Ignore key events when the widget is disabled.

import android.view.MotionEvent;

public abstract class AbsSeekBar extends ProgressBar {

    private Drawable mThumb;

    private int mThumbOffset;

        Drawable thumb = a.getDrawable(com.android.internal.R.styleable.SeekBar_thumb);

        setThumb(thumb); // will guess mThumbOffset if thumb != null...

        // ...but allow layout to override this

        int thumbOffset =

                a.getDimensionPixelOffset(com.android.internal.R.styleable.SeekBar_thumbOffset, getThumbOffset());

        int thumbOffset = a.getDimensionPixelOffset(

                com.android.internal.R.styleable.SeekBar_thumbOffset, getThumbOffset());

        setThumbOffset(thumbOffset);

        a.recycle();

        a = context.obtainStyledAttributes(attrs,

            // Assuming the thumb drawable is symmetric, set the thumb offset

            // such that the thumb will hang halfway off either edge of the

            // progress bar.

            mThumbOffset = (int)thumb.getIntrinsicWidth() / 2;

            mThumbOffset = thumb.getIntrinsicWidth() / 2;

        }

        mThumb = thumb;

        invalidate();

    @Override

    public boolean onKeyDown(int keyCode, KeyEvent event) {

        if (isEnabled()) {

            int progress = getProgress();

            switch (keyCode) {

                case KeyEvent.KEYCODE_DPAD_LEFT:

                    if (progress <= 0) break;

                    onKeyChange();

                    return true;

            }

        }

        return super.onKeyDown(keyCode, event);

    }