diff --git a/app/src/main/java/org/oppia/android/app/administratorcontrols/AdministratorControlsActivity.kt b/app/src/main/java/org/oppia/android/app/administratorcontrols/AdministratorControlsActivity.kt
index 2cda2286d02..64beda78f53 100644
--- a/app/src/main/java/org/oppia/android/app/administratorcontrols/AdministratorControlsActivity.kt
+++ b/app/src/main/java/org/oppia/android/app/administratorcontrols/AdministratorControlsActivity.kt
@@ -3,6 +3,7 @@ package org.oppia.android.app.administratorcontrols
 import android.content.Context
 import android.content.Intent
 import android.os.Bundle
+import androidx.activity.OnBackPressedCallback
 import org.oppia.android.R
 import org.oppia.android.app.activity.ActivityComponentImpl
 import org.oppia.android.app.activity.InjectableAutoLocalizedAppCompatActivity
@@ -83,6 +84,15 @@ class AdministratorControlsActivity :
       isProfileDeletionDialogVisible
     )
     title = resourceHandler.getStringInLocale(R.string.administrator_controls)
+
+    onBackPressedDispatcher.addCallback(
+      this,
+      object : OnBackPressedCallback(/* enabled = */ true) {
+        override fun handleOnBackPressed() {
+          this@AdministratorControlsActivity.handleBackPress()
+        }
+      }
+    )
   }
 
   override fun routeToAppVersion() {
@@ -121,7 +131,7 @@ class AdministratorControlsActivity :
     }
   }
 
-  override fun onBackPressed() {
+  private fun handleBackPress() {
     val fragment =
       supportFragmentManager.findFragmentById(
         R.id.administrator_controls_fragment_multipane_placeholder
@@ -134,8 +144,7 @@ class AdministratorControlsActivity :
     if (fragment is ProfileEditFragment) {
       administratorControlsActivityPresenter.handleOnBackPressed()
     } else {
-      @Suppress("DEPRECATION") // TODO(#5404): Migrate to a back pressed dispatcher.
-      super.onBackPressed()
+      finish()
     }
   }
 
diff --git a/app/src/main/java/org/oppia/android/app/administratorcontrols/appversion/AppVersionActivity.kt b/app/src/main/java/org/oppia/android/app/administratorcontrols/appversion/AppVersionActivity.kt
index e41600bb929..f78d770df1d 100644
--- a/app/src/main/java/org/oppia/android/app/administratorcontrols/appversion/AppVersionActivity.kt
+++ b/app/src/main/java/org/oppia/android/app/administratorcontrols/appversion/AppVersionActivity.kt
@@ -4,6 +4,7 @@ import android.content.Context
 import android.content.Intent
 import android.os.Bundle
 import android.view.MenuItem
+import androidx.activity.OnBackPressedCallback
 import org.oppia.android.app.activity.ActivityComponentImpl
 import org.oppia.android.app.activity.InjectableAutoLocalizedAppCompatActivity
 import org.oppia.android.app.model.ScreenName.APP_VERSION_ACTIVITY
@@ -19,12 +20,20 @@ class AppVersionActivity : InjectableAutoLocalizedAppCompatActivity() {
     super.onCreate(savedInstanceState)
     (activityComponent as ActivityComponentImpl).inject(this)
     appVersionActivityPresenter.handleOnCreate()
+
+    onBackPressedDispatcher.addCallback(
+      this,
+      object : OnBackPressedCallback(/* enabled = */ true) {
+        override fun handleOnBackPressed() {
+          finish()
+        }
+      }
+    )
   }
 
   override fun onOptionsItemSelected(item: MenuItem): Boolean {
     if (item.itemId == android.R.id.home) {
-      @Suppress("DEPRECATION") // TODO(#5404): Migrate to a back pressed dispatcher.
-      onBackPressed()
+      onBackPressedDispatcher.onBackPressed()
     }
     return super.onOptionsItemSelected(item)
   }
diff --git a/app/src/main/java/org/oppia/android/app/administratorcontrols/learneranalytics/ProfileAndDeviceIdActivity.kt b/app/src/main/java/org/oppia/android/app/administratorcontrols/learneranalytics/ProfileAndDeviceIdActivity.kt
index cf6fb025db6..45a27fac5b8 100644
--- a/app/src/main/java/org/oppia/android/app/administratorcontrols/learneranalytics/ProfileAndDeviceIdActivity.kt
+++ b/app/src/main/java/org/oppia/android/app/administratorcontrols/learneranalytics/ProfileAndDeviceIdActivity.kt
@@ -4,6 +4,7 @@ import android.content.Context
 import android.content.Intent
 import android.os.Bundle
 import android.view.MenuItem
+import androidx.activity.OnBackPressedCallback
 import org.oppia.android.app.activity.ActivityComponentImpl
 import org.oppia.android.app.activity.InjectableAutoLocalizedAppCompatActivity
 import org.oppia.android.app.model.ScreenName.PROFILE_AND_DEVICE_ID_ACTIVITY
@@ -18,18 +19,27 @@ import javax.inject.Inject
  * a particular user or group.
  */
 class ProfileAndDeviceIdActivity : InjectableAutoLocalizedAppCompatActivity() {
-  @Inject lateinit var profileAndDeviceIdActivityPresenter: ProfileAndDeviceIdActivityPresenter
+  @Inject
+  lateinit var profileAndDeviceIdActivityPresenter: ProfileAndDeviceIdActivityPresenter
 
   override fun onCreate(savedInstanceState: Bundle?) {
     super.onCreate(savedInstanceState)
     (activityComponent as ActivityComponentImpl).inject(this)
     profileAndDeviceIdActivityPresenter.handleOnCreate()
+
+    onBackPressedDispatcher.addCallback(
+      this,
+      object : OnBackPressedCallback(/* enabled = */ true) {
+        override fun handleOnBackPressed() {
+          finish()
+        }
+      }
+    )
   }
 
   override fun onOptionsItemSelected(item: MenuItem): Boolean {
     if (item.itemId == android.R.id.home) {
-      @Suppress("DEPRECATION") // TODO(#5404): Migrate to a back pressed dispatcher.
-      onBackPressed()
+      onBackPressedDispatcher.onBackPressed()
     }
     return super.onOptionsItemSelected(item)
   }
diff --git a/app/src/main/java/org/oppia/android/app/devoptions/markchapterscompleted/MarkChaptersCompletedActivity.kt b/app/src/main/java/org/oppia/android/app/devoptions/markchapterscompleted/MarkChaptersCompletedActivity.kt
index ec8979dad41..cc1a7897150 100644
--- a/app/src/main/java/org/oppia/android/app/devoptions/markchapterscompleted/MarkChaptersCompletedActivity.kt
+++ b/app/src/main/java/org/oppia/android/app/devoptions/markchapterscompleted/MarkChaptersCompletedActivity.kt
@@ -4,6 +4,7 @@ import android.content.Context
 import android.content.Intent
 import android.os.Bundle
 import android.view.MenuItem
+import androidx.activity.OnBackPressedCallback
 import org.oppia.android.R
 import org.oppia.android.app.activity.ActivityComponentImpl
 import org.oppia.android.app.activity.InjectableAutoLocalizedAppCompatActivity
@@ -37,12 +38,20 @@ class MarkChaptersCompletedActivity : InjectableAutoLocalizedAppCompatActivity()
     val showConfirmationNotice = args?.showConfirmationNotice ?: false
     markChaptersCompletedActivityPresenter.handleOnCreate(internalProfileId, showConfirmationNotice)
     title = resourceHandler.getStringInLocale(R.string.mark_chapters_completed_activity_title)
+
+    onBackPressedDispatcher.addCallback(
+      this,
+      object : OnBackPressedCallback(/* enabled = */ true) {
+        override fun handleOnBackPressed() {
+          finish()
+        }
+      }
+    )
   }
 
   override fun onOptionsItemSelected(item: MenuItem): Boolean {
     if (item.itemId == android.R.id.home) {
-      @Suppress("DEPRECATION") // TODO(#5404): Migrate to a back pressed dispatcher.
-      onBackPressed()
+      onBackPressedDispatcher.onBackPressed()
     }
     return super.onOptionsItemSelected(item)
   }
diff --git a/app/src/main/java/org/oppia/android/app/devoptions/markstoriescompleted/MarkStoriesCompletedActivity.kt b/app/src/main/java/org/oppia/android/app/devoptions/markstoriescompleted/MarkStoriesCompletedActivity.kt
index e3373fc7df6..86bb96b2f8d 100644
--- a/app/src/main/java/org/oppia/android/app/devoptions/markstoriescompleted/MarkStoriesCompletedActivity.kt
+++ b/app/src/main/java/org/oppia/android/app/devoptions/markstoriescompleted/MarkStoriesCompletedActivity.kt
@@ -4,6 +4,7 @@ import android.content.Context
 import android.content.Intent
 import android.os.Bundle
 import android.view.MenuItem
+import androidx.activity.OnBackPressedCallback
 import org.oppia.android.R
 import org.oppia.android.app.activity.ActivityComponentImpl
 import org.oppia.android.app.activity.InjectableAutoLocalizedAppCompatActivity
@@ -34,12 +35,20 @@ class MarkStoriesCompletedActivity : InjectableAutoLocalizedAppCompatActivity()
     internalProfileId = profileId?.internalId ?: -1
     markStoriesCompletedActivityPresenter.handleOnCreate(internalProfileId)
     title = resourceHandler.getStringInLocale(R.string.mark_stories_completed_activity_title)
+
+    onBackPressedDispatcher.addCallback(
+      this,
+      object : OnBackPressedCallback(/* enabled = */ true) {
+        override fun handleOnBackPressed() {
+          finish()
+        }
+      }
+    )
   }
 
   override fun onOptionsItemSelected(item: MenuItem): Boolean {
     if (item.itemId == android.R.id.home) {
-      @Suppress("DEPRECATION") // TODO(#5404): Migrate to a back pressed dispatcher.
-      onBackPressed()
+      onBackPressedDispatcher.onBackPressed()
     }
     return super.onOptionsItemSelected(item)
   }
diff --git a/app/src/main/java/org/oppia/android/app/devoptions/marktopicscompleted/MarkTopicsCompletedActivity.kt b/app/src/main/java/org/oppia/android/app/devoptions/marktopicscompleted/MarkTopicsCompletedActivity.kt
index a891de3a059..606c4f70bd0 100644
--- a/app/src/main/java/org/oppia/android/app/devoptions/marktopicscompleted/MarkTopicsCompletedActivity.kt
+++ b/app/src/main/java/org/oppia/android/app/devoptions/marktopicscompleted/MarkTopicsCompletedActivity.kt
@@ -4,6 +4,7 @@ import android.content.Context
 import android.content.Intent
 import android.os.Bundle
 import android.view.MenuItem
+import androidx.activity.OnBackPressedCallback
 import org.oppia.android.R
 import org.oppia.android.app.activity.ActivityComponentImpl
 import org.oppia.android.app.activity.InjectableAutoLocalizedAppCompatActivity
@@ -34,12 +35,20 @@ class MarkTopicsCompletedActivity : InjectableAutoLocalizedAppCompatActivity() {
     internalProfileId = profileId?.internalId ?: -1
     markTopicsCompletedActivityPresenter.handleOnCreate(internalProfileId)
     title = resourceHandler.getStringInLocale(R.string.mark_topics_completed_activity_title)
+
+    onBackPressedDispatcher.addCallback(
+      this,
+      object : OnBackPressedCallback(/* enabled = */ true) {
+        override fun handleOnBackPressed() {
+          finish()
+        }
+      }
+    )
   }
 
   override fun onOptionsItemSelected(item: MenuItem): Boolean {
     if (item.itemId == android.R.id.home) {
-      @Suppress("DEPRECATION") // TODO(#5404): Migrate to a back pressed dispatcher.
-      onBackPressed()
+      onBackPressedDispatcher.onBackPressed()
     }
     return super.onOptionsItemSelected(item)
   }
diff --git a/app/src/main/java/org/oppia/android/app/options/ReadingTextSizeActivity.kt b/app/src/main/java/org/oppia/android/app/options/ReadingTextSizeActivity.kt
index e88525841b5..054a4d8e54b 100644
--- a/app/src/main/java/org/oppia/android/app/options/ReadingTextSizeActivity.kt
+++ b/app/src/main/java/org/oppia/android/app/options/ReadingTextSizeActivity.kt
@@ -3,6 +3,7 @@ package org.oppia.android.app.options
 import android.content.Context
 import android.content.Intent
 import android.os.Bundle
+import androidx.activity.OnBackPressedCallback
 import org.oppia.android.app.activity.ActivityComponentImpl
 import org.oppia.android.app.activity.InjectableAutoLocalizedAppCompatActivity
 import org.oppia.android.app.model.ReadingTextSize
@@ -34,6 +35,22 @@ class ReadingTextSizeActivity : InjectableAutoLocalizedAppCompatActivity() {
       savedInstanceState?.retrieveStateBundle()?.selectedReadingTextSize
         ?: retrieveActivityParams().readingTextSize
     readingTextSizeActivityPresenter.handleOnCreate(readingTextSize)
+
+    onBackPressedDispatcher.addCallback(
+      this,
+      object : OnBackPressedCallback(/* enabled = */ true) {
+        override fun handleOnBackPressed() {
+          val resultBundle = ReadingTextSizeActivityResultBundle.newBuilder().apply {
+            selectedReadingTextSize = readingTextSizeActivityPresenter.getSelectedReadingTextSize()
+          }.build()
+          val intent = Intent().apply {
+            putProtoExtra(MESSAGE_READING_TEXT_SIZE_RESULTS_KEY, resultBundle)
+          }
+          setResult(RESULT_OK, intent)
+          finish()
+        }
+      }
+    )
   }
 
   companion object {
@@ -60,17 +77,6 @@ class ReadingTextSizeActivity : InjectableAutoLocalizedAppCompatActivity() {
     outState.putProto(ACTIVITY_SAVED_STATE_KEY, stateBundle)
   }
 
-  override fun onBackPressed() {
-    val resultBundle = ReadingTextSizeActivityResultBundle.newBuilder().apply {
-      selectedReadingTextSize = readingTextSizeActivityPresenter.getSelectedReadingTextSize()
-    }.build()
-    val intent = Intent().apply {
-      putProtoExtra(MESSAGE_READING_TEXT_SIZE_RESULTS_KEY, resultBundle)
-    }
-    setResult(RESULT_OK, intent)
-    finish()
-  }
-
   private fun retrieveActivityParams() =
     intent.getProtoExtra(ACTIVITY_PARAMS_KEY, ReadingTextSizeActivityParams.getDefaultInstance())
 
diff --git a/app/src/main/java/org/oppia/android/app/options/ReadingTextSizeActivityPresenter.kt b/app/src/main/java/org/oppia/android/app/options/ReadingTextSizeActivityPresenter.kt
index 85eedd9d379..491ad80fb11 100644
--- a/app/src/main/java/org/oppia/android/app/options/ReadingTextSizeActivityPresenter.kt
+++ b/app/src/main/java/org/oppia/android/app/options/ReadingTextSizeActivityPresenter.kt
@@ -28,8 +28,7 @@ class ReadingTextSizeActivityPresenter @Inject constructor(
   private fun setToolbar() {
     val readingTextSizeToolbar: Toolbar = activity.findViewById(R.id.reading_text_size_toolbar)
     readingTextSizeToolbar.setNavigationOnClickListener {
-      @Suppress("DEPRECATION") // TODO(#5404): Migrate to a back pressed dispatcher.
-      activity.onBackPressed()
+      activity.onBackPressedDispatcher.onBackPressed()
     }
   }
 
diff --git a/app/src/main/java/org/oppia/android/app/player/exploration/ExplorationActivity.kt b/app/src/main/java/org/oppia/android/app/player/exploration/ExplorationActivity.kt
index 6912d639ed9..d9519c01e2a 100755
--- a/app/src/main/java/org/oppia/android/app/player/exploration/ExplorationActivity.kt
+++ b/app/src/main/java/org/oppia/android/app/player/exploration/ExplorationActivity.kt
@@ -3,6 +3,7 @@ package org.oppia.android.app.player.exploration
 import android.content.Context
 import android.content.Intent
 import android.os.Bundle
+import androidx.activity.OnBackPressedCallback
 import org.oppia.android.app.activity.ActivityComponentImpl
 import org.oppia.android.app.activity.InjectableAutoLocalizedAppCompatActivity
 import org.oppia.android.app.hintsandsolution.HintsAndSolutionDialogFragment
@@ -48,7 +49,8 @@ class ExplorationActivity :
   BottomSheetOptionsMenuItemClickListener,
   RequestVoiceOverIconSpotlightListener {
 
-  @Inject lateinit var explorationActivityPresenter: ExplorationActivityPresenter
+  @Inject
+  lateinit var explorationActivityPresenter: ExplorationActivityPresenter
   private lateinit var state: State
   private lateinit var writtenTranslationContext: WrittenTranslationContext
 
@@ -67,6 +69,14 @@ class ExplorationActivity :
       params.parentScreen,
       params.isCheckpointingEnabled
     )
+    onBackPressedDispatcher.addCallback(
+      this,
+      object : OnBackPressedCallback(/* enabled = */ true) {
+        override fun handleOnBackPressed() {
+          explorationActivityPresenter.backButtonPressed()
+        }
+      }
+    )
   }
 
   // TODO(#1655): Re-restrict access to fields in tests post-Gradle.
@@ -114,10 +124,6 @@ class ExplorationActivity :
       getProtoExtra(PARAMS_KEY, ExplorationActivityParams.getDefaultInstance())
   }
 
-  override fun onBackPressed() {
-    explorationActivityPresenter.backButtonPressed()
-  }
-
   override fun deleteCurrentProgressAndStopSession(isCompletion: Boolean) {
     explorationActivityPresenter.deleteCurrentProgressAndStopExploration(isCompletion)
   }
diff --git a/app/src/main/java/org/oppia/android/app/player/exploration/ExplorationActivityPresenter.kt b/app/src/main/java/org/oppia/android/app/player/exploration/ExplorationActivityPresenter.kt
index 1c493c19bfa..4049f5dc4a2 100644
--- a/app/src/main/java/org/oppia/android/app/player/exploration/ExplorationActivityPresenter.kt
+++ b/app/src/main/java/org/oppia/android/app/player/exploration/ExplorationActivityPresenter.kt
@@ -113,8 +113,7 @@ class ExplorationActivityPresenter @Inject constructor(
     }
 
     binding.explorationToolbar.setNavigationOnClickListener {
-      @Suppress("DEPRECATION") // TODO(#5404): Migrate to a back pressed dispatcher.
-      activity.onBackPressed()
+      activity.onBackPressedDispatcher.onBackPressed()
     }
 
     binding.actionAudioPlayer.setOnClickListener {
diff --git a/app/src/main/java/org/oppia/android/app/resumelesson/ResumeLessonActivity.kt b/app/src/main/java/org/oppia/android/app/resumelesson/ResumeLessonActivity.kt
index fc63898ac40..4e268b486c2 100644
--- a/app/src/main/java/org/oppia/android/app/resumelesson/ResumeLessonActivity.kt
+++ b/app/src/main/java/org/oppia/android/app/resumelesson/ResumeLessonActivity.kt
@@ -3,6 +3,7 @@ package org.oppia.android.app.resumelesson
 import android.content.Context
 import android.content.Intent
 import android.os.Bundle
+import androidx.activity.OnBackPressedCallback
 import org.oppia.android.app.activity.ActivityComponentImpl
 import org.oppia.android.app.activity.InjectableAutoLocalizedAppCompatActivity
 import org.oppia.android.app.home.RouteToExplorationListener
@@ -41,6 +42,15 @@ class ResumeLessonActivity :
       params.parentScreen,
       params.checkpoint
     )
+    onBackPressedDispatcher.addCallback(
+      this,
+      object : OnBackPressedCallback(/* enabled = */ true) {
+        override fun handleOnBackPressed() {
+          resumeLessonActivityPresenter.setReadingTextSizeNormal()
+          finish()
+        }
+      }
+    )
   }
 
   // TODO(#1655): Re-restrict access to fields in tests post-Gradle.
@@ -113,9 +123,4 @@ class ResumeLessonActivity :
   override fun onDefaultFontSizeLoaded(readingTextSize: ReadingTextSize) {
     resumeLessonActivityPresenter.loadResumeLessonFragment(readingTextSize)
   }
-
-  override fun onBackPressed() {
-    resumeLessonActivityPresenter.setReadingTextSizeNormal()
-    finish()
-  }
 }
diff --git a/app/src/main/java/org/oppia/android/app/resumelesson/ResumeLessonActivityPresenter.kt b/app/src/main/java/org/oppia/android/app/resumelesson/ResumeLessonActivityPresenter.kt
index 210d49c887c..b09e77fdfce 100644
--- a/app/src/main/java/org/oppia/android/app/resumelesson/ResumeLessonActivityPresenter.kt
+++ b/app/src/main/java/org/oppia/android/app/resumelesson/ResumeLessonActivityPresenter.kt
@@ -73,8 +73,7 @@ class ResumeLessonActivityPresenter @Inject constructor(
         context = activity,
         ReadingTextSize.MEDIUM_TEXT_SIZE
       )
-      @Suppress("DEPRECATION") // TODO(#5404): Migrate to a back pressed dispatcher.
-      activity.onBackPressed()
+      activity.onBackPressedDispatcher.onBackPressed()
     }
   }