Stop the ringtone when other seek bar is adjust

- Stop the ringtone when other seek bar is adjust.
- Add test to verify when onStartTrackingTouch() is called,
  will call stopSample().

Bug: 80194851
Test: make -j42 RunSettingsRoboTests
Change-Id: I2300f0f56340c3698f62cc911bda7b7a94d23a7a

src/com/android/settings/notification/SoundSettings.java

@@ -204,10 +204,6 @@ public class SoundSettings extends DashboardFragment implements OnActivityResult
 
         @Override
         public void onSampleStarting(SeekBarVolumizer sbv) {
-            if (mCurrent != null && mCurrent != sbv) {
-                mCurrent.stopSample();
-            }
-            mCurrent = sbv;
             if (mCurrent != null) {
                 mHandler.removeMessages(STOP_SAMPLE);
                 mHandler.sendEmptyMessageDelayed(STOP_SAMPLE, SAMPLE_CUTOFF);
@@ -222,6 +218,15 @@ public class SoundSettings extends DashboardFragment implements OnActivityResult
             }
         }
 
+        @Override
+        public void onStartTrackingTouch(SeekBarVolumizer sbv) {
+            // stop the ringtone when other seek bar is adjust
+            if (mCurrent != null && mCurrent != sbv) {
+                mCurrent.stopSample();
+            }
+            mCurrent = sbv;
+        }
+
         public void stopSample() {
             if (mCurrent != null) {
                 mCurrent.stopSample();