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 stub
		holder = 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);
	}
	
	@Override
	public void surfaceChanged(SurfaceHolder holder, int format, int width,
			int height) {
		// TODO Auto-generated method stub
		mWidth = width;
		mHeight = height;
		mRect = new Rect(0, 0, mWidth, mHeight);
		
		new Thread(this).start();
	}

	@Override
	public void surfaceCreated(SurfaceHolder holder) {
		// TODO Auto-generated method stub
		
	}

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

	@Override
	public 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 block
				e.printStackTrace();
			}
		}
	}
}

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