Perform haptic feedback when the seekbar snaps.

- add haptic feedback mode to perform haptic feedback as the seekbar's progress value is updated.
- add haptic feedback mode to perform haptic feedback as the seekbar's progress value is equal to the min/max value

Bug: 172900709
Test: make -j42 RunSettingsRoboTests ROBOTEST_FILTER=SeekBarPreferenceTest
Change-Id: I9378313d366f09bb8e7069d9240fde24af318c53

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

@@ -16,6 +16,8 @@
 
 package com.android.settings.widget;
 
+import static android.view.HapticFeedbackConstants.CLOCK_TICK;
+
 import android.content.Context;
 import android.content.res.TypedArray;
 import android.os.Parcel;
@@ -39,12 +41,17 @@ import com.android.settingslib.RestrictedPreference;
 public class SeekBarPreference extends RestrictedPreference
         implements OnSeekBarChangeListener, View.OnKeyListener {
 
+    public static final int HAPTIC_FEEDBACK_MODE_NONE = 0;
+    public static final int HAPTIC_FEEDBACK_MODE_ON_TICKS = 1;
+    public static final int HAPTIC_FEEDBACK_MODE_ON_ENDS = 2;
+
     private int mProgress;
     private int mMax;
     private int mMin;
     private boolean mTrackingTouch;
 
     private boolean mContinuousUpdates;
+    private int mHapticFeedbackMode = HAPTIC_FEEDBACK_MODE_NONE;
     private int mDefaultProgress = -1;
 
     private SeekBar mSeekBar;
@@ -235,6 +242,17 @@ public class SeekBarPreference extends RestrictedPreference
         mContinuousUpdates = continuousUpdates;
     }
 
+    /**
+     * Sets the haptic feedback mode. HAPTIC_FEEDBACK_MODE_ON_TICKS means to perform haptic feedback
+     * as the SeekBar's progress is updated; HAPTIC_FEEDBACK_MODE_ON_ENDS means to perform haptic
+     * feedback as the SeekBar's progress value is equal to the min/max value.
+     *
+     * @param hapticFeedbackMode the haptic feedback mode.
+     */
+    public void setHapticFeedbackMode(int hapticFeedbackMode) {
+        mHapticFeedbackMode = hapticFeedbackMode;
+    }
+
     private void setProgress(int progress, boolean notifyChanged) {
         if (progress > mMax) {
             progress = mMax;
@@ -264,6 +282,16 @@ public class SeekBarPreference extends RestrictedPreference
         if (progress != mProgress) {
             if (callChangeListener(progress)) {
                 setProgress(progress, false);
+                switch (mHapticFeedbackMode) {
+                    case HAPTIC_FEEDBACK_MODE_ON_TICKS:
+                        seekBar.performHapticFeedback(CLOCK_TICK);
+                        break;
+                    case HAPTIC_FEEDBACK_MODE_ON_ENDS:
+                        if (progress == mMax || progress == mMin) {
+                            seekBar.performHapticFeedback(CLOCK_TICK);
+                        }
+                        break;
+                }
             } else {
                 seekBar.setProgress(mProgress);
             }