Navigate to a particular fragment when app launched from sharesheet

Question

I am using Jetpack Navigation in my app having a single activity and two fragments (Fragment A which is also the home fragment and Fragment B which can be navigated from Fragment A).

There is an intent-filter added to the MainActivity as shown below which can accept plain text.

 <activity android:name=".MainActivity"
        android:screenOrientation="portrait">

        <intent-filter>
            <action android:name="android.intent.action.MAIN" />
            <category android:name="android.intent.category.LAUNCHER"/>
        </intent-filter>

        <intent-filter>
            <action android:name="android.intent.action.SEND"/>
            <category android:name="android.intent.category.DEFAULT"/>
            <data android:mimeType="@string/text_mime_type_text_plain"/>
        </intent-filter>
    </activity>

When a user selects my app from the Android sharesheet, the end goal is to pass the data received from the Intent to the Fragment B. Currently, I am receiving the Intent in Fragment A (Home Fragment) and then using NavController to navigate to Fragment B using the below code.

  private fun checkReceivedIntent() {
    val receivedUrlIntent = activity?.intent
    val intentAction = receivedUrlIntent?.action
    val intentType = receivedUrlIntent?.type

    if (intentAction == Intent.ACTION_SEND && intentType != null) {
        if (intentType == getString(R.string.text_mime_type_text_plain) ) {
            val receivedText = receivedUrlIntent.getStringExtra(Intent.EXTRA_TEXT)
            val action = FragmentADirections.actionFragmentAToFragmentB(receivedText)
            findNavController().navigate(action)
        }
    }
}

The problem is that when Fragment B is opened, on pressing the back button or back arrow of Toolbar (Even when pressed multiple times) the Fragment A doesn't appear and Fragment B keeps on reappearing.

I don't know what I am missing. Is this a proper way to open a particular fragment when the app is opened by the user from the share sheet inside another app?

Edit

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.coordinatorlayout.widget.CoordinatorLayout 
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:animateLayoutChanges="true">

<fragment
    android:id="@+id/navHostFragment"
    android:name="androidx.navigation.fragment.NavHostFragment"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    app:defaultNavHost="true"
    app:navGraph="@navigation/nav_graph" />

<com.google.android.material.bottomappbar.BottomAppBar
    android:id="@+id/bottomAppBar"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_gravity="bottom"
    app:fabCradleMargin="8dp"

    />

<com.google.android.material.floatingactionbutton.FloatingActionButton
    android:id="@+id/fabMainActivity"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:src="@drawable/ic_add"
    app:layout_anchor="@id/bottomAppBar" />

</androidx.coordinatorlayout.widget.CoordinatorLayout>

Can you please share how you define the container in your MainActivity xml ? Also I'm wondering where you call `checkReceivedIntent` ? I'm assuming that it's inside Fragment A ? — Ibrahim Ali, Nov 08 '19 at 14:13
@IbrahimAli I have updated the question. Yes, I am calling checkReceivedIntent in the Fragment A. — Mehul Kanzariya, Nov 08 '19 at 14:26
`checkReceivedIntent()` will be called everytime when you try to load Fragment A, hence it keeps navigating to B even when you press back — JavaGhost, Nov 11 '19 at 19:09
@MehulKanzariya Could you please clarify. So you are trying to return to `Fragment A` from `Fragment B`? And you cannot to do that, because of navigation from sharesheet. Right? — GensaGames, Nov 11 '19 at 19:35
@JavaGhost Yes, you are correct. So, is there any other preferred way to do this? — Mehul Kanzariya, Nov 12 '19 at 16:00
after receiving the values from intents, clear it! since it remains available when you navigate back to fragment A, it again fetches values and proceeds forward... — Abdul Aziz, Nov 14 '19 at 09:17

GensaGames · Answer 1 · 2019-11-15T17:19:07.413

Why you cannot directly go to Fragment B once received the the Intent Extra in your Activity. Just instead of defining Fragment in the xml, or as a startDestination you could simply perform switch to Fragment B

In the Activity:

       Navigation
            .findNavController(binding.root)
            .navigate(
                R.id.navigation_from_intent_actions, bundle,
                NavOptions.Builder()
                    .setIntentExtra(extras)
                    .build()
            )

UPDATE

To return to previous fragment, you can easily do with getting Fragment from the FragmentManager (it won't be killed, because it's your home Fragment). You can do it in the next way:

  private fun returnWithName() {
      val name = name_input.text.toString()

      (targetFragment as? FragmentA)?.setName(name)
      activity?.supportFragmentManager?
           .popBackStackImmediate()
  }

And later just check updated result from FragmentB. To which Fragment you need to navigate.

Note. There is also another way to share data with Shared ViewModel. However, you would need to transfer result from ViewModel back to FragmentA. And then check for new transaction parameters. It's also described here.

Since Fragment A is already set as the home destination, would it be a good approach to skip it and directly navigate to Fragment B? — Mehul Kanzariya, Nov 11 '19 at 05:44
@MehulKanzariya Yeah, it's kind of another thing. Please check the updated answer. — GensaGames, Nov 15 '19 at 17:17

Navigate to a particular fragment when app launched from sharesheet

1 Answers1