André Ramon :
I am currently working on a way to send arguments from one fragment to another using SafeArgs from the Navigation Component. I have set the arguments in the destination fragment as described in several blog posts, but I also want to be able to navigate to that destination without arguments. I don't want to pass a bunch of nulls and 0s.
EDIT: Here is my 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"
android:label="@string/app_name"
app:startDestination="@+id/homeFragment">
<fragment
android:id="@+id/homeFragment"
android:name="com.andreramon.todo.destinations.HomeFragment"
android:label=" "
tools:layout="@layout/fragment_home">
<action
android:id="@+id/action_homeFragment_to_imprintFragment"
app:destination="@id/imprintFragment" />
<action
android:id="@+id/action_homeFragment_to_settingsFragment"
app:destination="@id/settingsFragment" />
<action
android:id="@+id/action_homeFragment_to_addEditTaskFragment"
app:destination="@id/addEditTaskFragment"/>
</fragment>
<fragment
android:id="@+id/addEditTaskFragment"
android:name="com.andreramon.todo.destinations.AddEditTaskFragment"
android:label="@string/toolbar_parent_tasks"
tools:layout="@layout/fragment_add_edit_task">
<argument
android:name="id"
app:argType="integer"/>
<argument
android:name="title"
app:argType="string" />
<argument
android:name="priority"
app:argType="integer" />
<argument
android:name="duedate"
app:argType="string" />
<argument
android:name="remindme"
app:argType="string" />
<argument
android:name="addanote"
app:argType="string" />
</fragment>
<fragment
android:id="@+id/imprintFragment"
android:name="com.andreramon.todo.destinations.ImprintFragment"
android:label="@string/drawer_imprint"
tools:layout="@layout/fragment_imprint" />
<fragment
android:id="@+id/settingsFragment"
android:name="com.andreramon.todo.destinations.SettingsFragment"
android:label="@string/drawer_settings"
tools:layout="@layout/fragment_settings" />
</navigation>
This is how I currently navigate to the destination using arguments:
NavDirections action = HomeFragmentDirections.actionHomeFragmentToAddEditTaskFragment(...)
I retrieve the arguments at the destination using:
titleEditText.setText(AddEditTaskFragmentArgs.fromBundle(getArguments()).getTitle());
etc.
Now, when trying to navigate to AddEditTaskFragment using:
addTaskFab.setOnClickListener(Navigation.createNavigateOnClickListener(R.id.addEditTaskFragment));
I get this error in the logcat:
Process: com.andreramon.todo, PID: 10014
java.lang.IllegalArgumentException: Required argument "id" is missing and does not have an android:defaultValue
at com.andreramon.todo.destinations.AddEditTaskFragmentArgs.fromBundle(AddEditTaskFragmentArgs.java:33)
at com.andreramon.todo.destinations.AddEditTaskFragment.onViewCreated(AddEditTaskFragment.java:71)
at androidx.fragment.app.FragmentManagerImpl.moveToState(FragmentManagerImpl.java:895)
at androidx.fragment.app.FragmentManagerImpl.addAddedFragments(FragmentManagerImpl.java:2092)
at androidx.fragment.app.FragmentManagerImpl.executeOpsTogether(FragmentManagerImpl.java:1866)
at androidx.fragment.app.FragmentManagerImpl.removeRedundantOperationsAndExecute(FragmentManagerImpl.java:1822)
at androidx.fragment.app.FragmentManagerImpl.execPendingActions(FragmentManagerImpl.java:1723)
at androidx.fragment.app.FragmentManagerImpl$1.run(FragmentManagerImpl.java:146)
at android.os.Handler.handleCallback(Handler.java:873)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:193)
at android.app.ActivityThread.main(ActivityThread.java:6669)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858)
André Ramon :
You need to call action.setTitle(...) instead of doing it directly.