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For API 11 and later, can use seekbar’s XML attributes(android:rotation=”270″) for vertical effect.
<SeekBar android:id="@+id/seekBar1" android:layout_width="match_parent" android:layout_height="wrap_content" android:rotation="270"/>
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For older API level (ex API10), only use Selva’s answer:
https://github.com/AndroSelva/Vertical-SeekBar-Android