        android:name="com.sohamerp.marsremedies.fragment.ProfileFragment"
        android:label="@string/menu_my_profile"
        tools:layout="@layout/fragment_profile" />

    <fragment
        android:id="@+id/nav_privacy_policy"
        android:name="com.sohamerp.marsremedies.fragment.PrivacyPolicyFragment"
        android:label="@string/menu_privacy_policy"
        tools:layout="@layout/fragment_privacy_policy" />

    <fragment
        android:id="@+id/nav_terms"
        android:name="com.sohamerp.marsremedies.fragment.TermsConditionFragment"
        android:label="@string/menu_terms"
        tools:layout="@layout/fragment_terms_condition" />

    <fragment
        android:id="@+id/nav_contact_us"
        android:name="com.sohamerp.marsremedies.fragment.ContactUsFragment"
        android:label="@string/menu_contact_us"
        tools:layout="@layout/fragment_terms_condition" />

</navigation>

我想做什么:

现在，我想在Fragment调用时将某些值作为bundle(参数)传递给Fragment.

What I want to do:

Now I want to pass some values as bundle (arguments) in Fragment when its called.

场景:我有两个片段 PrivacyPolicyFragment 和 TermsConditionsFragment ，在这两个片段中，我只是相应地在WebView中打开链接.因此，当我单击 Privacy Policy 的菜单项时，我将传递与此相关的链接.

Scenario: I have two fragment PrivacyPolicyFragment and TermsConditionsFragment, In both fragments, I am just opening link inside WebView accordingly. So When I click on menu item of Privacy Policy, I will pass link related to same.

在此新结构 navigation/mobile_navigation.xml 开头的片段中，如何传递参数?

In this new structure navigation/mobile_navigation.xml opening fragments, How can I pass arguments?

有帮助吗?

推荐答案

所以我忘了通过以下链接:定义目标参数

So I forgot to go through this link : Define Destination Arguments

但是这个答案对像我这样的所有懒惰人很有帮助:

But this answer helpful to all lazy peoples like me:

在项目级别 build.gradle 中添加依赖项:

Add dependency in project level build.gradle:

classpath "androidx.navigation:navigation-safe-args-gradle-plugin:2.1.0"

在应用程序级别 build.gradle 中应用插件:

Apply plugin in app level build.gradle:

apply plugin: "androidx.navigation.safeargs"

使用XML:预定义(静态)值:

在导航/navigation/mobile_navigation.xml 的xml文件中，如下所示声明 argument 标记，或者您可以通过此链接:

Using XML: predefined (static) value:

In xml file of navigation /navigation/mobile_navigation.xml declare argument tag as below or you can design through this link:

<fragment
    android:id="@+id/nav_privacy_policy"
    android:name="com.sohamerp.marsremedies.fragment.PrivacyPolicyFragment"
    android:label="@string/menu_privacy_policy"
    tools:layout="@layout/fragment_privacy_policy" >
    <argument
        android:name="privacyPolicyLink"
        app:argType="string"
        android:defaultValue="http://sohamerp.com/avo/avo_privacy_policy.html"/>
</fragment>

<fragment
    android:id="@+id/nav_terms"
    android:name="com.sohamerp.marsremedies.fragment.PrivacyPolicyFragment"
    android:label="@string/menu_terms"
    tools:layout="@layout/fragment_terms_condition" >
    <argument
        android:name="privacyPolicyLink"
        app:argType="string"
        android:defaultValue="http://sohamerp.com/avo/avo_privacy_policy.html"/>
</fragment>

现在，您必须像这样在Fragment中编写代码:

Now you have to write code in your Fragment like:

if(getArguments() != null) {
    // The getPrivacyPolicyLink() method will be created automatically.
    String url = PrivacyPolicyFragmentArgs.fromBundle(getArguments()).getPrivacyPolicyLink();
}

希望它会对您有帮助.

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