import android.app.Activity;  import android.content.Context;  import android.graphics.Canvas;  import android.graphics.Color;  import android.graphics.Paint;  import android.os.Bundle;  import android.view.SurfaceHolder;  import android.view.SurfaceView;  

public class TestSurfaceView extends Activity {  /** Called when the activity is first created. */      @Override  public void onCreate(Bundle savedInstanceState) {  super.onCreate(savedInstanceState);          setContentView(new MyView(this));      }  

class MyView extends SurfaceView implements SurfaceHolder.Callback,Runnable{          SurfaceHolder holder=null;          Paint paint;  public MyView(Context context) {  super(context);  // TODO Auto-generated constructor stub              holder=getHolder();              holder.addCallback(this);              paint=new Paint(Paint.ANTI_ALIAS_FLAG);              paint.setColor(Color.RED);  

this.setFocusable(true);          }  

        @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              Thread t=new Thread(this);              t.start();          }  

        @Override  public void surfaceDestroyed(SurfaceHolder holder) {  // TODO Auto-generated method stub              isRunning=false;          }  

        @Override  protected void onDraw(Canvas canvas) {  // TODO Auto-generated method stub              canvas=holder.lockCanvas();  //刷屏                canvas.drawColor(Color.BLACK);  

            canvas.drawCircle(x, y, 10, paint);  

            holder.unlockCanvasAndPost(canvas);          }  private void paint(Paint paint) {              Canvas canvas=holder.lockCanvas();  //刷屏                canvas.drawColor(Color.BLACK);  

            canvas.drawCircle(x, y, 10, paint);  

            holder.unlockCanvasAndPost(canvas);          }  

boolean isRunning=true;          @Override  public void run() {  // TODO Auto-generated method stub              while (isRunning) {  //              onDraw(null);                  paint(paint);                  move();  try {                      Thread.sleep(50);                  } catch (InterruptedException e) {  // TODO Auto-generated catch block                      e.printStackTrace();                  }  

            }          }  

private int x,y;  private void move(){              x+=2;              y+=2;          }      }  

}  

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