Surface和SurfaceView以及SurfaceHolder的认识及使用

MainActivity如下:

package cn.testcleancanvas;
import android.os.Bundle;
import android.app.Activity;
/*** Demo描述:* 0 Surface和SurfaceView以及SurfaceHolder的认识及使用* 1 Canvas清屏的实现* 2 在SurfaceView上不断绘制图片*   所绘制的图片在屏幕上的X轴值不断变化,所以给人感觉该图片在不断地移动.*   所以给我们一个启示:看到一个图片在屏幕上不停地移动不一定是利用动画做出来*   的效果,还有可能是draw出来的* * 笔记摘要:* 1 Surface用于管理数据，SurfaceView用于展示数据* 2 SurfaceHolder是一个接口，其作用相当于是Surface的监听器.*   SurfaceHolder提供了访问和控制SurfaceView背后的Surface的相关方法.*   即SurfaceHolder通过三个回调方法可知Surface的创建、销毁或者改变*   可通过SurfaceView中的方法getHolder()获得SurfaceView所对应的Surface所对应的SurfaceHolder* 3 SurfaceView是在一个新线程中绘制图像,而不是在UI线程* * 参考资料:* 0 http://blog.csdn.net/pathuang68/article/details/7351317* 1 http://blog.csdn.net/yanzi1225627/article/details/8236309* 2 http://blog.csdn.net/yuanlong_zheng/article/details/7592457*   Thank you very much* */
public class MainActivity extends Activity {private ImageMovingSurfaceView mImageMovingSurfaceView;private PhotoMovingSurfaceView mPhotoMovingSurfaceView;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);//方式一:mImageMovingSurfaceView=new ImageMovingSurfaceView(MainActivity.this);setContentView(mImageMovingSurfaceView);//方式二:
//		mPhotoMovingSurfaceView=
//		new PhotoMovingSurfaceView(MainActivity.this);
//		setContentView(mPhotoMovingSurfaceView);}}

ImageMovingSurfaceView如下:

package cn.testcleancanvas;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.PorterDuffXfermode;
import android.graphics.PorterDuff.Mode;
import android.view.SurfaceHolder;
import android.view.SurfaceHolder.Callback;
import android.view.SurfaceView;
/*** 参考资料:* 0 http://blog.csdn.net/pathuang68/article/details/7351317* 1 http://blog.csdn.net/yanzi1225627/article/details/8236309* 2 http://blog.csdn.net/yuanlong_zheng/article/details/7592457* * Thank you very much*/
public class ImageMovingSurfaceView extends SurfaceView implements Callback {private int lastX=0;private Paint mPaint;private Bitmap mBitmap;private Canvas mCanvas;private boolean isSurfaceRun = true;private SurfaceHolder mSurfaceHolder;private DrawMovingImageThread mDrawMovingImageThread;public ImageMovingSurfaceView(Context context) {super(context);init();}private void init(){mPaint=new Paint();//获取SurfaceView的SurfaceHoldermSurfaceHolder=this.getHolder();//为SurfaceHolder设置回调mSurfaceHolder.addCallback(this);mDrawMovingImageThread=new DrawMovingImageThread();mBitmap=BitmapFactory.decodeResource(getResources(), R.drawable.ic_launcher);}//开启线程不断地绘制Bitmapprivate class DrawMovingImageThread extends Thread{@Overridepublic void run() {super.run();while (isSurfaceRun) {drawMovingImage();try {Thread.sleep(300);} catch (Exception e) {e.printStackTrace();}}}}private void drawMovingImage(){//从SurfaceHolder获取画布,并在锁定后开始绘画mCanvas=mSurfaceHolder.lockCanvas();if (mCanvas!=null) {//以下四行为清屏的核心代码:Paint paint = new Paint();paint.setXfermode(new PorterDuffXfermode(Mode.CLEAR));mCanvas.drawPaint(paint);paint.setXfermode(new PorterDuffXfermode(Mode.SRC));//在每次画之前先进行清屏mCanvas.drawBitmap(mBitmap, lastX, 40, mPaint);lastX+=20;if (lastX>=370) {lastX=0;}//解锁mSurfaceHolder.unlockCanvasAndPost(mCanvas);}}//以下三个方法为android.view.SurfaceHolder.Callback接口的实现@Overridepublic void surfaceCreated(SurfaceHolder arg0) {mDrawMovingImageThread.start();}@Overridepublic void surfaceChanged(SurfaceHolder arg0, int arg1, int arg2, int arg3) {}@Overridepublic void surfaceDestroyed(SurfaceHolder arg0) {isSurfaceRun=false;}}

PhotoMovingSurfaceView如下:

package cn.testcleancanvas;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.PorterDuffXfermode;
import android.graphics.PorterDuff.Mode;
import android.view.SurfaceHolder;
import android.view.SurfaceHolder.Callback;
import android.view.SurfaceView;
/*** 参考资料:* 0 http://blog.csdn.net/pathuang68/article/details/7351317* 1 http://blog.csdn.net/yanzi1225627/article/details/8236309* 2 http://blog.csdn.net/yuanlong_zheng/article/details/7592457* * Thank you very much*/
public class PhotoMovingSurfaceView extends SurfaceView implements Callback {private int lastX=0;private Paint mPaint;private Bitmap mBitmap;private Canvas mCanvas;private boolean isSurfaceRun = true;private SurfaceHolder mSurfaceHolder;private DrawMovingImageThread mDrawMovingImageThread;public PhotoMovingSurfaceView(Context context) {super(context);init();}private void init(){mPaint=new Paint();//SurfaceView的方法getHolder()mSurfaceHolder=this.getHolder();mSurfaceHolder.addCallback(this);mDrawMovingImageThread=new DrawMovingImageThread();mBitmap=BitmapFactory.decodeResource(getResources(), R.drawable.ic_launcher);}//开启线程不断地绘制Bitmapprivate class DrawMovingImageThread extends Thread{@Overridepublic void run() {super.run();while (isSurfaceRun) {drawMovingImage();try {Thread.sleep(300);} catch (Exception e) {e.printStackTrace();}}}}private void drawMovingImage(){mCanvas=mSurfaceHolder.lockCanvas();if (mCanvas!=null) {//以下四行为清屏的核心代码:Paint paint = new Paint();paint.setXfermode(new PorterDuffXfermode(Mode.CLEAR));mCanvas.drawPaint(paint);paint.setXfermode(new PorterDuffXfermode(Mode.SRC));//在每次画之前先进行清屏mCanvas.drawBitmap(mBitmap, lastX, 40, mPaint);lastX+=20;if (lastX>=370) {lastX=0;}mSurfaceHolder.unlockCanvasAndPost(mCanvas);}}@Overrideprotected void onDraw(Canvas canvas) {super.onDraw(canvas);mDrawMovingImageThread.start();}//以下三个方法为android.view.SurfaceHolder.Callback接口的实现@Overridepublic void surfaceCreated(SurfaceHolder holder) {//调用SurfaceView的onDraw()方法onDraw(null);}@Overridepublic void surfaceChanged(SurfaceHolder arg0, int arg1, int arg2, int arg3) {}@Overridepublic void surfaceDestroyed(SurfaceHolder arg0) {isSurfaceRun=false;}}

main.xml如下:

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