I am interested to try the Navigation graph showed in the Android Studio. But I got the preview unavailable after I import the google sample
I used the Android Studio 3.2 Preview Canary 16
<navigation xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
app:startDestination="#+id/launcher_home">
<fragment
android:id="#+id/launcher_home"
android:name="com.android.samples.arch.componentsbasicsample.StartFragment"
android:label="Home">
<action
android:id="#+id/end_action"
app:destination="#id/end_dest" />
</fragment>
<fragment
android:id="#+id/end_dest"
android:name="com.android.samples.arch.componentsbasicsample.EndFragment"
android:label="End"
>
</fragment>
</navigation>
Update on 10/6/2018:
Even I rebuild the project it doesn't work. But if added new screen, it showed the new one in preview mode
You should click on "text" tab in navigation editor (xml file of the navigation graph), and add:
tools:layout="#layout/layout_name"
inside destination element.
Should be something like this:
<fragment
android:id="#+id/someFragment"
android:name="com.freesoulapps.navigationtest.fragments.SomeFragment"
android:label="Some Fragment"
tools:layout="#layout/layout_name">
</fragment>
there is another way to have the preview in navigation xml.
First go in your xml fragment add
tools:context="com.packagename.nameFragment"
And that's it
if you go in your navigation file you can see the preview inside the selection and the navigation editor
And if you look in the code is auto write
tools:layout="#layout/layout_name"
For me is more logic to have the preview before add the fragment in the navigation editor.
May be there are method for add automatically the tools:context in the layout
Autocompletation not suggest for tools:context Fragment only suggest the tools:context Activity host so you need to write the fragment's name... if someone have a trick for this
learn more about tools:context :
enter link description here
Just add
tools:layout="fragmentname"
to every fragment whose preview is not visible.
Example:-
<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_graph"
app:startDestination="#id/startFragment">
<fragment
android:id="#+id/pickupFragment"
android:name="com.example.cup_cake.PickupFragment"
android:label="fragment_pickup"
tools:layout="#layout/fragment_pickup" />
</navigation>
Related
When I add the View Host Fragment, the design becomes invisible in the xml section, what can I do?
While navigating in Android Studio, when I add nav host fragment to the xml part, the design side becomes invisible, what can I do?
If you encounter such a problem, do not forget to give tools to the xml side in the navigation section, and do not forget to set the constrait to the nav host.
Navigation xml into
xmlns:tools="http://schemas.android.com/tools"
For example
<fragment
android:id="#+id/firstfragment"
android:name="com.example.countryapps.firstfragment"
tools:layout="#layout/fragment_firstfragment"
android:label="firstfragment" >
<action
android:id="#+id/action_firstfragment_to_secondfragment"
app:destination="#id/secondfragment" />
</fragment>
I have one app and one dynamic feature module i wish to navigate from
App nav graph
<?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/nav_graph"
app:startDestination="#id/mainFragment">
<!-- Main Fragment from App Module -->
<fragment
android:id="#+id/mainFragment"
android:name="com.xyz.MainFragment"
android:label="MainFragment"
tools:layout="#layout/fragment_main">
<action
android:id="#+id/action_mainFragment_to_nav_graph_home"
app:destination="#id/nav_graph_home" />
</fragment>
<!-- Home Navigation from App Module-->
<include app:graph="#navigation/nav_graph_home" />
<include-dynamic
android:id="#+id/nav_graph_dashboard"
android:name="com.feature.dashboard"
app:graphResName="nav_graph_dashboard"
app:moduleName="dashboard" />
</navigation>
And feature navigation
<?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/nav_graph_dashboard"
app:moduleName="dashboard"
app:startDestination="#id/dashboardFragment1">
<fragment
android:id="#+id/dashboardFragment1"
android:name="com.feature.DashboardFragment1"
android:label="DashboardFragment1">
</fragment>
</navigation>
Returns error
java.lang.IllegalStateException: The included <navigation>'s id com.xyz.dashboard:id/nav_graph_dashboard is different from the destination id com.xyz:id/nav_graph_dashboard. Either remove the <navigation> id or make them match.
It seems that removing id from feature navigation solves the issue but i couldn't find how to make them match even though both <include-dynamic> and <navigation> have the same id android:id="#+id/nav_graph_dashboard" I don't need id for <navigation> for this example but i wonder if it's possible when <navigation> has one
Remove the + from your ID in your feature navigation graph:
android:id="#id/nav_graph_dashboard"
When you use the #+id syntax, you create a new ID in your dynamic feature's package (you'll note the exception explicitly calls out the package names for each resource ID for exactly that reason). By removing the +, you use the already created ID from the main module's package, which makes them match.
The same IllegalStateException can be achieved simply but including app:moduleName="app" in the root nav graph in the root module (usually app module). Take care to ensure that attribute is only set in dynamic feature module nav graphs.
So I was using Jetpack navigation and the number of fragments kept growing up.
We can separate fragments in different navigation graph as described in this document
jetpack nav graph docs
Then I tried to put different nav graphs in different files because that felt more organized and readable file but I get the following error when I try to navigate to different nav_graph files.
nav_graph_start.xml
<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_graph_start"
app:startDestination="#id/splashScreen"
tools:ignore="UnusedNavigation">
<fragment
android:id="#+id/splashScreen"
android:name="com.timetoface.android.splash.SplashFragment"
android:label="Login Fragment"
tools:layout="#layout/fragment_splash">
<action
android:id="#+id/action_splash_to_login"
app:destination="#id/nav_graph_auth"
/>
<action
android:id="#+id/action_splash_to_home"
app:destination="#id/nav_graph_home"
/>
</fragment>
</navigation>
nav_graph_auth.xml
<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_graph_auth"
app:startDestination="#id/emailLoginScreen"
tools:ignore="UnusedNavigation">
................................
</navigation>
nav_graph_home.xml
<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_graph_home"
app:startDestination="#id/emailLoginScreen"
tools:ignore="UnusedNavigation">
................................
</navigation>
navigation destination com.app.android:id/nav_graph_home
referenced from action com.app.android:id/action_splash_to_home
is unknown to this NavController
So,
Are multiple navigation graph files not supported yet?
Am I missing something that I should change?
First of all you can use include. Take a look this
example: first_graph.xml
<include app:graph="#navigation/second_graph" />
then set action to included graph's id
<action
android:id="#+id/action_fragment_to_second_graph"
app:destination="#id/second_graph" />
Also you can use extension to use multiple graphs merged.
Take a look to this
Actually every activity should have it's own nav graph.
Ofcourse you can have multiple nav graph in your application. Each Activity can have only one Navigation Graph. I just added two Nav_Graph for different activity. Works fine. Here is a screenshot of my Navigation folder.
I'm currently trying to transition to a Fragment in navigation2.xml to navigation.xml. I thought Reference other navigation graphs with would do but doesn't work. If there is a sample or hints about transitioning between fragments of different navigation.xml files , I would love to hear from you!
<!-- (root) 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/nav_graph"
app:startDestination="#id/fragment">
<include app:graph="#navigation/included_graph" />
<fragment
android:id="#+id/fragment"
android:name="com.example.myapplication.BlankFragment"
android:label="Fragment in Root Graph"
tools:layout="#layout/fragment_blank">
<action
android:id="#+id/action_fragment_to_second_graph"
app:destination="#id/second_graph" />
</fragment>
...
</navigation>
second navigation file
<?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/second_graph"
app:startDestination="#id/includedStart">
<fragment
android:id="#+id/includedStart"
android:name="com.example.myapplication.IncludedStart"
android:label="fragment_included_start"
tools:layout="#layout/fragment_included_start" />
</navigation>
As per the Design navigation graphs documentation:
[Nested graphs] also provide a level of encapsulation — destinations outside of the nested graph do not have direct access to any of the destinations within the nested graph. Instead, they should navigate() to the nested graph itself, where the internal logic can change without affecting the rest of the graph.
Therefore you can use navigate(R.id.second_graph) without issue from anywhere in navigation.xml, but you can't directly access anything within that other graph.
Note that the one exception to this is navigating by URI, which allows you to navigate to any destination in your graph (whether nested or not) by navigating using an implicit deep link.
I am using Navigation Editor in the android studio and my android studio version is 3.3.2.
my problem is when I add a fragment to the navigation editor, the attributes of the fragment are not showing in design mode. look at the picture:
mobile_navigation.xml
<?xml version="1.0" encoding="utf-8"?>
<navigation xmlns:tools="http://schemas.android.com/tools">
<fragment id="#+id/currentWeatherFragment2"
name="ir.houmansanati.forecastmvvm.ui.weather.current.CurrentWeatherFragment"
label="current_weather_fragment" tools:layout="#layout/current_weather_fragment"/>
<fragment id="#+id/futureListWeatherFragment4"
name="ir.houmansanati.forecastmvvm.ui.weather.future.list.FutureListWeatherFragment"
label="future_list_weather_fragment" tools:layout="#layout/future_list_weather_fragment"/>
<fragment id="#+id/futureDetailWeatherFragment2"
name="ir.houmansanati.forecastmvvm.ui.weather.future.detail.FutureDetailWeatherFragment"
label="future_detail_weather_fragment" tools:layout="#layout/future_detail_weather_fragment"/>
<fragment id="#+id/settingsFragment2" name="ir.houmansanati.forecastmvvm.ui.setting.SettingsFragment"
label="SettingsFragment"/>
</navigation>
as you see my fragments in XML have name and label and id attributes but all of them are labeled as fragment. even when I set the attributes from the design mode after pressing Enter the text is gone but it changes in XML text.
I have tried Invalidate Caches/Restart but the problem still exists.
Any help?
You're using id=, name=, and label=. As per the Implementing Navigation documentation, these need to be android:id=, android:name=, and android:label=, respectively.
Note that your topmost <navigation> element must also contain xmlns:android="http://schemas.android.com/apk/res/android" in order to use the android: prefix.