[java] view plain copy
// MainActivity.java 
package con.example.wang.game; 
public class MainActivity extends Activity implements OnClickListener{ 
  Button button; 
  EditText edit1,edit2; 
  CheckBox checkbox; 
  ProgressBar bar; 
  SharedPreferences pref; 
  SharedPreferences.Editor editor; 
  @Override 
  protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_main); 
    button=(Button) findViewById(R.id.login_button); 
    edit1=(EditText) findViewById(R.id.input1); 
    edit2=(EditText) findViewById(R.id.input2); 
    checkbox=(CheckBox) findViewById(R.id.remember_button); 
    bar=(ProgressBar) findViewById(R.id.progress); 
    pref= PreferenceManager.getDefaultSharedPreferences(this); 
    boolean isRemember=pref.getBoolean("rem",false);   //獲取代表是否保存密碼的變量值，這里初值設(shè)為false 
 
    if(isRemember) { 
      //如果記住密碼，則將賬號(hào)和密碼自動(dòng)填充到文本框中 
      String account=pref.getString("account",""); 
      String password=pref.getString("password",""); 
      edit1.setText(account); 
      edit2.setText(password); 
      checkbox.setChecked(true); 
    } 
    button.setOnClickListener(this); 
  } 
  @Override 
  public void onClick(View v){ 
    new Thread(new Runnable(){   //開啟線程運(yùn)行進(jìn)度條，減少主線程的壓力，這里不用子線程也影響不大 
      @Override 
      public void run() { 
        for (int i = 0; i < 25; i++) { 
          int progress = bar.getProgress(); 
          progress = progress + 10; 
          bar.setProgress(progress); 
        } 
      } 
    }).start(); 
 
    String account=edit1.getText().toString(); 
    String password=edit2.getText().toString(); 
    if(account.equals("admin") && password.equals("123456")) { 
      editor = pref.edit();  //這個(gè)方法用于向SharedPreferences文件中寫數(shù)據(jù) 
      if(checkbox.isChecked()) { 
        editor.putBoolean("rem",true); 
        editor.putString("account",account); 
        editor.putString("password",password); 
      } 
      else { 
        editor.clear(); 
      } 
      editor.commit();  //這個(gè)方法必須要有，不然數(shù)據(jù)不會(huì)被保存。生效后，就可以從該文件中讀取數(shù)據(jù)。 
      Intent intent=new Intent(MainActivity.this,SecondActivity.class); 
      startActivity(intent); 
    } 
    else{  //如果用戶名或密碼不正確，這里會(huì)彈出一個(gè)提示框 
      Toast.makeText(MainActivity.this,"賬號(hào)或用戶名錯(cuò)誤",Toast.LENGTH_SHORT).show(); 
    } 
  } 
} 

[java] view plain copy
// SecondActivity.java 
package com.example.wang.game; 
public class SecondActivity extends Activity implements OnClickListener{ 
 
  ImageButton button1,button2,button3,button4; 
  @Override 
  protected void onCreate(Bundle savedInstanceState){ 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_second); 
    button1=(ImageButton) findViewById(R.id.button_start); 
    button2=(ImageButton) findViewById(R.id.button_difficulty); 
    button3=(ImageButton) findViewById(R.id.button_music); 
    button4=(ImageButton) findViewById(R.id.button_about); 
    button4.setOnClickListener(this); 
    button3.setOnClickListener(this); 
    button2.setOnClickListener(this); 
    button1.setOnClickListener(this); 
  } 
  @Override 
  public void onClick(View v){ 
    switch(v.getId()) {    //看下Intent的用法，還是挺方便的，這里用的都是顯式的方法 
      case R.id.button_about: 
        Intent intent1 = new Intent(SecondActivity.this, AboutActivity.class); 
        startActivity(intent1); 
        break; 
      case R.id.button_music: 
        Intent intent2 = new Intent(SecondActivity.this, MusicActivity.class); 
        startActivity(intent2); 
        break; 
      case R.id.button_difficulty: 
        Intent intent3 = new Intent(SecondActivity.this, DifficultyActivity.class); 
        startActivity(intent3); 
        break; 
      case R.id.button_start: 
        Intent intent4 = new Intent(SecondActivity.this, GameActivity.class); 
        startActivity(intent4); 
        break; 
      default: 
        break; 
    } 
  } 
} 

[java] view plain copy
// DifficultyActivity.java 
package com.example.wang.game; 
public class DifficultyActivity extends Activity implements OnClickListener{ 
  private SharedPreferences saved; 
  private SharedPreferences.Editor editor; 
 
  RadioButton button_jiandan,button_yiban,button_kunnan; 
  @Override 
  protected void onCreate(Bundle savedInstanceState){ 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_difficulty); 
    saved = PreferenceManager.getDefaultSharedPreferences(this); 
    int level = saved.getInt("nandu",500); 
 
    button_jiandan = (RadioButton) findViewById(R.id.button_difficulty1); 
    button_yiban = (RadioButton) findViewById(R.id.button_difficulty2); 
    button_kunnan = (RadioButton) findViewById(R.id.button_difficulty3); 
    button_jiandan.setOnClickListener(this); 
    button_yiban.setOnClickListener(this); 
    button_kunnan.setOnClickListener(this); 
  } 
  @Override 
  public void onClick(View v){ 
    editor=saved.edit(); 
    switch(v.getId()){ 
      case R.id.button_difficulty1: 
        if(button_jiandan.isChecked()){ 
          editor.putInt("nandu",500); 
        } 
        break; 
      case R.id.button_difficulty2: 
        if(button_yiban.isChecked()){ 
          editor.putInt("nandu",200); 
        } 
        break; 
      case R.id.button_difficulty3: 
        if(button_kunnan.isChecked()){ 
          editor.putInt("nandu",100); 
        } 
        break; 
    } 
    editor.commit(); 
  } 
} 

[java] view plain copy
// TileView.java 
package com.example.wang.game; 
public class TileView extends View { 
  public static int mTileSize =32; 
  public static int mXTileCount; //地圖上所能容納的格數(shù) 
  public static int mYTileCount; 
  public static int mXOffset;   //偏移量 
  public static int mYOffset; 
  Bitmap[] mTileArray;      //放置圖片的數(shù)組 
  int[][] mTileGrid;       //存放各坐標(biāo)對(duì)應(yīng)的圖片 
 
  public TileView(Context context, AttributeSet attrs,int defStyle){ 
    super(context,attrs,defStyle); 
  } 
  public TileView(Context context, AttributeSet attrs){ 
    super(context,attrs); 
  } 
  public TileView(Context context){ 
    super(context); 
  } 
  //加載三幅小圖片 
  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); 
    tile.draw(canvas); 
    mTileArray[key] = bitmap; 
  } 
  //給地圖數(shù)組賦值 
  public void setTile(int tileindex, int x, int y) { 
    mTileGrid[x][y] = tileindex; 
  } 
  public void resetTiles(int tilecount) { 
    mTileArray = new Bitmap[tilecount]; 
  } 
  //我的游戲界面不是占滿整個(gè)屏幕，所以地圖遍歷的時(shí)候，y不是從0開始 
  public void clearTiles() { 
    for (int x = 0; x < mXTileCount; x++) { 
      for (int y = 2; y < mYTileCount-8; y++) { 
        setTile(0, x, y); 
      } 
    } 
  } 
  //計(jì)算當(dāng)前屏幕在X,Y軸上分別所能容納的最大磚塊數(shù)量 
  //這里輸出</span><span style="font-size:14px;">“mXTileCount"和”mYTileCount"的值后面會(huì)用到 
  @Override 
  public void onSizeChanged(int w, int h, int oldw, int oldh){ 
    //地圖數(shù)組初始化 
    mXTileCount = (int) Math.floor(w / mTileSize); 
    mYTileCount = (int) Math.floor(h / mTileSize); 
//    System.out.println("-------"+mXTileCount+"----------"); 
//    System.out.println("-------"+mYTileCount+"----------"); 
    //可能屏幕的長(zhǎng)寬不能整除，所以夠分成一格的分成一格, 剩下不夠一格的分成兩份,左邊一份,右邊一份 
    mXOffset = ((w - (mTileSize * mXTileCount)) / 2); 
    mYOffset = ((h - (mTileSize * mYTileCount)) / 2); 
//    System.out.println("-------"+mXOffset+"----------"); 
//    System.out.println("-------"+mYOffset+"----------"); 
    mTileGrid = new int[mXTileCount][mYTileCount]; 
    clearTiles(); 
  } 
  @Override 
  public void onDraw(Canvas canvas){ 
    super.onDraw(canvas); 
  } 
} 

[java] view plain copy
// SnakeView.java 
package com.example.wang.game; 
public class SnakeView extends TileView{ 
 
  static int mMoveDelay = 500; 
  private long mLastMove; 
 
  private static final int RED_STAR = 1; 
  private static final int YELLOW_STAR = 2; 
  private static final int GREEN_STAR = 3; 
 
  private static final int UP = 1; 
  private static final int DOWN = 2; 
  private static final int RIGHT = 3; 
  private static final int LEFT = 4; 
  static int mDirection = RIGHT; 
  static int mNextDirection = RIGHT; 
  // 這里把游戲界面分為5種狀態(tài)，便于邏輯實(shí)現(xiàn) 
  public static final int PAUSE = 0; 
  public static final int READY = 1; 
  public static final int RUNNING = 2; 
  public static final int LOSE = 3; 
  public static final int QUIT = 4; 
  public int mMode = READY; 
  public int newMode; 
 
  private TextView mStatusText;  // 用于每個(gè)狀態(tài)下的文字提醒 
  public long mScore = 0; 
 
  private ArrayList<Coordinate> mSnakeTrail = new ArrayList<Coordinate>(); // 存儲(chǔ)蛇的所有坐標(biāo)的數(shù)組 
  private ArrayList<Coordinate> mAppleList = new ArrayList<Coordinate>(); // 存儲(chǔ)蘋果的所有坐標(biāo)的數(shù)組 
 
  private static final Random RNG = new Random();  //用于生成蘋果坐標(biāo)的隨機(jī)數(shù) 
//  private static final String TAG = "SnakeView"; 
 
  //開啟線程，不斷調(diào)用更新和重繪。這里利用了Handler類來實(shí)現(xiàn)異步消息處理機(jī)制 
  MyHandler handler=new MyHandler(); 
  class MyHandler extends Handler{ 
    @Override 
    public void handleMessage(Message msg) { 
      SnakeView.this.update();     //不斷調(diào)用update()方法 
      SnakeView.this.invalidate();  //請(qǐng)求重繪，不斷調(diào)用ondraw()方法 
    } 
    //調(diào)用sleep后,在一段時(shí)間后再sendmessage進(jìn)行UI更新 
    public void sleep(int delayMillis) { 
      this.removeMessages(0);     //清空消息隊(duì)列 
      sendMessageDelayed(obtainMessage(0), delayMillis); 
    } 
  } 
  //這是三個(gè)構(gòu)造方法，別忘了加上下面這個(gè)初始化方法 
  public SnakeView(Context context, AttributeSet attrs, int defStyle){ 
    super(context,attrs,defStyle); 
    initNewGame(); 
  } 
  public SnakeView(Context context, AttributeSet attrs){ 
    super(context,attrs); 
    setFocusable(true); 
    initNewGame(); 
  } 
  public SnakeView(Context context){ 
    super(context); 
  } 
  //添加蘋果的方法，最后將生成的蘋果坐標(biāo)存儲(chǔ)在上面定義的數(shù)組中 
  private void addRandomApple() { 
    Coordinate newCoord = null; 
    boolean found = false; 
    while (!found) { 
      // 這里設(shè)定了蘋果坐標(biāo)能隨機(jī)生成的范圍，并生成隨機(jī)坐標(biāo)。這里Google源碼中是直接使用變量 
      // mXTileCount和mYTileCount，我編譯時(shí)會(huì)報(bào)錯(cuò)，因?yàn)殡S機(jī)數(shù)不能生成負(fù)數(shù)，而直接使用這兩個(gè)變量程序不能 
      // 識(shí)別這個(gè)變量減去一個(gè)數(shù)后是否會(huì)是負(fù)數(shù)，所以我把TileView里輸出的確切值放了進(jìn)去 
      int newX = 1 + RNG.nextInt(24-2); 
      int newY = 3 + RNG.nextInt(35-12); 
      newCoord = new Coordinate(newX, newY); 
 
      boolean collision = false; 
      int snakelength = mSnakeTrail.size(); 
      //遍歷snake, 看新添加的apple是否在snake體內(nèi), 如果是,重新生成坐標(biāo) 
      for (int index = 0; index < snakelength; index++) { 
        if (mSnakeTrail.get(index).equals(newCoord)) { 
          collision = true; 
        } 
      } 
      found = !collision; 
    } 
//    if (newCoord == null) { 
//      Log.e(TAG, "Somehow ended up with a null newCoord!"); 
//    } 
    mAppleList.add(newCoord); 
  } 
 
  //繪制邊界的墻 
  private void updateWalls() { 
    for (int x = 0; x < mXTileCount; x++) { 
      setTile(GREEN_STAR, x, 2); 
      setTile(GREEN_STAR, x, mYTileCount - 8); 
    } 
    for (int y = 2; y < mYTileCount - 8; y++) { 
      setTile(GREEN_STAR, 0, y); 
      setTile(GREEN_STAR, mXTileCount - 1, y); 
    } 
  } 
  //更新蛇的運(yùn)動(dòng)軌跡 
  private void updateSnake(){ 
    boolean growSnake = false; 
    Coordinate head = mSnakeTrail.get(0); 
    Coordinate newHead = new Coordinate(1, 1); 
 
    mDirection = mNextDirection; 
    switch (mDirection) { 
      case RIGHT: { 
        newHead = new Coordinate(head.x + 1, head.y); 
        break; 
      } 
      case LEFT: { 
        newHead = new Coordinate(head.x - 1, head.y); 
        break; 
      } 
      case UP: { 
        newHead = new Coordinate(head.x, head.y - 1); 
        break; 
      } 
      case DOWN: { 
        newHead = new Coordinate(head.x, head.y + 1); 
        break; 
      } 
    } 
    //檢測(cè)是否撞墻 
    if ((newHead.x < 1) || (newHead.y < 3) || (newHead.x > mXTileCount - 2) 
        || (newHead.y > mYTileCount - 9)) { 
      setMode(LOSE); 
      return; 
    } 
    //檢測(cè)蛇頭是否撞到自己 
    int snakelength = mSnakeTrail.size(); 
    for (int snakeindex = 0; snakeindex < snakelength; snakeindex++) { 
      Coordinate c = mSnakeTrail.get(snakeindex); 
      if (c.equals(newHead)) { 
        setMode(LOSE); 
        return; 
      } 
    } 
    //檢測(cè)蛇是否吃到蘋果 
    int applecount = mAppleList.size(); 
    for (int appleindex = 0; appleindex < applecount; appleindex++) { 
      Coordinate c = mAppleList.get(appleindex); 
      if (c.equals(newHead)) { 
        mAppleList.remove(c); 
        addRandomApple(); 
        mScore++; 
        mMoveDelay *= 0.95;  //蛇每遲到一個(gè)蘋果，延時(shí)就會(huì)減少，蛇的速度就會(huì)加快 
        growSnake = true; 
      } 
    } 
    mSnakeTrail.add(0,newHead); 
    if(!growSnake) { 
      mSnakeTrail.remove(mSnakeTrail.size() - 1); 
    } 
    //蛇頭和蛇身分別設(shè)置不同的圖片 
    int index=0; 
    for(Coordinate c:mSnakeTrail) { 
      if(index == 0) { 
        setTile(RED_STAR, c.x, c.y); 
      } else { 
        setTile(YELLOW_STAR,c.x,c.y); 
      } 
      index++; 
    } 
  } 
  給蘋果加載對(duì)應(yīng)的圖片 
  private void updateApples() { 
    for (Coordinate c : mAppleList) { 
      setTile(YELLOW_STAR, c.x, c.y); 
    } 
  } 
  // 該方法很重要，用于更新蛇，蘋果和墻的坐標(biāo) 
  // 這里設(shè)置了更新的時(shí)間間隔，我發(fā)現(xiàn)不加這個(gè)延時(shí)的話蛇運(yùn)動(dòng)時(shí)容易出現(xiàn)一下跳很多格的情況 
   public void update(){ 
    if(mMode == RUNNING) { 
      long now = System.currentTimeMillis(); 
      if (now - mLastMove > mMoveDelay) { 
        clearTiles(); 
        updateWalls(); 
        updateSnake(); 
        updateApples(); 
        mLastMove = now; 
      } 
      handler.sleep(mMoveDelay); 
    } 
  } 
 
  //圖像初始化，引入圖片資源 
  private void initSnakeView() { 
    setFocusable(true);   //添加焦點(diǎn) 
    Resources r = this.getContext().getResources(); 
    //添加幾種不同的tile 
    resetTiles(4); 
    //從文件中加載圖片 
    loadTile(RED_STAR, r.getDrawable(R.drawable.redstar)); 
    loadTile(YELLOW_STAR, r.getDrawable(R.drawable.yellowstar)); 
    loadTile(GREEN_STAR, r.getDrawable(R.drawable.greenstar)); 
    update(); 
  } 
  // 數(shù)據(jù)初始化方法，定義蛇的起始坐標(biāo)，運(yùn)動(dòng)方向和得分變量。給數(shù)組添加坐標(biāo)的時(shí)候注意順序，因?yàn)橛猩哳^和蛇尾的區(qū)別 
  public void initNewGame() { 
    mSnakeTrail.clear(); 
    mAppleList.clear(); 
    //snake初始狀態(tài)時(shí)的個(gè)數(shù)和位置,方向 
    mSnakeTrail.add(new Coordinate(8, 7)); 
    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)); 
    mDirection = RIGHT; 
    mNextDirection = RIGHT; // 這個(gè)變量必須初始化，不然每次游戲結(jié)束重新開始后，蛇初始的方向?qū)⒉皇窍蛴?，而是你游戲結(jié)束時(shí)蛇的方向， 
                           // 如果死的時(shí)候，蛇的方向向左，那么再次點(diǎn)擊開始時(shí)會(huì)無法繪出蛇的圖像 
    addRandomApple(); 
    mScore=0; 
  } 
  // 根據(jù)各個(gè)數(shù)組中的數(shù)據(jù)，遍歷地圖設(shè)置各點(diǎn)的圖片 
  public void onDraw(Canvas canvas){ 
    super.onDraw(canvas); 
    Paint paint=new Paint(); 
    initSnakeView(); 
    //遍歷地圖繪制界面 
    for (int x = 0; x < mXTileCount; x++) { 
      for (int y = 0; y < mYTileCount; y++) { 
        if (mTileGrid[x][y] > 0) {  // 被加了圖片的點(diǎn)mTileGird是大于0的 
          canvas.drawBitmap(mTileArray[mTileGrid[x][y]], mXOffset + x * mTileSize, mYOffset + y * mTileSize, paint); 
        } 
      } 
    } 
  } 
 
  //把蛇和蘋果各點(diǎn)對(duì)應(yīng)的坐標(biāo)利用一個(gè)一維數(shù)組儲(chǔ)存起來 
  private int[] coordArrayListToArray(ArrayList<Coordinate> cvec) { 
    int count = cvec.size(); 
    int[] rawArray = new int[count * 2]; 
    for (int index = 0; index < count; index++) { 
      Coordinate c = cvec.get(index); 
      rawArray[2 * index] = c.x; 
      rawArray[2 * index + 1] = c.y; 
    } 
    return rawArray; 
  } 
 
  //將當(dāng)前所有的游戲數(shù)據(jù)全部保存 
  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.putInt("mMoveDelay", Integer.valueOf(mMoveDelay)); 
    map.putLong("mScore", Long.valueOf(mScore)); 
    map.putIntArray("mSnakeTrail", coordArrayListToArray(mSnakeTrail)); 
    return map; 
  } 
  //是coordArrayListToArray()的逆過程，用來讀取數(shù)組中的坐標(biāo)數(shù)據(jù) 
  private ArrayList<Coordinate> coordArrayToArrayList(int[] rawArray) { 
    ArrayList<Coordinate> coordArrayList = new ArrayList<Coordinate>(); 
    int coordCount = rawArray.length; 
    for (int index = 0; index < coordCount; index += 2) { 
      Coordinate c = new Coordinate(rawArray[index], rawArray[index + 1]); 
      coordArrayList.add(c); 
    } 
    return coordArrayList; 
  } 
  //saveState()的逆過程,用于恢復(fù)游戲數(shù)據(jù) 
  public void restoreState(Bundle icicle) { 
    setMode(PAUSE); 
    mAppleList = coordArrayToArrayList(icicle.getIntArray("mAppleList")); 
    mDirection = icicle.getInt("mDirection"); 
    mNextDirection = icicle.getInt("mNextDirection"); 
    mMoveDelay = icicle.getInt("mMoveDelay"); 
    mScore = icicle.getLong("mScore"); 
    mSnakeTrail = coordArrayToArrayList(icicle.getIntArray("mSnakeTrail")); 
  } 
  // 設(shè)置鍵盤監(jiān)聽，在模擬器中可以使用電腦鍵盤控制蛇的方向 
  public boolean onKeyDown(int keyCode, KeyEvent event){ 
    if(keyCode == KeyEvent.KEYCODE_DPAD_UP){ 
      if(mDirection != DOWN) { 
        mNextDirection = UP; 
      } 
      return (true); 
    } 
    if(keyCode == KeyEvent.KEYCODE_DPAD_DOWN){ 
      if(mDirection != UP) { 
        mNextDirection = DOWN; 
      } 
      return (true); 
    } 
    if(keyCode == KeyEvent.KEYCODE_DPAD_RIGHT){ 
      if(mDirection != LEFT) { 
        mNextDirection = RIGHT; 
      } 
      return (true); 
    } 
    if(keyCode == KeyEvent.KEYCODE_DPAD_LEFT){ 
      if(mDirection != RIGHT) { 
        mNextDirection = LEFT; 
      } 
      return (true); 
    } 
    return super.onKeyDown(keyCode,event); 
  } 
 
  public void setTextView(TextView newView) { 
    mStatusText = newView; 
  } 
  // 設(shè)置不同狀態(tài)下提示文字的顯示內(nèi)容和可見狀態(tài) 
  public void setMode(int newMode) { 
    this.newMode=newMode; 
    int oldMode = mMode; 
    mMode = newMode; 
    if (newMode == RUNNING & oldMode != RUNNING) { 
      mStatusText.setVisibility(View.INVISIBLE); 
      update(); 
      return; 
    } 
    // 這里定義了一個(gè)空字符串，用于放入各個(gè)狀態(tài)下的提醒文字 
    Resources res = getContext().getResources(); 
    CharSequence str = ""; 
    if (newMode == PAUSE) { 
      str = res.getText(R.string.mode_pause); 
    } 
    if (newMode == READY) { 
      str = res.getText(R.string.mode_ready); 
    } 
    if (newMode == LOSE) { 
      str = res.getString(R.string.mode_lose_prefix) + mScore 
          + res.getString(R.string.mode_lose_suffix); 
    } 
    if (newMode == QUIT){ 
      str = res.getText(R.string.mode_quit); 
    } 
    mStatusText.setText(str); 
    mStatusText.setVisibility(View.VISIBLE); 
  } 
 
  //記錄坐標(biāo)位置 
  private class Coordinate { 
    public int x; 
    public int y; 
    public Coordinate(int newX, int newY) { 
      x = newX; 
      y = newY; 
    } 
    //觸碰檢測(cè)，看蛇是否吃到蘋果 
    public boolean equals(Coordinate other) { 
      if (x == other.x && y == other.y) { 
        return true; 
      } 
      return false; 
    } 
    // 這個(gè)方法沒研究過起什么作用，我注釋掉對(duì)程序的運(yùn)行沒有影響 
    @Override 
    public String toString() { 
      return "Coordinate: [" + x + "," + y + "]"; 
    } 
  } 
} 

[java] view plain copy
// GameActivity.java 
package com.example.wang.game; 
public class GameActivity extends Activity implements OnClickListener{ 
  private SharedPreferences saved; 
  private static String ICICLE_KEY = "snake-view";  // 個(gè)人認(rèn)為這個(gè)變量就是一個(gè)中間值，在該類的最后一個(gè)方法中傳入該變量，完成操作。 
  private SnakeView mSnakeView; 
  private ImageButton change_stop,change_start,change_quit; 
  private ImageButton mLeft; 
  private ImageButton mRight; 
  private ImageButton mUp; 
  private ImageButton mDown; 
  private static final int UP = 1; 
  private static final int DOWN = 2; 
  private static final int RIGHT = 3; 
  private static final int LEFT = 4; 
 
  @Override 
  protected void onCreate(Bundle savedInstanceState){ 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_game); 
    mSnakeView = (SnakeView) findViewById(R.id.snake); //給自定義View實(shí)例化，把這個(gè)布局當(dāng)一個(gè)UI控件一樣插入進(jìn)來 
    mSnakeView.setTextView((TextView) findViewById(R.id.text_show)); 
 
    change_stop = (ImageButton) findViewById(R.id.game_stop); 
    change_start = (ImageButton) findViewById(R.id.game_start); 
    change_quit = (ImageButton) findViewById(R.id.game_quit); 
 
    mLeft = (ImageButton) findViewById(R.id.left); 
    mRight = (ImageButton) findViewById(R.id.right); 
    mUp = (ImageButton) findViewById(R.id.up); 
    mDown = (ImageButton) findViewById(R.id.down); 
 
    change_start = (ImageButton) findViewById(R.id.game_start); 
    change_stop = (ImageButton) findViewById(R.id.game_stop); 
    change_quit = (ImageButton) findViewById(R.id.game_quit); 
 
    saved = PreferenceManager.getDefaultSharedPreferences(this); 
    boolean playMusic = saved.getBoolean("ifon" ,true);   // 獲取背景音樂開關(guān)的狀態(tài)變量，在設(shè)置開關(guān)界面存儲(chǔ)，在這里讀取 
    if(playMusic) {  // 如果設(shè)置背景音樂打開，則開啟服務(wù)，播放音樂 
      Intent intent_service = new Intent(GameActivity.this, MusicService.class); 
      startService(intent_service); 
    } 
    SnakeView.mMoveDelay=saved.getInt("nandu",500);   // 獲取當(dāng)前設(shè)置的代表游戲難度的變量，在難度設(shè)置界面保存，在這里讀取 
 
    // 判斷是否有保存數(shù)據(jù)，如果數(shù)據(jù)為空就準(zhǔn)備重新開始游戲 
    if (savedInstanceState == null) { 
      mSnakeView.setMode(SnakeView.READY); 
    } else { 
      // 暫停后的恢復(fù) 
      Bundle map = savedInstanceState.getBundle(ICICLE_KEY); 
      if (map != null) { 
        mSnakeView.restoreState(map); 
      } else { 
        mSnakeView.setMode(SnakeView.PAUSE); 
      } 
    } 
    mDown.setOnClickListener(this); 
    mUp.setOnClickListener(this); 
    mRight.setOnClickListener(this); 
    mLeft.setOnClickListener(this); 
    change_start.setOnClickListener(this); 
    change_stop.setOnClickListener(this); 
    change_quit.setOnClickListener(this); 
  } 
  @Override 
  public void onDestroy(){ 
    super.onDestroy(); 
    saved = PreferenceManager.getDefaultSharedPreferences(this); 
    boolean playMusic = saved.getBoolean("ifon" ,true); 
    if(playMusic) { 
      Intent intent_service = new Intent(GameActivity.this, MusicService.class); 
      stopService(intent_service); 
    } 
 
  } 
  // 給開始，暫停，退出，上下左右按鈕設(shè)置監(jiān)聽。根據(jù)當(dāng)前的狀態(tài)來決定界面的更新操作 
  public void onClick(View v) { 
    switch (v.getId()) { 
      case R.id.game_start: 
         // 重新開始游戲，這里延時(shí)變量必須初始化，不然每次游戲重新開始之后，蛇的運(yùn)動(dòng)速度不會(huì)初始化 
        if ( mSnakeView.mMode == SnakeView.READY || mSnakeView.mMode == SnakeView.LOSE) { 
          SnakeView.mMoveDelay=saved.getInt("nandu",500); 
          mSnakeView.initNewGame(); 
          mSnakeView.setMode(SnakeView.RUNNING); 
          mSnakeView.update(); 
        } 
        // 暫停后開始游戲，繼續(xù)暫停前的界面 
        if ( mSnakeView.mMode == SnakeView.PAUSE) { 
          mSnakeView.setMode(SnakeView.RUNNING); 
          mSnakeView.update(); 
        } 
        break; 
      case R.id.game_stop:  // 暫停 
        if(mSnakeView.mMode == SnakeView.RUNNING) { 
          mSnakeView.setMode(SnakeView.PAUSE); 
        } 
        break; 
      case R.id.game_quit:  // 退出，返回菜單界面 
        mSnakeView.setMode(SnakeView.QUIT); 
        finish(); 
        break; 
      // 使界面上的方向按鈕起作用 
      case R.id.left: 
        if (SnakeView.mDirection != RIGHT) { 
          SnakeView.mNextDirection = LEFT; 
        } 
        break; 
      case R.id.right: 
        if (SnakeView.mDirection != LEFT) { 
          SnakeView.mNextDirection = RIGHT; 
        } 
        break; 
      case R.id.up: 
        if (SnakeView.mDirection != DOWN) { 
          SnakeView.mNextDirection = UP; 
        } 
        break; 
      case R.id.down: 
        if (SnakeView.mDirection != UP) { 
          SnakeView.mNextDirection = DOWN; 
        } 
        break; 
      default: 
        break; 
    } 
  } 
 
  @Override 
  protected void onPause() { 
    super.onPause(); 
    mSnakeView.setMode(SnakeView.PAUSE); 
  } 
 
  @Override 
  public void onSaveInstanceState(Bundle outState) { 
    //保存游戲狀態(tài) 
    outState.putBundle(ICICLE_KEY, mSnakeView.saveState()); 
  } 
}