//第一步 写个ChartView类继承View：
public class ChartView extends View {
//xy坐标轴颜色
private int xylinecolor = 0xffe2e2e2;
//xy坐标轴宽度
private int xylinewidth = dpToPx(1);
//xy坐标轴文字颜色
private int xytextcolor = 0xff7e7e7e;
//xy坐标轴文字大小
private int xytextsize = spToPx(12);
//折线图中折线的颜色
private int linecolor = 0xff02bbb7;
//x轴各个坐标点水平间距
private int interval = dpToPx(50);
//背景颜色
private int bgcolor = 0xffffffff;
//是否在ACTION_UP时，根据速度进行自滑动，没有要求，建议关闭，过于占用GPU
private boolean isScroll = false;
//绘制XY轴坐标对应的画笔
private Paint xyPaint;
//绘制XY轴的文本对应的画笔
private Paint xyTextPaint;
//画折线对应的画笔
private Paint linePaint;
private int width;
private int height;
//x轴的原点坐标
private int xOri;
//y轴的原点坐标
private int yOri;
//第一个点X的坐标
private float xInit;
//第一个点对应的最大Y坐标
private float maxXInit;
//第一个点对应的最小X坐标
private float minXInit;
//x轴坐标对应的数据
private List<String> xValue = new ArrayList<>();
//y轴坐标对应的数据
private List<Integer> yValue = new ArrayList<>();
//折线对应的数据
private Map<String, Integer> value = new HashMap<>();
//点击的点对应的X轴的第几个点，默认1
private int selectIndex = 1;
//X轴刻度文本对应的最大矩形，为了选中时，在x轴文本画的框框大小一致
private Rect xValueRect;
//速度检测器
private VelocityTracker velocityTracker;
public ChartView(Context context) {
this(context, null);
}
public ChartView(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}
public ChartView(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
init(context, attrs, defStyleAttr);
initPaint();
}
/**
* 初始化畫筆
*/
private void initPaint() {
xyPaint = new Paint();
xyPaint.setAntiAlias(true);
xyPaint.setStrokeWidth(xylinewidth);
xyPaint.setStrokeCap(Paint.Cap.ROUND);
xyPaint.setColor(xylinecolor);
xyTextPaint = new Paint();
xyTextPaint.setAntiAlias(true);
xyTextPaint.setTextSize(xytextsize);
xyTextPaint.setStrokeCap(Paint.Cap.ROUND);
xyTextPaint.setColor(xytextcolor);
xyTextPaint.setStyle(Paint.Style.STROKE);
linePaint = new Paint();
linePaint.setAntiAlias(true);
linePaint.setStrokeWidth(xylinewidth);
linePaint.setStrokeCap(Paint.Cap.ROUND);
linePaint.setColor(linecolor);
linePaint.setStyle(Paint.Style.STROKE);
}
/**
* 初始化
*
* @param context
* @param attrs
* @param defStyleAttr
*/
private void init(Context context, AttributeSet attrs, int defStyleAttr) {
TypedArray array = context.obtainStyledAttributes(attrs, R.styleable.chartView, defStyleAttr, 0);
int count = array.getIndexCount();
for (int i = 0; i < count; i++) {
int attr = array.getIndex(i);
switch (attr) {
case R.styleable.chartView_xylinecolor://xy坐标轴颜色
xylinecolor = array.getColor(attr, xylinecolor);
break;
case R.styleable.chartView_xylinewidth://xy坐标轴宽度
xylinewidth = (int) array.getDimension(attr, TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_PX, xylinewidth, getResources().getDisplayMetrics()));
break;
case R.styleable.chartView_xytextcolor://xy坐标轴文字颜色
xytextcolor = array.getColor(attr, xytextcolor);
break;
case R.styleable.chartView_xytextsize://xy坐标轴文字大小
xytextsize = (int) array.getDimension(attr, TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_PX, xytextsize, getResources().getDisplayMetrics()));
break;
case R.styleable.chartView_linecolor://折线图中折线的颜色
linecolor = array.getColor(attr, linecolor);
break;
case R.styleable.chartView_interval://x轴各个坐标点水平间距
interval = (int) array.getDimension(attr, TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_PX, interval, getResources().getDisplayMetrics()));
break;
case R.styleable.chartView_bgcolor: //背景颜色
bgcolor = array.getColor(attr, bgcolor);
break;
case R.styleable.chartView_isScroll://是否在ACTION_UP时，根据速度进行自滑动
isScroll = array.getBoolean(attr, isScroll);
break;
}
}
array.recycle();
}
@Override
protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
if (changed) {
//这里需要确定几个基本点，只有确定了xy轴原点坐标，第一个点的X坐标值及其最大最小值
width = getWidth();
height = getHeight();
//Y轴文本最大宽度
float textYWdith = getTextBounds("000", xyTextPaint).width();
for (int i = 0; i < yValue.size(); i++) {//求取y轴文本最大的宽度
float temp = getTextBounds(yValue.get(i) + "", xyTextPaint).width();
if (temp > textYWdith)
textYWdith = temp;
}
int dp2 = dpToPx(2);
int dp3 = dpToPx(3);
xOri = (int) (dp2 + textYWdith + dp2 + xylinewidth);//dp2是y轴文本距离左边，以及距离y轴的距离
// //X轴文本最大高度
xValueRect = getTextBounds("000", xyTextPaint);
float textXHeight = xValueRect.height();
for (int i = 0; i < xValue.size(); i++) {//求取x轴文本最大的高度
Rect rect = getTextBounds(xValue.get(i) + "", xyTextPaint);
if (rect.height() > textXHeight)
textXHeight = rect.height();
if (rect.width() > xValueRect.width())
xValueRect = rect;
}
yOri = (int) (height - dp2 - textXHeight - dp3 - xylinewidth);//dp3是x轴文本距离底边，dp2是x轴文本距离x轴的距离
xInit = interval + xOri;
minXInit = width - (width - xOri) * 0.1f - interval * (xValue.size() - 1);//减去0.1f是因为最后一个X周刻度距离右边的长度为X轴可见长度的10%
maxXInit = xInit;
}
super.onLayout(changed, left, top, right, bottom);
}
@Override
protected void onDraw(Canvas canvas) {
// super.onDraw(canvas);
canvas.drawColor(bgcolor);
drawXY(canvas);
drawBrokenLineAndPoint(canvas);
}
/**
* 绘制折线和折线交点处对应的点
*
* @param canvas
*/
private void drawBrokenLineAndPoint(Canvas canvas) {
if (xValue.size() <= 0)
return;
//重新开一个图层
int layerId = canvas.saveLayer(0, 0, width, height, null, Canvas.ALL_SAVE_FLAG);
drawBrokenLine(canvas);
drawBrokenPoint(canvas);
// 将折线超出x轴坐标的部分截取掉
linePaint.setStyle(Paint.Style.FILL);
linePaint.setColor(bgcolor);
linePaint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.CLEAR));
RectF rectF = new RectF(0, 0, xOri, height);
canvas.drawRect(rectF, linePaint);
linePaint.setXfermode(null);
//保存图层
canvas.restoreToCount(layerId);
}
/**
* 绘制折线对应的点
*
* @param canvas
*/
private void drawBrokenPoint(Canvas canvas) {
float dp2 = dpToPx(2);
float dp4 = dpToPx(4);
float dp7 = dpToPx(7);
//绘制节点对应的原点
for (int i = 0; i < xValue.size(); i++) {
float x = xInit + interval * i;
float y = yOri - yOri * (1 - 0.1f) * value.get(xValue.get(i)) / yValue.get(yValue.size() - 1);
//绘制选中的点
if (i == selectIndex - 1) {
linePaint.setStyle(Paint.Style.FILL);
linePaint.setColor(0xffd0f3f2);
canvas.drawCircle(x, y, dp7, linePaint);
linePaint.setColor(0xff81dddb);
canvas.drawCircle(x, y, dp4, linePaint);
drawFloatTextBox(canvas, x, y - dp7, value.get(xValue.get(i)));
}
//绘制普通的节点
linePaint.setStyle(Paint.Style.FILL);
linePaint.setColor(Color.WHITE);
canvas.drawCircle(x, y, dp2, linePaint);
linePaint.setStyle(Paint.Style.STROKE);
linePaint.setColor(linecolor);
canvas.drawCircle(x, y, dp2, linePaint);
}
}
/**
* 绘制显示Y值的浮动框
*
* @param canvas
* @param x
* @param y
* @param text
*/
private void drawFloatTextBox(Canvas canvas, float x, float y, int text) {
int dp6 = dpToPx(6);
int dp18 = dpToPx(18);
//p1
Path path = new Path();
path.moveTo(x, y);
//p2
path.lineTo(x - dp6, y - dp6);
//p3
path.lineTo(x - dp18, y - dp6);
//p4
path.lineTo(x - dp18, y - dp6 - dp18);
//p5
path.lineTo(x + dp18, y - dp6 - dp18);
//p6
path.lineTo(x + dp18, y - dp6);
//p7
path.lineTo(x + dp6, y - dp6);
//p1
path.lineTo(x, y);
canvas.drawPath(path, linePaint);
linePaint.setColor(Color.WHITE);
linePaint.setTextSize(spToPx(14));
Rect rect = getTextBounds(text + "", linePaint);
canvas.drawText(text + "", x - rect.width() / 2, y - dp6 - (dp18 - rect.height()) / 2, linePaint);
}
/**
* 绘制折线
*
* @param canvas
*/
private void drawBrokenLine(Canvas canvas) {
linePaint.setStyle(Paint.Style.STROKE);
linePaint.setColor(linecolor);
//绘制折线
Path path = new Path();
float x = xInit + interval * 0;
float y = yOri - yOri * (1 - 0.1f) * value.get(xValue.get(0)) / yValue.get(yValue.size() - 1);
path.moveTo(x, y);
for (int i = 1; i < xValue.size(); i++) {
x = xInit + interval * i;
y = yOri - yOri * (1 - 0.1f) * value.get(xValue.get(i)) / yValue.get(yValue.size() - 1);
path.lineTo(x, y);
}
canvas.drawPath(path, linePaint);
}
/**
* 绘制XY坐标
*
* @param canvas
*/
private void drawXY(Canvas canvas) {
int length = dpToPx(4);//刻度的长度
//绘制Y坐标
canvas.drawLine(xOri - xylinewidth / 2, 0, xOri - xylinewidth / 2, yOri, xyPaint);
//绘制y轴箭头
xyPaint.setStyle(Paint.Style.STROKE);
Path path = new Path();
path.moveTo(xOri - xylinewidth / 2 - dpToPx(5), dpToPx(12));
path.lineTo(xOri - xylinewidth / 2, xylinewidth / 2);
path.lineTo(xOri - xylinewidth / 2 + dpToPx(5), dpToPx(12));
canvas.drawPath(path, xyPaint);
//绘制y轴刻度
int yLength = (int) (yOri * (1 - 0.1f) / (yValue.size() - 1));//y轴上面空出10%,计算出y轴刻度间距
for (int i = 0; i < yValue.size(); i++) {
//绘制Y轴刻度
//这里可以设置成这个Y轴刻度，和屏幕一样宽的效果：
// canvas.drawLine(xOri, yOri - yLength * i + xylinewidth / 2, xOri+width, yOri - yLength * i + xylinewidth / 2, xyPaint);
canvas.drawLine(xOri, yOri - yLength * i + xylinewidth / 2, xOri + length, yOri - yLength * i + xylinewidth / 2, xyPaint);
xyTextPaint.setColor(xytextcolor);
//绘制Y轴文本
String text = yValue.get(i) + "";
Rect rect = getTextBounds(text, xyTextPaint);
canvas.drawText(text, 0, text.length(), xOri - xylinewidth - dpToPx(2) - rect.width(), yOri - yLength * i + rect.height() / 2, xyTextPaint);
}
//绘制X轴坐标
canvas.drawLine(xOri, yOri + xylinewidth / 2, width, yOri + xylinewidth / 2, xyPaint);
//绘制x轴箭头
xyPaint.setStyle(Paint.Style.STROKE);
path = new Path();
//整个X轴的长度
float xLength = xInit + interval * (xValue.size() - 1) + (width - xOri) * 0.1f;
if (xLength < width)
xLength = width;
path.moveTo(xLength - dpToPx(12), yOri + xylinewidth / 2 - dpToPx(5));
path.lineTo(xLength - xylinewidth / 2, yOri + xylinewidth / 2);
path.lineTo(xLength - dpToPx(12), yOri + xylinewidth / 2 + dpToPx(5));
canvas.drawPath(path, xyPaint);
//绘制x轴刻度
for (int i = 0; i < xValue.size(); i++) {
float x = xInit + interval * i;
if (x >= xOri) {//只绘制从原点开始的区域
xyTextPaint.setColor(xytextcolor);
canvas.drawLine(x, yOri, x, yOri - length, xyPaint);
//绘制X轴文本
String text = xValue.get(i);
Rect rect = getTextBounds(text, xyTextPaint);
if (i == selectIndex - 1) {
xyTextPaint.setColor(linecolor);
canvas.drawText(text, 0, text.length(), x - rect.width() / 2, yOri + xylinewidth + dpToPx(2) + rect.height(), xyTextPaint);
canvas.drawRoundRect(x - xValueRect.width() / 2 - dpToPx(3), yOri + xylinewidth + dpToPx(1), x + xValueRect.width() / 2 + dpToPx(3), yOri + xylinewidth + dpToPx(2) + xValueRect.height() + dpToPx(2), dpToPx(2), dpToPx(2), xyTextPaint);
} else {
canvas.drawText(text, 0, text.length(), x - rect.width() / 2, yOri + xylinewidth + dpToPx(2) + rect.height(), xyTextPaint);
}
}
}
}
private float startX;
@Override
public boolean onTouchEvent(MotionEvent event) {
if (isScrolling)
return super.onTouchEvent(event);
this.getParent().requestDisallowInterceptTouchEvent(true);//当该view获得点击事件，就请求父控件不拦截事件
obtainVelocityTracker(event);
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
startX = event.getX();
break;
case MotionEvent.ACTION_MOVE:
if (interval * xValue.size() > width - xOri) {//当期的宽度不足以呈现全部数据
float dis = event.getX() - startX;
startX = event.getX();
if (xInit + dis < minXInit) {
xInit = minXInit;
} else if (xInit + dis > maxXInit) {
xInit = maxXInit;
} else {
xInit = xInit + dis;
}
invalidate();
}
break;
case MotionEvent.ACTION_UP:
clickAction(event);
scrollAfterActionUp();
this.getParent().requestDisallowInterceptTouchEvent(false);
recycleVelocityTracker();
break;
case MotionEvent.ACTION_CANCEL:
this.getParent().requestDisallowInterceptTouchEvent(false);
recycleVelocityTracker();
break;
}
return true;
}
//是否正在滑动
private boolean isScrolling = false;
/**
* 手指抬起后的滑动处理
*/
private void scrollAfterActionUp() {
if (!isScroll)
return;
final float velocity = getVelocity();
float scrollLength = maxXInit - minXInit;
if (Math.abs(velocity) < 10000)//10000是一个速度临界值，如果速度达到10000，最大可以滑动(maxXInit - minXInit)
scrollLength = (maxXInit - minXInit) * Math.abs(velocity) / 10000;
ValueAnimator animator = ValueAnimator.ofFloat(0, scrollLength);
animator.setDuration((long) (scrollLength / (maxXInit - minXInit) * 1000));//时间最大为1000毫秒，此处使用比例进行换算
animator.setInterpolator(new DecelerateInterpolator());
animator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
@Override
public void onAnimationUpdate(ValueAnimator valueAnimator) {
float value = (float) valueAnimator.getAnimatedValue();
if (velocity < 0 && xInit > minXInit) {//向左滑动
if (xInit - value <= minXInit)
xInit = minXInit;
else
xInit = xInit - value;
} else if (velocity > 0 && xInit < maxXInit) {//向右滑动
if (xInit + value >= maxXInit)
xInit = maxXInit;
else
xInit = xInit + value;
}
invalidate();
}
});
animator.addListener(new Animator.AnimatorListener() {
@Override
public void onAnimationStart(Animator animator) {
isScrolling = true;
}
@Override
public void onAnimationEnd(Animator animator) {
isScrolling = false;
}
@Override
public void onAnimationCancel(Animator animator) {
isScrolling = false;
}
@Override
public void onAnimationRepeat(Animator animator) {
}
});
animator.start();
}
/**
* 获取速度
*
* @return
*/
private float getVelocity() {
if (velocityTracker != null) {
velocityTracker.computeCurrentVelocity(1000);
return velocityTracker.getXVelocity();
}
return 0;
}
/**
* 点击X轴坐标或者折线节点
*
* @param event
*/
private void clickAction(MotionEvent event) {
int dp8 = dpToPx(8);
float eventX = event.getX();
float eventY = event.getY();
for (int i = 0; i < xValue.size(); i++) {
//节点
float x = xInit + interval * i;
float y = yOri - yOri * (1 - 0.1f) * value.get(xValue.get(i)) / yValue.get(yValue.size() - 1);
if (eventX >= x - dp8 && eventX <= x + dp8 &&
eventY >= y - dp8 && eventY <= y + dp8 && selectIndex != i + 1) {//每个节点周围8dp都是可点击区域
selectIndex = i + 1;
invalidate();
return;
}
//X轴刻度
String text = xValue.get(i);
Rect rect = getTextBounds(text, xyTextPaint);
x = xInit + interval * i;
y = yOri + xylinewidth + dpToPx(2);
if (eventX >= x - rect.width() / 2 - dp8 && eventX <= x + rect.width() + dp8 / 2 &&
eventY >= y - dp8 && eventY <= y + rect.height() + dp8 && selectIndex != i + 1) {
selectIndex = i + 1;
invalidate();
return;
}
}
}
/**
* 获取速度跟踪器
*
* @param event
*/
private void obtainVelocityTracker(MotionEvent event) {
if (!isScroll)
return;
if (velocityTracker == null) {
velocityTracker = VelocityTracker.obtain();
}
velocityTracker.addMovement(event);
}
/**
* 回收速度跟踪器
*/
private void recycleVelocityTracker() {
if (velocityTracker != null) {
velocityTracker.recycle();
velocityTracker = null;
}
}
public int getSelectIndex() {
return selectIndex;
}
public void setSelectIndex(int selectIndex) {
this.selectIndex = selectIndex;
invalidate();
}
public void setxValue(List<String> xValue) {
this.xValue = xValue;
}
public void setyValue(List<Integer> yValue) {
this.yValue = yValue;
invalidate();
}
public void setValue(Map<String, Integer> value) {
this.value = value;
invalidate();
}
public void setValue(Map<String, Integer> value, List<String> xValue, List<Integer> yValue) {
this.value = value;
this.xValue = xValue;
this.yValue = yValue;
invalidate();
}
public List<String> getxValue() {
return xValue;
}
public List<Integer> getyValue() {
return yValue;
}
public Map<String, Integer> getValue() {
return value;
}
/**
* 获取丈量文本的矩形
*
* @param text
* @param paint
* @return
*/
private Rect getTextBounds(String text, Paint paint) {
Rect rect = new Rect();
paint.getTextBounds(text, 0, text.length(), rect);
return rect;
}
/**
* dp转化成为px
*
* @param dp
* @return
*/
private int dpToPx(int dp) {
float density = getContext().getResources().getDisplayMetrics().density;
return (int) (dp * density + 0.5f * (dp >= 0 ? 1 : -1));
}
/**
* sp转化为px
*
* @param sp
* @return
*/
private int spToPx(int sp) {
float scaledDensity = getContext().getResources().getDisplayMetrics().scaledDensity;
return (int) (scaledDensity * sp + 0.5f * (sp >= 0 ? 1 : -1));
}
}
//第二步：在values下写个attrs.xml文件：
<?xml version="1.0" encoding="utf-8"?>
<resources>
<!-- xy坐标轴颜色 -->
<attr name="xylinecolor" format="color" />
<!-- xy坐标轴宽度 -->
<attr name="xylinewidth" format="dimension" />
<!-- xy坐标轴文字颜色 -->
<attr name="xytextcolor" format="color" />
<!-- xy坐标轴文字大小 -->
<attr name="xytextsize" format="dimension" />
<!-- 折线图中折线的颜色 -->
<attr name="linecolor" format="color" />
<!-- x轴各个坐标点水平间距 -->
<attr name="interval" format="dimension" />
<!-- 背景颜色 -->
<attr name="bgcolor" format="color" />
<!--是否在ACTION_UP时，根据速度进行自滑动，建议关闭，过于占用GPU-->
<attr name="isScroll" format="boolean" />
<declare-styleable name="chartView">
<attr name="xylinecolor" />
<attr name="xylinewidth" />
<attr name="xytextcolor" />
<attr name="xytextsize" />
<attr name="linecolor" />
<attr name="interval" />
<attr name="bgcolor" />
<attr name="isScroll" />
</declare-styleable>
</resources>//第三步在Activity里使用：
public class MainActivity extends AppCompatActivity {
//x轴坐标对应的数据
private List<String> xValue = new ArrayList<>();
//y轴坐标对应的数据
private List<Integer> yValue = new ArrayList<>();
//折线对应的数据
private Map<String, Integer> value = new HashMap<>();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//获取当前月份
Time t = new Time();
t.setToNow();
int year = t.year;
int month = t.month + 1;
//获取当前月的天数
int currentMonthDay = getCurrentMonthDay();
Log.e("TAG2", currentMonthDay + "");
//数据集合
List<Integer> mList = new ArrayList<>();
mList.add(1);
mList.add(10);
mList.add(10);
mList.add(9);
mList.add(7);
mList.add(35);
mList.add(28);
// (int) (Math.random() * 181 + 60)
for (int i = 0; i < 7; i++) {
xValue.add(month + "." + (i + 1));
value.put(month + "." + (i + 1), mList.get(i));
}
//集合最大值
Integer max = Collections.max(mList);
//集合最小值
Integer min = Collections.min(mList);
yValue.add(0);//y轴坐标最小数
yValue.add(max / 2);//y轴坐标最大数/2
yValue.add(max);//y轴坐标最大数
ChartView chartView = (ChartView) findViewById(R.id.chartview);
//折线图设置数据
chartView.setValue(value, xValue, yValue);
}
//获取当月的 天数
public int getCurrentMonthDay() {
Calendar a = Calendar.getInstance();
a.set(Calendar.DATE, 1);
a.roll(Calendar.DATE, -1);
int maxDate = a.get(Calendar.DATE);
return maxDate;
}
}//我的布局：
<com.example.hasee.a1029ceshi.ChartView
android:id="@+id/chartview"
android:layout_width="match_parent"
android:layout_height="300dp"
android:layout_centerInParent="true"
app:bgcolor="#ffffff"
app:interval="40dp"
app:isScroll="false"
app:linecolor="#02bbb7"
app:xylinecolor="#e2e2e2"
app:xylinewidth="2dp"
app:xytextcolor="#7e7e7e"
app:xytextsize="15sp"
/>
//---------------------------------------------------------------------完-----------------------------------------------------------------------------------------