1 /* 2 * Copyright (C) 2007 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package com.example.android.snake; 18 19 import android.app.Activity; 20 import android.os.Bundle; 21 import android.view.KeyEvent; 22 import android.view.MotionEvent; 23 import android.view.View; 24 import android.view.View.OnTouchListener; 25 import android.widget.TextView; 26 27 /** 28 * Snake: a simple game that everyone can enjoy. 29 * 30 * This is an implementation of the classic Game "Snake", in which you control a serpent roaming 31 * around the garden looking for apples. Be careful, though, because when you catch one, not only 32 * will you become longer, but you'll move faster. Running into yourself or the walls will end the 33 * game. 34 * 35 */ 36 public class Snake extends Activity { 37 38 /** 39 * Constants for desired direction of moving the snake 40 */ 41 public static int MOVE_LEFT = 0; 42 public static int MOVE_UP = 1; 43 public static int MOVE_DOWN = 2; 44 public static int MOVE_RIGHT = 3; 45 46 private static String ICICLE_KEY = "snake-view"; 47 48 private SnakeView mSnakeView; 49 50 /** 51 * Called when Activity is first created. Turns off the title bar, sets up the content views, 52 * and fires up the SnakeView. 53 * 54 */ 55 @Override onCreate(Bundle savedInstanceState)56 public void onCreate(Bundle savedInstanceState) { 57 super.onCreate(savedInstanceState); 58 59 setContentView(R.layout.snake_layout); 60 61 mSnakeView = (SnakeView) findViewById(R.id.snake); 62 mSnakeView.setDependentViews((TextView) findViewById(R.id.text), 63 findViewById(R.id.arrowContainer), findViewById(R.id.background)); 64 65 if (savedInstanceState == null) { 66 // We were just launched -- set up a new game 67 mSnakeView.setMode(SnakeView.READY); 68 } else { 69 // We are being restored 70 Bundle map = savedInstanceState.getBundle(ICICLE_KEY); 71 if (map != null) { 72 mSnakeView.restoreState(map); 73 } else { 74 mSnakeView.setMode(SnakeView.PAUSE); 75 } 76 } 77 mSnakeView.setOnTouchListener(new OnTouchListener() { 78 79 @Override 80 public boolean onTouch(View v, MotionEvent event) { 81 if (mSnakeView.getGameState() == SnakeView.RUNNING) { 82 // Normalize x,y between 0 and 1 83 float x = event.getX() / v.getWidth(); 84 float y = event.getY() / v.getHeight(); 85 86 // Direction will be [0,1,2,3] depending on quadrant 87 int direction = 0; 88 direction = (x > y) ? 1 : 0; 89 direction |= (x > 1 - y) ? 2 : 0; 90 91 // Direction is same as the quadrant which was clicked 92 mSnakeView.moveSnake(direction); 93 94 } else { 95 // If the game is not running then on touching any part of the screen 96 // we start the game by sending MOVE_UP signal to SnakeView 97 mSnakeView.moveSnake(MOVE_UP); 98 } 99 return false; 100 } 101 }); 102 } 103 104 @Override onPause()105 protected void onPause() { 106 super.onPause(); 107 // Pause the game along with the activity 108 mSnakeView.setMode(SnakeView.PAUSE); 109 } 110 111 @Override onSaveInstanceState(Bundle outState)112 public void onSaveInstanceState(Bundle outState) { 113 // Store the game state 114 outState.putBundle(ICICLE_KEY, mSnakeView.saveState()); 115 } 116 117 /** 118 * Handles key events in the game. Update the direction our snake is traveling based on the 119 * DPAD. 120 * 121 */ 122 @Override onKeyDown(int keyCode, KeyEvent msg)123 public boolean onKeyDown(int keyCode, KeyEvent msg) { 124 125 switch (keyCode) { 126 case KeyEvent.KEYCODE_DPAD_UP: 127 mSnakeView.moveSnake(MOVE_UP); 128 break; 129 case KeyEvent.KEYCODE_DPAD_RIGHT: 130 mSnakeView.moveSnake(MOVE_RIGHT); 131 break; 132 case KeyEvent.KEYCODE_DPAD_DOWN: 133 mSnakeView.moveSnake(MOVE_DOWN); 134 break; 135 case KeyEvent.KEYCODE_DPAD_LEFT: 136 mSnakeView.moveSnake(MOVE_LEFT); 137 break; 138 } 139 140 return super.onKeyDown(keyCode, msg); 141 } 142 143 } 144