android SurfaceView实现人物动画

经常看到别人的游戏中有人物跑动的效果，对这个东西很好奇，刚好群里上传了“忍者突袭”的代码，我看了里面的代码，但对画人物那段还是没咋弄，所以自己写一个测试程序，程序中使用到的图片资源是来自“忍者突袭”的代码，真心的感谢写“忍者突袭”代码的人～～

人物角色使用的图片如下：

在画人物角色时会对这张图片进行剪切，使用的函数是

mCanvas.clipRect(mClipRect);

绘制人物角色的思想是使用mCanvas.clipRect(mClipRect);函数来设置画布显示的位置及大小,假设为(presentX，presentY，presentX + width/10, presentY + height)(presentX和presentY为现在图片的位置，width和height为图片的宽度和高度)，然后使用mCanvas.drawBitmap来绘制图片，第一次绘制图片的位置是(presentX，presentY)，然后将绘制图片的位置修改为(presentX - width / 10, presentY),第二次设置的画布显示的位置仍然是presentX，presentY，presentX + width/10, presentY + height，绘制图片的位置是(presentX - width / 10, presentY)，而第二张图片的位置刚好是presentX，presentY，所以显示的是第二张图片，依次类推的实现其它图片的显示。

实例代码如下：

package com.example.runmanenvironmenttest;import android.content.Context;import android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.Paint;import android.graphics.Rect;import android.util.AttributeSet;import android.view.SurfaceHolder;import android.view.SurfaceView;public class MyView extends SurfaceView implements SurfaceHolder.Callback, Runnable{private SurfaceHolder holder;  private Canvas mCanvas;private Bitmap mBg1;private Bitmap mPlay1;private int mWidth;private int mHeight;private Paint mPaint;private String tag = "xiao";private BitmapFactory.Options ops;private Rect mRect;private Rect mClipRect;private int mPosition = 20;private int mPicPosition = 0;private int mStep = 5;private int mBamHeight = 600;public MyView(Context context, AttributeSet attrs) {super(context, attrs);// TODO Auto-generated constructor stubholder = this.getHolder();          holder.addCallback(this);        mPaint = new Paint();        mPaint.setColor(Color.YELLOW);                ops = new BitmapFactory.Options();        mBg1 = BitmapFactory.decodeResource(this.getResources(),R.drawable.bg1, ops);               mPlay1 = BitmapFactory.decodeResource(getResources(), R.drawable.dartman, ops);}@Overridepublic void surfaceChanged(SurfaceHolder holder, int format, int width,int height) {// TODO Auto-generated method stubmWidth = width;mHeight = height;mRect = new Rect(0, 0, mWidth, mHeight);new Thread(this).start();}@Overridepublic void surfaceCreated(SurfaceHolder holder) {// TODO Auto-generated method stub}@Overridepublic void surfaceDestroyed(SurfaceHolder holder) {// TODO Auto-generated method stub}@Overridepublic void run() {// TODO Auto-generated method stub//myDraw();while(true){try {mClipRect = new Rect(mPosition * mStep + mPlay1.getWidth() / 10, mBamHeight,mPosition * mStep + 2 * mPlay1.getWidth() / 10, mBamHeight - mPlay1.getHeight());mCanvas = holder.lockCanvas();if (mCanvas != null) {mCanvas.drawBitmap(mBg1, null,mRect, mPaint);mCanvas.save();mCanvas.clipRect(mClipRect);mCanvas.drawBitmap(mPlay1, mPlay1.getWidth() / 10 + mPosition * mStep - mPicPosition * mPlay1.getWidth() / 10, mBamHeight - mPlay1.getHeight(), mPaint);mCanvas.restore();mPicPosition++;if(mPosition * mStep > mWidth){mPosition = 0;}if(mPicPosition > 9){mPicPosition = 0;}}} catch (Exception e) {e.printStackTrace();} finally {if (mCanvas != null) {holder.unlockCanvasAndPost(mCanvas);}}try {Thread.sleep(1000);} catch (InterruptedException e) {// TODO Auto-generated catch blocke.printStackTrace();}}}}

源代码下载地址：http://download.csdn.net/detail/xiaoxiaobian3310903/4565995