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A circular seekbar for Android, with a control knob! (for the lack of a better word).

Croller Change Listener (if want start and stop tracking as well, similar to seekbar)

Croller croller.setOnCrollerChangeListener(new OnCrollerChangeListener() { @Override public void onProgressChanged(Croller croller, int progress) { // use the progress

}

@Override public void onStartTrackingTouch(Croller croller) { // tracking started

}

@Override public void onStopTrackingTouch(Croller croller) { // tracking stopped

} });