客户需要把power键的短按休眠功能去除，并且把长按功能改成直接关机，我们先分析系统framework层处理按键的代码：
interceptKeyBeforeQueueing
power按键上来都会直接走这里，我们找到power按键处理的地方如下：

    case KeyEvent.KEYCODE_POWER: {EventLogTags.writeInterceptPower(KeyEvent.actionToString(event.getAction()),mPowerKeyHandled ? 1 : 0, mPowerKeyPressCounter);// Any activity on the power button stops the accessibility shortcutcancelPendingAccessibilityShortcutAction();result &= ~ACTION_PASS_TO_USER;isWakeKey = false; // wake-up will be handled separatelyif (down) {interceptPowerKeyDown(event, interactive);} else {interceptPowerKeyUp(event, interactive, canceled);}break;}看到这里就明白了，所以短按必定是在interceptPowerKeyUp里处理完成的，因为长按是在按住不放的情况下出来的，所以长按必定是在interceptPowerKeyDown这里处理的。我们先把短按屏蔽掉：

            private void interceptPowerKeyUp(KeyEvent event, boolean interactive, boolean canceled) {final boolean handled = canceled || mPowerKeyHandled;mScreenshotChordPowerKeyTriggered = false;cancelPendingScreenshotChordAction();cancelPendingPowerKeyAction();if (!handled) {if ((event.getFlags() & KeyEvent.FLAG_LONG_PRESS) == 0) {// Abort possibly stuck animations only when power key up without long press case.mHandler.post(mWindowManagerFuncs::triggerAnimationFailsafe);}// Figure out how to handle the key now that it has been released.mPowerKeyPressCounter += 1;final int maxCount = getMaxMultiPressPowerCount();final long eventTime = event.getDownTime();if (mPowerKeyPressCounter < maxCount) {// This could be a multi-press.  Wait a little bit longer to confirm.// Continue holding the wake lock.Message msg = mHandler.obtainMessage(MSG_POWER_DELAYED_PRESS,interactive ? 1 : 0, mPowerKeyPressCounter, eventTime);msg.setAsynchronous(true);mHandler.sendMessageDelayed(msg, ViewConfiguration.getMultiPressTimeout());return;}// No other actions.  Handle it immediately.//    powerPress(eventTime, interactive, mPowerKeyPressCounter);这句去掉就没有短按了}// Done.  Reset our state.finishPowerKeyPress();
}

下面就改长按的功能，找到
private void interceptPowerKeyDown(KeyEvent event, boolean interactive)
看到这个方法里有如下内容：

                 // When interactive, we're already awake.// Wait for a long press or for the button to be released to decide what to do.if (hasLongPressOnPowerBehavior()) {if ((event.getFlags() & KeyEvent.FLAG_LONG_PRESS) != 0) {powerLongPress();} else {Message msg = mHandler.obtainMessage(MSG_POWER_LONG_PRESS);//长按默认走这里，通过发送MSG_POWER_LONG_PRESS消息到handler处理msg.setAsynchronous(true);mHandler.sendMessageDelayed(msg,ViewConfiguration.get(mContext).getDeviceGlobalActionKeyTimeout());if (hasVeryLongPressOnPowerBehavior()) {Message longMsg = mHandler.obtainMessage(MSG_POWER_VERY_LONG_PRESS);longMsg.setAsynchronous(true);mHandler.sendMessageDelayed(longMsg, mVeryLongPressTimeout);}}}这里接收长按消息处理         private class PolicyHandler extends Handler {@Overridepublic void handleMessage(Message msg) {switch (msg.what) {case MSG_POWER_LONG_PRESS:powerLongPress();break;最终长按都会到这里处理powerLongPress()直接这样改就能实现把显示关机重启对话框改为直接关机功能@@ -1306,14 +1307,21 @@private void powerLongPress() {final int behavior = getResolvedLongPressOnPowerBehavior();
+         Log.i("fan","behavior is"+behavior);switch (behavior) {case LONG_PRESS_POWER_NOTHING:break;case LONG_PRESS_POWER_GLOBAL_ACTIONS:mPowerKeyHandled = true;
-                performHapticFeedback(HapticFeedbackConstants.LONG_PRESS, false,
-                        "Power - Long Press - Global Actions");
-                showGlobalActionsInternal();
+             performHapticFeedback(HapticFeedbackConstants.LONG_PRESS, false,
+                        "Power - Long Press - Shut Off");
+                sendCloseSystemWindows(SYSTEM_DIALOG_REASON_GLOBAL_ACTIONS);
+                mWindowManagerFuncs.shutdown(behavior == LONG_PRESS_POWER_SHUT_OFF);
+               // performHapticFeedback(HapticFeedbackConstants.LONG_PRESS, false,
+                     //   "Power - Long Press - Global Actions");
+                //showGlobalActionsInternal();break;case LONG_PRESS_POWER_SHUT_OFF:case LONG_PRESS_POWER_SHUT_OFF_NO_CONFIRM:

如果要去除短按2次进入camera，还是在这里修改 private void

interceptPowerKeyDown(KeyEvent event, boolean interactive) {找到如下代码屏蔽即可：/*这里屏蔽短按打开camera功能 GestureLauncherService gestureService = LocalServices.getService(GestureLauncherService.class);boolean gesturedServiceIntercepted = false;if (gestureService != null) {gesturedServiceIntercepted = gestureService.interceptPowerKeyDown(event, interactive,mTmpBoolean);if (mTmpBoolean.value && mRequestedOrGoingToSleep) {mCameraGestureTriggeredDuringGoingToSleep = true;}}
*/// Inform the StatusBar; but do not allow it to consume the event.sendSystemKeyToStatusBarAsync(event.getKeyCode());schedulePossibleVeryLongPressReboot();// If the power key has still not yet been handled, then detect short// press, long press, or multi press and decide what to do.mPowerKeyHandled = hungUp || mScreenshotChordVolumeDownKeyTriggered|| mA11yShortcutChordVolumeUpKeyTriggered /*|| gesturedServiceIntercepted*/ //这里屏蔽|| handledByPowerManager;