手把手教你画AndroidK线分时图及指标
先废话一下:来到公司之前。项目是由外包公司做的,面试初,没有接触过分时图k线这块,认为好难,我能搞定不。可是一段时间之后,发现之前做的那是一片稀烂,可是这货是主功能啊。迟早的自己操刀,痛下决心,开搞,本想用开源控件。可是想自己实现一下:接着有了本文
開始用surfaceview,可是这货在上下滑动的时候会出现黑边,这个问题我也是纠结了好久,想想产品肯定会打回,打回了还丢脸,算了没多少东西就用view吧,废话真tm多,開始吧。
1,创建项目(Android studio)
2,对了。先上个效果图吧,节省各位的时间:
3,把Activity设置为横屏。不设置也无所谓,我认为横屏的好看点
android:screenOrientation="landscape"
4,建俩基类分时图点数据和K线每点的数据。备注的非常清楚了
/** * 分时所须要的 数据字段 */ public class CMinute { //时间 public long time; //最新价 public double price; //交易量 public long count; //均价 public double average ; //涨跌幅 public double rate ; //价格 public double money ; public long getTime() { return time; } public String getTimeStr() { SimpleDateFormat sdf = new SimpleDateFormat("HH:mm"); try { return sdf.format(new Date(time * 1000)); } catch (Exception e) { return "--:--"; } } }
public class StickData implements Parcelable { //时间 private long time; //开盘 private double open; //收盘 private double close; //最高 private double high; //最低 private double low; //量 private long count; //昨收 private double last; //涨跌幅 private double rate; //价格 private double money; //计算均线的零时保存的值 private double maValue; //5段均线 private double sma5; //10段均线 private double sma10; //20段均线 private double sma20; //量5段均线 private double countSma5; //量10段均线 private double countSma10; //MACD的三个參数 private double dif;//线 private double dea;//线 private double macd;//柱状 //KDJ的三根线 private double k; private double d; private double j; //计算K时须要 private double rsv; //K线资金 //超大单净值 private double sp; //大单净值 private double bg; //中单净值 private double md; //小单净值 private double sm;
5,绘图的步骤
@Override protected void onDraw(Canvas canvas) { super.onDraw(canvas); //1,初始化须要的数据 initWidthAndHeight(); //2。画网格 drawGrid(canvas); //3,画线(分时线的价格线、均价线或K线的均线) drawLines(canvas); if(lineType != TYPE_FENSHI) { //4,假设是K线另外画烛形图 drawCandles(canvas); } //5,写上XY轴的文字(写早了会被覆盖) drawText(canvas); //6,画须要显示的指标 switch (indexType) { case INDEX_VOL: drawVOL(canvas); break; case INDEX_ZJ: drawZJ(canvas); break; case INDEX_MACD: drawMACD(canvas); break; case INDEX_KDJ: drawKDJ(canvas); break; } }
6,绘图实现
事实上分时线就是画线。烛形图也是画线,可是多画个矩形而已,要是分析成这种话,就简单学多了,那么接下来我来教你画线画矩形。。。
。
此处省略10000字,好了说完了(事实上是不用说了,就那么俩方法drawLine,drawRect)。接下来我们重点说说位置的计算:
我们实际拿到的数据,不可能直接展示到坐标系的,由于可能非常大非常小,先来说说Y轴吧
Y轴
y = height - input * height / (max - min);
y:计算结果
height:view高度
max:显示的一组数据最大值
min:显示的一组数据中最小值
展示分时线时,须要在均价和价格取出最大值和最小值
展示K线时,能够从最高和最低中取出最大最小值
X轴
x = width / drawcount * i;
x:计算结果
width:view宽度
drawcount:展示的总个数
如上证指数,上午下午各开盘2小时,由于分时图是按分钟未单位。则drawcount就是60*4。K线则须要依照宽度计算出drawcount,我的代码中,烛形图和烛形图之后的空白比为10:2
7,指标
分时图的资金因为用到了别的接口,demo中就不予展示了,能够參考K线的资金动向指标(就几条线,简单吧)
MACD、KDJ、VOL5、VOL10、VOL20这些指标能够百度一下。我就不多少了。计算方法都一样,我直接贴代码。k线的四个指标,除了资金,其它指标直接能够通过K线的高低开收昨收计算出来的。
public class IndexParseUtil { //均线跨度(SMA5,SMA10,SMA20),注意改动该值时。须要同一时候添加StickData里面的sma字段、改动本类initSma方法,否则不会生效 public static final int START_SMA5 = 5; public static final int START_SMA10 = 10; public static final int START_SMA20 = 20; //26:计算MACD时,26段close均价DIF=(EMA(CLOSE,12) - EMA(CLOSE,26)) public static final int START_DIF = 26; //35:计算MACD时。35段開始取前九日DIF值 DEA:=EMA(DIF,9) public static final int START_DEA = 35; //12:计算K值 public static final int START_K = 12; //15:计算DJ public static final int START_DJ = 15; //9:计算RSV public static final int START_REV = 9; public static final int[] SMA = {START_SMA5,START_SMA10, START_SMA20}; /** * 计算MACD * @param list */ public static void initMACD(List<StickData> list) { if(list == null) return; //1计算出全部的DIF for(int i = 0; i < list.size(); i++) { if(i + START_DIF <= list.size()) { list.get(i + START_DIF - 1).setDif(getCloseSma(list.subList(i + START_DIF - 12, i + START_DIF)) - getCloseSma(list.subList(i + START_DIF - 26, i + START_DIF))); } } //2计算出全部的DEA for(int i = 0; i < list.size(); i++) { if(i + START_DEA <= list.size()) { list.get(i + START_DEA - 1).setDea(getDifSma(list.subList(i + START_DEA - 9, i + START_DEA))); //3计算MACD list.get(i + START_DEA - 1).setMacd(2d * (list.get(i + START_DEA - 1).getDif() - list.get(i + START_DEA - 1).getDea())); } } } /** * 计算KDJ * @param list */ public static void initKDJ(List<StickData> list) { if(list == null) return; //1计算出全部的REV for(int i = 0; i < list.size(); i++) { if(i + START_REV <= list.size()) { //第9日開始计算RSV StickData data = list.get(i + START_REV - 1); double[] maxAndMin = getMaxAndMin(list.subList(i, i + START_REV)); list.get(i + START_REV - 1).setRsv((data.getClose() - maxAndMin[1]) / (maxAndMin[0] - maxAndMin[1]) * 100); } } //2计算出全部K for(int i = 0; i < list.size(); i++) { if(i + START_K <= list.size()) { list.get(i + START_K - 1).setK(getRSVSma(list.subList(i + START_K - 3, i + START_K))); } } //3计算出全部的DJ for(int i = 0; i < list.size(); i++) { if(i + START_DJ <= list.size()) { StickData data = list.get(i + START_DJ - 1); list.get(i + START_DJ - 1).setD(getKSma(list.subList(i + START_DJ - 3, i + START_DJ))); list.get(i + START_DJ - 1).setJ(3 * data.getK() - 2 * data.getD()); } } } /** * 把list里面全部数据相应的均线计算出来而且赋值到里面 * * @param list k线数据 */ public static void initSma(List<StickData> list) { if (list == null) return; for (int i = 0; i < list.size(); i++) { for (int j : SMA) { if (i + j <= list.size()) { //第5日開始计算5日均线 if (j == START_SMA5) { //量的SMA5 list.get(i + j - 1).setCountSma5(getCountSma(list.subList(i, i + j))); //K线的SMA5 list.get(i + j - 1).setSma5(getCloseSma(list.subList(i, i + j))); } else //第10日開始计算10日均线 if (j == START_SMA10) { //量的SMA10 list.get(i + j - 1).setCountSma10(getCountSma(list.subList(i, i + j))); //K线的SMA10 list.get(i + j - 1).setSma10(getCloseSma(list.subList(i, i + j))); }else //第20日開始计算20日均线 if (j == START_SMA20) { //K线的SMA20 list.get(i + j - 1).setSma20(getCloseSma(list.subList(i, i + j))); } } } } } /** * 计算KDJ时,取9日最高最低值 * @param datas * @return */ private static double[] getMaxAndMin(List<StickData> datas) { if(datas == null || datas.size() == 0) return new double[]{0, 0}; double max = datas.get(0).getHigh(); double min = datas.get(0).getLow(); for(StickData data : datas) { max = max > data.getHigh() ? max : data.getHigh(); min = min < data.getLow() ?min : data.getLow(); } return new double[]{max, min}; } /** * K线量计算移动平均值 * @param datas * @return */ private static double getCountSma(List<StickData> datas) { if (datas == null) return -1; double sum = 0; for (StickData data : datas) { sum += data.getCount(); } return NumberUtil.doubleDecimal(sum / datas.size()); } /** * K线收盘价计算移动平均价 * @param datas * @return */ private static double getCloseSma(List<StickData> datas) { if (datas == null) return -1; double sum = 0; for (StickData data : datas) { sum += data.getClose(); } return NumberUtil.doubleDecimal(sum / datas.size()); } /** * K线dif的移动平均值 * @param datas * @return */ private static double getDifSma(List<StickData> datas) { if (datas == null) return -1; double sum = 0; for (StickData data : datas) { sum += data.getDif(); } return NumberUtil.doubleDecimal(sum / datas.size()); } /** * 三日rsv移动平均值,即K值 * @param datas * @return */ private static double getRSVSma(List<StickData> datas) { if (datas == null) return -1; double sum = 0; for (StickData data : datas) { sum += data.getRsv(); } return NumberUtil.doubleDecimal(sum / datas.size()); } /** * 三日K移动平均值。即D值 * @param datas * @return */ private static double getKSma(List<StickData> datas) { if (datas == null) return -1; double sum = 0; for (StickData data : datas) { sum += data.getK(); } return NumberUtil.doubleDecimal(sum / datas.size()); } }
8,滑动与缩放
这个就简单了,分时线不支持滑动和缩放,仅仅有k线须要:由于k线的数据较多。默认一屏展示不全。所以须要直接滑动,缩放的话。可能是想看大趋势吧(我猜的)!
方法就是直接通过手势监听滑动和缩放。
那么:我拿到600个数据,展示了500-600,滑动的时候。仅仅要吧这100个往前移动就能够了。如滑到450-550;缩放的话。就更简单了,假设一屏展示100。那你设置一屏展示80或120就是缩放了,是不是so easy!
9。十字线
好了,图画完了,须要十字线出来走两步了!
先看看我的布局吧
<RelativeLayout android:layout_width="0dp" android:layout_height="match_parent" android:layout_weight="686"> <eat.arvin.com.mychart.view.FenshiView android:id="@+id/cff_fenshiview" android:layout_width="match_parent" android:layout_height="match_parent" /> <eat.arvin.com.mychart.view.CrossView android:id="@+id/cff_cross" android:layout_width="match_parent" android:layout_height="match_parent" android:visibility="gone" /> </RelativeLayout>
懂了吧,这俩货是分开的。我仅仅要在fenshiView里面捕获单击事件。然后推断该点是否有数据,有的话在CrossView画线,对画两根线。欧了
@Override public boolean onSingleTapUp(final MotionEvent e) { //延时300毫秒显示,为双击腾出时间 new Handler().postDelayed(new Runnable() { @Override public void run() { //单击显示十字线 if(crossView != null) { if (crossView.getVisibility() == View.GONE) { onCrossMove(e.getX(), e.getY()); } } } }, DOUBLE_TAP_DELAY); return super.onSingleTapUp(e); }
crossView
public class CrossView extends View { /** * 十字线移动的监听 */ public interface OnMoveListener { /** * 十字线移动(回调到数据存放的位置,推断是否须要画线后,再调用本界面画线方法) * * @param x x轴坐标 * @param y y轴坐标 */ void onCrossMove(float x, float y); /** * 十字线消失的回调 */ void onDismiss(); } private CrossBean bean; //手势控制 private GestureDetector gestureDetector; private OnMoveListener onMoveListener; public CrossView(Context context, AttributeSet attrs) { super(context, attrs); gestureDetector = new GestureDetector(getContext(), new GestureDetector.SimpleOnGestureListener() { @Override public boolean onSingleTapUp(MotionEvent e) { //单击隐藏十字线 setVisibility(GONE); if (onMoveListener != null) onMoveListener.onDismiss(); return super.onSingleTapUp(e); } @Override public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX, float distanceY) { //滑动时,通知到接口 if (onMoveListener != null) { onMoveListener.onCrossMove(e2.getX(), e2.getY()); } return super.onScroll(e1, e2, distanceX, distanceY); } }); } @Override public boolean onTouchEvent(MotionEvent event) { if (gestureDetector != null) gestureDetector.onTouchEvent(event); return true; } @Override protected void onDraw(Canvas canvas) { super.onDraw(canvas); drawCrossLine(canvas); } /** * //依据x,y画十字线 * * @param canvas */ private void drawCrossLine(Canvas canvas) { //当该点没有数据的时候。不画 if (bean.x < 0 || bean.y < 0) return; boolean isJunXian = bean.y2 >= 0; Paint p = new Paint(); p.setAntiAlias(true); p.setColor(ColorUtil.COLOR_CROSS_LINE); p.setStrokeWidth(2f); p.setStyle(Paint.Style.FILL); //横线 canvas.drawLine(0, bean.y, getWidth(), bean.y, p); //竖线 canvas.drawLine(bean.x, 0, bean.x, getHeight(), p); if (isJunXian) { //均线的时候才画出圆点 //画十字线和均线价格线交汇的圆 canvas.drawCircle(bean.x, bean.y, 10, p); p.setColor(ColorUtil.COLOR_SMA_LINE); canvas.drawCircle(bean.x, bean.y2, 10, p); } p.setColor(Color.BLACK); p.setTextSize(32f); //1, 写价格(竖线靠左时,价格须要写到右边) drawPriceTextWithRect(canvas, bean.x, bean.y, bean.price, p); //2, 写时间 drawTimeTextWithRect(canvas, bean.x, bean.getTime(), p); //3,写指标的文字 drawIndexTexts(canvas); p.reset(); } private void drawIndexTexts(Canvas canvas) { if(bean.indexText == null || bean.indexColor == null) return; Paint p = new Paint(); p.setAntiAlias(true); p.setTextSize(26f); float x = 0; float y = getHeight() * (ChartConstant.MAIN_SCALE + ChartConstant.TIME_SCALE) + 25; for(int i = 0;i < bean.indexText.length; i++) { p.setColor(bean.indexColor[i]); canvas.drawText(bean.indexText[i], x, y, p); x += LineUtil.getTextWidth(p, bean.indexText[i]) + 30; } } /** * 写时间,而且带框 */ private void drawTimeTextWithRect(Canvas canvas, float x, String time, Paint p) { p.setTextAlign(Paint.Align.LEFT); float textWidth = LineUtil.getTextWidth(p, time) + 20; float y = getHeight() * ChartConstant.MAIN_SCALE; Paint rp = new Paint(); rp.setColor(Color.WHITE); rp.setStyle(Paint.Style.FILL); rp.setStrokeWidth(2f); //1,先画白底 float startX = x - textWidth / 2; float endX = x + textWidth / 2; if(startX < 0) { startX = 2f; endX = startX + textWidth; } if(endX > getWidth()) { endX = getWidth() - 2; startX = endX - textWidth; } canvas.drawRect(startX, y + 2, endX, y + 30, rp); rp.setColor(Color.BLACK); rp.setStyle(Paint.Style.STROKE); //2,再画黑框 canvas.drawRect(startX, y + 2, endX, y + 30, rp); //3。写文字 canvas.drawText(time, startX + 10, y + 27.5f, p); } /** * 写文字,而且为文字带上背景。等于在文字后方画上一个Rect */ private void drawPriceTextWithRect(Canvas canvas, float x, float y, String text, Paint p) { float textWidth = LineUtil.getTextWidth(p, text) + 10; Paint rp = new Paint(); rp.setColor(Color.WHITE); rp.setStyle(Paint.Style.FILL); rp.setStrokeWidth(2f); float startY = y - 15f; float endY = y + 15f; if(startY < 0) { startY = 0f; endY = startY + 30f; } else if(endY > getHeight()) { endY = getHeight(); startY = endY - 30f; } if (x < 100) { //X轴在左側,该框画在右側 //1,先画白底 canvas.drawRect(getWidth() - textWidth, startY, getWidth(), endY, rp); rp.setColor(Color.BLACK); rp.setStyle(Paint.Style.STROKE); //2,再画黑框 canvas.drawRect(getWidth() - textWidth, startY, getWidth(), endY, rp); p.setTextAlign(Paint.Align.RIGHT); canvas.drawText(text, getWidth() - 5f, endY - 3, p); } else { //X轴在右側。改框画左側 canvas.drawRect(0, startY, textWidth, endY, rp); rp.setColor(Color.BLACK); rp.setStyle(Paint.Style.STROKE); canvas.drawRect(0, startY, textWidth, endY, rp); p.setTextAlign(Paint.Align.LEFT); canvas.drawText(text, 5f, endY - 3, p); } } /** * 画分时线的十字线 */ public void drawLine(CrossBean bean) { this.bean = bean; postInvalidate(); } /** * 设置移动监听 * * @param onMoveListener */ public void setOnMoveListener(OnMoveListener onMoveListener) { this.onMoveListener = onMoveListener; } }
10。一些优化
分时线:server仅仅须要返回变化的点,不须要所有返回,这些缺失的点直接使用前一分钟补全
K线:因为k线数据巨多,所以假设在server计算好指标再返回client的话。会使数据量*1.5差点儿相同。所以这些指标还是在本地算好了,仅仅须要算须要显示的。且不须要反复计算
11。github
https://github.com/xuzhou4520/AChart1
posted on 2017-08-17 10:51 yjbjingcha 阅读(1483) 评论(0) 编辑 收藏 举报