引用:
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)); } //视图内部类 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);//创建一个绘图线程 } @Override public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) { // TODO Auto-generated method stub } @Override public void surfaceCreated(SurfaceHolder holder) { // TODO Auto-generated method stub myThread.isRun = true; myThread.start(); } @Override public void surfaceDestroyed(SurfaceHolder holder) { // TODO Auto-generated method stub myThread.isRun = false; } } //线程内部类 class MyThread extends Thread { private SurfaceHolder holder; public boolean isRun ; public MyThread(SurfaceHolder holder) { this.holder =holder; isRun = true; } @Override public void run() { int count = 0; while(isRun) { Canvas c = null; try { synchronized (holder) { c = holder.lockCanvas();//锁定画布,一般在锁定后就可以通过其返回的画布对象Canvas,在其上面画图等操作了。 c.drawColor(Color.BLACK);//设置画布背景颜色 Paint p = new Paint(); //创建画笔 p.setColor(Color.WHITE); Rect r = new Rect(100, 50, 300, 250); c.drawRect(r, p); c.drawText("这是第"+(count++)+"秒", 100, 310, p); Thread.sleep(1000);//睡眠时间为1秒 } } catch (Exception e) { // TODO: handle exception e.printStackTrace(); } finally { if(c!= null) { holder.unlockCanvasAndPost(c);//结束锁定画图,并提交改变。 } } } } } }