Android SurfaceView游戏开发示范

Android SurfaceView游戏开发示例

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当我们需要开发一个复杂游戏的时候，而且对程序的执行效率要求很高时，View类就不能满足需求了，这时必须用SurfaceView类进行开发。

例如，对速度要求很高的游戏时，View类就不能满足需求了，这时必须使用SurfaceView类进行开发。例如，对速度要求很高的游戏，可以使用双缓冲来显示。游戏中的背景、人物、动画等都需要绘制在一个画布(Canvas)上，而SurfaceView可以直接访问一个画布，SurfaceView 是提供给需要直接画像素而不是使用窗体部件的应用使用的。 每个Surface创建一个Canvas对象(但属性时常改变),用来管理View和Surface上的绘图操作。?

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具体示例：

Activity

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1. public?class?Activity01?extends?Activity?{??
2. ??????
3. ????GameSurfaceView?gameView?=?null;??
4. ??????
5. ????@Override??
6. ????public?void?onCreate(Bundle?savedInstanceState)?{??
7. ????????super.onCreate(savedInstanceState);??
8. ?????????
9. ????????gameView?=?new?GameSurfaceView(this);??
10. ????????setContentView(gameView);??
11. ????}??
12. }??

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GameSurfaceView

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1. public?class?GameSurfaceView?extends?SurfaceView?implements?SurfaceHolder.Callback,?Runnable{??
2. ??
3. ????private?Activity01?mActivity?=?null;??
4. ??????
5. ????private?SurfaceHolder?mHolder?=?null;??
6. ????private?Thread?mThread?=?null;;??
7. ????private?boolean?mLoop?=?false;??
8. ??????
9. ????private?Canvas?mCanvas?=?null;??
10. ????private?Paint?mPaint?=?null;??
11. ????private?long?drawStartTime?=?0,?drawCostTime?=?0,?drawTotalTime?=?30;??
12. ??????
13. ????private?float?x,?y;??
14. ????private?int?screenWidth?=?480,?screenHeight?=?800;??
15. ??????
16. ????public?GameSurfaceView(Context?context)?{??
17. ????????super(context);??
18. ??
19. ????????mActivity?=?(Activity01)context;??
20. ??????????
21. ????????mHolder?=?this.getHolder();??
22. ????????mHolder.addCallback(this);??
23. ????????setFocusable(true);??
24. ????}??
25. ??
26. ????@Override??
27. ????public?void?surfaceCreated(SurfaceHolder?holder)?{??
28. ????????mPaint?=?new?Paint();??
29. ????????mPaint.setColor(Color.CYAN);??
30. ????????mLoop?=?true;??
31. ??????????
32. ????????new?Thread(this).start();??
33. ????}??
34. ??
35. ????@Override??
36. ????public?void?surfaceChanged(SurfaceHolder?holder,?int?format,?int?width,?int?height)?{??
37. ????????screenWidth?=?width;??
38. ????????screenHeight?=?height;??
39. ??????????
40. ????????x?=?screenWidth?/?2;??
41. ????????y?=?screenHeight?/?2;??
42. ????}??
43. ??
44. ????@Override??
45. ????public?void?surfaceDestroyed(SurfaceHolder?holder)?{??
46. ????????mLoop?=?false;??
47. ????}??
48. ??
49. ????@Override??
50. ????public?void?run()?{??
51. ????????while(mLoop){??
52. ????????????drawStartTime?=?SystemClock.uptimeMillis();??
53. ??????????????
54. ????????????synchronized?(mHolder)?{??
55. ????????????????try?{??
56. ????????????????????mCanvas?=?mHolder.lockCanvas();??
57. ????????????????????onDraw();???????//?repaint??
58. ????????????????}?catch?(Exception?e)?{??
59. ????????????????????e.printStackTrace();??
60. ????????????????}?finally?{??
61. ????????????????????if(mCanvas?!=?null){??
62. ????????????????????????mHolder.unlockCanvasAndPost(mCanvas);??
63. ????????????????????}??
64. ????????????????}??
65. ????????????}??
66. ??????????????
67. ????????????drawCostTime?=?SystemClock.uptimeMillis()?-?drawStartTime;??
68. ????????????Log.i("drawCostTime",?"drawCostTime?=?"?+?drawCostTime);??
69. ????????????try?{??
70. ????????????????if(drawCostTime?<?drawTotalTime){??
71. ????????????????????Thread.sleep(drawTotalTime?-?drawCostTime);?????//?sleep?elapse?time??
72. ????????????????}??
73. ????????????}?catch?(Exception?e)?{??
74. ????????????????e.printStackTrace();??
75. ????????????}??
76. ????????}??
77. ????}??
78. ??????
79. ????private?void?onDraw(){??
80. ????????if(mHolder?==?null?&&?mPaint?==?null){??
81. ????????????return;??
82. ????????}??
83. ??????????
84. ????????mPaint.setAntiAlias(true);??
85. ????????mPaint.setAlpha(100);??
86. ??????????
87. ????????mPaint.setColor(Color.CYAN);????//?paint?background?color??
88. ????????mCanvas.drawRect(0,?0,?screenWidth,?screenHeight,?mPaint);??
89. ??????????
90. ????????mPaint.setColor(Color.BLUE);????//?paint?foreground?color??
91. ????????mCanvas.drawCircle(x,?y,?50,?mPaint);??
92. ????}??
93. ??????
94. ????@Override??
95. ????public?boolean?onTouchEvent(MotionEvent?event)?{??
96. ????????super.onTouchEvent(event);??
97. ??
98. ????????switch?(event.getAction())?{??
99. ????????case?MotionEvent.ACTION_DOWN:??
100. ????????????this.x?=?event.getX();??
101. ????????????this.y?=?event.getY();??
102. ????????????break;??
103. ??
104. ????????case?MotionEvent.ACTION_MOVE:??
105. ????????????this.x?=?event.getX();??
106. ????????????this.y?=?event.getY();??
107. ????????????break;??
108. ??
109. ????????case?MotionEvent.ACTION_UP:??
110. ????????????this.x?=?event.getX();??
111. ????????????this.y?=?event.getY();??
112. ????????????break;??
113. ??
114. ????????default:??
115. ????????????this.x?=?event.getX();??
116. ????????????this.y?=?event.getY();??
117. ????????????break;??
118. ????????}??
119. ??
120. ????????return?true;????//?true?then?event?can?be?implemented?again??
121. ????}??
122. ??
123. ????@Override??
124. ????public?boolean?onKeyDown(int?keyCode,?KeyEvent?event){??
125. ????????super.onKeyDown(keyCode,?event);??
126. ??????????
127. ????????if(keyCode?==?KeyEvent.ACTION_DOWN){??
128. ????????????this.mActivity.finish();??
129. ????????}??
130. ??????????
131. ????????return?true;??
132. ????}??
133. }??

运行效果：

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