Export callback to receive seekbar change event from SeekBarPrefernce

- Export onSeekBarChangeListener callback to receive change event from parent
  - Update battery saver schedule trigger threshold after seekbar tounch
    ending instead of update it every time during dragging or touching

Bug: 236356020
Test: make RunSettingsRoboTests
Change-Id: Ifee7cd9e7cabfbec0817a4c28254228f885d6a8d

src/com/android/settings/widget/SeekBarPreference.java

@@ -64,6 +64,7 @@ public class SeekBarPreference extends RestrictedPreference
     private CharSequence mOverrideSeekBarStateDescription;
     private CharSequence mSeekBarContentDescription;
     private CharSequence mSeekBarStateDescription;
+    private OnSeekBarChangeListener mOnSeekBarChangeListener;
 
     public SeekBarPreference(
             Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
@@ -101,6 +102,14 @@ public class SeekBarPreference extends RestrictedPreference
         this(context, null);
     }
 
+    /**
+     * A callback that notifies clients when the seekbar progress level has been
+     * changed. See {@link OnSeekBarChangeListener} for more info.
+     */
+    public void setOnSeekBarChangeListener(OnSeekBarChangeListener listener) {
+        mOnSeekBarChangeListener = listener;
+    }
+
     public void setShouldBlink(boolean shouldBlink) {
         mShouldBlink = shouldBlink;
         notifyChanged();
@@ -301,6 +310,9 @@ public class SeekBarPreference extends RestrictedPreference
         if (fromUser && (mContinuousUpdates || !mTrackingTouch)) {
             syncProgress(seekBar);
         }
+        if (mOnSeekBarChangeListener != null) {
+            mOnSeekBarChangeListener.onProgressChanged(seekBar, progress, fromUser);
+        }
     }
 
     @Override
@@ -309,6 +321,9 @@ public class SeekBarPreference extends RestrictedPreference
         mJankMonitor.begin(InteractionJankMonitor.Configuration.Builder
                 .withView(CUJ_SETTINGS_SLIDER, seekBar)
                 .setTag(getKey()));
+        if (mOnSeekBarChangeListener != null) {
+            mOnSeekBarChangeListener.onStartTrackingTouch(seekBar);
+        }
     }
 
     @Override
@@ -317,6 +332,9 @@ public class SeekBarPreference extends RestrictedPreference
         if (seekBar.getProgress() != mProgress) {
             syncProgress(seekBar);
         }
+        if (mOnSeekBarChangeListener != null) {
+            mOnSeekBarChangeListener.onStopTrackingTouch(seekBar);
+        }
         mJankMonitor.end(CUJ_SETTINGS_SLIDER);
     }