Fix focus at ttt chip

Fix talkback focus to be at tap-to-transfer chip.
The talkback says the name of the app running and the event.

Bug: 229557832
Test: atest MediaTttChipControllerSenderTest
Change-Id: If862b0eb9b50533ff184a23b609808611d2be5bd

packages/SystemUI/src/com/android/systemui/media/taptotransfer/common/MediaTttChipControllerCommon.kt

@@ -56,7 +56,7 @@ abstract class MediaTttChipControllerCommon<T : ChipInfoCommon>(
         internal val logger: MediaTttLogger,
         internal val windowManager: WindowManager,
         private val viewUtil: ViewUtil,
-        @Main private val mainExecutor: DelayableExecutor,
+        @Main internal val mainExecutor: DelayableExecutor,
         private val accessibilityManager: AccessibilityManager,
         private val configurationController: ConfigurationController,
         private val powerManager: PowerManager,
@@ -205,13 +205,15 @@ abstract class MediaTttChipControllerCommon<T : ChipInfoCommon>(
      *
      * @param appPackageName the package name of the app playing the media. Will be used to fetch
      *   the app icon and app name if overrides aren't provided.
+     *
+     * @return the content description of the icon.
      */
     internal fun setIcon(
         currentChipView: ViewGroup,
         appPackageName: String?,
         appIconDrawableOverride: Drawable? = null,
         appNameOverride: CharSequence? = null,
-    ) {
+    ): CharSequence {
         val appIconView = currentChipView.requireViewById<CachingIconView>(R.id.app_icon)
         val iconInfo = getIconInfo(appPackageName)
 
@@ -224,6 +226,7 @@ abstract class MediaTttChipControllerCommon<T : ChipInfoCommon>(
 
         appIconView.contentDescription = appNameOverride ?: iconInfo.iconName
         appIconView.setImageDrawable(appIconDrawableOverride ?: iconInfo.icon)
+        return appIconView.contentDescription.toString()
     }
 
     /**

packages/SystemUI/src/com/android/systemui/media/taptotransfer/sender/MediaTttChipControllerSender.kt

@@ -122,13 +122,12 @@ class MediaTttChipControllerSender @Inject constructor(
         val chipState = newChipInfo.state
 
         // App icon
-        setIcon(currentChipView, newChipInfo.routeInfo.packageName)
+        val iconName = setIcon(currentChipView, newChipInfo.routeInfo.packageName)
 
         // Text
         val otherDeviceName = newChipInfo.routeInfo.name.toString()
-        currentChipView.requireViewById<TextView>(R.id.text).apply {
-            text = chipState.getChipTextString(context, otherDeviceName)
-        }
+        val chipText = chipState.getChipTextString(context, otherDeviceName)
+        currentChipView.requireViewById<TextView>(R.id.text).text = chipText
 
         // Loading
         currentChipView.requireViewById<View>(R.id.loading).visibility =
@@ -145,17 +144,29 @@ class MediaTttChipControllerSender @Inject constructor(
         // Failure
         currentChipView.requireViewById<View>(R.id.failure_icon).visibility =
             chipState.isTransferFailure.visibleIfTrue()
+
+        // For accessibility
+        currentChipView.requireViewById<ViewGroup>(
+                R.id.media_ttt_sender_chip_inner
+        ).contentDescription = "$iconName $chipText"
     }
 
     override fun animateChipIn(chipView: ViewGroup) {
+        val chipInnerView = chipView.requireViewById<ViewGroup>(R.id.media_ttt_sender_chip_inner)
         ViewHierarchyAnimator.animateAddition(
-            chipView.requireViewById<ViewGroup>(R.id.media_ttt_sender_chip_inner),
+            chipInnerView,
             ViewHierarchyAnimator.Hotspot.TOP,
             Interpolators.EMPHASIZED_DECELERATE,
-            duration = 500L,
+            duration = ANIMATION_DURATION,
             includeMargins = true,
             includeFadeIn = true,
         )
+
+        // We can only request focus once the animation finishes.
+        mainExecutor.executeDelayed(
+                { chipInnerView.requestAccessibilityFocus() },
+                ANIMATION_DURATION
+        )
     }
 
     override fun removeChip(removalReason: String) {
@@ -186,3 +197,4 @@ data class ChipSenderInfo(
 }
 
 const val SENDER_TAG = "MediaTapToTransferSender"
+private const val ANIMATION_DURATION = 500L