Android – Seek Bar thumb not transparent in Android 5.0 API 21 Lollipop

androidandroid-5.0-lollipoptransparency

API Level < 21

Thumb is transparent, as expected.

Screenshot taken on a Nexus 5 running Android 4.4.4

On API Level 21

Thumb is opaque, Wonder why.

Screenshot taken on a Nexus 5 running Android 5.0

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 eclipse itself, when you change the API Level perspectives.

When API level 21 is selected

When API level 19 is selected

Note:

  • I run the same apk on both devices.
  • Both devices are of the same make and model, i.e Nexus 5.
  • The thumb image is a PNG with a transparent background, as apparent from the screenshot for API Level < 21

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

Best Answer

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