客戶需要把power鍵的短按休眠功能去除，并且把長按功能改成直接關機，我們先分析系統framework層處理按鍵的代碼：
interceptKeyBeforeQueueing
power按鍵上來都會直接走這里，我們找到power按鍵處理的地方如下：

    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;}看到這里就明白了，所以短按必定是在interceptPowerKeyUp里處理完成的，因為長按是在按住不放的情況下出來的，所以長按必定是在interceptPowerKeyDown這里處理的。我們先把短按屏蔽掉：

            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);這句去掉就沒有短按了}// Done.  Reset our state.finishPowerKeyPress();
}

下面就改長按的功能，找到
private void interceptPowerKeyDown(KeyEvent event, boolean interactive)
看到這個方法里有如下內容：

                 // 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);//長按默認走這里，通過發送MSG_POWER_LONG_PRESS消息到handler處理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);}}}這里接收長按消息處理         private class PolicyHandler extends Handler {@Overridepublic void handleMessage(Message msg) {switch (msg.what) {case MSG_POWER_LONG_PRESS:powerLongPress();break;最終長按都會到這里處理powerLongPress()直接這樣改就能實現把顯示關機重啟對話框改為直接關機功能@@ -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次進入camera，還是在這里修改 private void

interceptPowerKeyDown(KeyEvent event, boolean interactive) {找到如下代碼屏蔽即可：/*這里屏蔽短按打開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*/ //這里屏蔽|| handledByPowerManager;