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场景需求：

在底部导航栏添加power案件，单击息屏，长按 关机

如下实现图

借此需求，需要掌握技能：

• 底部导航栏如何实现
• 新增、修改、删除底部导航栏流程
• 对底部导航栏部分样式如何修改。 比如放不下、顺序排列、坑点如何修改等

修改-新增文件:

新增

\vendor\mediatek\proprietary\packages\apps\SystemUI\res\layout\power.xml         [新增底部导航 power 功能按键布局文件]
\vendor\mediatek\proprietary\packages\apps\SystemUI\res\drawable\ic_lock_power_off.xml  [新增power按键icon图标]

修改

\vendor\mediatek\proprietary\packages\apps\SystemUI\src\com\android\systemui\navigationbar\NavigationBarView.java
\vendor\mediatek\proprietary\packages\apps\SystemUI\src\com\android\systemui\navigationbar\NavigationBar.java
\vendor\mediatek\proprietary\packages\apps\SystemUI\src\com\android\systemui\navigationbar\NavigationBarInflaterView.java需改：新增 power 功能菜单
\vendor\mediatek\proprietary\packages\apps\SystemUI\res\values\config.xml      
\vendor\mediatek\proprietary\packages\apps\SystemUI\res\values-sw900dp\config.xml
\vendor\mediatek\proprietary\packages\apps\SystemUI\res\values-sw600dp\config.xml//按键太多，设置按键宽度，让竖屏情况下多个功能虚拟按键能够正常显示出来：我们对应的dimens 文件为values-sw600dp  故，只修改这个文件即可
/vendor/mediatek/proprietary/packages/apps/SystemUI/res/values-sw600dp/dimens.xml

具体修改点

修改点 一）
功能按键添加：power

<string name="config_navBarLayout" translatable="false">left;volume_sub,back,home,recent,wb_sunny,volume_add,power,screenshot;right</string>

修改点 二）
虚拟按键宽度和padding 重写设置：

<dimen name="navigation_key_width">90dp</dimen>

修改点 三）

NavigationBarView.java            [设置按键图标、按键放到集合中，便于封装操作]
NavigationBar.java                 [点触事件 长按、短按事件]
NavigationBarInflaterView.java   [加载布局，加载功能按键view]
见修改文件  wang 相关 add 和 end 结束位置
下文 详细说明

参考资料

Android 8.1平台SystemUI 导航栏加载流程解析：
Android 9.0 SystemUI NavigationBar
Android13 关于SystemUI更新Nav Bar add volume button && other button
Android 导航栏功能项的显示与屏蔽
Android 12 自定义底部导航栏
Android11 底部导航栏添加虚拟按钮-问题合集

实现思路和具体方案

在实现方案之前，一脸蒙蔽，那是缺乏一定的知识储备，实现后发现思路很清晰的，理解流程，一步一步实现即可。可以参考现有的实现方案，比如：home/back/recent 部分Android版本
本身就已经有的功能，照葫芦画瓢。

主要思路如下：

• 创建功能按键布局layout[对应 xml]:参考已有的功能按键
• 配置文件中，新增功能按键菜单，只有有了默认的配置才会加载上面的布局View
• NavigationBar为系统加载的组件，在组件中实现点击事件，在关联的加载布局View 类
  NavigationBarInflaterView.java 和 NavigationBarView.java 实现布局的功能按键View的添加和功能view 的获取/设置View背景等，最终实现功能按键的加载。

布局创建

比如我们的power.xml

<?xml version="1.0" encoding="utf-8"?>
<com.android.systemui.navigationbar.buttons.KeyButtonViewxmlns:android="http://schemas.android.com/apk/res/android"xmlns:systemui="http://schemas.android.com/apk/res-auto"android:id="@+id/power"android:layout_width="@dimen/navigation_key_width"android:layout_height="match_parent"android:layout_weight="0"systemui:keyCode="26"android:scaleType="center"android:contentDescription="@string/accessibility_home"android:paddingStart="@dimen/navigation_key_padding"android:paddingEnd="@dimen/navigation_key_padding"/>

那为什么这么创建？ 找一下 已有的 功能按键 比如Home 按键：

<com.android.systemui.navigationbar.buttons.KeyButtonViewxmlns:android="http://schemas.android.com/apk/res/android"xmlns:systemui="http://schemas.android.com/apk/res-auto"android:id="@+id/home"android:layout_width="@dimen/navigation_key_width"android:layout_height="match_parent"android:layout_weight="0"systemui:keyCode="3"android:scaleType="center"android:contentDescription="@string/accessibility_home"android:paddingStart="@dimen/navigation_key_padding"android:paddingEnd="@dimen/navigation_key_padding"/>

这里有三个点需要注意：

• layout_width 值的设置，底部导航栏功能按键过多，会出现不会显示全的问题，需要适配。
• keyCode，有keyCode设置，会根据KeyButtonView 监听到keyCode
  按键值，这样可以监听并执行对应逻辑。【此需求暂无用到】
• id： 这个id 在NavigationBarView，中的 mButtonDispatchers.put(R.id.power, new
  ButtonDispatcher(R.id.power)); 对应 匹配，不然找不到id。

布局加载

添加到NavigationBarInflaterView中去，NavigationBarInflaterView 见名知意。本身代码量不多的，就是一个View，加载功能按键子View

NavigationBarInflaterView extends FrameLayout ，正常的一个FragmentLayout ，如下举例几个简单方法

加载配置

 protected String getDefaultLayout() {//wangfangchen add /*final int defaultResource = QuickStepContract.isGesturalMode(mNavBarMode)? R.string.config_navBarLayoutHandle: mOverviewProxyService.shouldShowSwipeUpUI()? R.string.config_navBarLayoutQuickstep: R.string.config_navBarLayout;*/final int defaultResource =		 R.string.config_navBarLayout;Log.d(TAG,"getDefaultLayout  "+getContext().getString(defaultResource));//wangfangchen end  return getContext().getString(defaultResource);}

所以我们需要新增功能按键就需要在配置 文件中添加功能按键：power

<string name="config_navBarLayout" translatable="false">left;volume_sub,back,home,recent,wb_sunny,volume_add,power,screenshot;right</string>

加载子View

@Overrideprotected void onFinishInflate() {super.onFinishInflate();inflateChildren();clearViews();inflateLayout(getDefaultLayout());}protected void inflateLayout(String newLayout) {mCurrentLayout = newLayout;if (newLayout == null) {newLayout = getDefaultLayout();}String[] sets = newLayout.split(GRAVITY_SEPARATOR, 3);Log.d(TAG, "inflateLayout  newLayout:"+newLayout);if (sets.length != 3) {Log.d(TAG, "Invalid layout.");newLayout = getDefaultLayout();sets = newLayout.split(GRAVITY_SEPARATOR, 3);}String[] start = sets[0].split(BUTTON_SEPARATOR);String[] center = sets[1].split(BUTTON_SEPARATOR);String[] end = sets[2].split(BUTTON_SEPARATOR);// Inflate these in start to end order or accessibility traversal will be messed up.inflateButtons(start, mHorizontal.findViewById(R.id.ends_group),false /* landscape */, true /* start */);inflateButtons(start, mVertical.findViewById(R.id.ends_group),true /* landscape */, true /* start */);inflateButtons(center, mHorizontal.findViewById(R.id.center_group),false /* landscape */, false /* start */);inflateButtons(center, mVertical.findViewById(R.id.center_group),true /* landscape */, false /* start */);addGravitySpacer(mHorizontal.findViewById(R.id.ends_group));addGravitySpacer(mVertical.findViewById(R.id.ends_group));inflateButtons(end, mHorizontal.findViewById(R.id.ends_group),false /* landscape */, false /* start */);inflateButtons(end, mVertical.findViewById(R.id.ends_group),true /* landscape */, false /* start */);updateButtonDispatchersCurrentView();}private void inflateButtons(String[] buttons, ViewGroup parent, boolean landscape,boolean start) {for (int i = 0; i < buttons.length; i++) {Log.d(TAG,"inflateButtons buttons[i]:"+buttons[i]+"  landscape:"+landscape+"    start:"+start);inflateButton(buttons[i], parent, landscape, start);}}

创建 子view:createView

@Nullableprotected View inflateButton(String buttonSpec, ViewGroup parent, boolean landscape,boolean start) {LayoutInflater inflater = landscape ? mLandscapeInflater : mLayoutInflater;View v = createView(buttonSpec, parent, inflater);if (v == null) return null;v = applySize(v, buttonSpec, landscape, start);parent.addView(v);addToDispatchers(v);View lastView = landscape ? mLastLandscape : mLastPortrait;View accessibilityView = v;if (v instanceof ReverseRelativeLayout) {accessibilityView = ((ReverseRelativeLayout) v).getChildAt(0);}if (lastView != null) {accessibilityView.setAccessibilityTraversalAfter(lastView.getId());}if (landscape) {mLastLandscape = accessibilityView;} else {mLastPortrait = accessibilityView;}return v;}

根据配置中的功能按键 名字字符串，加载对应的布局，也就是加载了view 到 NavigationBarView

View createView(String buttonSpec, ViewGroup parent, LayoutInflater inflater) {Log.d(TAG,"createView   buttonSpec:"+buttonSpec);View v = null;String button = extractButton(buttonSpec);if (LEFT.equals(button)) {button = extractButton(NAVSPACE);} else if (RIGHT.equals(button)) {button = extractButton(MENU_IME_ROTATE);}if (HOME.equals(button)) {v = inflater.inflate(R.layout.home, parent, false);} else if (BACK.equals(button)) {v = inflater.inflate(R.layout.back, parent, false);} else if (RECENT.equals(button)) {v = inflater.inflate(R.layout.recent_apps, parent, false);} else if (MENU_IME_ROTATE.equals(button)) {v = inflater.inflate(R.layout.menu_ime, parent, false);} else if (NAVSPACE.equals(button)) {v = inflater.inflate(R.layout.nav_key_space, parent, false);} else if (CLIPBOARD.equals(button)) {v = inflater.inflate(R.layout.clipboard, parent, false);} else if (CONTEXTUAL.equals(button)) {v = inflater.inflate(R.layout.contextual, parent, false);} else if (HOME_HANDLE.equals(button)) {v = inflater.inflate(R.layout.home_handle, parent, false);} else if (IME_SWITCHER.equals(button)) {v = inflater.inflate(R.layout.ime_switcher, parent, false);//huanghb add} else if (VOLUME_ADD.equals(button)) {v = inflater.inflate(R.layout.volume_add, parent, false);} else if (VOLUME_SUB.equals(button)) {v = inflater.inflate(R.layout.volume_sub, parent, false);} else if (SCREENSHOT.equals(button)) {v = inflater.inflate(R.layout.screenshot, parent, false);} //wangfangchen add else if (POWER.equals(button)) {v = inflater.inflate(R.layout.power, parent, false);} //wangfangchen end else if (WB_SUNNY.equals(button)) {v = inflater.inflate(R.layout.wb_sunny, parent, false);} else if (button.startsWith(KEY)) {Log.d(TAG,"createView   buttonSpec:"+buttonSpec+"   button:"+button+"   KEY:"+KEY);String uri = extractImage(button);int code = extractKeycode(button);v = inflater.inflate(R.layout.custom_key, parent, false);((KeyButtonView) v).setCode(code);if (uri != null) {if (uri.contains(":")) {((KeyButtonView) v).loadAsync(Icon.createWithContentUri(uri));} else if (uri.contains("/")) {int index = uri.indexOf('/');String pkg = uri.substring(0, index);int id = Integer.parseInt(uri.substring(index + 1));((KeyButtonView) v).loadAsync(Icon.createWithResource(pkg, id));}}}return v;}

加载布局View NavigationBarInflaterView

上面已经分析了NavigationBarInflaterView 如何加载子功能按键，那么这个View 是在哪里已经并初始化呢？
看布局：navigation_bar.xm

<?xml version="1.0" encoding="utf-8"?>
<com.android.systemui.navigationbar.NavigationBarViewxmlns:android="http://schemas.android.com/apk/res/android"android:id="@+id/navigation_bar_view"android:layout_height="match_parent"android:layout_width="match_parent"android:clipChildren="false"android:clipToPadding="false"android:background="@drawable/system_bar_background"><com.android.systemui.navigationbar.NavigationBarInflaterViewandroid:id="@+id/navigation_inflater"android:layout_width="match_parent"android:layout_height="match_parent"android:clipChildren="false"android:clipToPadding="false" /></com.android.systemui.navigationbar.NavigationBarView>

找navigation_bar.xml 加载地方
1）NavigationBar.java oreateView 方法

备注：NavigationBar 就暂时不分析了，可以参考其它博客或自己的System UI加载流程。

NavigationBarView View的封装

上面分析 NavigationBarView 嵌套了 NavigationBarInflaterView，也就是对NavigationBarInflaterView 的一层封装，

private final SparseArray<ButtonDispatcher> mButtonDispatchers = new SparseArray<>();
放置：view 到数组//huanghb addmButtonDispatchers.put(R.id.volume_add, new ButtonDispatcher(R.id.volume_add));mButtonDispatchers.put(R.id.volume_sub, new ButtonDispatcher(R.id.volume_sub));mButtonDispatchers.put(R.id.screenshot, new ButtonDispatcher(R.id.screenshot));mButtonDispatchers.put(R.id.wb_sunny, new ButtonDispatcher(R.id.wb_sunny));//huanghb end//wangfangchen add		mButtonDispatchers.put(R.id.power, new ButtonDispatcher(R.id.power));//wangfangchen end		

从通过view 数组，获取子view

      return mButtonDispatchers.get(R.id.recent_apps);}public ButtonDispatcher getBackButton() {return mButtonDispatchers.get(R.id.back);}public ButtonDispatcher getHomeButton() {return mButtonDispatchers.get(R.id.home);}public ButtonDispatcher getImeSwitchButton() {return mButtonDispatchers.get(R.id.ime_switcher);}public ButtonDispatcher getAccessibilityButton() {return mButtonDispatchers.get(R.id.accessibility_button);}这不就是对子菜单功能按键的一层封装吗？	

子布局显示并控制NavigationBar

在上面已经通过分析了布局，反向关联了NavigationBarInflaterView 加载->NavigationBar 加载。就从这个角度来分析布局显示出来后如何控制。

看部分相关方法并分析

准备View prepareNavigationBarView()

  private void prepareNavigationBarView() {Log.d(TAG,"prepareNavigationBarView");mNavigationBarView.reorient();ButtonDispatcher recentsButton = mNavigationBarView.getRecentsButton();recentsButton.setOnClickListener(this::onRecentsClick);recentsButton.setOnTouchListener(this::onRecentsTouch);ButtonDispatcher homeButton = mNavigationBarView.getHomeButton();homeButton.setOnTouchListener(this::onHomeTouch);reconfigureHomeLongClick();ButtonDispatcher accessibilityButton = mNavigationBarView.getAccessibilityButton();accessibilityButton.setOnClickListener(this::onAccessibilityClick);accessibilityButton.setOnLongClickListener(this::onAccessibilityLongClick);updateAccessibilityServicesState(mAccessibilityManager);ButtonDispatcher imeSwitcherButton = mNavigationBarView.getImeSwitchButton();imeSwitcherButton.setOnClickListener(this::onImeSwitcherClick);updateScreenPinningGestures();//huanghb add//Log.d("huanghb","prepareNavigationBarView");ShowVolumeButton();ShowScreenShotButton();ShowWbSunnyButton();//huanghb end//wangfangchen add ShowPowerButton();//wangfangchen end }

设置点击事件 长按事件

//wangfangchen add private void ShowPowerButton(){Log.d(TAG,"ShowPowerButton");ButtonDispatcher powerButton = mNavigationBarView.getPowerButton();// String customScreenshot = SystemProperties.get("persist.fise.screenshot.icon","0");powerButton.setOnClickListener(this::onPowerClick);//powerButton.setOnTouchListener(this::onScreenShotTouch);powerButton.setOnLongClickListener(this::onPowerLongClick);powerButton.setVisibility(View.VISIBLE); }//wangfangchen end 	//wangfangchen add private void onPowerClick(View v) {Log.d(TAG,"onPowerClick");mHandler.removeCallbacks(mPower);mHandler.postDelayed(mPower , 200);}private boolean onPowerLongClick(View v) {Log.d(TAG,"onPowerLongClick");setActionNavigationbar();mHandler.removeCallbacks(mPowerReboot);mHandler.postDelayed(mPowerReboot, 200);return  true;}//wangfangchen end 

在对应的线程里面执行逻辑即可

总结

上面分析就很明朗了，需要搞清楚
1）功能按键 布局，如何加载
2）配置 功能菜单 ，如何配置
2）三个类：NavigationBarView NavigationBar NavigationBarInflaterView 联系