[TimePicker] Accessibility focus on error

Move the accessibility focus back to the error when clicking "OK".

PiperOrigin-RevId: 810864879

Author: paulfthomas

lib/java/com/google/android/material/timepicker/ChipTextInputComboView.java

@@ -33,6 +33,7 @@
 import android.util.AttributeSet;
 import android.view.LayoutInflater;
 import android.view.View;
+import android.view.accessibility.AccessibilityEvent;
 import android.widget.Checkable;
 import android.widget.EditText;
 import android.widget.FrameLayout;
@@ -154,6 +155,14 @@ CharSequence getChipText() {
     return chipText;
   }
 
+  void requestAccessibilityFocus() {
+    if (editText.getVisibility() == View.VISIBLE) {
+      editText.sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_FOCUSED);
+    } else {
+      chip.sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_FOCUSED);
+    }
+  }
+
   private String formatText(CharSequence text) {
     return TimeModel.formatText(getResources(), text);
   }

lib/java/com/google/android/material/timepicker/MaterialTimePicker.java

@@ -293,6 +293,7 @@ public final View onCreateView(
             TimePickerTextInputPresenter presenter = (TimePickerTextInputPresenter) activePresenter;
             if (presenter.hasError()) {
               presenter.vibrateAndMaybeBeep(root.getContext());
+              presenter.accessibilityFocusOnError();
               return;
             }
           }

lib/java/com/google/android/material/timepicker/TimePickerTextInputPresenter.java

@@ -280,6 +280,20 @@ void vibrateAndMaybeBeep(@NonNull Context context) {
     }
   }
 
+  void accessibilityFocusOnError() {
+    if (hourTextInput.hasError()) {
+      requestAccessibilityFocusAndAnnounce(hourTextInput, hourLabel);
+    } else if (minuteTextInput.hasError()) {
+      requestAccessibilityFocusAndAnnounce(minuteTextInput, minuteLabel);
+    }
+  }
+
+  private void requestAccessibilityFocusAndAnnounce(
+      @NonNull ChipTextInputComboView viewToFocus, @NonNull TextView labelToAnnounce) {
+    viewToFocus.requestAccessibilityFocus();
+    labelToAnnounce.announceForAccessibility(labelToAnnounce.getText());
+  }
+
   @SuppressLint("MissingPermission")
   private void vibrate(@NonNull Context context) {
     if (Build.VERSION.SDK_INT < Build.VERSION_CODES.M