Android的View绘图并移动

import android.app.Activity;import android.content.Context;import android.graphics.*;import android.os.*;import android.view.View;public class MainActivity extends Activity {    /** Called when the activity is first created. */private MyView my;    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        my=new MyView(this);        setContentView(my);        Thread t=new Thread(my);        t.start();    }}class MyView extends View implements Runnable{private int count=0;Str str;public MyView(Context context) {super(context);// TODO Auto-generated constructor stubstr=new Str("开心的很厉害", 20, 20);//创建对象Thread t=new Thread(str);t.start();}public void run() {// TODO Auto-generated method stubwhile(true){try {Thread.sleep(300);} catch (InterruptedException e) {// TODO Auto-generated catch blocke.printStackTrace();}this.postInvalidate();//刷新}}public void onDraw(Canvas canvas){Paint p=new Paint();p.setColor(Color.RED);p.setTextSize(28);p.setAntiAlias(true);canvas.drawRGB(255, 255, 255);canvas.drawText(str.text, str.x, str.y, p);}}class Str implements Runnable{//文字类String text;int x;int y;int speed=10;public Str(String text,int x,int y){this.text=text;this.x=x;this.y=y;}@Overridepublic void run() {// TODO Auto-generated method stubwhile(true){y+=speed;try {Thread.sleep(300);} catch (InterruptedException e) {// TODO Auto-generated catch blocke.printStackTrace();}}}
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