Add seekBar properties 'tickMark' to LabeledSeekBarPreference

Bug: 173940869
Test: manual
Change-Id: I135e52181bdb86ded6187a3fa30b9cffeb69d451

res/values/attrs.xml

@@ -170,6 +170,7 @@
     <declare-styleable name="LabeledSeekBarPreference">
         <attr name="textStart" format="reference" />
         <attr name="textEnd" format="reference" />
+        <attr name="tickMark" format="reference" />
     </declare-styleable>
 
     <declare-styleable name="TintDrawable">

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

@@ -18,6 +18,7 @@ package com.android.settings.widget;
 
 import android.content.Context;
 import android.content.res.TypedArray;
+import android.graphics.drawable.Drawable;
 import android.util.AttributeSet;
 import android.widget.SeekBar;
 import android.widget.TextView;
@@ -32,6 +33,7 @@ public class LabeledSeekBarPreference extends SeekBarPreference {
 
     private final int mTextStartId;
     private final int mTextEndId;
+    private final int mTickMarkId;
     private OnPreferenceChangeListener mStopListener;
 
     public LabeledSeekBarPreference(Context context, AttributeSet attrs, int defStyleAttr,
@@ -48,6 +50,8 @@ public class LabeledSeekBarPreference extends SeekBarPreference {
         mTextEndId = styledAttrs.getResourceId(
                 R.styleable.LabeledSeekBarPreference_textEnd,
                 R.string.summary_placeholder);
+        mTickMarkId = styledAttrs.getResourceId(
+                R.styleable.LabeledSeekBarPreference_tickMark, /* defValue= */ 0);
         styledAttrs.recycle();
     }
 
@@ -65,6 +69,13 @@ public class LabeledSeekBarPreference extends SeekBarPreference {
         final TextView endText = (TextView) holder.findViewById(android.R.id.text2);
         startText.setText(mTextStartId);
         endText.setText(mTextEndId);
+
+        if (mTickMarkId != 0) {
+            final Drawable tickMark = getContext().getDrawable(mTickMarkId);
+            final SeekBar seekBar = (SeekBar) holder.findViewById(
+                    com.android.internal.R.id.seekbar);
+            seekBar.setTickMark(tickMark);
+        }
     }
 
     public void setOnPreferenceChangeStopListener(OnPreferenceChangeListener listener) {