是否可以使用Android导航体系结构组件(Android Jetpack)有条件地设置startDestination? [英] Is it possible to set startDestination conditionally using Android Navigation Architecture Component(Android Jetpack)?

问题描述

我正在使用导航 https://developer.android.com/jetpack/"rel =" noreferrer> Android Jetpack 可以在屏幕之间导航. 现在，我想动态设置startDestination.

I am using Navigation from Android Jetpack to navigate between screens. Now I want to set startDestination dynamically.

我有一个名为MainActivity的活动 还有两个片段FragmentA& FragmentB.

I have an Activity named MainActivity And two Fragments, FragmentA & FragmentB.

var isAllSetUp : Boolean = // It is dynamic and I’m getting this from Preferences.

    If(isAllSetUp)
    {
     // show FragmentA
    }
    else
    {
     //show FragmentB
    }

我想使用导航体系结构组件设置以上流程.目前，我已使用如下所示的startDestionation，但它不能满足我的要求.

I want to set above flow using Navigation Architecture Component. Currently I have used startDestionation as below but it’s not fulfilling my requirement.

<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/lrf_navigation"
   app:startDestination="@id/fragmentA">

   <fragment
       android:id="@+id/fragmentA"
       android:name="com.mindinventory.FragmentA"
       android:label="fragment_a"
       tools:layout="@layout/fragment_a" />
</navigation>

是否可以使用Android导航体系结构组件有条件地设置startDestination?

Is it possible to set startDestination conditionally using Android Navigation Architecture Component?

推荐答案

最后，我找到了查询的解决方案...

Finally, I got a solution to my query...

将以下代码置于Activity的onCreate()方法中.

Put below code in onCreate() method of Activity.

科特琳码

val navHostFragment = home_nav_fragment as NavHostFragment
val inflater = navHostFragment.navController.navInflater
val graph = inflater.inflate(R.navigation.nav_main)
graph.setDefaultArguments(intent.extras)
graph.startDestination = R.id.fragment1
//or
//graph.startDestination = R.id.fragment2

navHostFragment.navController.graph = graph

Java代码

NavHostFragment navHostFragment = (NavHostFragment) getSupportFragmentManager().findFragmentById(R.id.home_nav_fragment);  // Hostfragment
NavInflater inflater = navHostFragment.getNavController().getNavInflater();
NavGraph graph = inflater.inflate(R.navigation.nav_main);
graph.setDefaultArguments(getIntent().getExtras());
graph.setStartDestination(R.id.fragment1);

navHostFragment.getNavController().setGraph(graph);
navHostFragment.getNavController().getGraph().setDefaultArguments(getIntent().getExtras());


NavigationView navigationView = findViewById(R.id.navigationView);
NavigationUI.setupWithNavController(navigationView, navHostFragment.getNavController());

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