android-architecture-navigation

问题 Let's say I have three fragments, A, B, C; A -> B <-> C Between B and C it is a circular relationship. Either B or C fragments requires arguments , example val args = Bundle() args.putString("StringKeyBC", argValueBtoC) findNavController().navigate(R.id.action_fragmentB_to_fragmentC, args, null) args.putString("StringKeyCB", argValueCtoB) findNavController().navigate(R.id.action_fragmentC_to_fragmentB, args, null) The problem is that every time I move between B & C, the fragments are added to

问题 I have main navigation: SplashFragment -> RegistrationFragment -> RootFragment <fragment android:id="@+id/splashFragment" android:name="com.low6.low6.features.splash.SplashFragment" android:label="Splash" tools:layout="@layout/fragment_splash" > <action android:id="@+id/action_next" app:clearTask="true" app:destination="@id/registrationFragment" /> </fragment> <fragment android:id="@+id/registrationFragment" android:name="com.low6.low6.features.registration.RegistrationFragment" android:label

问题 I am using Navigation Architecture in an image gallery, when I go from fragment A to B and then return back to A, these 3 methods are called again which will cause my gallery to reload , where I should load my data in fragment so when I come back from B to A my methods don't get called? : OnCreateView OnViewCreated OnResume 回答1: The fragment's lifecycle methods anyway will called again. You can google it how to work with fragment or activity lifecycle. The main idea how to deal with lifecycle

问题 Hello i am working on Navigation Architecture Component and i and setting up NavHostFragment for my Activity programatically. MainActivity.xml : <?xml version="1.0" encoding="utf-8"?> <android.support.constraint.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" tools:context=".MainActivity">

问题 I have an activity which has a NavHostFragment . The activity receives certain values in its intent. I want to pass this data to the first fragment i.e startDestination of the navigation graph. I couldn't find any documentation regarding this. I have already gone through this question on SO but I can't seem to find the addDefaultArguments method for navController.getGraph() . Is it possible to pass bundle to startDestination ? 回答1: i also came across same issue, This is how i resolved it:

问题 I've started using Android Architecture Components (Navigation and Safe Args, View Models) along with Koin library. Currently, I've got a problem with passing arguments between two fragments - I need to pass a string value from fragment A to fragment B, modify this value in fragment B and pass it back to fragment A. I've found one possible solution to my problem - shared view models. Unfortunately, this approach has one problem because I can pass and modify values between screens, but when

问题 I wanted to try new Navigation library. After following this guideline I experienced error at runtime: Caused by: android.view.InflateException: Binary XML file line #11: Binary XML file line #11: Error inflating class fragment Caused by: android.view.InflateException: Binary XML file line #11: Error inflating class fragment Caused by: android.app.Fragment$InstantiationException: Unable to instantiate fragment androidx.navigation.fragment.NavHostFragment: make sure class name exists, is

问题 I'm trying to migrate an app to the new Navigation Architecture Component that was announced at GoogleIO'18 Suppose I need to use an activity that is normally started with startActivityForResult . This activity comes either from a library or a system activity, so I can't modify it. Is there any way to include this activity as a destination in the navigation graph and get results from it? 回答1: The only solution I have so far is to wrap that activity behind a fragment that catches the result

问题 I was trying out Navigation architecture component and is now having difficulties in setting the title. How do I set the title programmatically and also how it works? To clear my question, let's have an example, where, I've set up a simple app with MainActivity hosting the navigation host controller, the MainFragment has a button and on clicking the button it goes to DetailFragment . The same code from another question of multiple app bars on stack-overflow. MainActivity public class

问题 I want to use Navigation Architecture Components. But I got a problem with importing safeargs Sync message: Could not find androidx.navigation:safe-args-gradle-plugin:1.0.0-alpha01. Searched in the following locations: https://dl.google.com/dl/android/maven2/androidx/navigation/safe-args-gradle-plugin/1.0.0-alpha01/safe-args-gradle-plugin-1.0.0-alpha01.pom https://dl.google.com/dl/android/maven2/androidx/navigation/safe-args-gradle-plugin/1.0.0-alpha01/safe-args-gradle-plugin-1.0.0-alpha01