[Android]长按电源键(Power Key)的处理

Android4.2代码位置：
\frameworks\base\policy\src\com\android\internal\policy\impl\PhoneWindowManager.java

关键方法：
PhoneWindowManager.java
-->interceptKeyBeforeQueueing()

case KeyEvent.KEYCODE_POWER: //26

-->interceptPowerKeyDown()

-->private final Runnable mPowerLongPress = new Runnable() {

case LONG_PRESS_POWER_GLOBAL_ACTIONS:
mPowerKeyHandled = true;
if (!performHapticFeedbackLw(null, HapticFeedbackConstants.LONG_PRESS, false)) {
performAuditoryFeedbackForAccessibilityIfNeed();
}
sendCloseSystemWindows(SYSTEM_DIALOG_REASON_GLOBAL_ACTIONS);
showGlobalActionsDialog();
break;