Android开发 - 实时心率控件图

graph LR
心率数据-->心率仓库
心率仓库-->根据采样率获取心率数据
根据采样率获取心率数据--> 打印数据

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <declare-styleable name="HeartView">
        <!--心电线的宽度-->
        <attr name="heart_line_border" format="dimension" />
        <!--每个表格的行数（就是小格子数）-->
        <attr name="heart_grid_row" format="integer" />
        <!--大表格的边框的宽度-->
        <attr name="heart_grid_border" format="dimension" />
        <!--每个小格子的宽高-->
        <attr name="heart_grid_row_height" format="dimension" />
        <!--每个小格子的线的宽度-->
        <attr name="heart_grid_line_border" format="dimension" />
        <!--基准线-->
        <attr name="heart_base_line" format="integer" />
        <!--最大值-->
        <attr name="heart_max" format="integer" />
        <!--最小值-->
        <attr name="heart_min" format="integer" />
        <!--数据采集频率-->
        <attr name="heart_hz" format="integer" />
        <!--一个控件，可以显示的心率的时长-->
        <attr name="heart_show_seconds" format="integer" />
        <!--心率线条的颜色-->
        <attr name="heart_color" format="color" />
        <!--表格线条的颜色-->
        <attr name="heart_grid_line_color" format="color" />
        <!--表格边框的颜色-->
        <attr name="heart_grid_border_color" format="color" />
        <!--控制播放速度的调整 值越小，播放速度越慢 -->
        <attr name="heart_speed" format="float" />
    </declare-styleable>
</resources>

import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Path;
import android.util.AttributeSet;
import android.util.Log;
import android.view.View;

import androidx.annotation.ColorInt;
import androidx.annotation.FloatRange;

import com.xiaolei.testproject.R;

import java.util.concurrent.LinkedBlockingDeque;

/**
 * 显示心电的控件
 */
public class HeartView extends View implements Runnable
{
    // 数据的最大值
    private int Max;
    // 数据的最小值
    private int Min;
    // 数据一秒钟采集频率，默认100个点一秒种
    private int hz;
    // 控件显示几秒钟的心跳,默认显示2秒钟的心跳
    private int showSeconds;
    // 要画的基准线
    private int baseLine;
    // 每个方格的行数
    private int grid_row;
    // 每个方格的高度
    private int grid_row_height;
    // 心率线条的颜色 默认红色
    private int heartColor;
    // 表格线条的颜色 默认灰色
    private int heart_grid_line_color;
    // 表格边框的颜色 默认灰色
    private int heart_grid_border_color;
    // 心电线的宽度
    private int heart_line_border;
    // 大表格的边框的宽度
    private int heart_grid_border;
    // 每个小格子的线的宽度
    private int heart_grid_line_border;
    // 速度控制
    private float heart_speed;

    private int viewHeight = 0;
    private int viewWidth = 0;

    // 画笔
    private Paint paint;
    // 需要画心电的路径
    private Path path = new Path();
    // 根据显示秒数,以及采样频率算出总共需要申请多少个内存的数据
    private int[] showTimeDatas;
    // 待显示的数据队列
    private LinkedBlockingDeque<Integer> dataQueue = new LinkedBlockingDeque<>();
    // 队列循环使用的
    private boolean loop = true;

    public HeartView(Context context)
    {
        this(context, null);
    }

    public HeartView(Context context, AttributeSet attrs)
    {
        this(context, attrs, 0);
    }

    public HeartView(Context context, AttributeSet attrs, int defStyleAttr)
    {
        super(context, attrs, defStyleAttr);
        paint = new Paint();
        paint.setStyle(Paint.Style.STROKE);
        paint.setAntiAlias(true);
        paint.setColor(Color.RED);

        TypedArray typedArray = context.obtainStyledAttributes(attrs, R.styleable.HeartView);
        // 心电线的宽度
        heart_line_border = typedArray.getDimensionPixelSize(R.styleable.HeartView_heart_line_border, (int) dip2px(context, 1f));
        // 每个表格的行数（就是小格子数,默认5格
        grid_row = typedArray.getInt(R.styleable.HeartView_heart_grid_row, 5);
        // 大表格的边框的宽度
        heart_grid_border = typedArray.getDimensionPixelSize(R.styleable.HeartView_heart_grid_border, (int) dip2px(context, 2f));
        // 每个小格子的宽高
        grid_row_height = typedArray.getDimensionPixelSize(R.styleable.HeartView_heart_grid_row_height, (int) dip2px(context, 10f));
        // 每个小格子的线的宽度
        heart_grid_line_border = typedArray.getDimensionPixelSize(R.styleable.HeartView_heart_grid_line_border, (int) dip2px(context, 1f));
        // 基准线，默认2000
        baseLine = typedArray.getInteger(R.styleable.HeartView_heart_base_line, 2000);
        // 最大值，默认4000
        Max = typedArray.getInteger(R.styleable.HeartView_heart_max, 4096);
        // 最小值，默认0
        Min = typedArray.getInteger(R.styleable.HeartView_heart_min, 0);
        // 数据采集频率，默认100个点一秒钟
        hz = typedArray.getInteger(R.styleable.HeartView_heart_hz, 100);
        // 一个控件，可以显示的心率的时长 ,默认为2秒钟
        showSeconds = typedArray.getInteger(R.styleable.HeartView_heart_show_seconds, 2);
        // 心率线条的颜色 默认红色
        heartColor = typedArray.getColor(R.styleable.HeartView_heart_color, Color.RED);
        // 表格线条的颜色 默认绿色
        heart_grid_line_color = typedArray.getColor(R.styleable.HeartView_heart_grid_line_color, Color.parseColor("#DBDBDB"));
        // 表格边框的颜色 默认绿色
        heart_grid_border_color = typedArray.getColor(R.styleable.HeartView_heart_grid_border_color, Color.parseColor("#DBDBDB"));
        // 播放速度的控制
        heart_speed = typedArray.getFloat(R.styleable.HeartView_heart_speed, 1.0f);
        typedArray.recycle();

        // 速度怎么可以小于0
        if (heart_speed < 0)
        {
            throw new RuntimeException("Attributes heart_speed Can Not < 0 ");
        }
        // 最小值怎么可以大于或等于最大值
        if (Min >= Max)
        {
            throw new RuntimeException("Attributes heart_min Can Not >= heart_max ");
        }

        showTimeDatas = new int[showSeconds * hz];

        new Thread(this).start();
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec)
    {
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
        viewHeight = measureHeight(heightMeasureSpec);
        viewWidth = measureWidth(widthMeasureSpec);
        path.moveTo(0, viewHeight);
    }

    /**
     * 设置表格的行数
     *
     * @param grid_row
     */
    public void setGrid_row(int grid_row)
    {
        this.grid_row = grid_row;
    }

    /**
     * 设置每个小方格的高度
     *
     * @param height
     */
    public void setGrid_row_height(int height)
    {
        this.grid_row_height = height;
    }

    /**
     * 设置线条颜色
     *
     * @param color
     */
    public void setHeartColor(@ColorInt int color)
    {
        this.heartColor = color;
    }

    /**
     * 设置画小表格的颜色
     *
     * @param color
     */
    public void setHeartGridLineColor(@ColorInt int color)
    {
        this.heart_grid_line_color = color;
    }

    /**
     * 设置大表格边框颜色
     *
     * @param color
     */
    public void setHeartGridBorderColor(@ColorInt int color)
    {
        this.heart_grid_border_color = color;
    }

    /**
     * 设置线条宽度
     *
     * @param border
     */
    public void setHeartLineBorder(@ColorInt int border)
    {
        this.heart_line_border = border;
    }

    /**
     * 设置大格边框线宽
     *
     * @param border
     */
    public void setHeartGridBorder(int border)
    {
        this.heart_grid_border = border;
    }

    /**
     * 设置小格线宽
     *
     * @param border
     */
    public void setHeartGridLineBorder(int border)
    {
        this.heart_grid_line_border = border;
    }

    /**
     * 设置倍速
     *
     * @param speed
     */
    public void setHeartSpeed(@FloatRange(from = 0.0, to = Float.MAX_VALUE) float speed)
    {
        this.heart_speed = speed;
        // 速度怎么可以小于0
        if (heart_speed < 0)
        {
            throw new RuntimeException("Attributes heart_speed Can Not < 0 ");
        }
    }

    /**
     * 添加一个点，会自动依据频率来动态显示
     *
     * @param point
     */
    public void offer(int point)
    {
        dataQueue.offer(point);
    }

    /**
     * 添加一组点，自动依据频率来动态显示
     *
     * @param points
     */
    public void offer(int[] points)
    {
        for (int i = 0; i < points.length; i++)
            offer(points[i]);
    }

    /**
     * 设置显示死数据，没有动态走动效果
     */
    public synchronized void setData(int[] points)
    {
        // 如果传过来的数据 比要显示的短，那么先根据数据长度替换，再将尾巴数据清空
        // 传递数据:[5，6]
        // 显示数据:[1,1,1]
        // 替换数据:[5,6,1]
        // 尾巴清空:[5,6,0]
        if (points.length <= showTimeDatas.length)
        {
            System.arraycopy(points, 0, showTimeDatas, 0, points.length);
            for (int i = points.length; i < showTimeDatas.length; i++)
            {
                showTimeDatas[i] = 0;
            }
        } else
        {
            // 如果传过来的数据，比显示的要长，那么以显示的长度为依据进行数据替换
            // 传递数据:[5,6,7]
            // 显示数据:[1,2]
            // 替换数据:[5,6]
            System.arraycopy(points, 0, showTimeDatas, 0, showTimeDatas.length);
        }
        postInvalidate();
    }

    /**
     * 设置每秒的采集频率
     *
     * @param hz
     */
    public synchronized void setHz(int hz)
    {
        this.hz = hz;
        this.showTimeDatas = new int[showSeconds * hz];
    }

    /**
     * 设置最大值
     *
     * @param max
     */
    public synchronized void setMax(int max)
    {
        this.Max = max;
        // 最小值怎么可以大于或等于最大值
        if (Min >= Max)
        {
            throw new RuntimeException("Attributes heart_min Can Not >= heart_max ");
        }
    }

    /**
     * 设置最小值
     *
     * @param min
     */
    public void setMin(int min)
    {
        Min = min;
        // 最小值怎么可以大于或等于最大值
        if (Min >= Max)
        {
            throw new RuntimeException("Attributes heart_min Can Not >= heart_max ");
        }
    }

    /**
     * 设置控件显示几秒钟的数据
     *
     * @param showSeconds
     */
    public synchronized void setShowSeconds(int showSeconds)
    {
        this.showSeconds = showSeconds;
        this.showTimeDatas = new int[showSeconds * hz];
    }

    /**
     * 清空图案
     */
    public synchronized void clear()
    {
        for (int i = 0; i < showTimeDatas.length; i++)
            showTimeDatas[i] = 0;
        postInvalidate();
    }

    /**
     * 设置基准线
     *
     * @param baseLine
     */
    public void setBaseLine(int baseLine)
    {
        this.baseLine = baseLine;
    }

    @Override
    protected void onDraw(Canvas canvas)
    {
        super.onDraw(canvas);
        int[] showDatas = showTimeDatas;
        // 画表格
        int baseY = calculateY(baseLine - Min, Max - Min, viewHeight);
        // 基准线以上
        for (int y = baseY; y > 0; y -= grid_row_height)
        {
            if ((baseY - y) / grid_row_height % grid_row == 0)
            {
                paint.setStrokeWidth(heart_grid_border);
                paint.setColor(heart_grid_border_color);
            } else
            {
                paint.setStrokeWidth(heart_grid_line_border);
                paint.setColor(heart_grid_line_color);
            }
            canvas.drawLine(0, y, viewWidth, y, paint);
        }
        // 基准线以下
        for (int y = baseY; y < viewHeight; y += grid_row_height)
        {
            if ((y - baseY) / grid_row_height % grid_row == 0)
            {
                paint.setStrokeWidth(heart_grid_border);
                paint.setColor(heart_grid_border_color);
            } else
            {
                paint.setStrokeWidth(heart_grid_line_border);
                paint.setColor(heart_grid_line_color);
            }
            canvas.drawLine(0, y, viewWidth, y, paint);
        }
        // 中心线以右
        int centerX = viewWidth / 2;
        for (int x = centerX; x < viewWidth; x += grid_row_height)
        {
            if ((x - centerX) / grid_row_height % grid_row == 0)
            {
                paint.setStrokeWidth(heart_grid_border);
                paint.setColor(heart_grid_border_color);
            } else
            {
                paint.setStrokeWidth(heart_grid_line_border);
                paint.setColor(heart_grid_line_color);
            }
            canvas.drawLine(x, 0, x, viewHeight, paint);
        }
        // 中心线以左
        for (int x = centerX; x > 0; x -= grid_row_height)
        {
            if ((centerX - x) / grid_row_height % grid_row == 0)
            {
                paint.setStrokeWidth(heart_grid_border);
                paint.setColor(heart_grid_border_color);
            } else
            {
                paint.setStrokeWidth(heart_grid_line_border);
                paint.setColor(heart_grid_line_color);
            }
            canvas.drawLine(x, 0, x, viewHeight, paint);
        }


        // 画心电
        paint.setColor(heartColor);
        paint.setStrokeWidth(heart_line_border);
        int firstData = showDatas[0];
        int firstY = calculateY(firstData - Min, Max - Min, viewHeight);
        path.reset();
        path.moveTo(0, firstY);
        for (int i = 0; i < showDatas.length; i++)
        {
            int value = showDatas[i];
            int x = (int) (((float) i / showDatas.length) * viewWidth);
            int y = calculateY(value - Min, Max - Min, viewHeight);
            path.lineTo(x, y);
        }
        canvas.drawPath(path, paint);
    }


    @Override
    public void run()
    {
        try
        {
            while (loop)
            {
                // 根据采集的频率，自动算出每一个点之间暂停的时间
                int yield = (int) (1000 / (hz * heart_speed));
                Thread.sleep(yield);
                int point = dataQueue.take();
                for (int i = 0; i < showTimeDatas.length; i++)
                {
                    if (i + 1 < showTimeDatas.length)
                    {
                        showTimeDatas[i] = showTimeDatas[i + 1];
                    } else
                    {
                        showTimeDatas[i] = point;
                    }
                }
                postInvalidate();
            }
        } catch (InterruptedException e)
        {
            e.printStackTrace();
        }
    }

    /**
     * 根据最大值，控件高度，计算出当前值对应的控件的 Y 坐标
     *
     * @param value      参与计算的值
     * @param Region     最大值 - 最小值的区域
     * @param viewHeight 控件高度
     * @return
     */
    private static int calculateY(int value, int Region, int viewHeight)
    {
        return viewHeight - ((int) (((float) value / Region) * viewHeight));
    }

    /**
     * 测量自定义View的高度
     */
    private int measureHeight(int heightMeasureSpec)
    {
        int heightResult = 0;
        int heightSpecMode = View.MeasureSpec.getMode(heightMeasureSpec);
        int heightSpecSize = View.MeasureSpec.getSize(heightMeasureSpec);
        switch (heightSpecMode)
        {
            case View.MeasureSpec.UNSPECIFIED:
            {
                heightResult = heightSpecSize;
            }
            break;
            case View.MeasureSpec.AT_MOST:
            {
                heightResult = View.MeasureSpec.getSize(heightMeasureSpec);
            }
            break;
            case View.MeasureSpec.EXACTLY:
            {
                heightResult = View.MeasureSpec.getSize(heightMeasureSpec);
            }
        }
        return heightResult;
    }

    /**
     * 测量自定义View的宽度
     */
    private int measureWidth(int widthMeasureSpec)
    {
        int widthResult = 0;
        int widthSpecMode = View.MeasureSpec.getMode(widthMeasureSpec);
        int widthSpecSize = View.MeasureSpec.getSize(widthMeasureSpec);
        switch (widthSpecMode)
        {
            case View.MeasureSpec.UNSPECIFIED:
            {
                widthResult = widthSpecSize;
            }
            break;
            case View.MeasureSpec.AT_MOST:
            {
                widthResult = View.MeasureSpec.getSize(widthMeasureSpec);
            }
            break;
            case View.MeasureSpec.EXACTLY:
            {
                widthResult = View.MeasureSpec.getSize(widthMeasureSpec);
            }
        }
        return widthResult;
    }


    /**
     * dp 转 px
     *
     * @param context  上下文
     * @param dipValue dp值
     * @return
     */
    public float dip2px(Context context, float dipValue)
    {
        float scale = context.getResources().getDisplayMetrics().density;
        return dipValue * scale + 0.5f;
    }

    @Override
    protected void onWindowVisibilityChanged(int visibility)
    {
        super.onWindowVisibilityChanged(visibility);
        // Log.e("XIAOLEI", "onWindowVisibilityChanged:" + visibility);
    }

    @Override
    protected void onVisibilityChanged(View changedView, int visibility)
    {
        super.onVisibilityChanged(changedView, visibility);
        Log.e("XIAOLEI", "onVisibilityChanged:" + visibility);
    }
    // 这里原意是在View控件销毁的时候，把资源销毁掉
    // 可是当控件放到RecyclerView的时候，由可见到不可见，也会调用，故先注释，以后再想解决办法
    @Override
    protected void onDetachedFromWindow()
    {
        super.onDetachedFromWindow();
        // loop = false;
        // path.reset();
        // path.close();
        // showTimeDatas = null;
    }
}