需求指点 点明要点

package com.example.dialog;
import java.util.Random;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.os.Handler;
import android.view.View;
public class Draw extends View{
int[] c=new int[]{0,0,0,0,0,0};
String[] b=new String[6];
ViewThread threa1;
Handler handler;
public Draw(Context context) {
super(context);
// TODO Auto-generated constructor stub
threa1=new ViewThread(Draw.this);
threa1.start();
}
@Override
protected void onDraw(Canvas canvas) {
// TODO Auto-generated method stub
//super.onDraw(canvas);
for(int sj=0;sj<6;sj++){
b[sj]=String.valueOf(c[sj]);
}
canvas.drawColor(Color.BLUE);
Paint paint=new Paint();
paint.setColor(Color.RED);
int a=150;
for(int i=0;i<6;i++)
{
canvas.drawCircle(a, 150-c[i], 5, paint);
canvas.drawText(b[i], a-5, 140-c[i], paint);
if(i!=5){
canvas.drawLine(a, 150-c[i],a+100, 150-c[i+1], paint);}
a+=100;
}
for(int n=0;n<5;n++){
c[n]=c[n+1];
b[n]=b[n+1];
}
Random random=new Random();
c[5]=random.nextInt(50);
b[5]=String.valueOf(c[5]);
}
class ViewThread extends Thread{
boolean isRun=true;
Draw draw1;
ViewThread(Draw draw)
{ draw1=draw;}
@Override
public void run() {
// TODO Auto-generated method stub
try {
Thread.sleep(2000);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
while(isRun){
// TODO Auto-generated method stub
try {draw1.postInvalidate();
sleep(5000);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
}
}