android surfaceview 畫

View Code

package xl.test;

import android.app.Activity;

import android.content.Context;

import android.graphics.Canvas;

import android.graphics.Color;

import android.graphics.Paint;

import android.graphics.Rect;

import android.os.Bundle;

import android.view.SurfaceHolder;

import android.view.SurfaceView;

public class ViewTest extends Activity {

/** Called when the activity is first created. */

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(new MyView(this));

}

//視圖内部類

class MyView extends SurfaceView implements SurfaceHolder.Callback

{

private SurfaceHolder holder;

private MyThread myThread;

public MyView(Context context) {

super(context);

// TODO Auto-generated constructor stub

holder = this.getHolder();

holder.addCallback(this);

myThread = new MyThread(holder);//建立一個繪圖線程

public void surfaceChanged(SurfaceHolder holder, int format, int width,

int height) {

// TODO Auto-generated method stub

public void surfaceCreated(SurfaceHolder holder) {

myThread.isRun = true;

myThread.start();

public void surfaceDestroyed(SurfaceHolder holder) {

myThread.isRun = false;

//線程内部類

class MyThread extends Thread

public boolean isRun ;

public MyThread(SurfaceHolder holder)

this.holder =holder;

isRun = true;

public void run()

int count = 0;

while(isRun)

Canvas c = null;

try

synchronized (holder)

c = holder.lockCanvas();//鎖定畫布，一般在鎖定後就可以通過其傳回的畫布對象Canvas，在其上面畫圖等操作了。

c.drawColor(Color.BLACK);//設定畫布背景顔色

Paint p = new Paint(); //建立畫筆

p.setColor(Color.WHITE);

Rect r = new Rect(100, 50, 300, 250);

c.drawRect(r, p);

c.drawText("這是第"+(count++)+"秒", 100, 310, p);

Thread.sleep(1000);//睡眠時間為1秒

catch (Exception e) {

// TODO: handle exception

e.printStackTrace();

finally

if(c!= null)

holder.unlockCanvasAndPost(c);//結束鎖定畫圖，并送出改變。