Search bar malfunction in Android 5.0 API 21 Lollipop browser

Question

API level <21

Thumb is transparent as expected.

In API Level 21

Thumb is opaque, I wonder why.

Here is the code

<SeekBar android:id="@+id/ui_audioplayer_progressbar" android:layout_width="match_parent" android:layout_height="wrap_content" android:progressDrawable="@drawable/custom_progress_bar_horizontal" android:thumb="@drawable/stud_slider" /> 

Interestingly, this problem can be seen and reproduced in the xml preview in the eclipse itself when you change the perspectives of the API level.

Note:

• I run the same apk on both devices.
• Both devices have the same make and model, i.e. Nexus 5.
• The thumb image is PNG with a transparent background, as can be seen from the screenshot for API level <21

Is this a known bug in Lollipop or am I doing something wrong?

Answer 1

 <SeekBar .... android:splitTrack="false" /> 

Answer 2

For all API levels

 <Seekbar ..... android:background="@null" android:splitTrack="false" .... /> 

will work. It worked for me.