android:怎樣用一天時間，寫出“飛機大戰”這種遊戲！（無架構-SurfaceView繪製）

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序言
作為一個android開發人員，時常想開發一個小遊戲娛樂一下大家，今天就說說，我是怎麼樣一天寫出一個簡單的“飛機大戰”的.

體驗地址：http://www.wandoujia.com/apps/edu.njupt.zhb.planegame

源碼：https://github.com/nuptboyzhb/newplanegame

遊戲分析

玩過“飛機大戰”遊戲的都知道，飛機大戰中的主要“角色”有：
1.玩家飛機
2.敵方飛機
3.玩家飛機發送的子彈
4.敵方Boss飛機發送的子彈
我們須要控制的有：
1.繪製螢幕內的角色
2.控制角色的邏輯。比方：敵方飛機與我方飛機的碰撞檢測，我方飛機發射的子彈與敵方飛機之間的碰撞檢測，敵方Boss飛機發射的子彈與我方飛機直接的碰撞檢測等等。
資源：
要完畢一個遊戲，還要有資源的載入。比方飛機，子彈等圖片的載入等，音效的載入。
遊戲背景的繪製
事實上是一張圖，這張圖能夠首尾相接。也即是“捲軸”，原理就是卡馬克捲軸演算法的原理。
以下分析代碼區：

事實上，拋開android平台，不論什麼一個平台，做這樣一個遊戲。都須要這些邏輯。針對android平台。我們看一下，SurfaceView的繪製架構。

直接貼代碼：

package edu.njupt.zhb.game.view;/** *  * @author Zheng Haibo * @webset: http://www.mobctrl.net * @android開發聯盟QQ群：272209595 */public class PlaneView extends SurfaceView implements Callback, Runnable {private SurfaceHolder surfaceHolder;private long sleep_time = 16;//繪製周期private int screenHeight;private int screenWidth;private Thread thread;private Canvas canvas;private Paint paint；private GameScreen currentScreen;private int level = 0;private int backgroundSpeed = 1;public PlaneView(Context context) {super(context);System.out.println("debug:PlaneView()");surfaceHolder = this.getHolder();surfaceHolder.addCallback(this);surfaceHolder.setFormat(PixelFormat.TRANSLUCENT);paint = new Paint();paint.setAntiAlias(true);paint.setDither(true);}@Overridepublic void surfaceCreated(SurfaceHolder holder) {System.out.println("debug:surfaceCreated");setZOrderOnTop(false);isGameOver = false;if (isPause) {return;}screenHeight = this.getHeight();screenWidth = this.getWidth();initPlane();thread = new Thread(this);thread.start();}@Overridepublic void surfaceChanged(SurfaceHolder holder, int format, int width,int height) {System.out.println("debug:surfaceChanged");}@Overridepublic void surfaceDestroyed(SurfaceHolder holder) {System.out.println("debug:surfaceDestroyed");if (lift > 0) {planeViewCallback.onGamePause();}isPause = true;}@Overridepublic void run() {while (!isGameOver) {//控制繪製周期if (isPause) {try {Thread.sleep(sleep_time);} catch (InterruptedException e) {// TODO Auto-generated catch blocke.printStackTrace();}continue;}long starttime = System.currentTimeMillis();drawScreen();long time = System.currentTimeMillis() - starttime;if (time < sleep_time) {try {Thread.sleep(sleep_time - time);} catch (InterruptedException e) {e.printStackTrace();}}}}/** * 繪製情境 */private void drawScreen() {canvas = surfaceHolder.lockCanvas();if (null == canvas) {return;}//清除canvas.drawColor(Color.WHITE, PorterDuff.Mode.CLEAR);paint.setAlpha(255);gameLogic();gameDraw();if (null != canvas) {surfaceHolder.unlockCanvasAndPost(canvas);}}/** * 遊戲邏輯 */private void gameLogic() {//TO DO 控制遊戲邏輯...}private void gameDraw() {    //先繪製遊戲背景drawBackground(backgroundSpeed * frameSeq);if (currentScreen == GameScreen.NORMAL) {synchronized (planes) {drawPlanes();drawBullets();drawMasterPlane();}} else if (currentScreen == GameScreen.BOSS) {drawBullets();drawBossPlane();drawBossBullets();drawMasterPlane();}}private void drawBossPlane() {if (null != bossPlane) {if (bossPlane.isClicked()) {// draw blast imgbossPlane.onBlastDraw(canvas, paint);if (bossPlane.isBlastFrameEnd()) {bossPlane.setClicked(false);}}bossPlane.onDraw(canvas, paint);}}@Overrideprotected void onDraw(Canvas canvas) {// TODO Auto-generated method stubsuper.onDraw(canvas);System.out.println("debug:onDraw");}@Overrideprotected void onDetachedFromWindow() {super.onDetachedFromWindow();System.out.println("debug:onDetachedFromWindow...");isPause = false;isGameOver = true;//釋放資源for (PlaneRes plane : planesRes) {plane.getBitmap().recycle();}for (BulletRes bulletRes : bulletsRes) {bulletRes.getBitmap().recycle();}}/*** 使用者互動*/@Overridepublic boolean onTouchEvent(MotionEvent e) {int x = (int) e.getX();int y = (int) e.getY();switch (e.getAction()) {case MotionEvent.ACTION_DOWN:if (masterPlane.isContainPoint(x, y)) {isMove = true;}break;case MotionEvent.ACTION_MOVE:if (isMove) {synchronized (masterPlane) {masterPlane.updatePosition(x, y);//控制玩家飛機的移動}}break;case MotionEvent.ACTION_UP:isMove = false;break;}return true;}}

對於背景的繪製。事實上是迴圈繪製一張圖：本遊戲的繪製邏輯：

private void drawBackground(int yOffset) {yOffset %= screenHeight;if (yOffset == 0) {canvas.drawBitmap(backgroundBmp, 0, 0, paint);} else {canvas.drawBitmap(backgroundBmp, new Rect(0,screenHeight - yOffset, screenWidth, screenHeight),new Rect(0, 0, screenWidth, yOffset + 1), paint);canvas.drawBitmap(backgroundBmp, new Rect(0, 0, screenWidth,screenHeight - yOffset), new Rect(0, yOffset, screenWidth,screenHeight), paint);}}

然後，我們僅僅須要在一個布局上，將PlaneView加入進去就可以：

如：

planeView = new PlaneView(this);planeView.setPlaneViewCallback(this);planeView.setGameOverCallback(this);planeView.isMediaOpen = this.isMediaOpen;LayoutParams lp = new LayoutParams(LayoutParams.MATCH_PARENT,LayoutParams.MATCH_PARENT);rl_plane.addView(planeView, lp);

未完待續。

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android:怎樣用一天時間，寫出“飛機大戰”這種遊戲！（無架構-SurfaceView繪製）