Android 自定义View——拖动选择时间控件

来源：互联网发布：ubuntu 杀死进程编辑：程序博客网时间：2024/06/03 20:25

前段时间在项目中遇到一个自定义控件，需要实现拖动一个类似SeekBar的东西来选择时间段。花费了一些时间和精力搞了出来。效果图如下

这里写图片描述

具体的代码和注释在源码中都有，这里只贴出关键代码

关键代码

 @Override    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {        super.onMeasure(widthMeasureSpec, heightMeasureSpec);        String measureHeight = "获取文本高度";        paint.getTextBounds(measureHeight, 0, measureHeight.length(), textound);        //计算控件高度        timeheight = textound.height() + marginText + blockHeight + marginTimeBlock + seekBarHeight;        /**         * 高度为时间控件所需的高度，宽度占满屏幕宽度         */        setMeasuredDimension(timeWidth, timeheight);    }

@Override    protected void onDraw(Canvas canvas) {        //绘制不可能选择的时间块        if (disSelectBlock != null && disSelectBlock.size() > 0) {            Rect rect = new Rect(0,0,blockWidth,blockHeight);            RectF rectf = new RectF();            rectf.top = marginText + textound.height();            rectf.bottom = textound.height() + blockHeight;            BitmapFactory.Options options = new BitmapFactory.Options();            options.outWidth = blockWidth;            options.outHeight = blockHeight;            Bitmap notSelectBg = BitmapFactory.decodeResource(getResources(),R.drawable.time_disselect_bg,options);            for (int i = 0; i < disSelectBlock.size(); i++) {                rectf.left =disSelectBlock.get(i) * blockWidth;                rectf.right = disSelectBlock.get(i) * blockWidth+blockWidth;                canvas.drawBitmap(notSelectBg,rect,rectf,null);            }        }        //绘制文字        paint.setColor(getResources().getColor(R.color.white));        int time = beginTime;        int lineStartY = 0;//绘制分割线的起始纵坐标        int lineEndX = textound.height() + blockHeight;//绘制分割线的终止纵坐标        for (int i = 0; i < timeBlockNum; i++) {            if (i % 2 == 0) {                String timeText = time + "时";                paint.getTextBounds(timeText, 0, timeText.length(), textound);                canvas.drawText(timeText, blockWidth + blockWidth * i - textound.height(), textound.height(), paint);                time++;                //短的分割线的起始纵坐标                lineStartY = textound.height() + blockHeight / 2;            } else {                //长的分割线的起始纵坐标                lineStartY = textound.height();            }            lineStartY += marginText;            //绘制时间块分割线            canvas.drawLine(blockWidth * i, lineStartY, blockWidth * i, lineEndX, paint);        }        //绘制最后端的一条分割短线        canvas.drawLine(timeWidth, lineStartY + blockHeight / 2, timeWidth, lineEndX, paint);        paint.setStrokeWidth(1);        paint.setColor(getResources().getColor(R.color.gray));        //绘制拖动条顶部的线条        canvas.drawLine(0, timeheight - seekBarHeight, timeWidth, timeheight - seekBarHeight, paint);        //绘制拖动条底部的线条        paint.setStrokeWidth(2);        canvas.drawLine(0, timeheight, timeWidth - 2, timeheight - 2, paint);        if (seekBarStart != 0) {            //绘制拖动条尾部            paint.setStrokeWidth(0);            paint.setColor(getResources().getColor(R.color.color_fabe00));            int disNum = seekBarEnd - seekBarStart;            int startX = seekBarStart * blockWidth + bodyDistance;            if (startX < blockWidth) {                startX = blockWidth;            } else if (startX > timeWidth - blockWidth - disNum * blockWidth) {                startX = timeWidth - blockWidth - disNum * blockWidth;            }            int endX = seekBarEnd * blockWidth + moveDistance + bodyDistance;            if (endX > timeWidth - blockWidth) {                endX = timeWidth - blockWidth;            } else if (bodyDistance != 0 && endX < startX + blockWidth * disNum) {                endX = startX + blockWidth * disNum;            } else if (endX < startX + blockWidth) {                endX = startX + blockWidth;            }            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {                canvas.drawRoundRect(startX, timeheight - seekBarHeight + 10, endX, timeheight - 10, 4, 4, paint);            } else {                canvas.drawRect(startX, timeheight - seekBarHeight + 10, endX, timeheight - 10, paint);            }            //绘制拖动条头部圆圈            paint.setColor(getResources().getColor(R.color.color_eb7938));            canvas.drawCircle(endX, timeheight - seekBarHeight / 2, seekBarHeight / 2, paint);            paint.setColor(getResources().getColor(R.color.white));            canvas.drawCircle(endX, timeheight - seekBarHeight / 2, seekBarHeight / 4, paint);        }    }

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源码地址

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