[MaterialTimePicker][a11y] Give more context on hour/minute selection

PiperOrigin-RevId: 435119125

Author: paulfthomas

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

@@ -30,6 +30,7 @@
 import android.os.Build.VERSION_CODES;
 import android.view.View;
 import android.view.accessibility.AccessibilityManager;
+import androidx.core.view.accessibility.AccessibilityNodeInfoCompat;
 import com.google.android.material.timepicker.ClockHandView.OnActionUpListener;
 import com.google.android.material.timepicker.ClockHandView.OnRotateListener;
 import com.google.android.material.timepicker.TimePickerControls.ActiveSelection;
@@ -56,8 +57,8 @@ class TimePickerClockPresenter
   private static final int DEGREES_PER_HOUR = 30;
   private static final int DEGREES_PER_MINUTE = 6;
 
-  private TimePickerView timePickerView;
-  private TimeModel time;
+  private final TimePickerView timePickerView;
+  private final TimeModel time;
   private float minuteRotation;
   private float hourRotation;
 
@@ -164,9 +165,28 @@ void setSelection(@ActiveSelection int selection, boolean animate) {
     timePickerView.setHandRotation(isMinute ? minuteRotation : hourRotation, animate);
     timePickerView.setActiveSelection(selection);
     timePickerView.setMinuteHourDelegate(
-        new ClickActionDelegate(timePickerView.getContext(), R.string.material_hour_selection));
+        new ClickActionDelegate(timePickerView.getContext(), R.string.material_hour_selection) {
+          @Override
+          public void onInitializeAccessibilityNodeInfo(
+              View host, AccessibilityNodeInfoCompat info) {
+            super.onInitializeAccessibilityNodeInfo(host, info);
+            info.setContentDescription(
+                host.getResources()
+                    .getString(
+                        R.string.material_hour_suffix, String.valueOf(time.getHourForDisplay())));
+          }
+        });
     timePickerView.setHourClickDelegate(
-        new ClickActionDelegate(timePickerView.getContext(), R.string.material_minute_selection));
+        new ClickActionDelegate(timePickerView.getContext(), R.string.material_minute_selection) {
+          @Override
+          public void onInitializeAccessibilityNodeInfo(
+              View host, AccessibilityNodeInfoCompat info) {
+            super.onInitializeAccessibilityNodeInfo(host, info);
+            info.setContentDescription(
+                host.getResources()
+                    .getString(R.string.material_minute_suffix, String.valueOf(time.minute)));
+          }
+        });
   }
 
   @Override
@@ -182,7 +202,7 @@ public void onActionUp(float rotation, boolean moveInEventStream) {
 
       AccessibilityManager am =
           getSystemService(timePickerView.getContext(), AccessibilityManager.class);
-      boolean isExploreByTouchEnabled = am.isTouchExplorationEnabled();
+      boolean isExploreByTouchEnabled = am != null && am.isTouchExplorationEnabled();
       if (!isExploreByTouchEnabled) {
         setSelection(MINUTE, /* animate= */ true);
       }

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

@@ -43,6 +43,7 @@
 import android.widget.LinearLayout;
 import android.widget.TextView;
 import androidx.annotation.ColorInt;
+import androidx.core.view.accessibility.AccessibilityNodeInfoCompat;
 import com.google.android.material.button.MaterialButtonToggleGroup;
 import com.google.android.material.button.MaterialButtonToggleGroup.OnButtonCheckedListener;
 import com.google.android.material.color.MaterialColors;
@@ -95,7 +96,7 @@ public void afterTextChanged(Editable s) {
   private final EditText minuteEditText;
   private MaterialButtonToggleGroup toggle;
 
-  public TimePickerTextInputPresenter(LinearLayout timePickerView, TimeModel time) {
+  public TimePickerTextInputPresenter(final LinearLayout timePickerView, final TimeModel time) {
     this.timePickerView = timePickerView;
     this.time = time;
     Resources res = timePickerView.getResources();
@@ -137,9 +138,28 @@ public void onClick(View v) {
 
     controller = new TimePickerTextInputKeyController(hourTextInput, minuteTextInput, time);
     hourTextInput.setChipDelegate(
-        new ClickActionDelegate(timePickerView.getContext(), R.string.material_hour_selection));
+        new ClickActionDelegate(timePickerView.getContext(), R.string.material_hour_selection) {
+          @Override
+          public void onInitializeAccessibilityNodeInfo(
+              View host, AccessibilityNodeInfoCompat info) {
+            super.onInitializeAccessibilityNodeInfo(host, info);
+            info.setContentDescription(
+                host.getResources()
+                    .getString(
+                        R.string.material_hour_suffix, String.valueOf(time.getHourForDisplay())));
+          }
+        });
     minuteTextInput.setChipDelegate(
-        new ClickActionDelegate(timePickerView.getContext(), R.string.material_minute_selection));
+        new ClickActionDelegate(timePickerView.getContext(), R.string.material_minute_selection) {
+          @Override
+          public void onInitializeAccessibilityNodeInfo(
+              View host, AccessibilityNodeInfoCompat info) {
+            super.onInitializeAccessibilityNodeInfo(host, info);
+            info.setContentDescription(
+                host.getResources()
+                    .getString(R.string.material_minute_suffix, String.valueOf(time.minute)));
+          }
+        });
 
     initialize();
   }