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