Android自定义view：折线图（附带动画效果）

package com.chk.uefa.thirdviews;

import android.content.Context;import android.graphics.Canvas;import android.graphics.Paint;import android.os.AsyncTask;import android.os.Handler;import android.os.Message;import android.util.AttributeSet;import android.view.View;

import com.lidroid.xutils.util.LogUtils;

/** * Created by yuLook on 2016/4/7. */public class BrokenLineView extends View {

    private String price1,price2,price3,price4,price5,price6,price7;    private String maxPrice,minPrice;    private int wide=0,high=0;

    public BrokenLineView(Context context) {        super(context);    }

    public BrokenLineView(Context context, AttributeSet attrs) {        super(context, attrs);    }

    public BrokenLineView(Context context, AttributeSet attrs, int defStyleAttr) {        super(context, attrs, defStyleAttr);    }

    /**七个价格坐标点*/    public void setSevenPrice(String price1,String price2,String price3,String price4,String price5,String price6,String price7){        this.price1=price1;        this.price2=price2;        this.price3=price3;        this.price4=price4;        this.price5=price5;        this.price6=price6;        this.price7=price7;    }

    /**Y轴最大值最小值*/    public void setMaxMinPrice(String maxPrice,String minPrice){        this.maxPrice=maxPrice;        this.minPrice=minPrice;    }

    /**获得宽高*/    public void setWideHigh(int wide,int high){        this.wide=wide;        this.high=high;

    }

    @Override    protected void onDraw(Canvas canvas) {        super.onDraw(canvas);

        Paint p = new Paint();        p.setStrokeWidth((float) 2.0);        p.setAntiAlias(true);// 设置画笔的锯齿效果        p.setColor(getResources().getColor(R.color.red));

        if(wide>0){

            if(time<=5&&time>0){

                double s_y = getRoundY(price1);                double e_y = getRoundY(price2);                double a=(s_y-e_y)/5;                double b=s_y-a*time;                canvas.drawLine(0,(float) getRoundY(price1), wide/30*time,(float)  b, p);

            }else if(time>5&&time<=10){

                double s_y = getRoundY(price2);                double e_y = getRoundY(price3);                double a=(s_y-e_y)/5;                double b=s_y-a*(time-5);

                canvas.drawLine(0,(float) getRoundY(price1), wide/6, (float) getRoundY(price2), p);                canvas.drawLine(wide/6,  (float) getRoundY(price2), wide/6+(wide/6)*(time-5)/5,   (float) b, p);            }else if(time>10&&time<=15){

                double s_y = getRoundY(price3);                double e_y = getRoundY(price4);                double a=(s_y-e_y)/5;                double b=s_y-a*(time-10);

                canvas.drawLine(0,(float) getRoundY(price1), wide/6, (float) getRoundY(price2), p);                canvas.drawLine(wide/6,  (float) getRoundY(price2), wide/3,   (float) getRoundY(price3), p);                canvas.drawLine(wide/3,  (float) getRoundY(price3), wide/3+(wide/6)*(time-10)/5,   (float) b,  p);            }else if(time>15&&time<=20){

                double s_y = getRoundY(price4);                double e_y = getRoundY(price5);                double a=(s_y-e_y)/5;                double b=s_y-a*(time-15);

                canvas.drawLine(0,(float) getRoundY(price1), wide/6, (float) getRoundY(price2), p);                canvas.drawLine(wide/6,  (float) getRoundY(price2), wide/3,   (float) getRoundY(price3), p);                canvas.drawLine(wide/3,  (float) getRoundY(price3), wide/2,   (float) getRoundY(price4),  p);                canvas.drawLine(wide/2,  (float) getRoundY(price4), wide/2+(wide/6)*(time-15)/5, (float) b,  p);            }else if(time>20&&time<=25){

                double s_y = getRoundY(price5);                double e_y = getRoundY(price6);                double a=(s_y-e_y)/5;                double b=s_y-a*(time-20);

                canvas.drawLine(0,(float) getRoundY(price1), wide/6, (float) getRoundY(price2), p);                canvas.drawLine(wide/6,  (float) getRoundY(price2), wide/3,   (float) getRoundY(price3), p);                canvas.drawLine(wide/3,  (float) getRoundY(price3), wide/2,   (float) getRoundY(price4),  p);                canvas.drawLine(wide/2,  (float) getRoundY(price4), wide/6*4, (float) getRoundY(price5),  p);                canvas.drawLine(wide/6*4,(float) getRoundY(price5), wide/6*4+(wide/6)*(time-20)/5, (float) b,  p);            }else if(time>25){

                double s_y = getRoundY(price6);                double e_y = getRoundY(price7);                double a=(s_y-e_y)/5;                double b=s_y-a*(time-25);

                canvas.drawLine(0,(float) getRoundY(price1), wide/6, (float) getRoundY(price2), p);                canvas.drawLine(wide/6,  (float) getRoundY(price2), wide/3,   (float) getRoundY(price3), p);                canvas.drawLine(wide/3,  (float) getRoundY(price3), wide/2,   (float) getRoundY(price4),  p);                canvas.drawLine(wide/2,  (float) getRoundY(price4), wide/6*4, (float) getRoundY(price5),  p);                canvas.drawLine(wide/6*4,(float) getRoundY(price5), wide/6*5, (float) getRoundY(price6),  p);                canvas.drawLine(wide/6*5,(float) getRoundY(price6), wide/6*5+(wide/6)*(time-25)/5,     (float) b,  p);            }

//            canvas.drawLine(0,(float) getRoundY(price1), wide/6, (float) getRoundY(price2), p);//            canvas.drawLine(wide/6,  (float) getRoundY(price2), wide/3,   (float) getRoundY(price3), p);//            canvas.drawLine(wide/3,  (float) getRoundY(price3), wide/2,   (float) getRoundY(price4),  p);//            canvas.drawLine(wide/2,  (float) getRoundY(price4), wide/6*4, (float) getRoundY(price5),  p);//            canvas.drawLine(wide/6*4,(float) getRoundY(price5), wide/6*5, (float) getRoundY(price6),  p);//            canvas.drawLine(wide/6*5,(float) getRoundY(price6), wide,     (float) getRoundY(price7),  p);

        }    }

    //获得Y轴坐标点    private double getRoundY(String str){        double d_max = Double.parseDouble(maxPrice);        double d_min = Double.parseDouble(minPrice);

        //return ((double) high)-((Double.parseDouble(str)-d_min)/(d_max-d_min))*high;        return ((Double.parseDouble(str)-d_min)/(d_max-d_min))*high;    }

    //动画异步任务    private int time=0;    public class task extends AsyncTask{

        private Handler handler;        public task(Handler handler){            this.handler=handler;        }

        @Override        protected Object doInBackground(Object[] params) {

            for(int i=1;i<31;i++){                try {                    time=i;                    handler.sendEmptyMessage(1);                    Thread.sleep((long) (600/30));                }catch (Exception p){                    p.printStackTrace();                }            }            handler.sendEmptyMessage(2);            return null;        }    }

    //接受消息刷新界面    private Handler handler=new Handler(){        @Override        public void handleMessage(Message msg) {            super.handleMessage(msg);            switch (msg.what){                case 1:                    invalidate();                    break;                case 2:                    if(a!=null){                        a.cancel(true);                        a=null;                    }                    break;            }        }    };

    private AsyncTask a;

    //开始动画    public void start(){        a=new task(handler);        a.execute();    }

    //手动结束动画    public void stop(){        if(a!=null){            a.cancel(true);            a=null;        }        time=0;        invalidate();    }

}