希望实现一个折线图，但没有找到合适的控件或者代码，只有一个基本样子的，在它的基础上，进行了一些改进，改得比较灵活，可以传递参数，可以设置位置，坐标轴长度，刻度长度等。
自定义的ChartView.java
package jetz.common;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.view.View;
public class ChartView extends View{
public int XPoint=40; //原点的X坐标
public int YPoint=260; //原点的Y坐标
public int XScale=55; //X的刻度长度
public int YScale=40; //Y的刻度长度
public int XLength=380; //X轴的长度
public int YLength=240; //Y轴的长度
public String[] XLabel; //X的刻度
public String[] YLabel; //Y的刻度
public String[] Data; //数据
public String Title; //显示的标题
public ChartView(Context context)
{
super(context);
}
public void SetInfo(String[] XLabels,String[] YLabels,String[] AllData,String strTitle)
{
XLabel=XLabels;
YLabel=YLabels;
Data=AllData;
Title=strTitle;
}
@Override
protected void onDraw(Canvas canvas){
super.onDraw(canvas);//重写onDraw方法
//canvas.drawColor(Color.WHITE);//设置背景颜色
Paint paint= new Paint();
paint.setStyle(Paint.Style.STROKE);
paint.setAntiAlias(true);//去锯齿
paint.setColor(Color.BLUE);//颜色
Paint paint1=new Paint();
paint1.setStyle(Paint.Style.STROKE);
paint1.setAntiAlias(true);//去锯齿
paint1.setColor(Color.DKGRAY);
paint.setTextSize(12); //设置轴文字大小
//设置Y轴
canvas.drawLine(XPoint, YPoint-YLength, XPoint, YPoint, paint); //轴线
for(int i=0;i*YScale<YLength ;i++)
{
canvas.drawLine(XPoint,YPoint-i*YScale, XPoint+5, YPoint-i*YScale, paint); //刻度
try
{
canvas.drawText(YLabel[i] , XPoint-22, YPoint-i*YScale+5, paint); //文字
}
catch(Exception e)
{
}
}
canvas.drawLine(XPoint,YPoint-YLength,XPoint-3,YPoint-YLength+6,paint); //箭头
canvas.drawLine(XPoint,YPoint-YLength,XPoint+3,YPoint-YLength+6,paint);
//设置X轴
canvas.drawLine(XPoint,YPoint,XPoint+XLength,YPoint,paint); //轴线
for(int i=0;i*XScale<XLength;i++)
{
canvas.drawLine(XPoint+i*XScale, YPoint, XPoint+i*XScale, YPoint-5, paint); //刻度
try
{
canvas.drawText(XLabel[i] , XPoint+i*XScale-10, YPoint+20, paint); //文字
//数据值
if(i>0&&YCoord(Data[i-1])!=-999&&YCoord(Data[i])!=-999) //保证有效数据
canvas.drawLine(XPoint+(i-1)*XScale, YCoord(Data[i-1]), XPoint+i*XScale, YCoord(Data[i]), paint);
canvas.drawCircle(XPoint+i*XScale,YCoord(Data[i]), 2, paint);
}
catch(Exception e)
{
}
}
canvas.drawLine(XPoint+XLength,YPoint,XPoint+XLength-6,YPoint-3,paint); //箭头
canvas.drawLine(XPoint+XLength,YPoint,XPoint+XLength-6,YPoint+3,paint);
paint.setTextSize(16);
canvas.drawText(Title, 150, 50, paint);
}
private int YCoord(String y0) //计算绘制时的Y坐标，无数据时返回-999
{
int y;
try
{
y=Integer.parseInt(y0);
}
catch(Exception e)
{
return -999; //出错则返回-999
}
try
{
return YPoint-y*YScale/Integer.parseInt(YLabel[1]);
}
catch(Exception e)
{
}
return y;
}
}
——————————————————————————————–
调用方法：
ChartView myView=new ChartView(this);
myView.SetInfo(
new String[]{“7-11″,”7-12″,”7-13″,”7-14″,”7-15″,”7-16″,”7-17”}, //X轴刻度
new String[]{“”,”50″,”100″,”150″,”200″,”250″}, //Y轴刻度
new int[]{15,23,10,36,45,40,12}, //数据
“图标的标题”
);