站酷网手机版,互联网项目网站,推销商务网站的途径有哪些,猫眼网站建设目的完成画板demo的前期步骤相关技术、及其使用xml配置文件#xff1a;创建SeekBar比较简单#xff0c;但是不足之处在于当实现横屏的时候就比较麻烦代码创建#xff1a;代码创建SeekBar比较简单#xff0c;能够很好地实现横竖屏切换。2、创建Slider类继承于View初始化线条…目的完成画板demo的前期步骤相关技术、及其使用xml配置文件创建SeekBar比较简单但是不足之处在于当实现横屏的时候就比较麻烦代码创建代码创建SeekBar比较简单能够很好地实现横竖屏切换。2、创建Slider类继承于View初始化线条小圆点进度条的画笔private void init(){// 线条linePaint new Paint(Paint.ANTI_ALIAS_FLAG);linePaint.setColor(lineColor);linePaint.setStrokeWidth(lineSize);//小圆点circlePaint new Paint(Paint.ANTI_ALIAS_FLAG);circlePaint.setColor(thumbColor);circlePaint.setStyle(Paint.Style.FILL);// 进度条progressPaint new Paint(Paint.ANTI_ALIAS_FLAG);progressPaint.setColor(progressColor);progressPaint.setStrokeWidth(lineSize);}3、调用onDraw 方法进行横竖屏的画图protected void onDraw(Canvas canvas) {//canvas 画布if(getWidth() getHeight()){//横着canvas.drawLine(0,getHeight()/2,getWidth(),getHeight()/2,linePaint);if(position 0){//画进度条背景canvas.drawLine(0,getHeight()/2,getWidth(),getHeight()/2,progressPaint);}cy getHeight()/2 ;radius getHeight()/thumbScale;//确定cx的值if(position radius){cx radius;}else if(position getWidth()- radius){cx getWidth() - radius;}else {cx (int)position;}}else {//竖着canvas.drawLine(getWidth()/2,0,getWidth()/2,getHeight(),linePaint);if(position0){canvas.drawLine(getWidth()/2,0,getWidth()/2,position,progressPaint);}cx getWidth()/2;radius getWidth()/thumbScale;//确定中点cy的值if(position radius){cy radius;}else if(position getHeight() - radius){cy getHeight() - radius;}else {cy (int)position;}}//画小圆点if(style SLIDER){canvas.drawCircle(cx,cy,radius,circlePaint);}}4、通过onTouchEvent方法来实现进度条随着触摸位置的改变public boolean onTouchEvent(MotionEvent event) {switch (event.getAction()){case MotionEvent.ACTION_DOWN://小圆点放大thumbScale 2;if(getWidth() getHeight()){//横着 getWidth 表示得到LinearLayout的大小 y不变 x 改变position event.getX();}else {//竖着 x 不变 y 改变position event.getY();if(position 0){position0;}else if(position getHeight()){position getHeight();}}callBake();break;case MotionEvent.ACTION_MOVE://横竖两种情况//获取当前触摸点的值 x yif(getWidth() getHeight()){//横着 getWidth 表示得到LinearLayout的大小 y不变 x 改变position event.getX();}else {//竖着 x 不变 y 改变position event.getY();if(position 0){position0;}else if(position getHeight()){position getHeight();}}callBake();break;case MotionEvent.ACTION_UP:thumbScale 4;break;}if(style SLIDER){//重新绘制invalidate();}return true;}5、写一个获取进度值的方法callback()private void callBake(){if(onSliderChangeListener ! null){if(getWidth() getHeight()){progress position / getWidth();}else {progress position / getHeight();}onSliderChangeListener.progressChanged(progress*max);}}6、定义接口和监听器来监听Slider改变值public void setMax(int max) {this.max max;}public interface OnSliderChangeListener{void progressChanged(float progress);}public void setOnSliderChangeListener(OnSliderChangeListener onSliderChangeListener) {this.onSliderChangeListener onSliderChangeListener;}PS今天画板的前期布局主要是进度条的代码设置进一步的学习了通过代码画图Paint。
