Add a new method to set state description

- This CL add a new method setSeekBarStateDescription() to set
  the state of seek bar. Because in some case the description of
  seek bar is not align progress of seek bar.
- Add test case

Bug: 157629483
Test: make -j42 RunSettingsRoboTests
Change-Id: I432e6f9deef59756b0a41244d50aaada1ddac6a9

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

@@ -51,6 +51,7 @@ public class SeekBarPreference extends RestrictedPreference
     private boolean mShouldBlink;
     private int mAccessibilityRangeInfoType = AccessibilityNodeInfo.RangeInfo.RANGE_TYPE_INT;
     private CharSequence mSeekBarContentDescription;
+    private CharSequence mSeekBarStateDescription;
 
     public SeekBarPreference(
             Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
@@ -124,6 +125,9 @@ public class SeekBarPreference extends RestrictedPreference
         } else if (!TextUtils.isEmpty(title)) {
             mSeekBar.setContentDescription(title);
         }
+        if (!TextUtils.isEmpty(mSeekBarStateDescription)) {
+            mSeekBar.setStateDescription(mSeekBarStateDescription);
+        }
         if (mSeekBar instanceof DefaultIndicatorSeekBar) {
             ((DefaultIndicatorSeekBar) mSeekBar).setDefaultProgress(mDefaultProgress);
         }
@@ -304,6 +308,18 @@ public class SeekBarPreference extends RestrictedPreference
         }
     }
 
+    /**
+     * Specify the state description for this seek bar represents.
+     *
+     * @param stateDescription the state description of seek bar
+     */
+    public void setSeekBarStateDescription(CharSequence stateDescription) {
+        mSeekBarStateDescription = stateDescription;
+        if (mSeekBar != null) {
+            mSeekBar.setStateDescription(stateDescription);
+        }
+    }
+
     @Override
     protected Parcelable onSaveInstanceState() {
         /*