Android游戏中动画的实现

package com.demo.game; import android.graphics.Canvas; import android.graphics.Paint; import android.graphics.Color; import android.os.Bundle; import android.util.Log; import android.view.SurfaceHolder; import android.view.SurfaceHolder.Callback; import android.view.SurfaceView; import android.content.Context; import android.util.AttributeSet; public class GameView extends SurfaceView implements Callback,Runnable { private boolean mIsRunning = false; private Canvas mCanvas = null; private SurfaceHolder mSurfaceHolder = null; private Thread mThread = null; private Paint mPaint = null; private int mY = 0; public GameView(Context context, AttributeSet attr) { super(context, attr); mPaint = new Paint(); mPaint.setColor(0xffff0000); mPaint.setStrokeWidth(3); mPaint.setAntiAlias(true); mSurfaceHolder = getHolder(); mSurfaceHolder.addCallback(this); } public void surfaceChanged(SurfaceHolder arg0, int arg1, int arg2, int arg3) { } public void surfaceCreated(SurfaceHolder arg0) { mIsRunning = true; mThread = new Thread(this); mThread.start(); } public void surfaceDestroyed(SurfaceHolder arg0) { mIsRunning = false; try { mThread.join(); } catch (Exception e) { e.printStackTrace(); } } public void run() { while (mIsRunning) { try { Thread.sleep(40); } catch (InterruptedException e) { e.printStackTrace(); } synchronized (mSurfaceHolder) { mCanvas =mSurfaceHolder.lockCanvas(); Draw(); mSurfaceHolder.unlockCanvasAndPost(mCanvas); } } } private void Draw() { mCanvas.drawColor(Color.BLACK); mCanvas.drawLine(0, mY, 300, mY, mPaint); mY++; if (mY > 300) mY = 0; } };