Android怎么绘制双折线图
发表于：2025-01-19 作者：千家信息网编辑
千家信息网最后更新 2025年01月19日，本篇内容主要讲解"Android怎么绘制双折线图"，感兴趣的朋友不妨来看看。本文介绍的方法操作简单快捷，实用性强。下面就让小编来带大家学习"Android怎么绘制双折线图"吧!自定义View实现双折线
千家信息网最后更新 2025年01月19日Android怎么绘制双折线图
本篇内容主要讲解"Android怎么绘制双折线图"，感兴趣的朋友不妨来看看。本文介绍的方法操作简单快捷，实用性强。下面就让小编来带大家学习"Android怎么绘制双折线图"吧!
自定义View实现双折线图，可点击，点击后带标签描述，暂未实现拖动的功能，实现效果如下：
代码如下：
首先，自定义布局属性：
LineChart的实现如下：
class LineChart @JvmOverloads constructor( context: Context, attrs: AttributeSet? = null, @AttrRes defStyleAttr: Int = 0) : View(context, attrs, defStyleAttr) { companion object { privateval DEFAULT_MAX_YVALUE = 5000 privateval DEFAULT_YLABEL_COUNT = 4 privateval DEFAULT_XLABEL_TEXT_SIZE = SizeUtil.sp2px(10f) privateval DEFAULT_XLABEL_TEXT_COLOR = Color.parseColor("#999999") privateval DEFAULT_XLABEL_TEXT_MARGIN_TOP = SizeUtil.dp2px(10f) privateval DEFAULT_SHOW_YLABEL_TEXT = false privateval DEFAULT_YLABEL_TEXT_SIZE = SizeUtil.sp2px(11f) privateval DEFAULT_YLABEL_TEXT_COLOR = Color.BLACK privateval DEFAULT_YLABEL_TEXT_MARGIN_LEFT = SizeUtil.dp2px(15f) privateval DEFAULT_AXIS_WIDTH = SizeUtil.dp2px(0.5f) privateval DEFAULT_AXIS_COLOR = Color.parseColor("#F1F1F1") privateval DEFAULT_SHOW_SCALE = true privateval DEFAULT_SCALE_LENGTH = SizeUtil.dp2px(4f) privateval DEFAULT_SHOW_GRID = true privateval DEFAULT_GRID_WIDTH = SizeUtil.dp2px(0.5f) privateval DEFAULT_GRID_DASH_INTERVAL = SizeUtil.dp2px(1f) privateval DEFAULT_GRID_DASH_LENGTH = SizeUtil.dp2px(2f) privateval DEFAULT_GRID_COLOR = Color.parseColor("#F1F1F1") privateval DEFAULT_LINE_WIDTH = SizeUtil.dp2px(1.5f) privateval DEFAULT_LINE_COLOR1 = Color.parseColor("#60BF56") privateval DEFAULT_LINE_COLOR2 = Color.parseColor("#108EE9") privateval DEFAULT_LABEL_WIDTH = SizeUtil.dp2px(135f) privateval DEFAULT_LABEL_HEIGHT = SizeUtil.dp2px(78f) privateval DEFAULT_LABEL_BACKGROUND_COLOR = Color.WHITE privateval DEFAULT_LABEL_RADIUS = SizeUtil.dp2px(3f) privateval DEFAULT_LABEL_TEXT_SIZE = SizeUtil.sp2px(11f) privateval DEFAULT_LABEL_TEXT_COLOR = Color.parseColor("#333333") privateval DEFAULT_LABEL_ARROW_WIDTH = SizeUtil.dp2px(8f) privateval DEFAULT_LABEL_ARROW_HEIGHT = SizeUtil.dp2px(2f) privateval DEFAULT_LABEL_ARROW_OFFSET = SizeUtil.dp2px(31f) privateval DEFAULT_LABEL_ARROW_MARGIN = SizeUtil.dp2px(14.5f) privateval DEFAULT_CLICKABLE = true privateval DEFAULT_LEFT_MARGIN = SizeUtil.dp2px(15f) privateval DEFAULT_TOP_MARGIN = SizeUtil.dp2px(118f) privateval DEFAULT_RIGHT_MARGIN = SizeUtil.dp2px(15f) privateval DEFAULT_BOTTOM_MARGIN = SizeUtil.dp2px(70f) } //Y轴最大值 var maxYValue: Int = DEFAULT_MAX_YVALUE //Y轴上的刻度值个数 var yLabelCount: Int = DEFAULT_YLABEL_COUNT //X轴刻度值文本字体大小 var xLabelTextSize: Float = DEFAULT_XLABEL_TEXT_SIZE //X轴刻度值文本字体颜色 var xLabelTextColor: Int = DEFAULT_XLABEL_TEXT_COLOR //X轴刻度值文本到X轴的上边距 var xLabelTextMarginTop: Float = DEFAULT_XLABEL_TEXT_MARGIN_TOP //是否显示Y轴刻度值文本 var showYLabelText: Boolean = DEFAULT_SHOW_YLABEL_TEXT //Y轴刻度值文本字体大小 var yLabelTextSize: Float = DEFAULT_YLABEL_TEXT_SIZE //Y轴刻度值文本字体颜色 var yLabelTextColor: Int = DEFAULT_YLABEL_TEXT_COLOR //Y轴刻度值文本到屏幕左侧的左边距 var yLabelTextMarginLeft: Float = DEFAULT_YLABEL_TEXT_MARGIN_LEFT //X轴宽度 var axisWidth: Float = DEFAULT_AXIS_WIDTH //X轴颜色 var axisColor: Int = DEFAULT_AXIS_COLOR //是否显示轴线上的小刻度线，默认显示 var showScale: Boolean = DEFAULT_SHOW_SCALE //X轴上的小刻度线长度 var scaleLength: Float = DEFAULT_SCALE_LENGTH //是否显示网格，默认显示 var showGrid: Boolean = DEFAULT_SHOW_GRID //网格线宽度 var gridWidth: Float = DEFAULT_GRID_WIDTH //网格线组成虚线的线段之间的间隔 var gridDashInterval: Float = DEFAULT_GRID_DASH_INTERVAL //网格线组成虚线的线段长度 var gridDashLength: Float = DEFAULT_GRID_DASH_LENGTH //网格线颜色 var gridColor: Int = DEFAULT_GRID_COLOR //折线宽度 var lineWidth: Float = DEFAULT_LINE_WIDTH //折线一颜色 var lineColor1: Int = DEFAULT_LINE_COLOR1 //折线二颜色 var lineColor2: Int = DEFAULT_LINE_COLOR2 //标签的矩形宽度 var labelWidth: Float = DEFAULT_LABEL_WIDTH //标签的矩形高度 var labelHeight: Float = DEFAULT_LABEL_HEIGHT //标签背景颜色 var labelBackgroundColor = DEFAULT_LABEL_BACKGROUND_COLOR //标签的矩形圆角 var labelRadius: Float = DEFAULT_LABEL_RADIUS //标签内文本字体大小 var labelTextSize: Float = DEFAULT_LABEL_TEXT_SIZE //标签内文本字体颜色 var labelTextColor: Int = DEFAULT_LABEL_TEXT_COLOR //标签的箭头宽度 var labelArrowWidth: Float = DEFAULT_LABEL_ARROW_WIDTH //标签的箭头高度 var labelArrowHeight: Float = DEFAULT_LABEL_ARROW_HEIGHT //标签的箭头到标签左侧或右侧的偏移量 var labelArrowOffset: Float = DEFAULT_LABEL_ARROW_OFFSET //标签的箭头到坐标轴最上方的下边距 var labelArrowMargin: Float = DEFAULT_LABEL_ARROW_MARGIN //是否可点击 var clickAble: Boolean = DEFAULT_CLICKABLE //坐标轴到View左侧的边距，多出来的空间可以用来绘制Y轴刻度文本 var leftMargin: Float = DEFAULT_LEFT_MARGIN //坐标轴到View顶部的边距，多出来的空间可以用来绘制标签信息 var topMargin: Float = DEFAULT_TOP_MARGIN //坐标轴到View右侧的边距 var rightMargin: Float = DEFAULT_RIGHT_MARGIN //坐标轴到View底部的边距，多出来的空间可以用来绘制X轴刻度文本 var bottomMargin: Float = DEFAULT_BOTTOM_MARGIN private var mCurrentDrawIndex = 0 private lateinit var mAxisPaint: Paint //绘制轴线和轴线上的小刻度线 private lateinit var mGridPaint: Paint //绘制网格线 private lateinit var mLinePaint: Paint //绘制折线 private lateinit var mLabelPaint: Paint //绘制最上方标签 private lateinit var mLabelBgPaint: Paint //绘制标签背景，带阴影效果 private lateinit var mTextPaint: Paint //绘制文本 private lateinit var mLabelRectF: RectF //最上方的标签对应的矩形 private var mWidth: Int = 0 private var mHeight: Int = 0 private var mXPoint: Float = 0f //原点的X坐标 private var mYPoint: Float = 0f //原点的Y坐标 private var mXScale: Float = 0f //X轴刻度长度 private var mYScale: Float = 0f //Y轴刻度长度 private var mXLength: Float = 0f //X轴长度 private var mYLength: Float = 0f //Y轴长度 private var mClickIndex: Int = 0 //点击时的下标 private var mDataList1: MutableList = mutableListOf() //折线一(交易收益)对应数据 private var mDataList2: MutableList = mutableListOf() //折线二(返现收益)对应数据 //记录每个数据点的X、Y坐标 private var mDataPointList1: MutableList = mutableListOf() private var mDataPointList2: MutableList = mutableListOf() private var mXLabelList: MutableList = mutableListOf() //X轴刻度值 private var mYLabelList: MutableList = mutableListOf() //Y轴刻度值 init { setLayerType(LAYER_TYPE_SOFTWARE, null) //关闭硬件加速，解决在部分手机无法实现虚线效果 attrs?.let { parseAttribute(getContext(), it) } initPaint() setYLable() } //初始化Y轴刻度值 private fun setYLable() { mYLabelList.clear() val increment = maxYValue / yLabelCount.toFloat() for (i in 0..yLabelCount) { var text = "" if (i == 0) { text = "0" } else { val value = (increment * i * 100).toInt() / 100f if (value == value.toInt().toFloat()) { text = value.toInt().toString() } else { text = value.toString() } } mYLabelList.add(text) } } //获取布局属性并设置属性默认值 private fun parseAttribute(context: Context, attrs: AttributeSet) { val ta = context.obtainStyledAttributes(attrs, R.styleable.LineChart) maxYValue = ta.getInt(R.styleable.LineChart_maxYValue, DEFAULT_MAX_YVALUE) yLabelCount = ta.getInt(R.styleable.LineChart_yLabelCount, DEFAULT_YLABEL_COUNT) xLabelTextSize = ta.getDimension(R.styleable.LineChart_xLabelTextSize, DEFAULT_XLABEL_TEXT_SIZE) xLabelTextColor = ta.getColor(R.styleable.LineChart_xLabelTextColor, DEFAULT_XLABEL_TEXT_COLOR) xLabelTextMarginTop = ta.getDimension(R.styleable.LineChart_xLabelTextMarginTop, DEFAULT_XLABEL_TEXT_MARGIN_TOP) showYLabelText = ta.getBoolean(R.styleable.LineChart_showYLabelText, DEFAULT_SHOW_YLABEL_TEXT) yLabelTextSize = ta.getDimension(R.styleable.LineChart_yLabelTextSize, DEFAULT_YLABEL_TEXT_SIZE) yLabelTextColor = ta.getColor(R.styleable.LineChart_yLabelTextColor, DEFAULT_YLABEL_TEXT_COLOR) yLabelTextMarginLeft = ta.getDimension(R.styleable.LineChart_yLabelTextMarginLeft, DEFAULT_YLABEL_TEXT_MARGIN_LEFT) axisWidth = ta.getDimension(R.styleable.LineChart_axisWidth, DEFAULT_AXIS_WIDTH) axisColor = ta.getColor(R.styleable.LineChart_axisColor, DEFAULT_AXIS_COLOR) showScale = ta.getBoolean(R.styleable.LineChart_showScale, DEFAULT_SHOW_SCALE) scaleLength = ta.getDimension(R.styleable.LineChart_scaleLength, DEFAULT_SCALE_LENGTH) showGrid = ta.getBoolean(R.styleable.LineChart_showGrid, DEFAULT_SHOW_GRID) gridWidth = ta.getDimension(R.styleable.LineChart_gridWidth, DEFAULT_GRID_WIDTH) gridDashInterval = ta.getDimension(R.styleable.LineChart_gridDashInterval, DEFAULT_GRID_DASH_INTERVAL) gridDashLength = ta.getDimension(R.styleable.LineChart_gridDashLength, DEFAULT_GRID_DASH_LENGTH) gridColor = ta.getColor(R.styleable.LineChart_gridColor, DEFAULT_GRID_COLOR) lineWidth = ta.getDimension(R.styleable.LineChart_lineWidth, DEFAULT_LINE_WIDTH) lineColor1 = ta.getColor(R.styleable.LineChart_lineColor1, DEFAULT_LINE_COLOR1) lineColor2 = ta.getColor(R.styleable.LineChart_lineColor2, DEFAULT_LINE_COLOR2) labelWidth = ta.getDimension(R.styleable.LineChart_labelWidth, DEFAULT_LABEL_WIDTH) labelHeight = ta.getDimension(R.styleable.LineChart_labelHeight, DEFAULT_LABEL_HEIGHT) labelBackgroundColor = ta.getColor(R.styleable.LineChart_labelBackgroundColor, DEFAULT_LABEL_BACKGROUND_COLOR) labelRadius = ta.getDimension(R.styleable.LineChart_labelRadius, DEFAULT_LABEL_RADIUS) labelTextSize = ta.getDimension(R.styleable.LineChart_labelTextSize, DEFAULT_LABEL_TEXT_SIZE) labelTextColor = ta.getColor(R.styleable.LineChart_labelTextColor, DEFAULT_LABEL_TEXT_COLOR) labelArrowWidth = ta.getDimension(R.styleable.LineChart_labelArrowWidth, DEFAULT_LABEL_ARROW_WIDTH) labelArrowHeight = ta.getDimension(R.styleable.LineChart_labelArrowHeight, DEFAULT_LABEL_ARROW_HEIGHT) labelArrowOffset = ta.getDimension(R.styleable.LineChart_labelArrowMargin, DEFAULT_LABEL_ARROW_OFFSET) labelArrowMargin = ta.getDimension(R.styleable.LineChart_labelArrowMargin, DEFAULT_LABEL_ARROW_MARGIN) clickAble = ta.getBoolean(R.styleable.LineChart_clickAble, DEFAULT_CLICKABLE) leftMargin = ta.getDimension(R.styleable.LineChart_leftMargin, DEFAULT_LEFT_MARGIN) topMargin = ta.getDimension(R.styleable.LineChart_topMargin, DEFAULT_TOP_MARGIN) rightMargin = ta.getDimension(R.styleable.LineChart_rightMargin, DEFAULT_RIGHT_MARGIN) bottomMargin = ta.getDimension(R.styleable.LineChart_bottomMargin, DEFAULT_BOTTOM_MARGIN) ta.recycle() } //初始化画笔 private fun initPaint() { mAxisPaint = Paint() with(mAxisPaint) { isAntiAlias = true color = axisColor strokeWidth = axisWidth } mGridPaint = Paint() with(mGridPaint) { isAntiAlias = true color = gridColor strokeWidth = gridWidth setPathEffect(DashPathEffect(floatArrayOf(gridDashLength, gridDashInterval), 0f)) //设置虚线效果 } mLinePaint = Paint() with(mLinePaint) { isAntiAlias = true strokeWidth = lineWidth style = Paint.Style.STROKE } mLabelPaint = Paint() with(mLabelPaint) { isAntiAlias = true } mLabelBgPaint = Paint() with(mLabelBgPaint) { isAntiAlias = true color = labelBackgroundColor } mTextPaint = Paint() with(mTextPaint) { isAntiAlias = true textAlign = Paint.Align.CENTER } mLabelRectF = RectF() } override fun onMeasure(widthMeasureSpec: Int, heightMeasureSpec: Int) { super.onMeasure(widthMeasureSpec, heightMeasureSpec) val heightMode = MeasureSpec.getMode(heightMeasureSpec) val heightSize = MeasureSpec.getSize(heightMeasureSpec) var height = 0 if (heightMode == MeasureSpec.EXACTLY) { height = heightSize } else { height = SizeUtil.dp2px(308f).toInt() if (heightMode == MeasureSpec.AT_MOST) { height = Math.min(height, heightSize) } } setMeasuredDimension(measuredWidth, height) } override fun onTouchEvent(event: MotionEvent?): Boolean { val touchX = event?.getX() ?: 0f for (i in 0..mDataPointList1.size - 1) { val centerX = mDataPointList1[i].x var beginX = centerX - mXScale / 2f var endX = centerX + mXScale / 2f if (i == 0) { beginX = 0f } if (i == mDataPointList1.size - 1) { endX = mWidth.toFloat() } if (beginX < touchX && touchX < endX) { mClickIndex = i invalidate() break } } return true } override fun onDraw(canvas: Canvas?) { canvas?.let { initSize(width, height) //初始化尺寸信息 drawCoordinate(it) //绘制坐标轴 drawLine(it) //绘制折线 drawLabel(it) //绘制点击后的效果 drawBottomDescription(it) //绘制底部类型说明 } } //初始化尺寸信息 private fun initSize(width: Int, height: Int) { mWidth = width mHeight = height mXLength = mWidth - leftMargin - rightMargin mYLength = mHeight - topMargin - bottomMargin mXPoint = leftMargin mYPoint = mHeight - bottomMargin mXScale = mXLength / (mXLabelList.size - 1) mYScale = mYLength / yLabelCount mDataPointList1.clear() if (hasOnlyOneData()) { mDataPointList1.add(PointF(mXPoint + mXLength / 2f, calculateYPosition(mDataList1.get(0)))) //居中 } else { for (i in 0..mDataList1.size - 1) { mDataPointList1.add(PointF(mXPoint + i * mXScale, calculateYPosition(mDataList1.get(i)))) } } mDataPointList2.clear() if (hasOnlyOneData()) { mDataPointList2.add(PointF(mXPoint + mXLength / 2f, calculateYPosition(mDataList2.get(0)))) //居中 } else { for (i in 0..mDataList2.size - 1) { mDataPointList2.add(PointF(mXPoint + i * mXScale, calculateYPosition(mDataList2.get(i)))) } } } //绘制坐标轴 private fun drawCoordinate(canvas: Canvas) { //绘制X轴 canvas.drawLine(mXPoint - axisWidth / 2f, mYPoint, mXPoint + mXLength + axisWidth / 2f, mYPoint, mAxisPaint) with(mTextPaint) { textSize = xLabelTextSize color = xLabelTextColor } val fm = mTextPaint.getFontMetrics() val yOffset = mYPoint + xLabelTextMarginTop - fm.ascent for (i in 0..mXLabelList.size - 1) { //绘制X轴的刻度值文本 if (i == 0) { //第一个刻度值文本 if (hasOnlyOneData()) { //只有一条数据时居中显示 mTextPaint.textAlign = Paint.Align.CENTER canvas.drawText(mXLabelList[i], mDataPointList1[i].x, yOffset, mTextPaint) } else { mTextPaint.textAlign = Paint.Align.LEFT canvas.drawText(mXLabelList[i], mXPoint, yOffset, mTextPaint) } } else if (i == mXLabelList.size - 1) { //最后一个刻度值文本 mTextPaint.textAlign = Paint.Align.RIGHT canvas.drawText(mXLabelList[i], mXPoint + mXLength, yOffset, mTextPaint) } else { mTextPaint.textAlign = Paint.Align.CENTER canvas.drawText(mXLabelList[i], mXPoint + i * mXScale, yOffset, mTextPaint) } //绘制X轴上的小刻度线 if (showScale) { canvas.drawLine( mXPoint + i * mXScale, mYPoint, mXPoint + i * mXScale, mYPoint - scaleLength, mAxisPaint ) } } for (i in 0..yLabelCount - 1) { //绘制网格线：横刻线 if (showGrid) { mGridPaint.color = gridColor canvas.drawLine( mXPoint, mYPoint - (i + 1) * mYScale, mXPoint + mXLength, mYPoint - (i + 1) * mYScale, mGridPaint ) } //绘制Y轴上的刻度值 if (showYLabelText) { with(mTextPaint) { textSize = yLabelTextSize color = yLabelTextColor textAlign = Paint.Align.LEFT } if (i == 0) { canvas.drawText(mYLabelList[i], yLabelTextMarginLeft, mYPoint, mTextPaint) } val yLabelFm = mTextPaint.getFontMetrics() val yLabelYOffset = mYPoint + (yLabelFm.descent - yLabelFm.ascent) / 2f - yLabelFm.descent - (i + 1) * mYScale canvas.drawText(mYLabelList[i + 1], yLabelTextMarginLeft, yLabelYOffset, mTextPaint) } } } //绘制折线 private fun drawLine(canvas: Canvas) { if (mDataList1 == null || mDataList1.size <= 0 || mDataList2 == null || mDataList2.size <= 0) { return } if (hasOnlyOneData()) { //处理只有一条数据的情况 //绘制第一条直线 mLinePaint.color = lineColor1 canvas.drawLine(mXPoint, mDataPointList1[0].y, mXPoint + mXLength, mDataPointList1[0].y, mLinePaint) //绘制第二条直线 mLinePaint.color = lineColor2 canvas.drawLine(mXPoint, mDataPointList2[0].y, mXPoint + mXLength, mDataPointList2[0].y, mLinePaint) return } for (i in 0..mDataPointList1.size - 2) { if (i <= mCurrentDrawIndex) { //绘制第一条折线 //绘制折线 mLinePaint.color = lineColor1 canvas.drawLine( mDataPointList1[i].x, mDataPointList1[i].y, mDataPointList1[i + 1].x, mDataPointList1[i + 1].y, mLinePaint ) //绘制折线交点 canvas.drawCircle(mDataPointList1[i].x, mDataPointList1[i].y, lineWidth * 1.5f, mLinePaint) mLinePaint.color = Color.WHITE canvas.drawCircle(mDataPointList1[i].x, mDataPointList1[i].y, lineWidth * 0.5f, mLinePaint) //绘制第二条折线 //绘制折线 mLinePaint.color = lineColor2 canvas.drawLine( mDataPointList2[i].x, mDataPointList2[i].y, mDataPointList2[i + 1].x, mDataPointList2[i + 1].y, mLinePaint ) //绘制折线交点 canvas.drawCircle(mDataPointList2[i].x, mDataPointList2[i].y, lineWidth * 1.5f, mLinePaint) mLinePaint.color = Color.WHITE canvas.drawCircle(mDataPointList2[i].x, mDataPointList2[i].y, lineWidth * 0.5f, mLinePaint) //绘制最后一个折线交点 if (i == mDataPointList1.size - 2) { mLinePaint.color = lineColor1 canvas.drawCircle( mDataPointList1[mDataPointList1.size - 1].x, mDataPointList1[mDataPointList1.size - 1].y, lineWidth * 1.5f, mLinePaint ) mLinePaint.color = Color.WHITE canvas.drawCircle( mDataPointList1[mDataPointList1.size - 1].x, mDataPointList1[mDataPointList1.size - 1].y, lineWidth * 0.5f, mLinePaint ) mLinePaint.color = lineColor2 canvas.drawCircle( mDataPointList2[mDataPointList2.size - 1].x, mDataPointList2[mDataPointList2.size - 1].y, lineWidth * 1.5f, mLinePaint ) mLinePaint.color = Color.WHITE canvas.drawCircle( mDataPointList2[mDataPointList2.size - 1].x, mDataPointList2[mDataPointList2.size - 1].y, lineWidth * 0.5f, mLinePaint ) } } } } //计算数值对应的Y坐标 private fun calculateYPosition(data: Float): Float = mYPoint - data / maxYValue * mYLength //绘制点击后的详情展示 private fun drawLabel(canvas: Canvas) { if (clickAble && mDataList1.size > 0) { //绘制点击后的竖刻线 mLabelPaint.color = Color.parseColor("#EBEBEB") mLabelPaint.strokeWidth = DEFAULT_GRID_WIDTH * 2 canvas.drawLine( mDataPointList1[mClickIndex].x, mYPoint, mDataPointList1[mClickIndex].x, topMargin - labelArrowMargin, mLabelPaint ) //绘制点击后的折线交点 mLabelPaint.color = lineColor1 canvas.drawCircle( mDataPointList1[mClickIndex].x, mDataPointList1[mClickIndex].y, lineWidth * 2.3f, mLabelPaint ) mLabelPaint.color = lineColor2 canvas.drawCircle( mDataPointList2[mClickIndex].x, mDataPointList2[mClickIndex].y, lineWidth * 2.3f, mLabelPaint ) //绘制最上方标签信息 with(mLabelRectF) { bottom = topMargin - labelArrowMargin - labelArrowHeight top = bottom - labelHeight; left = mDataPointList1[mClickIndex].x - labelArrowWidth / 2f - labelArrowOffset right = left + labelWidth //处理点击第一项出现标签偏离整个折线图现象 if (left < 0) { left = SizeUtil.dp2px(5f) right = left + labelWidth } //处理点击最后一项出现标签偏离整个折线图现象 if (right > mWidth) { right = mWidth.toFloat() - SizeUtil.dp2px(5f) left = right - labelWidth } } //绘制圆角矩形 mLabelBgPaint.setShadowLayer( SizeUtil.dp2px(12f), //阴影效果 SizeUtil.dp2px(2.5f), SizeUtil.dp2px(1.5f), Color.parseColor("#C7C7C7") ) canvas.drawRoundRect(mLabelRectF, labelRadius, labelRadius, mLabelBgPaint) //绘制箭头 val arrowPath = Path() with(arrowPath) { moveTo(mDataPointList1[mClickIndex].x, topMargin - labelArrowMargin) val baseY = topMargin - labelArrowMargin - labelArrowHeight - SizeUtil.dp2px(1f) lineTo(mDataPointList1[mClickIndex].x - labelArrowWidth / 2f, baseY) lineTo(mDataPointList1[mClickIndex].x + labelArrowWidth / 2f, baseY) close() } mLabelPaint.color = labelBackgroundColor canvas.drawPath(arrowPath, mLabelPaint) mLabelPaint.color = Color.parseColor("#F1F1F1") mLabelPaint.strokeWidth = gridWidth canvas.drawLine( mLabelRectF.left + SizeUtil.dp2px(10f), mLabelRectF.bottom - SizeUtil.dp2px(52f), mLabelRectF.right - SizeUtil.dp2px(10f), mLabelRectF.bottom - SizeUtil.dp2px(52f), mLabelPaint ) //绘制文字 with(mTextPaint) { color = labelTextColor textSize = labelTextSize textAlign = Paint.Align.LEFT } canvas.drawText( mXLabelList[mClickIndex], mLabelRectF.left + SizeUtil.dp2px(9.5f), mLabelRectF.bottom - SizeUtil.dp2px(61f), mTextPaint ) canvas.drawText( "交易收益 ¥${mDataList1[mClickIndex]}", mLabelRectF.left + SizeUtil.dp2px(19.5f), mLabelRectF.bottom - SizeUtil.dp2px(32.5f), mTextPaint ) canvas.drawText( "返现收益 ¥${mDataList2[mClickIndex]}", mLabelRectF.left + SizeUtil.dp2px(19.5f), mLabelRectF.bottom - SizeUtil.dp2px(12.5f), mTextPaint ) mTextPaint.color = lineColor1 canvas.drawCircle( mLabelRectF.left + SizeUtil.dp2px(12.5f), mLabelRectF.bottom - SizeUtil.dp2px(36f), SizeUtil.dp2px(2.5f), mTextPaint ) mTextPaint.color = lineColor2 canvas.drawCircle( mLabelRectF.left + SizeUtil.dp2px(12.5f), mLabelRectF.bottom - SizeUtil.dp2px(16f), SizeUtil.dp2px(2.5f), mTextPaint ) } } //绘制底部类型说明 private fun drawBottomDescription(canvas: Canvas) { if (mDataList1 == null || mDataList1.size == 0 || mDataList2 == null || mDataList2.size == 0) { return } mTextPaint.color = lineColor1 val centerX1 = mWidth / 2f - SizeUtil.dp2px(75.5f) canvas.drawCircle( centerX1, mHeight - SizeUtil.dp2px(20f), SizeUtil.dp2px(3.5f), mTextPaint ) mTextPaint.color = lineColor2 val centerX2 = mWidth / 2f + SizeUtil.dp2px(16f) canvas.drawCircle( centerX2, mHeight - SizeUtil.dp2px(20f), SizeUtil.dp2px(3.5f), mTextPaint ) mTextPaint.color = Color.WHITE canvas.drawCircle( centerX1, mHeight - SizeUtil.dp2px(20f), SizeUtil.dp2px(2.2f), mTextPaint ) canvas.drawCircle( centerX2, mHeight - SizeUtil.dp2px(20f), SizeUtil.dp2px(2.2f), mTextPaint ) with(mTextPaint) { color = labelTextColor textSize = SizeUtil.sp2px(12f) } canvas.drawText( "交易收益", centerX1 + SizeUtil.dp2px(8f), mHeight - SizeUtil.dp2px(15.5f), mTextPaint ) canvas.drawText( "返现收益", centerX2 + SizeUtil.dp2px(8f), mHeight - SizeUtil.dp2px(15.5f), mTextPaint ) } //格式化标签内的数值文本 private fun formatValue(value: Float): String { val scale = maxYValue / yLabelCount.toFloat() if (scale < 10 && (value != value.toInt().toFloat()) && (value >= 0.01f)) { return "${(value * 100).toInt().toFloat() / 100}" //保留2位小数，但不四舍五入 } return "${value.toInt()}" } //是否只有一条数据 private fun hasOnlyOneData(): Boolean = mDataList1.size == 1 && mDataList2.size == 1 && mXLabelList.size == 1 //设置数据，startAnim：是否开启动画，动画默认一条一条折线的画 //list1和list2的数据个数要相同，dateList的数据个数大于等于list1和list2的数据个数 fun drawData(list1: MutableList, list2: MutableList, dateList: MutableList, startAnim: Boolean = false) { if (list1.size != list2.size) { throw RuntimeException("the size of list1 must be equal to the size of list2") } if (dateList.size < list1.size) { throw RuntimeException("the size of dateList can not less than the size of list1") } var maxValue = 0f for (item in list1) { if (maxValue <= item) { maxValue = item } } for (item in list2) { if (maxValue <= item) { maxValue = item } } mDataList1 = list1 mDataList2 = list2 mXLabelList = dateList maxYValue = calculateMaxValue(maxValue) mClickIndex = 0 setYLable() //重新设置Y轴刻度值 if (startAnim) { val animator = ValueAnimator.ofInt(0, mDataList1.size - 2) animator.setDuration(1500) animator.addUpdateListener { mCurrentDrawIndex = it.getAnimatedValue() as Int invalidate() } animator.interpolator = LinearInterpolator() animator.start() } else { mCurrentDrawIndex = mDataList1.size - 2 invalidate() } } //计算Y轴最大值和单位，计算规则：最高位数加1取整 private fun calculateMaxValue(value: Float): Int { val valueStr = value.toLong().toString() val length = valueStr.length //整数的位数 val unit = Math.pow(10.0, (length - 1).toDouble()).toInt() if (value == 0f) { return DEFAULT_MAX_YVALUE //如果最大值是0，即所有数据都是0，取默认的最大值 } else if (value % unit == 0f) { return value.toInt() } else { return ((value / unit).toInt() + 1) * unit } } } 使用举例：
private fun createType2Data(count: Int, isDateMore: Boolean = false, startAnim: Boolean = false, showYLabelText: Boolean = false) { val list1: MutableList = mutableListOf() val list2: MutableList = mutableListOf() val dateList: MutableList = mutableListOf() for (i in 0..count) { list1.add(Random.nextDouble(80.0).toFloat()) list2.add(Random.nextDouble(80.0).toFloat()) dateList.add(DateUtil.getDistanceDateByDay(i - count, DateUtil.M_D)) } if (isDateMore) { dateList.add(DateUtil.getDistanceDateByDay(1, DateUtil.M_D)) } if (showYLabelText) { binding.type2Lc.leftMargin = SizeUtil.dp2px(40f) } else { binding.type2Lc.leftMargin = SizeUtil.dp2px(15f) } binding.type2Lc.showYLabelText = showYLabelText binding.type2Lc.drawData(list1, list2, dateList, startAnim) } 到此，相信大家对"Android怎么绘制双折线图"有了更深的了解，不妨来实际操作一番吧！这里是网站，更多相关内容可以进入相关频道进行查询，关注我们，继续学习！
刻度
标签
文本
坐标
折线
数据
颜色
坐标轴
网格
字体
收益
效果
长度
线图
宽度
矩形
箭头
最大
个数
信息
数据库的安全要保护哪些东西
数据库安全各自的含义是什么
生产安全数据库录入
数据库的安全性及管理
数据库安全策略包含哪些
海淀数据库安全审计系统
建立农村房屋安全信息数据库
易用的数据库客户端支持安全管理
连接数据库失败ssl安全错误
数据库的锁怎样保障安全
csgo国际服服务器怎么进不去
qpm管理服务器
一个国家的网络安全
数据库技术与应用清华出版社
数据库用退出嘛
购买失败苹果服务器返回错误
数据库系统dbs包括6
宝塔服务器进程管理
广西量化积分管理软件开发公司
关系数据库大数据查询优化
重庆软件开发工资多少
方舟进官方服务器要买地图吗
数据库期末实验
GUI向数据库添加数据
2020全球网络安全
怎么对付未成年人的网络安全
湖北方便网络安全维护要多少钱
数据库软件如何使用方法
为新时代网络安全贡献上海力量
无链接服务器
单片机转移数据库
张家界软件开发培训
数据库创建表保存后找不到
提升网络安全治理
广东标准软件开发代理价钱
没有网络怎么开启服务器
内网邮件怎样通过服务器
数据库ci cd
智造软件开发小程序
网络安全法治保障法
