安卓是什么游戏贪吃蛇中Coordinate类是什么意思

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> 【贪吃蛇—Java软件工程师写Android游戏】系列 1.Android SDK Sample-Snake详解
【贪吃蛇—Java软件工程师写Android游戏】系列 1.Android SDK Sample-Snake详解
rocinante & at
系列 1.Android SDK Sample-Snake详解
Snake也是一个经典游戏了, Nokia蓝屏机的王牌游戏之一。 Android SDK 1.5就有了它的身影。我们这里就来详细解析一下 Android SDK Sample中的 Snake工程。本工程基于 SDK 2.3.3版本中的工程,路径为: %Android_SDK_HOME% /samples/android-10/Snake一、 Eclipse 工程通过 File-New Project-Android-Android Project,选择“ Create project from existing sample”创建自己的应用 SnakeAndroid,如下图:运行效果如下图:二、工程结构和类图其实 Snake的工程蛮简单的,源文件就三个: Snake.java SnakeView.java TileView.java。 Snake类是这个游戏的入口点, TitleView类进行游戏的绘画, SnakeView类则是对游戏控制操作的处理。 Coordinate, RefreshHandler是 2个辅助类,也是 SnakeView类中的内部类。其中, Coordinate是一个点的坐标( x, y), RefreshHandler将 RefreshHandler对象绑定某个线程并给它发送消息。如下图:任何游戏都需要有个引擎来推动游戏的运行,最简化的游戏引擎就是:在一个线程中 While循环,检测用户操作,对用户的操作作出反应,更新游戏的界面,直到用户退出游戏。在 Snake这个游戏中,辅助类 RefreshHandler继承自 Handler,用来把 RefreshHandler与当前线程进行绑定,从而可以直接给线程发送消息并处理消息。注意一点: Handle对消息的处理都是异步。 RefreshHandler在 Handler的基础上增加 sleep()接口,用来每隔一个时间段后给当前线程发送一个消息。 handleMessage()方法在接受消息后,根据当前的游戏状态重绘界面,运行机制如下:运行机制这比较类似定时器的概念,在特定的时刻发送消息,根据消息处理相应的事件。 update()与 sleep()间接的相互调用就构成了一个循环。这里要注意: mRedrawHandle绑定的是 Avtivity所在的线程,也就是程序的主线程;另外由于 sleep()是个异步函数,所以 update()与 sleep()之间的相互调用才没有构成死循环。最后分析下游戏数据的保存机制,如下:这里考虑了 Activity的生命周期:如果用户在游戏期间离开游戏界面,游戏暂停;或者由于内存比较紧张, Android关闭游戏释放内存,那么当用户返回游戏界面的时候恢复到上次离开时的界面。三、源码解析详细解析下源代码,由于代码量不大,以注释的方式列出如下:1、 Snake.java  /**
* &p&Title: Snake&/p&
* &p&Copyright: (C) 2007 The Android Open Source Project. Licensed under the Apache License, Version 2.0 (the "License")&/p&
* @author Gavin 标注
package com.deaboway.
import android.app.A
import android.os.B
import android.widget.TextV
* Snake: a simple game that everyone can enjoy.
* This is an implementation of the classic Game "Snake", in which you control a
* serpent roaming around the garden looking for apples. Be careful, though,
* because when you catch one, not only will you become longer, but you'll move
* faster. Running into yourself or the walls will end the game.
// 贪吃蛇: 经典游戏,在一个花园中找苹果吃,吃了苹果会变长,速度变快。碰到自己和墙就挂掉。
public class Snake extends Activity {
private SnakeView mSnakeV
private static String ICICLE_KEY = "snake-view";
* Called when Activity is first created. Turns off the title bar, sets up
* the content views, and fires up the SnakeView.
// 在 activity 第一次创建时被调用
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.snake_layout);
mSnakeView = (SnakeView) findViewById(R.id.snake);
mSnakeView.setTextView((TextView) findViewById(R.id.text));
// 检查存贮状态以确定是重新开始还是恢复状态
if (savedInstanceState == null) {
// 存储状态为空,说明刚启动可以切换到准备状态
mSnakeView.setMode(SnakeView.READY);
// 已经保存过,那么就去恢复原有状态
Bundle map = savedInstanceState.getBundle(ICICLE_KEY);
if (map != null) {
// 恢复状态
mSnakeView.restoreState(map);
// 设置状态为暂停
mSnakeView.setMode(SnakeView.PAUSE);
// 暂停事件被触发时
protected void onPause() {
super.onPause();
// Pause the game along with the activity
mSnakeView.setMode(SnakeView.PAUSE);
// 状态保存
public void onSaveInstanceState(Bundle outState) {
// 存储游戏状态到View里
outState.putBundle(ICICLE_KEY, mSnakeView.saveState());
2、 SnakeView.java  /**
* &p&Title: Snake&/p&
* &p&Copyright: (C) 2007 The Android Open Source Project. Licensed under the Apache License, Version 2.0 (the "License")&/p&
* @author Gavin 标注
package com.deaboway.
import java.util.ArrayL
import java.util.R
import android.content.C
import android.content.res.R
import android.os.H
import android.os.M
import android.util.AttributeS
import android.os.B
import android.util.L
import android.view.KeyE
import android.view.V
import android.widget.TextV
* SnakeView: implementation of a simple game of Snake
public class SnakeView extends TileView {
private static final String TAG = "Deaboway";
* Current mode of application: READY to run, RUNNING, or you have already
* lost. static final ints are used instead of an enum for performance
* reasons.
// 游戏状态,默认值是准备状态
private int mMode = READY;
// 游戏的四个状态 暂停 准备 运行 和 失败
public static final int PAUSE = 0;
public static final int READY = 1;
public static final int RUNNING = 2;
public static final int LOSE = 3;
// 游戏中蛇的前进方向,默认值北方
private int mDirection = NORTH;
// 下一步的移动方向,默认值北方
private int mNextDirection = NORTH;
// 游戏方向设定 北 南 东 西
private static final int NORTH = 1;
private static final int SOUTH = 2;
private static final int EAST = 3;
private static final int WEST = 4;
* Labels for the drawables that will be loaded into the TileView class
// 三种游戏元
private static final int RED_STAR = 1;
private static final int YELLOW_STAR = 2;
private static final int GREEN_STAR = 3;
* mScore: used to track the number of apples captured mMoveDelay: number of
* milliseconds between snake movements. This will decrease as apples are
* captured.
// 游戏得分
private long mScore = 0;
// 移动延迟
private long mMoveDelay = 600;
* mLastMove: tracks the absolute time when the snake last moved, and is
* used to determine if a move should be made based on mMoveDelay.
// 最后一次移动时的毫秒时刻
private long mLastM
* mStatusText: text shows to the user in some run states
// 显示游戏状态的文本组件
private TextView mStatusT
* mSnakeTrail: a list of Coordinates that make up the snake's body
* mAppleList: the secret location of the juicy apples the snake craves.
// 蛇身数组(数组以坐标对象为元素)
private ArrayList&Coordinate& mSnakeTrail = new ArrayList&Coordinate&();
// 苹果数组(数组以坐标对象为元素)
private ArrayList&Coordinate& mAppleList = new ArrayList&Coordinate&();
* Everyone needs a little randomness in their life
private static final Random RNG = new Random();
* Create a simple handler that we can use to cause animation to happen. We
* set ourselves as a target and we can use the sleep() function to cause an
* update/invalidate to occur at a later date.
// 创建一个Refresh Handler来产生动画: 通过sleep()来实现
private RefreshHandler mRedrawHandler = new RefreshHandler();
// 一个Handler
class RefreshHandler extends Handler {
// 处理消息队列
public void handleMessage(Message msg) {
// 更新View对象
SnakeView.this.update();
// 强制重绘
SnakeView.this.invalidate();
// 延迟发送消息
public void sleep(long delayMillis) {
this.removeMessages(0);
sendMessageDelayed(obtainMessage(0), delayMillis);
* Constructs a SnakeView based on inflation from XML
* @param context
* @param attrs
// 构造函数
public SnakeView(Context context, AttributeSet attrs) {
super(context, attrs);
// 构造时初始化
initSnakeView();
public SnakeView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
initSnakeView();
private void initSnakeView() {
// 可选焦点
setFocusable(true);
Resources r = this.getContext().getResources();
// 设置贴片图片数组
resetTiles(4);
// 把三种图片存到Bitmap对象数组
loadTile(RED_STAR, r.getDrawable(R.drawable.redstar));
loadTile(YELLOW_STAR, r.getDrawable(R.drawable.yellowstar));
loadTile(GREEN_STAR, r.getDrawable(R.drawable.greenstar));
// 开始新的游戏——初始化
private void initNewGame() {
// 清空ArrayList列表
mSnakeTrail.clear();
mAppleList.clear();
// For now we're just going to load up a short default eastbound snake
// that's just turned north
// 创建蛇身
mSnakeTrail.add(new Coordinate(7, 7));
mSnakeTrail.add(new Coordinate(6, 7));
mSnakeTrail.add(new Coordinate(5, 7));
mSnakeTrail.add(new Coordinate(4, 7));
mSnakeTrail.add(new Coordinate(3, 7));
mSnakeTrail.add(new Coordinate(2, 7));
// 新的方向 :北方
mNextDirection = NORTH;
// 2个随机位置的苹果
addRandomApple();
addRandomApple();
// 移动延迟
mMoveDelay = 600;
// 初始得分0
mScore = 0;
* Given a ArrayList of coordinates, we need to flatten them into an array
* of ints before we can stuff them into a map for flattening and storage.
* @param cvec
: a ArrayList of Coordinate objects
* @return : a simple array containing the x/y values of the coordinates as
[x1,y1,x2,y2,x3,y3...]
// 坐标数组转整数数组,把Coordinate对象的x y放到一个int数组中——用来保存状态
private int[] coordArrayListToArray(ArrayList&Coordinate& cvec) {
int count = cvec.size();
int[] rawArray = new int[count * 2];
for (int index = 0; index & index++) {
Coordinate c = cvec.get(index);
rawArray[2 * index] = c.x;
rawArray[2 * index + 1] = c.y;
return rawA
* Save game state so that the user does not lose anything if the game
* process is killed while we are in the background.
* @return a Bundle with this view's state
// 保存状态
public Bundle saveState() {
Bundle map = new Bundle();
map.putIntArray("mAppleList", coordArrayListToArray(mAppleList));
map.putInt("mDirection", Integer.valueOf(mDirection));
map.putInt("mNextDirection", Integer.valueOf(mNextDirection));
map.putLong("mMoveDelay", Long.valueOf(mMoveDelay));
map.putLong("mScore", Long.valueOf(mScore));
map.putIntArray("mSnakeTrail", coordArrayListToArray(mSnakeTrail));
* Given a flattened array of ordinate pairs, we reconstitute them into a
* ArrayList of Coordinate objects
* @param rawArray
: [x1,y1,x2,y2,...]
* @return a ArrayList of Coordinates
// 整数数组转坐标数组,把一个int数组中的x y放到Coordinate对象数组中——用来恢复状态
private ArrayList&Coordinate& coordArrayToArrayList(int[] rawArray) {
ArrayList&Coordinate& coordArrayList = new ArrayList&Coordinate&();
int coordCount = rawArray.
for (int index = 0; index & coordC index += 2) {
Coordinate c = new Coordinate(rawArray[index], rawArray[index + 1]);
coordArrayList.add(c);
return coordArrayL
* Restore game state if our process is being relaunched
* @param icicle
a Bundle containing the game state
// 恢复状态
public void restoreState(Bundle icicle) {
setMode(PAUSE);
mAppleList = coordArrayToArrayList(icicle.getIntArray("mAppleList"));
mDirection = icicle.getInt("mDirection");
mNextDirection = icicle.getInt("mNextDirection");
mMoveDelay = icicle.getLong("mMoveDelay");
mScore = icicle.getLong("mScore");
mSnakeTrail = coordArrayToArrayList(icicle.getIntArray("mSnakeTrail"));
* handles key events in the game. Update the direction our snake is
* traveling based on the DPAD. Ignore events that would cause the snake to
* immediately turn back on itself.
* (non-Javadoc)
* @see android.view.View#onKeyDown(int, android.os.KeyEvent)
// 监听用户键盘操作,并处理这些操作
// 按键事件处理,确保贪吃蛇只能90度转向,而不能180度转向
public boolean onKeyDown(int keyCode, KeyEvent msg) {
if (keyCode == KeyEvent.KEYCODE_DPAD_UP) {
// 准备状态或者失败状态时
if (mMode == READY | mMode == LOSE) {
* At the beginning of the game, or the end of a previous one,
* we should start a new game.
// 初始化游戏
initNewGame();
// 设置游戏状态为运行
setMode(RUNNING);
return (true);
// 暂停状态时
if (mMode == PAUSE) {
* If the game is merely paused, we should just continue where
* we left off.
// 设置成运行状态
setMode(RUNNING);
return (true);
// 如果是运行状态时,如果方向原有方向不是向南,那么方向转向北
if (mDirection != SOUTH) {
mNextDirection = NORTH;
return (true);
if (keyCode == KeyEvent.KEYCODE_DPAD_DOWN) {
// 原方向不是向上时,方向转向南
if (mDirection != NORTH) {
mNextDirection = SOUTH;
return (true);
if (keyCode == KeyEvent.KEYCODE_DPAD_LEFT) {
// 原方向不是向右时,方向转向西
if (mDirection != EAST) {
mNextDirection = WEST;
return (true);
if (keyCode == KeyEvent.KEYCODE_DPAD_RIGHT) {
// 原方向不是向左时,方向转向东
if (mDirection != WEST) {
mNextDirection = EAST;
return (true);
// 按其他键时按原有功能返回
return super.onKeyDown(keyCode, msg);
* Sets the TextView that will be used to give information (such as "Game
* Over" to the user.
* @param newView
// 设置状态显示View
public void setTextView(TextView newView) {
mStatusText = newV
* Updates the current mode of the application (RUNNING or PAUSED or the
* like) as well as sets the visibility of textview for notification
* @param newMode
// 设置游戏状态
public void setMode(int newMode) {
// 把当前游戏状态存入oldMode
int oldMode = mM
// 把游戏状态设置为新状态
mMode = newM
// 如果新状态是运行状态,且原有状态为不运行,那么就开始游戏
if (newMode == RUNNING & oldMode != RUNNING) {
// 设置mStatusTextView隐藏
mStatusText.setVisibility(View.INVISIBLE);
Resources res = getContext().getResources();
CharSequence str = "";
// 如果新状态是暂停状态,那么设置文本内容为暂停内容
if (newMode == PAUSE) {
str = res.getText(R.string.mode_pause);
// 如果新状态是准备状态,那么设置文本内容为准备内容
if (newMode == READY) {
str = res.getText(R.string.mode_ready);
// 如果新状态时失败状态,那么设置文本内容为失败内容
if (newMode == LOSE) {
// 把上轮的得分显示出来
str = res.getString(R.string.mode_lose_prefix) + mScore
+ res.getString(R.string.mode_lose_suffix);
// 设置文本
mStatusText.setText(str);
// 显示该View
mStatusText.setVisibility(View.VISIBLE);
* Selects a random location within the garden that is not currently covered
* by the snake. Currently _could_ go into an infinite loop if the snake
* currently fills the garden, but we'll leave discovery of this prize to a
* truly excellent snake-player.
// 添加苹果
private void addRandomApple() {
// 新的坐标
Coordinate newCoord =
// 防止新苹果出席在蛇身下
boolean found =
// 没有找到合适的苹果,就在循环体内一直循环,直到找到合适的苹果
while (!found) {
// 为苹果再找一个坐标,先随机一个X值
int newX = 1 + RNG.nextInt(mXTileCount - 2);
// 再随机一个Y值
int newY = 1 + RNG.nextInt(mYTileCount - 2);
newCoord = new Coordinate(newX, newY);
// Make sure it's not already under the snake
// 确保新苹果不在蛇身下,先假设没有发生冲突
boolean collision =
int snakelength = mSnakeTrail.size();
// 和蛇占据的所有坐标比较
for (int index = 0; index & index++) {
// 只要和蛇占据的任何一个坐标相同,即认为发生冲突了
if (mSnakeTrail.get(index).equals(newCoord)) {
collision =
// if we're here and there's been no collision, then we have
// a good location for an apple. Otherwise, we'll circle back
// and try again
// 如果有冲突就继续循环,如果没冲突flag的值就是false,那么自然会退出循环,新坐标也就诞生了
if (newCoord == null) {
Log.e(TAG, "Somehow ended up with a null newCoord!");
// 生成一个新苹果放在苹果列表中(两个苹果有可能会重合——这时候虽然看到的是一个苹果,但是呢,分数就是两个分数。)
mAppleList.add(newCoord);
* Handles the basic update loop, checking to see if we are in the running
* state, determining if a move should be made, updating the snake's
* location.
// 更新 各种动作,特别是 贪吃蛇 的位置, 还包括:墙、苹果等的更新
public void update() {
// 如果是处于运行状态
if (mMode == RUNNING) {
long now = System.currentTimeMillis();
// 如果当前时间距离最后一次移动的时间超过了延迟时间
if (now - mLastMove & mMoveDelay) {
clearTiles();
updateWalls();
updateSnake();
updateApples();
mLastMove =
// Handler 会话进程sleep一个延迟时间单位
mRedrawHandler.sleep(mMoveDelay);
* Draws some walls.
private void updateWalls() {
for (int x = 0; x & mXTileC x++) {
// 给上边线的每个贴片位置设置一个绿色索引标识
setTile(GREEN_STAR, x, 0);
// 给下边线的每个贴片位置设置一个绿色索引标识
setTile(GREEN_STAR, x, mYTileCount - 1);
for (int y = 1; y & mYTileCount - 1; y++) {
// 给左边线的每个贴片位置设置一个绿色索引标识
setTile(GREEN_STAR, 0, y);
// 给右边线的每个贴片位置设置一个绿色索引标识
setTile(GREEN_STAR, mXTileCount - 1, y);
* Draws some apples.
// 更新苹果
private void updateApples() {
for (Coordinate c : mAppleList) {
setTile(YELLOW_STAR, c.x, c.y);
* Figure out which way the snake is going, see if he's run into anything
* (the walls, himself, or an apple). If he's not going to die, we then add
* to the front and subtract from the rear in order to simulate motion. If
* we want to grow him, we don't subtract from the rear.
private void updateSnake() {
// 生长标志
boolean growSnake =
// 得到蛇头坐标
Coordinate head = mSnakeTrail.get(0);
// 初始化一个新的蛇头坐标
Coordinate newHead = new Coordinate(1, 1);
// 当前方向改成新的方向
mDirection = mNextD
// 根据方向确定蛇头新坐标
switch (mDirection) {
// 如果方向向东(右),那么X加1
case EAST: {
newHead = new Coordinate(head.x + 1, head.y);
// 如果方向向西(左),那么X减1
case WEST: {
newHead = new Coordinate(head.x - 1, head.y);
// 如果方向向北(上),那么Y减1
case NORTH: {
newHead = new Coordinate(head.x, head.y - 1);
// 如果方向向南(下),那么Y加1
case SOUTH: {
newHead = new Coordinate(head.x, head.y + 1);
// Collision detection
// For now we have a 1-square wall around the entire arena
// 冲突检测 新蛇头是否四面墙重叠,那么游戏结束
if ((newHead.x & 1) || (newHead.y & 1) || (newHead.x & mXTileCount - 2)
|| (newHead.y & mYTileCount - 2)) {
// 设置游戏状态为Lose
setMode(LOSE);
// Look for collisions with itself
// 冲突检测 新蛇头是否和自身坐标重叠,重叠的话游戏也结束
int snakelength = mSnakeTrail.size();
for (int snakeindex = 0; snakeindex & snakeindex++) {
Coordinate c = mSnakeTrail.get(snakeindex);
if (c.equals(newHead)) {
// 设置游戏状态为Lose
setMode(LOSE);
// Look for apples
// 看新蛇头和苹果们是否重叠
int applecount = mAppleList.size();
for (int appleindex = 0; appleindex & appleindex++) {
Coordinate c = mAppleList.get(appleindex);
if (c.equals(newHead)) {
// 如果重叠,苹果坐标从苹果列表中移除
mAppleList.remove(c);
// 再立刻增加一个新苹果
addRandomApple();
// 得分加一
// 延迟是以前的90%
mMoveDelay *= 0.9;
// 蛇增长标志改为真
growSnake =
// push a new head onto the ArrayList and pull off the tail
// 在蛇头的位置增加一个新坐标
mSnakeTrail.add(0, newHead);
// except if we want the snake to grow
// 如果没有增长
if (!growSnake) {
// 如果蛇头没增长则删去最后一个坐标,相当于蛇向前走了一步
mSnakeTrail.remove(mSnakeTrail.size() - 1);
int index = 0;
// 重新设置一下颜色,蛇头是黄色的(同苹果一样),蛇身是红色的
for (Coordinate c : mSnakeTrail) {
if (index == 0) {
setTile(YELLOW_STAR, c.x, c.y);
setTile(RED_STAR, c.x, c.y);
* Simple class containing two integer values and a comparison function.
* There's probably something I should use instead, but this was quick and
* easy to build.
// 坐标内部类——原作者说这是临时做法
private class Coordinate {
// 构造函数
public Coordinate(int newX, int newY) {
// 重写equals
public boolean equals(Coordinate other) {
if (x == other.x && y == other.y) {
// 重写toString
public String toString() {
return "Coordinate: [" + x + "," + y + "]";
3、 TileView.java  /**
* &p&Title: Snake&/p&
* &p&Copyright: (C) 2007 The Android Open Source Project. Licensed under the Apache License, Version 2.0 (the "License")&/p&
* @author Gavin 标注
package com.deaboway.
import android.content.C
import android.content.res.TypedA
import android.graphics.B
import android.graphics.C
import android.graphics.P
import android.graphics.drawable.D
import android.util.AttributeS
import android.view.V
* TileView: a View-variant designed for handling arrays of "icons" or other
* drawables.
// View 变种,用来处理 一组 贴片—— “icons”或其它可绘制的对象
public class TileView extends View {
* Parameters controlling the size of the tiles and their range within view.
* Width/Height are in pixels, and Drawables will be scaled to fit to these
* dimensions. X/Y Tile Counts are the number of tiles that will be drawn.
protected static int mTileS
// X轴的贴片数量
protected static int mXTileC
// Y轴的贴片数量
protected static int mYTileC
// X偏移量
private static int mXO
// Y偏移量
private static int mYO
* A hash that maps integer handles specified by the subclasser to the
* drawable that will be used for that reference
// 贴片图像的图像数组
private Bitmap[] mTileA
* A two-dimensional array of integers in which the number represents the
* index of the tile that should be drawn at that locations
// 保存每个贴片的索引——二维数组
private int[][] mTileG
// Paint对象(画笔、颜料)
private final Paint mPaint = new Paint();
// 构造函数
public TileView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
TypedArray a = context.obtainStyledAttributes(attrs,
R.styleable.TileView);
mTileSize = a.getInt(R.styleable.TileView_tileSize, 12);
a.recycle();
public TileView(Context context, AttributeSet attrs) {
super(context, attrs);
TypedArray a = context.obtainStyledAttributes(attrs,
R.styleable.TileView);
mTileSize = a.getInt(R.styleable.TileView_tileSize, 12);
a.recycle();
* Rests the internal array of Bitmaps used for drawing tiles, and sets the
* maximum index of tiles to be inserted
* @param tilecount
// 设置贴片图片数组
public void resetTiles(int tilecount) {
mTileArray = new Bitmap[tilecount];
// 回调:当该View的尺寸改变时调用,在onDraw()方法调用之前就会被调用,所以用来设置一些变量的初始值
// 在视图大小改变的时候调用,比如说手机由垂直旋转为水平
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
// 定义X轴贴片数量
mXTileCount = (int) Math.floor(w / mTileSize);
mYTileCount = (int) Math.floor(h / mTileSize);
// X轴偏移量
mXOffset = ((w - (mTileSize * mXTileCount)) / 2);
// Y轴偏移量
mYOffset = ((h - (mTileSize * mYTileCount)) / 2);
// 定义贴片的二维数组
mTileGrid = new int[mXTileCount][mYTileCount];
// 清空所有贴片
clearTiles();
* Function to set the specified Drawable as the tile for a particular
* integer key.
* @param key
* @param tile
// 给mTileArray这个Bitmap图片数组设置值
public void loadTile(int key, Drawable tile) {
Bitmap bitmap = Bitmap.createBitmap(mTileSize, mTileSize,
Bitmap.Config.ARGB_8888);
Canvas canvas = new Canvas(bitmap);
tile.setBounds(0, 0, mTileSize, mTileSize);
// 把一个drawable转成一个Bitmap
tile.draw(canvas);
// 在数组里存入该Bitmap
mTileArray[key] =
* Resets all tiles to 0 (empty)
// 清空所有贴片
public void clearTiles() {
for (int x = 0; x & mXTileC x++) {
for (int y = 0; y & mYTileC y++) {
// 全部设置为0
setTile(0, x, y);
* Used to indicate that a particular tile (set with loadTile and referenced
* by an integer) should be drawn at the given x/y coordinates during the
* next invalidate/draw cycle.
* @param tileindex
* @param x
* @param y
// 给某个贴片位置设置一个状态索引
public void setTile(int tileindex, int x, int y) {
mTileGrid[x][y] =
// onDraw 在视图需要重画的时候调用,比如说使用invalidate刷新界面上的某个矩形区域
public void onDraw(Canvas canvas) {
super.onDraw(canvas);
for (int x = 0; x & mXTileC x += 1) {
for (int y = 0; y & mYTileC y += 1) {
// 当索引大于零,也就是不空时
if (mTileGrid[x][y] & 0) {
// mTileGrid中不为零时画此贴片
canvas.drawBitmap(mTileArray[mTileGrid[x][y]], mXOffset + x
* mTileSize, mYOffset + y * mTileSize, mPaint);
四、工程文件下载为了方便大家阅读,可以到如下地址下载工程源代码:五、小结及下期预告:本次详细解析了 Android SDK 自带 Sample—— Snake的结构和功能。下次将会把这个游戏移植到 J2ME平台上,并且比较 Android和 J2ME的区别和相通之处,让从事过 J2ME开发的朋友对 Android开发有个更加直观的认识。
  楼主很细心啊,对贪食蛇游戏进行了详细的分析...居然不能打shou,cang,了rock0rollzt & &
& & (0)(0)  greyfox4488 写道  kill_all 写道  从设计思路,到建模,可以当作一个典型的andriod入门教学实例Google 的 API Demo...本来就是让你当作一个典型的andriod入门教学实例的...的确是android入门教学实例,但是楼主能做如此细致的分析,并分享出来.精神可嘉.rock0roll & &
& & (0)(0)  不顶不行啊! 让咱们初学者有个更加直观的了解!rock_1125 & &
& & (0)(0)  谢谢 楼主& 正在学习这个rock141 & &
& & (0)(0)  感谢LZ,好贴rock0rollzt & &
& & (0)(0)  一直就想着能有个人给讲解一下这个例子,结果楼主你就做了,感谢啊rock141 & &
& & (0)(0)  感谢楼主,正在学习中。xksyuan & &
& & (0)(0)  楼主,多谢了,正是我需要的xksongoo & &
& & (0)(0)  wjb_forward 写道  一直就想着能有个人给讲解一下这个例子,结果楼主你就做了,感谢啊呵呵,缘分啊。。。 xkq733794 & &
& & (0)(0)  zan yige
xkszltl & &
& & (0)(0)  谢谢分享!xkrong & &
& & (0)(0)  呵呵,很好的帖子,我没有做j2me,不知android下的这个游戏和j2me下相同的游戏,那个性能更好些,期待与你交流xkq1965 & &
& & (0)(0)  en ,感觉还不错xkq733794 & &
& & (0)(0)  public class Dingyige{
Public static void main(String [] arg){
System.out.println("楼主辛苦了");
}xkq521 & &
& & (0)(0)  受益匪浅,入门的经典,谢谢xksyuan & &
& & (0)(0)  android刚入门,值得看看xksongoo & &
& & (0)(0)  楼主你好,看了你对于贪吃蛇的代码的讲述,我受益匪浅,非常感谢楼主可以奉献出来帮助新人。不过我有一个疑问,希望可以得到楼主的解答。楼主的运行效果图的第一张应该是点击“上”之后开始初始化的界面,我的疑问就在这里。我也做了一个测试,这是创建蛇身的第一个代码,也就是蛇头,mSnakeTrail.add(new Coordinate(7, 7)); 默认的方向是北方,而 运行出来是黄色的蛇头的坐标明显不是(7,7)而是(7,5)。为了进一步验证,我将创建蛇身的代码就只保留了这一句,也就是只创建一个蛇头,当当next方向为北时,蛇头坐标为(7,5),next方向为南时,蛇头方向为(7,9),next方向为东时,蛇头方向为(9,7),next方向为西时,蛇头坐标为(5,7)。很明显,在游戏开始时,蛇头已经朝next方向前进了两个单位。请问楼主这是为什么呢?该怎么解释这一现象呢?希望可以得到楼主的回复,祝您工作愉快!xkq733794 & &
& & (0)(0)  是因为我的问题在第三页,没有被楼主看到吗?谁来帮忙解决一下这个问题啊!!!xksyuan & &
& & (0)(0)  追梦人21 写道  是因为我的问题在第三页,没有被楼主看到吗?谁来帮忙解决一下这个问题啊!!!你很认真哦,最近有点小忙,刚看到。请注意:&&& // 更新蛇& &&& private void updateSnake() {& &&&&&&& // 生长标志& &&&&&&& boolean growSnake =& & &&&&&&& // 得到蛇头坐标& &&&&&&& Coordinate head = mSnakeTrail.get(0);& &&&&&&& // 初始化一个新的蛇头坐标& &&&&&&& Coordinate newHead = new Coordinate(1, 1);& & &&&&&&& // 当前方向改成新的方向& &&&&&&& mDirection = mNextD& 当你按向上键的时候,其实新的蛇头已经产生了,所以,你会看到新的蛇头不是原来的蛇头。xksylj & &
& & (0)(0)  是个很好的例子,马上入门!xkszltl & &
& & (0)(0)
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