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系统在frameworks/base/services/core/java/com/android/server/policy/PhoneWindowManager.java处理按键事件,不管是物理按键还是
SystemUI的nav_bar上的虚拟按键(使用了KeyEvent类中的,比如:KeyEvent.KEYCODE_VOLUME_UP).

主要注意的有两个函数：
interceptKeyBeforeDispatching 分发之前拦截事件

interceptKeyBeforeQueueing 加入队列之前拦截事件

长按物理音量上键弹出重启Dialog,去除Dialog界面部分选项

    @Overridepublic long interceptKeyBeforeDispatching(IBinder focusedToken, KeyEvent event,int policyFlags) {final boolean keyguardOn = keyguardOn();final int keyCode = event.getKeyCode();final int repeatCount = event.getRepeatCount();final int metaState = event.getMetaState();final int flags = event.getFlags();final boolean down = event.getAction() == KeyEvent.ACTION_DOWN;final boolean canceled = event.isCanceled();final int displayId = event.getDisplayId();if (true) {Log.d("tag", "interceptKeyTi keyCode=" + keyCode + " down=" + down + " repeatCount="+ repeatCount + " keyguardOn=" + keyguardOn + " canceled=" + canceled);}//add textLog.d("tag", "policyFlags:" + policyFlags);//长按和短按会产生不同的policyFlags//短按流程 按下 down=true repeatCount=0 2次  抬起 down=false repeatCount=0//长按流程 按下 down=true repeatCount++ 不断自增  抬起 down=false repeatCount=0if (keyCode == KeyEvent.KEYCODE_VOLUME_UP) {//1107296256  long  //1644167168 shortif (policyFlags == 1107296256 || policyFlags == 1644167168) {if (repeatCount == 20) {mHandler.removeMessages(MSG_DISPATCH_SHOW_GLOBAL_ACTIONS);mHandler.sendEmptyMessageDelayed(MSG_DISPATCH_SHOW_GLOBAL_ACTIONS, 2000 * 1);}return -1;}}//add text//infrare simulate mouseboolean isBox = "box".equals(SystemProperties.get("ro.target.product"));if(isBox){...}//
Message msg = mHandler.obtainMessage(MSG_POWER_LONG_PRESS);
msg.setAsynchronous(true);
mHandler.sendMessageDelayed(msg,ViewConfiguration.get(mContext).getDeviceGlobalActionKeyTimeout());
->
powerLongPress();                          
||
showGlobalActions();frameworks/base/packages/SystemUI/src/com/android/systemui/globalactions/GlobalActionsDialog.java
//dialog所有菜单选项<string-array translatable="false" name="config_globalActionsList"><item>emergency</item><item>lockdown</item><item>power</item><item>restart</item><item>logout</item><item>screenshot</item><item>bugreport</item></string-array>@VisibleForTestingprotected void createActionItems() {// Simple toggle style if there's no vibrator, otherwise use a tri-stateif (!mHasVibrator) {mSilentModeAction = new SilentModeToggleAction();} else {mSilentModeAction = new SilentModeTriStateAction(mAudioManager, mHandler);}mAirplaneModeOn = new AirplaneModeAction();onAirplaneModeChanged();mItems.clear();mOverflowItems.clear();mPowerItems.clear();String[] defaultActions = {"restart"};//getDefaultActions();//add textShutDownAction shutdownAction = new ShutDownAction();RestartAction restartAction = new RestartAction();ArraySet<String> addedKeys = new ArraySet<String>();List<Action> tempActions = new ArrayList<>();CurrentUserProvider currentUser = new CurrentUserProvider();//add text// make sure emergency affordance action is first, if needed/*if (mEmergencyAffordanceManager.needsEmergencyAffordance()) {addIfShouldShowAction(tempActions, new EmergencyAffordanceAction());addedKeys.add(GLOBAL_ACTION_KEY_EMERGENCY);}*///add textfor (int i = 0; i < defaultActions.length; i++) {String actionKey = defaultActions[i];if (addedKeys.contains(actionKey)) {// If we already have added this, don't add it again.continue;}...
}//点击dialog外,让它消失protected static ActionsDialog mDialog;//add static private void initializeLayout() {setContentView(com.android.systemui.R.layout.global_actions_grid_v2);fixNavBarClipping();mControlsView = findViewById(com.android.systemui.R.id.global_actions_controls);mGlobalActionsLayout = findViewById(com.android.systemui.R.id.global_actions_view);mGlobalActionsLayout.setListViewAccessibilityDelegate(new View.AccessibilityDelegate() {@Overridepublic boolean dispatchPopulateAccessibilityEvent(View host, AccessibilityEvent event) {// Populate the title here, just as Activity doesevent.getText().add(mContext.getString(R.string.global_actions));return true;}});//add textViewGroup black_view = findViewById(com.android.systemui.R.id.global_actions_grid_root);black_view.setClickable(true);black_view.setOnClickListener(v -> {if (mDialog != null) mDialog.dismiss();//dismissDialog();});//add textmGlobalActionsLayout.setRotationListener(this::onRotate);mGlobalActionsLayout.setAdapter(mAdapter);//衍生案例1: 长按电源键直接关机不弹出dialogvoid showGlobalActionsInternal() {//add text/*if (mGlobalActions == null) {mGlobalActions = new GlobalActions(mContext, mWindowManagerFuncs);}final boolean keyguardShowing = isKeyguardShowingAndNotOccluded();mGlobalActions.showDialog(keyguardShowing, isDeviceProvisioned());// since it took two seconds of long press to bring this up,// poke the wake lock so they have some time to see the dialog.mPowerManager.userActivity(SystemClock.uptimeMillis(), false);*/mPowerManager.shutdown(false,null,false);//add text//add text}
//也可以修改属性实现
./frameworks/base/core/res/res/values/config.xml<!-- Control the behavior when the user long presses the power button.0 - Nothing1 - Global actions menu - 长按电源按钮将显示一个包含各种全局操作选项的菜单2 - Power off (with confirmation) 长按电源按钮将触发设备的关机动作,弹出需要用户确认的dialog3 - Power off (without confirmation) 长按电源按钮将触发设备的关机动作,不需要用户确认4 - Go to voice assist 长按电源按钮将启动语音助手5 - Go to assistant (Settings.Secure.ASSISTANT) 长按电源按钮将启动设备的默认助手应用程序--><integer name="config_longPressOnPowerBehavior">1</integer>    //衍生案例2: 长按power键按住三秒即可自动关机<integer name="config_longPressOnPowerBehavior">3</integer>   //先去掉dialog @Overridepublic int interceptKeyBeforeQueueing(KeyEvent event, int policyFlags) {...case KeyEvent.KEYCODE_POWER: {//add text 长按3s关机,达不到3s取消if (down) {Message msg = mHandler.obtainMessage(MSG_POWER_LONG_PRESS);msg.setAsynchronous(true);mHandler.sendMessageDelayed(msg,3000);} else {mHandler.removeMessages(MSG_POWER_LONG_PRESS);}//add textbreak;}//注释掉原来的逻辑/*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;}*/
}

Adroid11.0长按power键关机流程分析
Android 设备按键处理

一些按键模拟案例

    @Overridepublic long interceptKeyBeforeDispatching(IBinder focusedToken, KeyEvent event,int policyFlags) {...} else if (keyCode == KeyEvent.KEYCODE_MENU) {// Hijack modified menu keys for debugging featuresfinal int chordBug = KeyEvent.META_SHIFT_ON;//add text 模拟长按if (event.getAction() == KeyEvent.ACTION_UP && (event.getEventTime() - event.getDownTime() > 800)) {Log.d(TAG,"this is a KEYCODE_MENU's long press");//to doreturn -1;}//add text...}