android 垂直 SeekBar 源代码(VerticalSeekBar)

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这几天需要用到垂直的 seekbar 但是android 包下翻了一下。发现没有，只能自己修改源码。

主要是继承 AbsSeekBar 然后修改下面这些方法

onProgressRefresh（） //当进度条数据更新的时候，例如我们拖动滑动条的时候，这个方法被调用

setThumbPos（） //这个方法是设置Thumb的位置

onDraw（） //这个是负责画界面

onSizeChanged（） //更新画布尺寸

onTouchEvent（） //当触摸屏幕的时候被调用

trackTouchEvent（） //当拖动滑动条的时候，这个被调用

还有就是添加一个接口这个接口是SeekBar 的一个内部接口 public interface OnSeekBarChangeListener

里面有三个方法:

public void onProgressChanged(VerticalSeekBar vBar, int progress,boolean fromUser);
public void onStartTrackingTouch(VerticalSeekBar vBar);
public void onStopTrackingTouch(VerticalSeekBar vBar);

这个接口主要是为外部提供监听。多说无益,大家看源代码明白一点。

import java.lang.reflect.Field;import java.lang.reflect.Method;import android.content.Context;import android.graphics.Canvas;import android.graphics.Rect;import android.graphics.drawable.Drawable;import android.util.AttributeSet;import android.util.Log;import android.view.MotionEvent;import android.view.View;import android.widget.AbsSeekBar;import android.widget.SeekBar;public class VerticalSeekBar extends AbsSeekBar { private int height = -1;private int width = -1;public interface OnSeekBarChangeListener{public void onProgressChanged(VerticalSeekBar vBar, int progress,boolean fromUser);public void onStartTrackingTouch(VerticalSeekBar vBar);public void onStopTrackingTouch(VerticalSeekBar vBar);}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 = null;try{Field mThumb_f = this.getClass().getSuperclass().getDeclaredField("mThumb");mThumb_f.setAccessible(true);thumb = (Drawable)mThumb_f.get(this);}catch (Exception e){e.printStackTrace();}setThumbPos(getWidth(), 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 = 0;try{int up = getPaddingTop();int bottom = getPaddingBottom();available = getHeight() - up - bottom;        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;        }        // Canvas will be translated, so 0,0 is where we start drawing        thumb.setBounds(thumbPos, topBound, thumbPos + thumbWidth, bottomBound);}catch (Exception e){e.printStackTrace();}} protected synchronized void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {      width = 30;         height = View.MeasureSpec.getSize(heightMeasureSpec);          this.setMeasuredDimension(width, height);  } protected void onDraw(Canvas c){c.rotate(-90);c.translate(-height,0); super.onDraw(c);}protected void onSizeChanged(int w, int h, int oldw, int oldh){             super.onSizeChanged(h, w, oldw, oldh); }     @Override    public boolean onTouchEvent(MotionEvent event)    {        boolean mIsUserSeekable=true;try{    Field mIsUserSeekable_f = this.getClass().getSuperclass().getDeclaredField("mIsUserSeekable");    mIsUserSeekable_f.setAccessible(true);mIsUserSeekable = mIsUserSeekable_f.getBoolean(this);}catch (Exception e1){e1.printStackTrace();}            if (!mIsUserSeekable || !isEnabled()) {            return false;        }                switch (event.getAction()) {            case MotionEvent.ACTION_DOWN:                setPressed(true);                onStartTrackingTouch();                trackTouchEvent(event);                break;                            case MotionEvent.ACTION_MOVE:                trackTouchEvent(event);                Method attemptClaimDrag;try{attemptClaimDrag = this.getClass().getSuperclass().getDeclaredMethod("attemptClaimDrag");attemptClaimDrag.setAccessible(true);                attemptClaimDrag.invoke(this);}catch (Exception e){e.printStackTrace();}                break;                            case MotionEvent.ACTION_UP:                trackTouchEvent(event);                onStopTrackingTouch();                setPressed(false);                // ProgressBar doesn't know to repaint the thumb drawable                // in its inactive state when the touch stops (because the                // value has not apparently changed)                invalidate();                break;                            case MotionEvent.ACTION_CANCEL:                onStopTrackingTouch();                setPressed(false);                invalidate(); // see above explanation                break;        }        return true;    }        protected void trackTouchEvent(MotionEvent event)    {            final int height = getHeight();        final int available = height - getPaddingLeft() - getPaddingRight();        int y = (int)(height - event.getY());        float scale;        float progress = 0;        if (y < getPaddingLeft()) {            scale = 0.0f;        } else if (y > height - getPaddingRight()) {            scale = 1.0f;        } else {            scale = (float)(y - getPaddingLeft()) / (float)available;            float mTouchProgressOffset = 0.0f;            try            {            Field mTouchProgressOffset_f = this.getClass().getSuperclass().getDeclaredField("mTouchProgressOffset");            mTouchProgressOffset_f.setAccessible(true);            mTouchProgressOffset = mTouchProgressOffset_f.getFloat(this);            }            catch(Exception e)            {    e.printStackTrace();            }            progress = mTouchProgressOffset;        }                final int max = getMax();        progress += scale * max;                try        {        Method setProgress = this.getClass().getSuperclass().getSuperclass().getDeclaredMethod("setProgress", int.class,boolean.class);        setProgress.setAccessible(true);        setProgress.invoke(this, (int)progress, true);        }        catch(Exception e)        {e.printStackTrace();        }    }}

一个运行的截图

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本文链接:

http://blog.csdn.net/failure01/article/details/8577675

参考文档链接：

http://www.eoeandroid.com/thread-430-1-1.html

http://blog.csdn.net/saintswordsman/article/details/5248233

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