经典贪吃蛇游戏源码解析

package com.example.Android.snake;

import Android.app.Activity;
import Android.os.Bundle;
import Android.util.Log;
import Android.view.Window;
import Android.widget.TextView;

 

/**
 * 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.
 * 
 */
public class Snake extends Activity {
    private final static String TAG = "****   ***Snake*****  *****";

    private SnakeView mSnakeView;
    
    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.
     * 

     */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        // No Title bar  全屏用的 需要在setContentView之前使用
        requestWindowFeature(Window.FEATURE_NO_TITLE);      设置window属性

        setContentView(R.layout.snake_layout);

        mSnakeView = (SnakeView) findViewById(R.id.snake);
        mSnakeView.setTextView((TextView) findViewById(R.id.text));    mSnakeView继承TileView继承View
        
        if (savedInstanceState == null) {        这个跟activity有关
            // We were just launched -- set up a new game
            mSnakeView.setMode(SnakeView.READY);
        } else {                                             如果存储了内容  就要读取内容在准备
            // We are being restored
            Bundle map = savedInstanceState.getBundle(ICICLE_KEY);   状态获取   这个跟游戏有关
            if (map != null) {                                                              
                mSnakeView.restoreState(map);                               恢复游戏  从map中获取数据信息   也会调用setMode(PAUSE)
            } else {
                mSnakeView.setMode(SnakeView.PAUSE);                 恢复acticity，但是游戏并没有保存数据    从暂停或者ready要run的模式改变是通过向上的按键
            }
        }
    }

    @Override
    protected void onPause() {
        super.onPause();