1.新建一个常变量类Constant.java
package com.rain.db;
import android.graphics.Point;
public class Constant {
public static Point point;//获取屏幕的大小
}
2.新建一个函数ChartView.java
1 package com.rain.kongjian;
2
3 import com.rain.db.Constant;
4
5 import android.content.Context;
6 import android.graphics.Canvas;
7 import android.graphics.Color;
8 import android.graphics.Paint;
9 import android.view.View;
10
11 public class ChartView extends View{
12 public int XPoint=40; //原点的X坐标
13 public int YPoint=Constant.point.y/2; //原点的Y坐标
14 public int XScale=55; //X的刻度长度
15 public int YScale=40; //Y的刻度长度
16 public int XLength=Constant.point.x-100; //X轴的长度
17 public int YLength=Constant.point.y/2-100; //Y轴的长度
18 public String[] XLabel; //X的刻度
19 public String[] YLabel; //Y的刻度
20 public String[] Data; //数据
21 public String Title; //显示的标题
22 public ChartView(Context context)
23 {
24 super(context);
25 }
26 public void SetInfo(String[] XLabels,String[] YLabels,String[] AllData,String strTitle)
27 {
28 XLabel=XLabels;
29 YLabel=YLabels;
30 Data=AllData;
31 Title=strTitle;
32 XScale=XLength/AllData.length;//实际X的刻度长度
33 YScale=YLength/YLabels.length;
34 }
35 @Override
36 protected void onDraw(Canvas canvas){
37 super.onDraw(canvas);//重写onDraw方法
38
39 //canvas.drawColor(Color.WHITE);//设置背景颜色
40 Paint paint= new Paint();
41 paint.setStyle(Paint.Style.STROKE);
42 paint.setAntiAlias(true);//去锯齿
43 paint.setColor(Color.BLACK);//颜色
44 Paint paint1=new Paint();
45 paint1.setStyle(Paint.Style.STROKE);
46 paint1.setAntiAlias(true);//去锯齿
47 paint1.setColor(Color.DKGRAY);
48 paint.setTextSize(12); //设置轴文字大小
49 //设置Y轴
50 canvas.drawLine(XPoint, YPoint-YLength, XPoint, YPoint, paint); //轴线
51 for(int i=0;i*YScale<YLength ;i++)
52 {
53 canvas.drawLine(XPoint,YPoint-i*YScale, XPoint+5, YPoint-i*YScale, paint); //刻度
54 try
55 {
56 canvas.drawText(YLabel[i] , XPoint-30, YPoint-i*YScale+5, paint); //文字
57 }
58 catch(Exception e)
59 {
60 }
61 }
62 canvas.drawLine(XPoint,YPoint-YLength,XPoint-3,YPoint-YLength+6,paint); //箭头
63 canvas.drawLine(XPoint,YPoint-YLength,XPoint+3,YPoint-YLength+6,paint);
64 //设置字体的大小角度等
65 paint.setTextSize(20);
66 drawText(canvas,"单位:kWh", XPoint-5, YPoint-YLength+YScale-5, paint,-90);
67
68 //设置X轴
69 paint.setTextSize(12);
70 canvas.drawLine(XPoint,YPoint,XPoint+XLength,YPoint,paint); //轴线
71 for(int i=0;i*XScale<XLength;i++)
72 {
73 canvas.drawLine(XPoint+i*XScale, YPoint, XPoint+i*XScale, YPoint-5, paint); //刻度
74 try
75 {
76 // canvas.drawText(XLabel[i], XPoint + i * XScale - 10,
77 // YPoint + 20, paint); // 文字
78 drawText(canvas,XLabel[i], XPoint + i * XScale,
79 YPoint + 40, paint,-45); // 文字
80 // 数据值
81 if (i > 0 && YCoord(Data[i - 1]) != -999
82 && YCoord(Data[i]) != -999) // 保证有效数据
83 canvas.drawLine(XPoint + (i - 1) * XScale,
84 YCoord(Data[i - 1]), XPoint + i * XScale,
85 YCoord(Data[i]), paint);
86 canvas.drawCircle(XPoint + i * XScale, YCoord(Data[i]), 2,
87 paint);
88 } catch (Exception e) {
89 }
90 }
91 canvas.drawLine(XPoint+XLength,YPoint,XPoint+XLength-6,YPoint-3,paint); //箭头
92 canvas.drawLine(XPoint+XLength,YPoint,XPoint+XLength-6,YPoint+3,paint);
93 //设置标题位置
94 paint.setTextSize(28);
95 canvas.drawText(Title, XLength/2-28, 50, paint);
96 }
97 //设置文字显示方向
98 void drawText(Canvas canvas ,String text , float x ,float y,Paint paint ,float angle){
99 if(angle != 0){
100 canvas.rotate(angle, x, y);
101 }
102 canvas.drawText(text, x, y, paint);
103 if(angle != 0){
104 canvas.rotate(-angle, x, y);
105 }
106 }
107
108 private int YCoord(String y0) //计算绘制时的Y坐标，无数据时返回-999
109 {
110 int y;
111 try
112 {
113 y=Integer.parseInt(y0);
114 }
115 catch(Exception e)
116 {
117 return -999; //出错则返回-999
118 }
119 try
120 {
121 return YPoint-y*YScale/Integer.parseInt(YLabel[1]);
122 }
123 catch(Exception e)
124 {
125 }
126 return y;
127 }
128 }
3.在需要的地方调用ChartView.java，这里在nibianqi_zt.java中调用
package com.example.myfragment; import com.rain.kongjian.ChartView; import com.rain.db.Constant;
import android.app.ActionBar;
import android.app.Activity;
import android.os.Bundle;
import android.view.MenuItem;
public class nibianqi_zt extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
//setContentView(R.layout.nibianqi_zt);
/* 显示App icon左侧的back键 */
ActionBar actionBar = getActionBar();
actionBar.setDisplayHomeAsUpEnabled(true);
Constant.point = new Point(); getWindowManager().getDefaultDisplay().getSize(Constant.point);//获取屏幕分辨率
ChartView myView=new ChartView(this);
setContentView(myView);
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 String[] { "15", "23", "10", "36", "45", "40", "12" }, // 数据
"图标的标题");
}
// 顶部返回键
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case android.R.id.home:
finish();
return true;
default:
return super.onOptionsItemSelected(item);
}
}
}
效果演示如下：
时间： 2024-10-25 03:25:45