安卓11修改power按键功能

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 shortcut
        cancelPendingAccessibilityShortcutAction();
        result &= ~ACTION_PASS_TO_USER;
        isWakeKey = false; // wake-up will be handled separately
        if (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 {
        @Override
        public 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;