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关于android4.0.4中彩蛋的兑现

发布时间： 2012-11-23 00:03:43 作者： rapoo

关于android4.0.4中彩蛋的实现

情况：

在android4.0.4的系统设置-关于手机-Android版本，连续快速点击几下，就会出现一个机器人，长按住机器人不放，机器人会一直变大，然后出现一堆机器从屏幕上飞过

关于android4.0.4中彩蛋的兑现关于android4.0.4中彩蛋的兑现关于android4.0.4中彩蛋的兑现

觉得有点意思，于是想看看是怎么实现的，电脑上有android4.0的代码。

系统设置-关于手机的代码：

packages/apps/Settings/src/com/android/settings/DeviceInfoSettings.java

其中，点击选项的处理如下：

long[] mHits = new long[3];

  1. @Override
  2. public boolean onPreferenceTreeClick(PreferenceScreen preferenceScreen, Preference preference) {
  3. if (preference.getKey().equals(KEY_FIRMWARE_VERSION)) {
  4. System.arraycopy(mHits, 1, mHits, 0, mHits.length-1);
  5. mHits[mHits.length-1] = SystemClock.uptimeMillis();
  6. if (mHits[0] >= (SystemClock.uptimeMillis()-500)) {
  7. Intent intent = new Intent(Intent.ACTION_MAIN);
  8. intent.setClassName("android",
  9. com.android.internal.app.PlatLogoActivity.class.getName());
  10. try {
  11. startActivity(intent);
  12. } catch (Exception e) {
  13. Log.e(LOG_TAG, "Unable to start activity " + intent.toString());
  14. }
  15. }
  16. }
  17. return super.onPreferenceTreeClick(preferenceScreen, preference);
  18. }
这里可以看到对固件版本选项有特殊处理：

if (preference.getKey().equals(KEY_FIRMWARE_VERSION)) {

//如果点击的是固件版本，则记录下最近三次点击的时间；

//如果三次点击的总时间少于500ms，则启动com.android.internal.app.PlatLogoActivity

}


再看PlatLogoActivity的实现：

  1. public class PlatLogoActivity extends Activity {
  2. Toast mToast;
  3. ImageView mContent;
  4. Vibrator mZzz = new Vibrator();
  5. int mCount;
  6. final Handler mHandler = new Handler();
  8. Runnable mSuperLongPress = new Runnable() {
  9. public void run() {
  10. mCount++;
  11. mZzz.vibrate(50 * mCount);
  12. final float scale = 1f + 0.25f * mCount * mCount;
  13. mContent.setScaleX(scale);
  14. mContent.setScaleY(scale);
  16. if (mCount <= 3) {
  17. mHandler.postDelayed(mSuperLongPress, ViewConfiguration.getLongPressTimeout());
  18. } else {
  19. try {
  20. startActivity(new Intent(Intent.ACTION_MAIN)
  21. .setFlags(Intent.FLAG_ACTIVITY_NEW_TASK
  22. | Intent.FLAG_ACTIVITY_CLEAR_TASK
  23. | Intent.FLAG_ACTIVITY_EXCLUDE_FROM_RECENTS)
  24. .setClassName("com.android.systemui","com.android.systemui.Nyandroid"));
  25. } catch (ActivityNotFoundException ex) {
  26. android.util.Log.e("PlatLogoActivity", "Couldn't find platlogo screensaver.");
  27. }
  28. finish();
  29. }
  30. }
  31. };
  33. @Override
  34. protected void onCreate(Bundle savedInstanceState) {
  35. super.onCreate(savedInstanceState);
  37. mToast = Toast.makeText(this, "Android 4.0: Ice Cream Sandwich", Toast.LENGTH_SHORT);
  39. mContent = new ImageView(this);
  40. mContent.setImageResource(com.android.internal.R.drawable.platlogo);
  41. mContent.setScaleType(ImageView.ScaleType.CENTER_INSIDE);
  43. mContent.setOnTouchListener(new View.OnTouchListener() {
  44. @Override
  45. public boolean onTouch(View v, MotionEvent event) {
  46. final int action = event.getAction();
  47. if (action == MotionEvent.ACTION_DOWN) {
  48. mContent.setPressed(true);
  49. mHandler.removeCallbacks(mSuperLongPress);
  50. mCount = 0;
  51. mHandler.postDelayed(mSuperLongPress, 2*ViewConfiguration.getLongPressTimeout());
  52. } else if (action == MotionEvent.ACTION_UP) {
  53. if (mContent.isPressed()) {
  54. mContent.setPressed(false);
  55. mHandler.removeCallbacks(mSuperLongPress);
  56. mToast.show();
  57. }
  58. }
  59. return true;
  60. }
  61. });
  63. setContentView(mContent);
  64. }
  65. }
这里对图片的触摸事件进行了处理，

mHandler.postDelayed(mSuperLongPress, 2*ViewConfiguration.getLongPressTimeout());

在图片按下开始，2倍长按超时时间后，执行mSuperLongPress，而在mSuperLongPress中会设置图片缩放比例，逐渐放大。图片连续放大超过三次后，启动com.android.systemui.Nyandroid，显示一堆机器人。


frameworks/base/packages/SystemUI/src/com/android/systemui/Nyandroid.java

  1. public class Nyandroid extends Activity {
  2. final static boolean DEBUG = false;
  4. public static class Board extends FrameLayout
  5. {
  6. public static final boolean FIXED_STARS = true;
  7. public static final int NUM_CATS = 20;
  9. static Random sRNG = new Random();
  11. static float lerp(float a, float b, float f) {
  12. return (b-a)*f + a;
  13. }
  15. static float randfrange(float a, float b) {
  16. return lerp(a, b, sRNG.nextFloat());
  17. }
  19. static int randsign() {
  20. return sRNG.nextBoolean() ? 1 : -1;
  21. }
  23. static <E> E pick(E[] array) {
  24. if (array.length == 0) return null;
  25. return array[sRNG.nextInt(array.length)];
  26. }
  28. public class FlyingCat extends ImageView {
  29. public static final float VMAX = 1000.0f;
  30. public static final float VMIN = 100.0f;
  32. public float v, vr;
  34. public float dist;
  35. public float z;
  37. public ComponentName component;
  39. public FlyingCat(Context context, AttributeSet as) {
  40. super(context, as);
  41. setImageResource(R.drawable.nyandroid_anim); // @@@
  43. if (DEBUG) setBackgroundColor(0x80FF0000);
  44. }
  46. public String toString() {
  47. return String.format("<cat (%.1f, %.1f) (%d x %d)>",
  48. getX(), getY(), getWidth(), getHeight());
  49. }
  51. public void reset() {
  52. final float scale = lerp(0.1f,2f,z);
  53. setScaleX(scale); setScaleY(scale);
  55. setX(-scale*getWidth()+1);
  56. setY(randfrange(0, Board.this.getHeight()-scale*getHeight()));
  57. v = lerp(VMIN, VMAX, z);
  59. dist = 0;
  61. // android.util.Log.d("Nyandroid", "reset cat: " + this);
  62. }
  64. public void update(float dt) {
  65. dist += v * dt;
  66. setX(getX() + v * dt);
  67. }
  68. }
  70. TimeAnimator mAnim;
  72. public Board(Context context, AttributeSet as) {
  73. super(context, as);
  75. setLayerType(View.LAYER_TYPE_HARDWARE, null);
  76. setSystemUiVisibility(View.SYSTEM_UI_FLAG_LOW_PROFILE | View.SYSTEM_UI_FLAG_HIDE_NAVIGATION);
  77. setBackgroundColor(0xFF003366);
  78. }
  80. private void reset() {
  81. // android.util.Log.d("Nyandroid", "board reset");
  82. removeAllViews();
  84. final ViewGroup.LayoutParams wrap = new ViewGroup.LayoutParams(
  85. ViewGroup.LayoutParams.WRAP_CONTENT,
  86. ViewGroup.LayoutParams.WRAP_CONTENT);
  88. if (FIXED_STARS) {
  89. for(int i=0; i<20; i++) {
  90. ImageView fixedStar = new ImageView(getContext(), null);
  91. if (DEBUG) fixedStar.setBackgroundColor(0x8000FF80);
  92. fixedStar.setImageResource(R.drawable.star_anim); // @@@
  93. addView(fixedStar, wrap);
  94. final float scale = randfrange(0.1f, 1f);
  95. fixedStar.setScaleX(scale); fixedStar.setScaleY(scale);
  96. fixedStar.setX(randfrange(0, getWidth()));
  97. fixedStar.setY(randfrange(0, getHeight()));
  98. final AnimationDrawable anim = (AnimationDrawable) fixedStar.getDrawable();
  99. postDelayed(new Runnable() {
  100. public void run() {
  101. anim.start();
  102. }}, (int) randfrange(0, 1000));
  103. }
  104. }
  106. for(int i=0; i<NUM_CATS; i++) {
  107. FlyingCat nv = new FlyingCat(getContext(), null);
  108. addView(nv, wrap);
  109. nv.z = ((float)i/NUM_CATS);
  110. nv.z *= nv.z;
  111. nv.reset();
  112. nv.setX(randfrange(0,Board.this.getWidth()));
  113. final AnimationDrawable anim = (AnimationDrawable) nv.getDrawable();
  114. postDelayed(new Runnable() {
  115. public void run() {
  116. anim.start();
  117. }}, (int) randfrange(0, 1000));
  118. }
  120. if (mAnim != null) {
  121. mAnim.cancel();
  122. }
  123. mAnim = new TimeAnimator();
  124. mAnim.setTimeListener(new TimeAnimator.TimeListener() {
  125. public void onTimeUpdate(TimeAnimator animation, long totalTime, long deltaTime) {
  126. // setRotation(totalTime * 0.01f); // not as cool as you would think
  127. // android.util.Log.d("Nyandroid", "t=" + totalTime);
  129. for (int i=0; i<getChildCount(); i++) {
  130. View v = getChildAt(i);
  131. if (!(v instanceof FlyingCat)) continue;
  132. FlyingCat nv = (FlyingCat) v;
  133. nv.update(deltaTime / 1000f);
  134. final float catWidth = nv.getWidth() * nv.getScaleX();
  135. final float catHeight = nv.getHeight() * nv.getScaleY();
  136. if ( nv.getX() + catWidth < -2
  137. || nv.getX() > getWidth() + 2
  138. || nv.getY() + catHeight < -2
  139. || nv.getY() > getHeight() + 2)
  140. {
  141. nv.reset();
  142. }
  143. }
  144. }
  145. });
  146. }
  148. @Override
  149. protected void onSizeChanged (int w, int h, int oldw, int oldh) {
  150. super.onSizeChanged(w,h,oldw,oldh);
  151. // android.util.Log.d("Nyandroid", "resized: " + w + "x" + h);
  152. post(new Runnable() { public void run() {
  153. reset();
  154. mAnim.start();
  155. } });
  156. }
  159. @Override
  160. protected void onDetachedFromWindow() {
  161. super.onDetachedFromWindow();
  162. mAnim.cancel();
  163. }
  165. @Override
  166. public boolean isOpaque() {
  167. return true;
  168. }
  169. }
  171. private Board mBoard;
  173. @Override
  174. public void onStart() {
  175. super.onStart();
  177. getWindow().addFlags(
  178. WindowManager.LayoutParams.FLAG_ALLOW_LOCK_WHILE_SCREEN_ON
  179. | WindowManager.LayoutParams.FLAG_SHOW_WHEN_LOCKED
  180. );
  181. }
  183. @Override
  184. public void onResume() {
  185. super.onResume();
  186. mBoard = new Board(this, null);
  187. setContentView(mBoard);
  189. mBoard.setOnSystemUiVisibilityChangeListener(new View.OnSystemUiVisibilityChangeListener() {
  190. @Override
  191. public void onSystemUiVisibilityChange(int vis) {
  192. if (0 == (vis & View.SYSTEM_UI_FLAG_HIDE_NAVIGATION)) {
  193. Nyandroid.this.finish();
  194. }
  195. }
  196. });
  197. }
  199. @Override
  200. public void onUserInteraction() {
  201. // android.util.Log.d("Nyandroid", "finishing on user interaction");
  202. finish();
  203. }
  204. }
这里面FlyingCat继承了ImageView，每次产生一个FlyingCat，生成的图片大小都是随机的。

Board继承了FrameLayout，所有的星星和机器人图片都添加到Board中。

Board使用TimeAnimator定时刷新每个机器人图片的位置，实现了移动。

星星和机器本身的变化是同过boolean postDelayed(Runnable r, long delayMillis)实现自身形状变化的。

  1. postDelayed(new Runnable() {
  2. public void run() {
  3. anim.start();
  4. }}, (int) randfrange(0, 1000));

2楼BangBangZuo4天前 13:44
哈哈，挺有意思的
1楼jindows4天前 11:49
可惜版本不是，才4.0.3 。

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