For 11271 - Provide useful tab counter message for accessibility

app/src/main/java/org/mozilla/fenix/components/toolbar/TabCounter.kt

@@ -34,11 +34,22 @@ open class TabCounter @JvmOverloads constructor(
             TypedValue.COMPLEX_UNIT_DIP, TWO_DIGIT_PADDING, context.resources.displayMetrics
         ).toInt()
         counter_text.setPadding(0, shiftThreeDp, shiftThreeDp, 0)
+        updateContentDescription(0)
 
         animationSet = createAnimatorSet()
     }
 
+    private fun updateContentDescription(count: Int) {
+        counter_root.contentDescription = if (count == 1) {
+            context?.getString(R.string.open_tab_tray_single)
+        } else {
+            context?.getString(R.string.open_tab_tray_plural, count.toString())
+        }
+    }
+
     fun setCountWithAnimation(count: Int) {
+        updateContentDescription(count)
+
         // Don't animate from initial state.
         if (this.count == 0) {
             setCount(count)
@@ -69,6 +80,7 @@ open class TabCounter @JvmOverloads constructor(
     }
 
     fun setCount(count: Int) {
+        updateContentDescription(count)
         adjustTextSize(count)
 
         counter_text.text = formatForDisplay(count)

app/src/main/java/org/mozilla/fenix/components/toolbar/TabCounterToolbarButton.kt

@@ -4,14 +4,12 @@
 
 package org.mozilla.fenix.components.toolbar
 
-import android.content.Context
 import android.util.TypedValue
 import android.view.View
 import android.view.ViewGroup
 import mozilla.components.browser.session.Session
 import mozilla.components.browser.session.SessionManager
 import mozilla.components.concept.toolbar.Toolbar
-import org.mozilla.fenix.R
 import org.mozilla.fenix.ext.sessionsOfType
 import java.lang.ref.WeakReference
 
@@ -34,12 +32,6 @@ class TabCounterToolbarButton(
                 showTabs.invoke()
             }
 
-            val count = sessionManager.sessions.count {
-                it.private == isPrivate
-            }
-
-            contentDescription = getDescriptionForTabCount(context, count)
-
             addOnAttachStateChangeListener(object : View.OnAttachStateChangeListener {
                 override fun onViewAttachedToWindow(v: View?) {
                     setCount(sessionManager.sessionsOfType(private = isPrivate).count())
@@ -66,18 +58,10 @@ class TabCounterToolbarButton(
         val count = sessionManager.sessionsOfType(private = isPrivate).count()
 
         reference.get()?.let {
-            it.contentDescription = getDescriptionForTabCount(it.context, count)
             it.setCountWithAnimation(count)
         }
     }
 
-    private fun getDescriptionForTabCount(context: Context?, count: Int): String? {
-        return if (count > 1) context?.getString(
-            R.string.tab_counter_content_description_multi_tab,
-            count
-        ) else context?.getString(R.string.tab_counter_content_description_one_tab)
-    }
-
     private val sessionManagerObserver = object : SessionManager.Observer {
         override fun onSessionAdded(session: Session) {
             updateCount()

app/src/main/res/values/strings.xml

@@ -21,6 +21,10 @@
     <string name="no_open_tabs_description">Your open tabs will be shown here.</string>
     <!-- No Private Tabs Message Description -->
     <string name="no_private_tabs_description">Your private tabs will be shown here.</string>
+    <!-- Message announced to the user when tab tray is selected with 1 tab -->
+    <string name="open_tab_tray_single">1 open tab. Tap to switch tabs.</string>
+    <!-- Message announced to the user when tab tray is selected with 0 or 2+ tabs -->
+    <string name="open_tab_tray_plural">%1$s open tabs. Tap to switch tabs.</string>
 
     <!-- About content. The first parameter is the name of the application. (For example: Fenix) -->
     <string name="about_content">%1$s is produced by Mozilla.</string>