从片段导航到活动时，后台堆栈不清除

Question

Here is my code

<fragment
  android:id="@+id/fragment1"
  android:name="com.example.app.Fragment1"
  android:label="SignatureFragment"
  tools:layout="@layout/layout_fragment1">
    <action
      android:id="@+id/action_fragment1_to_main_activity"
      app:destination="@id/main_activity"
      app:enterAnim="@anim/slide_in_from_right"
      app:exitAnim="@anim/no_anim"
      app:launchSingleTop="true"
      app:popEnterAnim="@anim/no_anim"
      app:popExitAnim="@anim/slide_out_to_right"
      app:popUpTo="@id/navigation_graph_id"
      app:popUpToInclusive="true" />
</fragment>

<activity
  android:id="@+id/main_activity"
  android:name="com.example.app.MainActivity"
  android:label="MainActivity"
  tools:layout="@layout/activity_main" />

Now the code for navigation

findNavController().navigate(R.id.action_fragment1_to_main_activity)

When I navigate to activity and press back, the fragment is still there. I want to clear the backstack after opening the activity.

I tried to remove the animation and also tried with removing app:launchSingleTop , but no success.

Answer 1

Edit Jetpack Navigation is intended to work with single activity and does not fully support activity navigation with parameters passed to action s

Thus to clear stack when navigating from one activity to another you will still need to call activity.finish()

Edit end

The thing is findNavController().navigate(R.id.action_fragment1_to_main_activity) wont work.

Try to navigate via navigate(@NonNull NavDirections directions) . In your case it will look something like this

findNavController().navigate(
     Fragment1Directions.actionFragment1ToMainActivity())

Hope it helps.