How to pass object of type Parcelable to a Fragment using Navigation type safeargs plugin

Question

I am rewriting my simple UI app to use Navigation architecture component, I need to pass a Pojo that implements Parcelable, have not seen any doc on how to do that.

Any help would be appreciated.

Answer 1

Since safe-args-gradle-plugin:1.0.0-alpha03 you can use Parcelable objects by using their fully qualified class name:

<argument     android:name="item"     app:argType="com.example.app.model.Item"/> 

Parcelable arguments are now supported, using a fully qualified class name for app:type. The only default value supported is "@null" (https://issuetracker.google.com/issues/79563966)

Source: https://developer.android.com/jetpack/docs/release-notes

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To support nullability one has to use android:defaultValue="@null" with app:nullable="true".

Answer 2

I know the answer is already there but this may help someone. Code snippet

In build.gradle add this dependancy

ext{      ...      navigation_version = '1.0.0-alpha11' } dependencies {      ...      classpath "android.arch.navigation:navigation-safe-args-gradle-plugin:$navigation_version" } 

In app/build.gradle

apply plugin: 'androidx.navigation.safeargs' ... 

In Navigation graph

  <fragment             android:id="@+id/source_fragment_id"             android:name="app.test.SourceFragment"             android:label="@string/source_fragment_label"             tools:layout="@layout/source_fragment_layout">           <action                 android:id="@+id/action_source_fragment_to_destination_fragment"                 app:destination="@id/destination_fragment_id"                 ...                 />   </fragment>  <fragment             android:id="@+id/destination_fragment_id"             android:name="app.test.DestinationFragment"             android:label="@string/destination_fragment_label"             tools:layout="@layout/destination_fragment_layout">          <argument                 android:name="variableName"                 app:argType="app.test.data.model.CustomModel" />          ...  </fragment> 

Note: CustomModel should be Parcelable or Serializable.

When navigating to this DestinationFragment from SourceFragment

val direction = SourceFragmentDirections.ActionSourceFragmentToDestinationFragment(customModel) findNavController().navigate(direction) 

Now retrieving the value from bundle in DestinationFragment

... import app.test.DestinationFragmentArgs.fromBundle  class DestinationFragment : Fragment() {    val variableName by lazy {        fromBundle(arguments!!).variableName    }     ...    override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {         Log.e(DESTINATION_FRAGMENT_TAG,"onCreateView")          //Can use CustomModel variable here i.e. variableName      }  }