竖着的SeekBar(VerticalSeekBar)

竖着的Seekbar：

 

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Rect;
import android.graphics.drawable.Drawable;
import android.util.AttributeSet;
import android.view.KeyEvent;
import android.view.MotionEvent;
import android.view.View;
import android.widget.AbsSeekBar;


public class VerticalSeekBar extends AbsSeekBar {
    private Drawable mThumb;
    private int height;
    private int width;
    public interface OnSeekBarChangeListener {
        void onProgressChanged(VerticalSeekBar VerticalSeekBar, int progress, boolean fromUser);
        void onStartTrackingTouch(VerticalSeekBar VerticalSeekBar);
        void onStopTrackingTouch(VerticalSeekBar VerticalSeekBar);
    }

    private OnSeekBarChangeListener mOnSeekBarChangeListener;
    
    public VerticalSeekBar(Context context) {
        this(context, null);
    }
    
    public VerticalSeekBar(Context context, AttributeSet attrs) {
        this(context, attrs, android.R.attr.seekBarStyle);
    }

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

	public void setOnSeekBarChangeListener(OnSeekBarChangeListener l) {
        mOnSeekBarChangeListener = l;
    }
    
    void onStartTrackingTouch() {
        if (mOnSeekBarChangeListener != null) {
            mOnSeekBarChangeListener.onStartTrackingTouch(this);
        }
    }
    
    void onStopTrackingTouch() {
        if (mOnSeekBarChangeListener != null) {
            mOnSeekBarChangeListener.onStopTrackingTouch(this);
        }
    }
    
    
    void onProgressRefresh(float scale, boolean fromUser) {
        Drawable thumb = mThumb;
        if (thumb != null) {
            setThumbPos(getHeight(), thumb, scale, Integer.MIN_VALUE);
            invalidate();
        }
        if (mOnSeekBarChangeListener != null) {
        	mOnSeekBarChangeListener.onProgressChanged(this, getProgress(), fromUser);
        }
    }

    private void setThumbPos(int w, Drawable thumb, float scale, int gap) {
        int available = w+getPaddingLeft()-getPaddingRight();
        int thumbWidth = thumb.getIntrinsicWidth();
        int thumbHeight = thumb.getIntrinsicHeight();
        available -= thumbWidth;
        // The extra space for the thumb to move on the track
        available += getThumbOffset() * 2;
        int thumbPos = (int) (scale * available);
        int topBound, bottomBound;
        if (gap == Integer.MIN_VALUE) {
            Rect oldBounds = thumb.getBounds();
            topBound = oldBounds.top;
            bottomBound = oldBounds.bottom;
        } else {
            topBound = gap;
            bottomBound = gap + thumbHeight;
        }
        thumb.setBounds(thumbPos, topBound, thumbPos + thumbWidth, bottomBound);
    }
    protected void onDraw(Canvas c)
    {
            c.rotate(-90);
            c.translate(-height,0);
            super.onDraw(c);
    }
    //可以改变进度条的高和宽
    protected synchronized void onMeasure(int widthMeasureSpec, int heightMeasureSpec)
    {
    	width = 28;
  		height = View.MeasureSpec.getSize(heightMeasureSpec);
		//width = View.MeasureSpec.getSize(widthMeasureSpec);
        this.setMeasuredDimension(width, height);
    }
	@Override
	public void setThumb(Drawable thumb)
	{
        mThumb = thumb;
		super.setThumb(thumb);
	}
    protected void onSizeChanged(int w, int h, int oldw, int oldh)
    {
            super.onSizeChanged(h, w, oldw, oldh);
    }   
    public boolean onTouchEvent(MotionEvent event) {
        if (!isEnabled()) {
            return false;
        }        
        switch (event.getAction()) {
            case MotionEvent.ACTION_DOWN:
                setPressed(true);
                onStartTrackingTouch();
                trackTouchEvent(event);
                break;
                
            case MotionEvent.ACTION_MOVE:
                trackTouchEvent(event);
                attemptClaimDrag();
                break;
                
            case MotionEvent.ACTION_UP:
                trackTouchEvent(event);
                onStopTrackingTouch();
                setPressed(false);
                break;
                
            case MotionEvent.ACTION_CANCEL:
                onStopTrackingTouch();
                setPressed(false);
                break;
        }
        return true;
    }
    private void trackTouchEvent(MotionEvent event) {
        final int Height = getHeight();
        final int available = Height - getPaddingBottom() - getPaddingTop();
        int Y = (int)event.getY();
        float scale;
        float progress = 0;
        if (Y > Height - getPaddingBottom()) {
            scale = 0.0f;
        } else if (Y  < getPaddingTop()) {
            scale = 1.0f;
        } else {
            scale = (float)(Height - getPaddingBottom()-Y) / (float)available;
        }
        
        final int max = getMax();
        progress = scale * max;
        
        setProgress((int) progress);
    }
    
    private void attemptClaimDrag() {
        if (getParent() != null) {
        	getParent().requestDisallowInterceptTouchEvent(true);
        }
    }
    public boolean dispatchKeyEvent(KeyEvent event) {
    	if(event.getAction()==KeyEvent.ACTION_DOWN)
    	{
    		KeyEvent newEvent = null;
    		switch(event.getKeyCode())
    		{
    			case KeyEvent.KEYCODE_DPAD_UP:
    				newEvent = new KeyEvent(KeyEvent.ACTION_DOWN,KeyEvent.KEYCODE_DPAD_RIGHT);
    				break;
    			case KeyEvent.KEYCODE_DPAD_DOWN:
    				newEvent = new KeyEvent(KeyEvent.ACTION_DOWN,KeyEvent.KEYCODE_DPAD_LEFT);
    				break;
    			case KeyEvent.KEYCODE_DPAD_LEFT:
    				newEvent = new KeyEvent(KeyEvent.ACTION_DOWN,KeyEvent.KEYCODE_DPAD_DOWN);
    				break;
    			case KeyEvent.KEYCODE_DPAD_RIGHT:
    				newEvent = new KeyEvent(KeyEvent.ACTION_DOWN,KeyEvent.KEYCODE_DPAD_UP);
    				break;
    			default:
    				newEvent = new KeyEvent(KeyEvent.ACTION_DOWN,event.getKeyCode());
					break;
    		}
    		return newEvent.dispatch(this);
    	}
    	return false;
    }
}