[fenix] For https://github.com/mozilla-mobile/fenix/issues/16420: Make search bar first view focused by a11y services on open.

app/src/main/java/org/mozilla/fenix/search/SearchDialogFragment.kt

@@ -11,6 +11,7 @@ import android.content.Context
 import android.content.DialogInterface
 import android.content.Intent
 import android.graphics.Typeface
+import android.os.Build
 import android.os.Bundle
 import android.os.StrictMode
 import android.speech.RecognizerIntent
@@ -20,6 +21,7 @@ import android.view.View
 import android.view.ViewGroup
 import android.view.ViewStub
 import android.view.WindowManager
+import android.view.accessibility.AccessibilityEvent
 import androidx.appcompat.app.AlertDialog
 import androidx.appcompat.app.AppCompatDialogFragment
 import androidx.appcompat.content.res.AppCompatResources
@@ -28,12 +30,14 @@ import androidx.constraintlayout.widget.ConstraintProperties.PARENT_ID
 import androidx.constraintlayout.widget.ConstraintProperties.TOP
 import androidx.constraintlayout.widget.ConstraintSet
 import androidx.core.view.isVisible
+import androidx.lifecycle.lifecycleScope
 import androidx.navigation.fragment.findNavController
 import androidx.navigation.fragment.navArgs
 import kotlinx.android.synthetic.main.fragment_search_dialog.*
 import kotlinx.android.synthetic.main.fragment_search_dialog.view.*
 import kotlinx.android.synthetic.main.search_suggestions_hint.view.*
 import kotlinx.coroutines.ExperimentalCoroutinesApi
+import kotlinx.coroutines.launch
 import mozilla.components.browser.toolbar.BrowserToolbar
 import mozilla.components.concept.storage.HistoryStorage
 import mozilla.components.feature.qr.QrFeature
@@ -276,6 +280,9 @@ class SearchDialogFragment : AppCompatDialogFragment(), UserInteractionHandler {
         }
 
         view.search_suggestions_hint.setOnInflateListener((stubListener))
+        if (view.context.settings().accessibilityServicesEnabled) {
+            updateAccessibilityTraversalOrder()
+        }
 
         consumeFrom(store) {
             val shouldShowAwesomebar =
@@ -294,6 +301,19 @@ class SearchDialogFragment : AppCompatDialogFragment(), UserInteractionHandler {
         }
     }
 
+    private fun updateAccessibilityTraversalOrder() {
+        val searchWrapperId = search_wrapper.id
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP_MR1) {
+            qr_scan_button.accessibilityTraversalAfter = searchWrapperId
+            search_engines_shortcut_button.accessibilityTraversalAfter = searchWrapperId
+            fill_link_from_clipboard.accessibilityTraversalAfter = searchWrapperId
+        } else {
+            viewLifecycleOwner.lifecycleScope.launch {
+                search_wrapper.sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_FOCUSED)
+            }
+        }
+    }
+
     override fun onResume() {
         super.onResume()
         resetFocus()