VerticalSeekBar.java

package android.widget;

import android.annotation.SuppressLint;
import android.content.Context;

import android.graphics.Canvas;

import android.util.AttributeSet;

import android.view.MotionEvent;

import android.widget.SeekBar;

public class VerticalSeekBar extends SeekBar {

protected OnSeekBarChangeListener changeListener;

public VerticalSeekBar(Context context) {

    super(context);

}

public VerticalSeekBar(Context context, AttributeSet attrs, int defStyle) {

    super(context, attrs, defStyle);

}

public VerticalSeekBar(Context context, AttributeSet attrs) {

    super(context, attrs);

}

protected void onSizeChanged(int w, int h, int oldw, int oldh) {

    super.onSizeChanged(h, w, oldh, oldw);

}

@Override
protected synchronized void onMeasure(int widthMeasureSpec,
        int heightMeasureSpec) {

    super.onMeasure(heightMeasureSpec, widthMeasureSpec);

    setMeasuredDimension(getMeasuredHeight(), getMeasuredWidth());

}

protected void onDraw(Canvas c) {

    c.rotate(-90);

    c.translate(-getHeight(), 0);

    super.onDraw(c);

}

@Override
public boolean onTouchEvent(MotionEvent event) {


    if (!isEnabled()) {

        return false;

    }

    switch (event.getAction()) {
    case MotionEvent.ACTION_DOWN:

        setSelected(true);
        setPressed(true);
        if (changeListener != null)
            changeListener.onStartTrackingTouch(this);
        break;

    case MotionEvent.ACTION_UP:

        setSelected(false);
        setPressed(false);
        if (changeListener != null)
            changeListener.onStopTrackingTouch(this);
        break;

    case MotionEvent.ACTION_MOVE:

        int progress = getMax()
                - (int) (getMax() * event.getY() / getHeight());
        setProgress(progress);
        onSizeChanged(getWidth(), getHeight(), 0, 0);
        if (changeListener != null)
            changeListener.onProgressChanged(this, progress, true);
        break;

    case MotionEvent.ACTION_CANCEL:
        break;
    }

    return true;

}
    
    @Override public synchronized void setProgress(int progress){ super.setProgress(progress); onSizeChanged(getWidth(), getHeight(), 0, 0); }
    
    @Override public void setOnSeekBarChangeListener(OnSeekBarChangeListener mListener) { this.changeListener = mListener; }
}