Add reusable home fragment which accepts a list type parameter for the list of emails to be displayed

Author: hunterstich

Reply/app/src/main/java/com/materialstudies/reply/data/Email.kt

@@ -17,6 +17,7 @@
 package com.materialstudies.reply.data
 
 import androidx.recyclerview.widget.DiffUtil
+import com.materialstudies.reply.ui.home.Mailbox
 
 /**
  * A simple data class to represent an Email.
@@ -29,7 +30,8 @@ data class Email(
     val body: String = "",
     val attachments: List<EmailAttachment> = emptyList(),
     var isImportant: Boolean = false,
-    var isStarred: Boolean = false
+    var isStarred: Boolean = false,
+    var mailbox: Mailbox = Mailbox.INBOX
 ) {
     val senderPreview: String = "${sender.fullName} - 4 hrs ago"
     val hasBody: Boolean = body.isNotBlank()

Reply/app/src/main/java/com/materialstudies/reply/data/EmailStore.kt

@@ -18,7 +18,9 @@ package com.materialstudies.reply.data
 
 import androidx.lifecycle.LiveData
 import androidx.lifecycle.MutableLiveData
+import androidx.lifecycle.Transformations
 import com.materialstudies.reply.R
+import com.materialstudies.reply.ui.home.Mailbox
 
 /**
  * A static data store of [Email]s.
@@ -80,7 +82,8 @@ object EmailStore {
                 I was at the grocery store on Sunday night.. when I ran into Genie Williams! I almost didn't recognize her afer 20 years!
 
                 Anyway, it turns out she is on the organizing committee for the high school reunion this fall. I don't know if you were planning on going or not, but she could definitely use our help in trying to track down lots of missing alums. If you can make it, we're doing a little phone-tree party at her place next Saturday, hoping that if we can find one person, thee more will...
-            """.trimIndent()
+            """.trimIndent(),
+            mailbox = Mailbox.SENT
         ),
         Email(
             4L,
@@ -113,25 +116,111 @@ object EmailStore {
             listOf(AccountStore.getDefaultUserAccount()),
             "Recipe to try",
             "Raspberry Pie: We should make this pie recipe tonight! The filling is " +
-                "very quick to put together."
+                "very quick to put together.",
+            mailbox = Mailbox.SENT
         ),
         Email(
             7L,
             AccountStore.getContactAccountById(9L),
             listOf(AccountStore.getDefaultUserAccount()),
             "Delivered",
             "Your shoes should be waiting for you at home!"
+        ),
+        Email(
+          8L,
+          AccountStore.getContactAccountById(13L),
+          listOf(AccountStore.getDefaultUserAccount()),
+          "Your update on Google Play Store is live!",
+          """
+              Your update, 0.1.1, is now live on the Play Store and available for your alpha users to start testing.
+              
+              Your alpha testers will be automatically notified. If you'd rather send them a link directly, go to your Google Play Console and follow the instructions for obtaining an open alpha testing link.
+          """.trimIndent(),
+          mailbox = Mailbox.TRASH
+        ),
+        Email(
+          9L,
+          AccountStore.getContactAccountById(10L),
+          listOf(AccountStore.getDefaultUserAccount()),
+          "(No subject)",
+          """
+            Hey, 
+            
+            Wanted to email and see what you thought of
+          """.trimIndent(),
+          mailbox = Mailbox.DRAFTS
+        ),
+        Email(
+          10L,
+          AccountStore.getContactAccountById(5L),
+          listOf(AccountStore.getDefaultUserAccount()),
+          "Try a free TrailGo account",
+          """
+            Looking for the best hiking trails in your area? TrailGo gets you on the path to the outdoors faster than you can pack a sandwich. 
+            
+            Whether you're an experienced hiker or just looking to get outside for the afternoon, there's a segment that suits you.
+          """.trimIndent(),
+          mailbox = Mailbox.TRASH
+        ),
+        Email(
+          10L,
+          AccountStore.getContactAccountById(5L),
+          listOf(AccountStore.getDefaultUserAccount()),
+          "Free money",
+          """
+            You've been selected as a winner in our latest raffle! To claim your prize, click on the link.
+          """.trimIndent(),
+          mailbox = Mailbox.SPAM
         )
     )
 
     private val _emails: MutableLiveData<List<Email>> = MutableLiveData()
-    val emails: LiveData<List<Email>>
-        get() = _emails
+
+    private val inbox: LiveData<List<Email>>
+        get() = Transformations.map(_emails) { emails ->
+            emails.filter { it.mailbox == Mailbox.INBOX }
+        }
+
+    private val starred: LiveData<List<Email>>
+        get() = Transformations.map(_emails) { emails ->
+            emails.filter { it.isStarred }
+        }
+
+    private val sent: LiveData<List<Email>>
+        get() = Transformations.map(_emails) { emails ->
+            emails.filter { it.mailbox == Mailbox.SENT }
+        }
+
+    private val trash: LiveData<List<Email>>
+        get() = Transformations.map(_emails) { emails ->
+            emails.filter { it.mailbox == Mailbox.TRASH }
+        }
+
+    private val spam: LiveData<List<Email>>
+        get() = Transformations.map(_emails) { emails ->
+            emails.filter { it.mailbox == Mailbox.SPAM }
+        }
+
+    private val drafts: LiveData<List<Email>>
+        get() = Transformations.map(_emails) { emails ->
+            emails.filter { it.mailbox == Mailbox.DRAFTS }
+        }
 
     init {
         _emails.value = allEmails
     }
 
+    fun getEmails(mailbox: Mailbox): LiveData<List<Email>> {
+        return when (mailbox) {
+            Mailbox.INBOX -> inbox
+            Mailbox.STARRED -> starred
+            Mailbox.SENT -> sent
+            Mailbox.TRASH -> trash
+            Mailbox.SPAM -> spam
+            Mailbox.DRAFTS -> drafts
+        }
+    }
+
     /**
      * Get an [Email] with the given [id].
      */

Reply/app/src/main/java/com/materialstudies/reply/ui/MainActivity.kt

@@ -34,6 +34,7 @@ import com.materialstudies.reply.R
 import com.materialstudies.reply.databinding.ActivityMainBinding
 import com.materialstudies.reply.ui.compose.ComposeFragmentDirections
 import com.materialstudies.reply.ui.email.EmailFragmentArgs
+import com.materialstudies.reply.ui.home.HomeFragmentDirections
 import com.materialstudies.reply.ui.nav.AlphaSlideAction
 import com.materialstudies.reply.ui.nav.BottomNavDrawerFragment
 import com.materialstudies.reply.ui.nav.ChangeSettingsMenuStateAction
@@ -222,8 +223,7 @@ class MainActivity : AppCompatActivity(),
 
     override fun onNavMenuItemClicked(item: NavigationModelItem.NavMenuItem) {
         // Swap the list of emails showing
-        binding.bottomAppBarTitle.text = getString(item.titleRes)
-        // TODO:
+        navigateToMailbox(item)
     }
 
     override fun onNavEmailFolderClicked(folder: NavigationModelItem.NavEmailFolder) {
@@ -247,6 +247,12 @@ class MainActivity : AppCompatActivity(),
         }.show(supportFragmentManager, null)
     }
 
+    private fun navigateToMailbox(item: NavigationModelItem.NavMenuItem) {
+        binding.bottomAppBarTitle.text = getString(item.titleRes)
+        findNavController(R.id.nav_host_fragment)
+            .navigate(HomeFragmentDirections.actionHomeFragmentToHomeFragment(item.mailbox))
+    }
+
     private fun navigateToCompose() {
         supportFragmentManager.currentNavigationFragment?.setOutgoingTransitions(
                 exitTransition = Hold().apply {

Reply/app/src/main/java/com/materialstudies/reply/ui/home/HomeFragment.kt

@@ -25,6 +25,7 @@ import androidx.fragment.app.Fragment
 import androidx.lifecycle.observe
 import androidx.navigation.fragment.FragmentNavigatorExtras
 import androidx.navigation.fragment.findNavController
+import androidx.navigation.fragment.navArgs
 import androidx.recyclerview.widget.ItemTouchHelper
 import com.google.android.material.transition.Hold
 import com.materialstudies.reply.R
@@ -39,6 +40,8 @@ import com.materialstudies.reply.util.setOutgoingTransitions
  */
 class HomeFragment : Fragment(), EmailAdapter.EmailAdapterListener {
 
+    private val args: HomeFragmentArgs by navArgs()
+
     private lateinit var binding: FragmentHomeBinding
 
     private val emailAdapter = EmailAdapter(this)
@@ -66,7 +69,7 @@ class HomeFragment : Fragment(), EmailAdapter.EmailAdapterListener {
         }
         binding.recyclerView.adapter = emailAdapter
 
-        EmailStore.emails.observe(viewLifecycleOwner) {
+        EmailStore.getEmails(args.listType).observe(viewLifecycleOwner) {
             emailAdapter.submitList(it)
         }
     }

Reply/app/src/main/java/com/materialstudies/reply/ui/home/Mailbox.kt

@@ -0,0 +1,8 @@
+package com.materialstudies.reply.ui.home
+
+/**
+ * An enumeration of mailboxes into which emails can be placed.
+ */
+enum class Mailbox {
+  INBOX, STARRED, SENT, TRASH, SPAM, DRAFTS
+}

Reply/app/src/main/java/com/materialstudies/reply/ui/nav/BottomNavDrawerFragment.kt

@@ -277,7 +277,8 @@ class BottomNavDrawerFragment :
     }
 
     override fun onNavMenuItemClicked(item: NavigationModelItem.NavMenuItem) {
-        if (NavigationModel.setNavigationMenuItemChecked(item.id)) close()
+        NavigationModel.setNavigationMenuItemChecked(item.id)
+        close()
         navigationListeners.forEach { it.onNavMenuItemClicked(item) }
     }
 

Reply/app/src/main/java/com/materialstudies/reply/ui/nav/NavigationModel.kt

@@ -20,6 +20,7 @@ import androidx.lifecycle.LiveData
 import androidx.lifecycle.MutableLiveData
 import com.materialstudies.reply.R
 import com.materialstudies.reply.data.EmailStore
+import com.materialstudies.reply.ui.home.Mailbox
 
 /**
  * A class which maintains and generates a navigation list to be displayed by [NavigationAdapter].
@@ -31,37 +32,43 @@ object NavigationModel {
             id = 0,
             icon = R.drawable.ic_twotone_inbox,
             titleRes = R.string.navigation_inbox,
-            checked = false
+            checked = false,
+            mailbox = Mailbox.INBOX
         ),
         NavigationModelItem.NavMenuItem(
             id = 1,
             icon = R.drawable.ic_twotone_stars,
             titleRes = R.string.navigation_starred,
-            checked = false
+            checked = false,
+            mailbox = Mailbox.STARRED
         ),
         NavigationModelItem.NavMenuItem(
             id = 2,
             icon = R.drawable.ic_twotone_send,
             titleRes = R.string.navigation_sent,
-            checked = false
+            checked = false,
+            mailbox = Mailbox.SENT
         ),
         NavigationModelItem.NavMenuItem(
             id = 3,
             icon = R.drawable.ic_twotone_delete,
             titleRes = R.string.navigation_trash,
-            checked = false
+            checked = false,
+            mailbox = Mailbox.TRASH
         ),
         NavigationModelItem.NavMenuItem(
             id = 4,
             icon = R.drawable.ic_twotone_error,
             titleRes = R.string.navigation_spam,
-            checked = false
+            checked = false,
+            mailbox = Mailbox.SPAM
         ),
         NavigationModelItem.NavMenuItem(
             id = 5,
             icon = R.drawable.ic_twotone_drafts,
             titleRes = R.string.navigation_drafts,
-            checked = false
+            checked = false,
+            mailbox = Mailbox.DRAFTS
         )
     )
 

Reply/app/src/main/java/com/materialstudies/reply/ui/nav/NavigationModelItem.kt

@@ -21,6 +21,7 @@ import androidx.annotation.StringRes
 import androidx.recyclerview.widget.DiffUtil
 import com.materialstudies.reply.data.EmailFolder
 import com.materialstudies.reply.data.EmailFolderDiff
+import com.materialstudies.reply.ui.home.Mailbox
 
 /**
  * A sealed class which encapsulates all objects [NavigationAdapter] is able to display.
@@ -34,6 +35,7 @@ sealed class NavigationModelItem {
         val id: Int,
         @DrawableRes val icon: Int,
         @StringRes val titleRes: Int,
+        val mailbox: Mailbox,
         var checked: Boolean
     ) : NavigationModelItem()
 

Reply/app/src/main/res/navigation/navigation_graph.xml

@@ -19,10 +19,18 @@
     <fragment
         android:id="@+id/homeFragment"
         android:name="com.materialstudies.reply.ui.home.HomeFragment"
-        android:label="HomeFragment" >
+        android:label="HomeFragment">
+        <argument
+            android:name="listType"
+            app:argType="com.materialstudies.reply.ui.home.EmailListType"
+            android:defaultValue="INBOX"/>
         <action
             android:id="@+id/action_homeFragment_to_emailFragment"
             app:destination="@id/emailFragment" />
+        <action
+            android:id="@+id/action_homeFragment_to_homeFragment"
+            app:destination="@+id/homeFragment"
+            app:launchSingleTop="true"/>
     </fragment>
     <fragment
         android:id="@+id/emailFragment"