Fix #577: Display profile name on navigation drawer.

app/src/main/java/org/oppia/app/drawer/NavigationDrawerFragmentPresenter.kt

@@ -6,32 +6,81 @@ import android.view.MenuItem
 import android.view.View
 import android.view.ViewGroup
 import androidx.appcompat.app.ActionBarDrawerToggle
+import androidx.appcompat.app.AppCompatActivity
 import androidx.appcompat.widget.Toolbar
 import androidx.drawerlayout.widget.DrawerLayout
 import androidx.fragment.app.Fragment
+import androidx.lifecycle.LiveData
+import androidx.lifecycle.Observer
+import androidx.lifecycle.Transformations
 import com.google.android.material.navigation.NavigationView
 import org.oppia.app.R
+import org.oppia.app.databinding.DrawerFragmentBinding
+import org.oppia.app.databinding.NavHeaderNavigationDrawerBinding
 import org.oppia.app.fragment.FragmentScope
 import org.oppia.app.help.HelpActivity
 import org.oppia.app.home.HomeActivity
+import org.oppia.app.home.KEY_HOME_PROFILE_ID
+import org.oppia.app.model.Profile
+import org.oppia.app.model.ProfileId
+import org.oppia.domain.profile.ProfileManagementController
+import org.oppia.util.data.AsyncResult
+import org.oppia.util.logging.Logger
 import javax.inject.Inject
 
 /** The presenter for [NavigationDrawerFragment]. */
 @FragmentScope
 class NavigationDrawerFragmentPresenter @Inject constructor(
-  private val fragment: Fragment
+  private val activity: AppCompatActivity,
+  private val fragment: Fragment,
+  private val profileManagementController: ProfileManagementController,
+  private val logger: Logger
 ) : NavigationView.OnNavigationItemSelectedListener {
-  private lateinit var navView: NavigationView
   private lateinit var drawerToggle: ActionBarDrawerToggle
   private lateinit var drawerLayout: DrawerLayout
   private var previousMenuItemId: Int? = null
+  private lateinit var binding: DrawerFragmentBinding
+  private var internalProfileId: Int = -1
+  private lateinit var profileId: ProfileId
+  private lateinit var navigationDrawerHeaderViewModel: NavigationDrawerHeaderViewModel
 
   fun handleCreateView(inflater: LayoutInflater, container: ViewGroup?): View? {
-    val view: View? = inflater.inflate(R.layout.fragment_drawer, container, false)
-    navView = view!!.findViewById(R.id.fragment_drawer_nav_view)
-    navView.setNavigationItemSelectedListener(this)
+    binding = DrawerFragmentBinding.inflate(inflater, container, /* attachToRoot= */ false)
+    binding.fragmentDrawerNavView.setNavigationItemSelectedListener(this)
+
     fragment.setHasOptionsMenu(true)
-    return view
+
+    internalProfileId = activity.intent.getIntExtra(KEY_HOME_PROFILE_ID, -1)
+    profileId = ProfileId.newBuilder().setInternalId(internalProfileId).build()
+
+  navigationDrawerHeaderViewModel = NavigationDrawerHeaderViewModel()
+
+    val headerBinding = NavHeaderNavigationDrawerBinding.inflate(inflater, container, /* attachToRoot= */ false)
+    headerBinding.viewModel = navigationDrawerHeaderViewModel
+    subscribeToProfileLiveData()
+
+    binding.fragmentDrawerNavView.addHeaderView(headerBinding.root)
+    binding.executePendingBindings()
+
+
+    return binding.root
+  }
+
+  private fun getProfileData(): LiveData<Profile> {
+    return Transformations.map(profileManagementController.getProfile(profileId), ::processGetProfileResult)
+  }
+
+  private fun subscribeToProfileLiveData() {
+    getProfileData().observe(fragment, Observer<Profile> {
+      navigationDrawerHeaderViewModel.profileName.set(it.name)
+    })
+  }
+
+  private fun processGetProfileResult(profileResult: AsyncResult<Profile>): Profile {
+    if (profileResult.isFailure()) {
+      logger.e("NavigationDrawerFragmentPresenter", "Failed to retrieve profile", profileResult.getErrorOrNull()!!)
+    }
+    return profileResult.getOrDefault(Profile.getDefaultInstance())
   }
 
   private fun openActivityByMenuItemId(menuItemId: Int) {
@@ -58,10 +107,10 @@ class NavigationDrawerFragmentPresenter @Inject constructor(
   fun setUpDrawer(drawerLayout: DrawerLayout, toolbar: Toolbar, menuItemId: Int) {
     when (NavigationDrawerItem.valueFromNavId(menuItemId)) {
       NavigationDrawerItem.HOME -> {
-        navView.menu.getItem(NavigationDrawerItem.HOME.ordinal).isChecked = true
+        binding.fragmentDrawerNavView.menu.getItem(NavigationDrawerItem.HOME.ordinal).isChecked = true
       }
       NavigationDrawerItem.HELP -> {
-        navView.menu.getItem(NavigationDrawerItem.HELP.ordinal).isChecked = true
+        binding.fragmentDrawerNavView.menu.getItem(NavigationDrawerItem.HELP.ordinal).isChecked = true
       }
     }
     this.drawerLayout = drawerLayout

app/src/main/java/org/oppia/app/drawer/NavigationDrawerHeaderViewModel.kt

@@ -0,0 +1,9 @@
+package org.oppia.app.drawer
+
+import androidx.databinding.ObservableField
+import org.oppia.app.viewmodel.ObservableViewModel
+import javax.inject.Inject
+
+class NavigationDrawerHeaderViewModel @Inject constructor(): ObservableViewModel() {
+  val profileName = ObservableField<String>("")
+}

app/src/main/java/org/oppia/app/testing/NavigationDrawerTestActivity.kt

@@ -1,9 +1,12 @@
 package org.oppia.app.testing
 
+import android.content.Context
+import android.content.Intent
 import android.os.Bundle
 import org.oppia.app.R
 import org.oppia.app.activity.InjectableAppCompatActivity
 import org.oppia.app.home.HomeActivityPresenter
+import org.oppia.app.home.KEY_HOME_PROFILE_ID
 import org.oppia.app.home.RouteToTopicListener
 import org.oppia.app.topic.TopicActivity
 import javax.inject.Inject
@@ -12,6 +15,13 @@ class NavigationDrawerTestActivity : InjectableAppCompatActivity(), RouteToTopic
   @Inject
   lateinit var homeActivityPresenter: HomeActivityPresenter
 
+  companion object {
+    fun createNavigationDrawerTestActivity(context: Context, profileId: Int?): Intent {
+      val intent = Intent(context, NavigationDrawerTestActivity::class.java)
+      intent.putExtra(KEY_HOME_PROFILE_ID, profileId)
+      return intent
+    }
+  }
   override fun onCreate(savedInstanceState: Bundle?) {
     super.onCreate(savedInstanceState)
     activityComponent.inject(this)

app/src/main/res/layout/drawer_fragment.xml

@@ -0,0 +1,42 @@
+<?xml version="1.0" encoding="utf-8"?>
+<layout xmlns:android="http://schemas.android.com/apk/res/android"
+  xmlns:app="http://schemas.android.com/apk/res-auto">
+
+  <com.google.android.material.navigation.NavigationView
+    android:id="@+id/fragment_drawer_nav_view"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:layout_gravity="start"
+    android:fitsSystemWindows="true"
+    app:itemBackground="@android:color/transparent"
+    app:itemIconTint="@color/drawer_item"
+    app:itemTextColor="@color/drawer_item"
+    app:menu="@menu/navigation_drawer_menu">
+
+    <LinearLayout
+      android:layout_width="match_parent"
+      android:layout_height="wrap_content"
+      android:layout_gravity="bottom"
+      android:orientation="horizontal"
+      android:padding="16dp">
+
+      <ImageView
+        android:layout_width="24dp"
+        android:layout_height="24dp"
+        android:layout_gravity="center_vertical"
+        android:layout_margin="12dp"
+        android:src="@drawable/ic_admin_settings_icon_grey_24dp" />
+
+      <TextView
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:layout_gravity="center_vertical"
+        android:layout_marginStart="32dp"
+        android:layout_marginEnd="32dp"
+        android:fontFamily="sans-serif-medium"
+        android:text="@string/admin_settings"
+        android:textColor="@color/black"
+        android:textSize="14sp" />
+    </LinearLayout>
+  </com.google.android.material.navigation.NavigationView>
+</layout>

app/src/main/res/layout/help_activity.xml

@@ -26,6 +26,6 @@
     android:layout_width="match_parent"
     android:layout_height="match_parent"
     android:layout_gravity="start"
-    app:layout="@layout/fragment_drawer"
-    tools:layout="@layout/fragment_drawer" />
+    app:layout="@layout/drawer_fragment"
+    tools:layout="@layout/drawer_fragment" />
 </androidx.drawerlayout.widget.DrawerLayout>

app/src/main/res/layout/home_activity.xml

@@ -28,6 +28,6 @@
     android:layout_width="match_parent"
     android:layout_height="match_parent"
     android:layout_gravity="start"
-    app:layout="@layout/fragment_drawer"
-    tools:layout="@layout/fragment_drawer" />
+    app:layout="@layout/drawer_fragment"
+    tools:layout="@layout/drawer_fragment" />
 </androidx.drawerlayout.widget.DrawerLayout>

app/src/main/res/layout/nav_header_navigation_drawer.xml

@@ -1,39 +1,49 @@
 <?xml version="1.0" encoding="utf-8"?>
-<LinearLayout 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="176dp"
-  android:background="@drawable/side_nav_bar"
-  android:gravity="bottom"
-  android:orientation="vertical"
-  android:paddingStart="@dimen/activity_horizontal_margin"
-  android:paddingTop="@dimen/activity_vertical_margin"
-  android:paddingEnd="@dimen/activity_horizontal_margin"
-  android:paddingBottom="@dimen/activity_vertical_margin"
-  android:theme="@style/ThemeOverlay.AppCompat.Dark">
+<layout xmlns:android="http://schemas.android.com/apk/res/android"
+  xmlns:app="http://schemas.android.com/apk/res-auto">
 
-  <ImageView
-    android:layout_width="64dp"
-    android:layout_height="64dp"
-    android:contentDescription="@string/nav_header_desc"
-    android:paddingTop="8dp"
-    app:srcCompat="@mipmap/ic_launcher_round" />
+  <data>
+    <variable
+      name="viewModel"
+      type="org.oppia.app.drawer.NavigationDrawerHeaderViewModel" />
+  </data>
 
-  <TextView
+  <LinearLayout
     android:layout_width="match_parent"
-    android:layout_height="wrap_content"
-    android:fontFamily="sans-serif-medium"
-    android:paddingTop="8dp"
-    android:textColor="@color/white"
-    android:text="@string/nav_header_title"
-    android:textAppearance="@style/TextAppearance.AppCompat.Body1"
-    android:textSize="14sp" />
+    android:layout_height="176dp"
+    android:background="@drawable/side_nav_bar"
+    android:gravity="bottom"
+    android:orientation="vertical"
+    android:paddingStart="@dimen/activity_horizontal_margin"
+    android:paddingTop="@dimen/activity_vertical_margin"
+    android:paddingEnd="@dimen/activity_horizontal_margin"
+    android:paddingBottom="@dimen/activity_vertical_margin"
+    android:theme="@style/ThemeOverlay.AppCompat.Dark">
 
-  <TextView
-    android:layout_width="wrap_content"
-    android:layout_height="wrap_content"
-    android:fontFamily="sans-serif"
-    android:textColor="@color/white"
-    android:text="@string/nav_header_subtitle"
-    android:textSize="14sp" />
-</LinearLayout>
+    <ImageView
+      android:layout_width="64dp"
+      android:layout_height="64dp"
+      android:contentDescription="@string/nav_header_desc"
+      android:paddingTop="8dp"
+      app:srcCompat="@mipmap/ic_launcher_round" />
+
+    <TextView
+      android:id="@+id/nav_header_profile_name"
+      android:layout_width="match_parent"
+      android:layout_height="wrap_content"
+      android:fontFamily="sans-serif-medium"
+      android:paddingTop="8dp"
+      android:text="@{viewModel.profileName}"
+      android:textAppearance="@style/TextAppearance.AppCompat.Body1"
+      android:textColor="@color/white"
+      android:textSize="14sp" />
+
+    <TextView
+      android:layout_width="wrap_content"
+      android:layout_height="wrap_content"
+      android:fontFamily="sans-serif"
+      android:text="@string/nav_header_subtitle"
+      android:textColor="@color/white"
+      android:textSize="14sp" />
+  </LinearLayout>
+</layout>