我的android绘图学习笔记（二）

然后试一下从ArrayList里面读数据，画折线图

package com.test;
import java.util.ArrayList;
import java.util.Iterator;
import android.app.Activity;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Path;
import android.os.Bundle;
import android.view.View;
public class testPaint extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
MyView myview = new MyView(this);
setContentView(myview);
}
private class MyView extends View {
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
canvas.drawColor(Color.WHITE);
Paint paint =new Paint();
paint.setAntiAlias(true);
paint.setColor(Color.BLACK);
Paint paint1=new Paint();
paint1.setColor(Color.RED);
canvas.drawLine(30, 160, 300, 160, paint);
canvas.drawLine(30, 160, 30, 30, paint);
Path path=new Path();
path.moveTo(30, 30);
path.lineTo(25,35);
path.lineTo(30, 25);
path.lineTo(35, 35);
canvas.drawPath(path, paint);

Path path1=new Path();
path1.moveTo(300, 160);
path1.lineTo(295,155);
path1.lineTo(305, 160);
path1.lineTo(295, 165);
canvas.drawPath(path1, paint);

paint.setTextSize(12);
canvas.drawText(getResources().getString(R.string.date), 280, 180,
paint);
canvas.drawText(getResources().getString(R.string.product), 1, 40, paint);
ArrayList<myPoint> list=new ArrayList();
myPoint po = new myPoint(30,160);
list.add(po);
myPoint po1 = new myPoint(100,120);
list.add(po1);
myPoint po2 = new myPoint(220,80);
list.add(po2);
int lastX = 30;
int lastY = 160;
Iterator<myPoint> it = list.iterator();
for(int i=0;i<list.size();i++)
{
po=it.next();
canvas.drawLine(lastX, lastY, po.m_x, po.m_y, paint);
lastX = po.m_x;
lastY = po.m_y;
}
}
public MyView(Context context) {
super(context);
}

}
}

运行效果