adb shell am broadcast -a android.car.intent.action.TOGGLE_HVAC_CONTROLS

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.android.car.hvac">

    <uses-sdk
        android:minSdkVersion="22"
        android:targetSdkVersion="29" />

    <uses-permission android:name="android.car.permission.CONTROL_CAR_CLIMATE" />
    <uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />
    <!-- Required to use the TYPE_DISPLAY_OVERLAY layout param for the overlay hvac ui-->
    <uses-permission android:name="android.permission.INTERNAL_SYSTEM_WINDOW" />
    <!-- Allow Hvac to go across all users-->
    <uses-permission android:name="android.permission.INTERACT_ACROSS_USERS" />
    <uses-permission android:name="android.permission.INTERACT_ACROSS_USERS_FULL" />

    <protected-broadcast android:name="android.car.intent.action.TOGGLE_HVAC_CONTROLS" />

    <application
        android:icon="@drawable/ic_launcher_hvac"
        android:label="@string/hvac_label"
        android:persistent="true">

        <!--用于控制空調(diào)功能的Service-->
        <service
            android:name=".HvacController"
            android:exported="false"
            android:singleUser="true" />
        <!-- 用于顯示UI的Service-->
        <service
            android:name=".HvacUiService"
            android:exported="false"
            android:singleUser="true" />

        <!-- 監(jiān)聽開機(jī)廣播 -->
        <receiver
            android:name=".BootCompleteReceiver"
            android:exported="true">
            <intent-filter>
                <action android:name="android.intent.action.BOOT_COMPLETED" />
            </intent-filter>
        </receiver>
    </application>
</manifest>

public class BootCompleteReceiver extends BroadcastReceiver {
    @Override
    public void onReceive(Context context, Intent intent) {
        Intent hvacUiService = new Intent(context, HvacUiService.class);
        context.startService(hvacUiService);
    }
}

@Override
public void onCreate() {
    ...
    // 由于不存在從服務(wù)內(nèi)部獲取系統(tǒng)ui可見性的方法，因此我們將全屏放置一些東西，并檢查其最終測(cè)量結(jié)果，作為獲取該信息的黑客手段。
    // 一旦我們有了初始狀態(tài)，我們就可以安全地從那時(shí)開始注冊(cè)更改事件。
    View windowSizeTest = new View(this) {
        @Override
        protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
            Log.i(TAG, "onLayout: changed" + changed + ";left:" + left + ";top:" + top + ";right:" + right + ";bottom" + bottom);
            boolean sysUIShowing = (mDisplayMetrics.heightPixels != bottom);
            mInitialYOffset = (sysUIShowing) ? -mNavBarHeight : 0;
            Log.i(TAG, "onLayout: sysUIShowing:" + sysUIShowing + ";mInitialYOffset" + mInitialYOffset);
            layoutHvacUi();
            // 我們現(xiàn)在有了初始狀態(tài)，因此不再需要這個(gè)空視圖。
            mWindowManager.removeView(this);
            mAddedViews.remove(this);
        }
    };
    addViewToWindowManagerAndTrack(windowSizeTest, testparams);

    // 接收事件的廣播
    IntentFilter filter = new IntentFilter();
    filter.addAction(CAR_INTENT_ACTION_TOGGLE_HVAC_CONTROLS);
    filter.addAction(Intent.ACTION_CLOSE_SYSTEM_DIALOGS);
    // 注冊(cè)接收器，以便任何具有CONTROL_CAR_CLIMATE權(quán)限的用戶都可以調(diào)用它。
    registerReceiverAsUser(mBroadcastReceiver, UserHandle.ALL, filter,
            Car.PERMISSION_CONTROL_CAR_CLIMATE, null);
}

private BroadcastReceiver mBroadcastReceiver = new BroadcastReceiver() {
    @Override
    public void onReceive(Context context, Intent intent) {
        String action = intent.getAction();
        Log.i(TAG, "onReceive: " + action);
        // 自定義廣播，用于展開Hvac的HMI
        if (action.equals(CAR_INTENT_ACTION_TOGGLE_HVAC_CONTROLS)) {
            mHvacPanelController.toggleHvacUi();
        } else if (action.equals(Intent.ACTION_CLOSE_SYSTEM_DIALOGS)) {
        // home 按鍵的廣播，收起Hvac的HMI
            mHvacPanelController.collapseHvacUi();
        }
    }
};

// 添加View到WindowManager中
private void addViewToWindowManagerAndTrack(View view, WindowManager.LayoutParams params) {
    mWindowManager.addView(view, params);
    mAddedViews.add(view);
}

/**
 * 在確定最小偏移量后調(diào)用。
 * 這將生成HVAC UI所需的所有組件的布局。
 * 啟動(dòng)時(shí)，折疊視圖所需的所有窗口都可見，而展開視圖的窗口已創(chuàng)建并調(diào)整大小，但不可見。
 */
private void layoutHvacUi() {
    LayoutInflater inflater = (LayoutInflater) getSystemService(LAYOUT_INFLATER_SERVICE);
    WindowManager.LayoutParams params = new WindowManager.LayoutParams(
            WindowManager.LayoutParams.WRAP_CONTENT,
            WindowManager.LayoutParams.WRAP_CONTENT,
            WindowManager.LayoutParams.TYPE_DISPLAY_OVERLAY,
            WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE
                    | WindowManager.LayoutParams.FLAG_LAYOUT_NO_LIMITS
                    & ~WindowManager.LayoutParams.FLAG_WATCH_OUTSIDE_TOUCH,
            PixelFormat.TRANSLUCENT);

    params.packageName = this.getPackageName();
    params.gravity = Gravity.BOTTOM | Gravity.LEFT;
    params.x = 0;
    params.y = mInitialYOffset;
    params.width = mScreenWidth;
    params.height = mScreenBottom;
    params.setTitle("HVAC Container");
    disableAnimations(params);
    // required of the sysui visiblity listener is not triggered.
    params.hasSystemUiListeners = true;

    mContainer = inflater.inflate(R.layout.hvac_panel, null);
    mContainer.setLayoutParams(params);
    mContainer.setOnSystemUiVisibilityChangeListener(visibility -> {
        Log.i(TAG, "layoutHvacUi: visibility:" + visibility);
        boolean systemUiVisible = (visibility & View.SYSTEM_UI_FLAG_FULLSCREEN) == 0;
        int y = 0;
        if (systemUiVisible) {
            // 當(dāng)systemUi可見時(shí)，窗口系統(tǒng)坐標(biāo)從系統(tǒng)導(dǎo)航欄上方的0開始。因此，如果我們想獲得屏幕底部的實(shí)際高度，我們需要將y值設(shè)置為導(dǎo)航欄高度的負(fù)值。
            y = -mNavBarHeight;
        }
        setYPosition(mDriverTemperatureBar, y);
        setYPosition(mPassengerTemperatureBar, y);
        setYPosition(mDriverTemperatureBarCollapsed, y);
        setYPosition(mPassengerTemperatureBarCollapsed, y);
        setYPosition(mContainer, y);
    });

    // 頂部填充應(yīng)根據(jù)屏幕高度和擴(kuò)展hvac面板的高度進(jìn)行計(jì)算。由填充物定義的空間意味著可以單擊以關(guān)閉hvac面板。
    int topPadding = mScreenBottom - mPanelFullExpandedHeight;
    mContainer.setPadding(0, topPadding, 0, 0);

    mContainer.setFocusable(false);
    mContainer.setFocusableInTouchMode(false);

    View panel = mContainer.findViewById(R.id.hvac_center_panel);
    panel.getLayoutParams().height = mPanelCollapsedHeight;

    addViewToWindowManagerAndTrack(mContainer, params);
    // 創(chuàng)建溫度計(jì)bar
    createTemperatureBars(inflater);

    // UI狀態(tài)控制器，用來(lái)控制展開/收起時(shí)UI的各種狀態(tài)并執(zhí)行動(dòng)畫
    mHvacPanelController = new HvacPanelController(this /* context */, mContainer,
            mWindowManager, mDriverTemperatureBar, mPassengerTemperatureBar,
            mDriverTemperatureBarCollapsed, mPassengerTemperatureBarCollapsed
    );
    // 綁定 HvacController Service
    Intent bindIntent = new Intent(this /* context */, HvacController.class);
    if (!bindService(bindIntent, mServiceConnection, Context.BIND_AUTO_CREATE)) {
        Log.e(TAG, "Failed to connect to HvacController.");
    }
}

private ServiceConnection mServiceConnection = new ServiceConnection() {
    @Override
    public void onServiceConnected(ComponentName className, IBinder service) {
        mHvacController = ((HvacController.LocalBinder) service).getService();
        final Context context = HvacUiService.this;

        final Runnable r = () -> {
            // hvac控制器從車輛刷新其值后，綁定所有值。
            mHvacPanelController.updateHvacController(mHvacController);
        };

        if (mHvacController != null) {
            mHvacController.requestRefresh(r, new Handler(context.getMainLooper()));
        }
    }

    @Override
    public void onServiceDisconnected(ComponentName className) {
        mHvacController = null;
        mHvacPanelController.updateHvacController(null);
        //TODO:b/29126575重新啟動(dòng)后重新連接控制器
    }
};

private FanSpeedBarController mFanSpeedBarController;
private FanDirectionButtonsController mFanDirectionButtonsController;
private TemperatureController mTemperatureController;
private TemperatureController mTemperatureControllerCollapsed;
private SeatWarmerController mSeatWarmerController;

public void updateHvacController(HvacController controller) {
    mHvacController = controller;

    mFanSpeedBarController = new FanSpeedBarController(mFanSpeedBar, mHvacController);
    mFanDirectionButtonsController
            = new FanDirectionButtonsController(mFanDirectionButtons, mHvacController);
    mTemperatureController = new TemperatureController(
            mPassengerTemperatureBarExpanded,
            mDriverTemperatureBarExpanded,
            mPassengerTemperatureBarCollapsed,
            mDriverTemperatureBarCollapsed,
            mHvacController);
    mSeatWarmerController = new SeatWarmerController(mPassengerSeatWarmer,
            mDriverSeatWarmer, mHvacController);

    // 切換按鈕不需要額外的邏輯來(lái)映射硬件和UI設(shè)置。只需使用ToggleListener來(lái)處理點(diǎn)擊。
    mAcButton.setIsOn(mHvacController.getAcState());
    mAcButton.setToggleListener(new ToggleButton.ToggleListener() {
        @Override
        public void onToggled(boolean isOn) {
            mHvacController.setAcState(isOn);
        }
    });
    ...

    setAutoMode(mHvacController.getAutoModeState());

    mHvacPowerSwitch.setIsOn(mHvacController.getHvacPowerState());
    mHvacPowerSwitch.setToggleListener(isOn -> mHvacController.setHvacPowerState(isOn));

    mHvacController.registerCallback(mToggleButtonCallbacks);
    mToggleButtonCallbacks.onHvacPowerChange(mHvacController.getHvacPowerState());
}

public class HvacController extends Service {

    private final Binder mBinder = new LocalBinder();

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        return START_STICKY;
    }

    @Override
    public IBinder onBind(Intent intent) {
        return mBinder;
    }

    public class LocalBinder extends Binder {
        HvacController getService() {
            return HvacController.this;
        }
    }
    ...
}

@Override
public void onCreate() {
    super.onCreate();
    if (getPackageManager().hasSystemFeature(PackageManager.FEATURE_AUTOMOTIVE)) {
        // 連接 CarService
        mCarApiClient = Car.createCar(this, mCarServiceConnection);
        mCarApiClient.connect();
    }
}

private final ServiceConnection mCarServiceConnection = new ServiceConnection() {
    @Override
    public void onServiceConnected(ComponentName name, IBinder service) {
        synchronized (mHvacManagerReady) {
            try {
                // 連接上CarService后，獲取到其中的HvacManager.
                initHvacManager((CarHvacManager) mCarApiClient.getCarManager(Car.HVAC_SERVICE));
                // 連接成功后，喚醒正在等待CarHvacManager的線程
                mHvacManagerReady.notifyAll();
            } catch (CarNotConnectedException e) {
                Log.e(TAG, "Car not connected in onServiceConnected");
            }
        }
    }

    @Override
    public void onServiceDisconnected(ComponentName name) {
    }
};

// HvacUiService.java - mServiceConnection
{
    final Runnable r = () -> {
        // hvac控制器從車輛刷新其值后，綁定所有值。
        mHvacPanelController.updateHvacController(mHvacController);
    };

    if (mHvacController != null) {
        mHvacController.requestRefresh(r, new Handler(context.getMainLooper()));
    }
}

// HvacController.java
public void requestRefresh(final Runnable r, final Handler h) {
    final AsyncTask<Void, Void, Void> task = new AsyncTask<Void, Void, Void>() {
        @Override
        protected Void doInBackground(Void... unused) {
            synchronized (mHvacManagerReady) {
                while (mHvacManager == null) {
                    try {
                        mHvacManagerReady.wait();
                    } catch (InterruptedException e) {
                        // We got interrupted so we might be shutting down.
                        return null;
                    }
                }
            }
            // 刷新數(shù)據(jù)
            fetchTemperature(DRIVER_ZONE_ID);
            fetchTemperature(PASSENGER_ZONE_ID);
            fetchFanSpeed();
            ...
            return null;
        }

        @Override
        protected void onPostExecute(Void unused) {
            // 切換到主線程中執(zhí)行runnable
            h.post(r);
        }
    };
    task.execute();
}

private void fetchFanSpeed() {
    if (mHvacManager != null) {
        int zone = SEAT_ALL; //特定于汽車的解決方法。
        try {
            int speed = mHvacManager.getIntProperty(CarHvacManager.ID_ZONED_FAN_SPEED_SETPOINT, zone);
            mDataStore.setFanSpeed(speed);
        } catch (android.car.CarNotConnectedException e) {
            Log.e(TAG, "Car not connected in fetchFanSpeed");
        }
    }
}

mHvacManager.getIntProperty(CarHvacManager.ID_ZONED_FAN_SPEED_SETPOINT, zone);

private final CarPropertyManager mCarPropertyMgr;

public int getIntProperty(int propertyId, int area) {
    return this.mCarPropertyMgr.getIntProperty(propertyId, area);
}

mHvacManager.registerCallback(mHardwareCallback);

private final CarHvacManager.CarHvacEventCallback mHardwareCallback = new CarHvacManager.CarHvacEventCallback() {
    @Override
    public void onChangeEvent(final CarPropertyValue val) {
        int areaId = val.getAreaId();
        switch (val.getPropertyId()) {
            case CarHvacManager.ID_ZONED_AC_ON:
                handleAcStateUpdate(getValue(val));
                break;
            case CarHvacManager.ID_ZONED_FAN_DIRECTION:
                handleFanPositionUpdate(areaId, getValue(val));
                break;
            case CarHvacManager.ID_ZONED_FAN_SPEED_SETPOINT:
                handleFanSpeedUpdate(areaId, getValue(val));
                break;
            case CarHvacManager.ID_ZONED_TEMP_SETPOINT:
                handleTempUpdate(val);
                break;
            case CarHvacManager.ID_WINDOW_DEFROSTER_ON:
                handleDefrosterUpdate(areaId, getValue(val));
                break;
            case CarHvacManager.ID_ZONED_AIR_RECIRCULATION_ON:
                handleAirCirculationUpdate(getValue(val));
                break;
            case CarHvacManager.ID_ZONED_SEAT_TEMP:
                handleSeatWarmerUpdate(areaId, getValue(val));
                break;
            case CarHvacManager.ID_ZONED_AUTOMATIC_MODE_ON:
                handleAutoModeUpdate(getValue(val));
                break;
            case CarHvacManager.ID_ZONED_HVAC_POWER_ON:
                handleHvacPowerOn(getValue(val));
                break;
            default:
                if (Log.isLoggable(TAG, Log.DEBUG)) {
                    Log.d(TAG, "Unhandled HVAC event, id: " + val.getPropertyId());
                }
        }
    }

    @Override
    public void onErrorEvent(final int propertyId, final int zone) {
    }
};

// 全局屬性，只有一個(gè)
ID_MIRROR_DEFROSTER_ON  //視鏡除霧
ID_STEERING_WHEEL_HEAT  //方向盤溫度
ID_OUTSIDE_AIR_TEMP  //室外溫度
ID_TEMPERATURE_DISPLAY_UNITS  //在使用的溫度
// 區(qū)域?qū)傩裕稍诓煌瑓^(qū)域設(shè)置
ID_ZONED_TEMP_SETPOINT  //用戶設(shè)置的溫度
ID_ZONED_TEMP_ACTUAL  //區(qū)域?qū)嶋H溫度
ID_ZONED_HVAC_POWER_ON  //HVAC系統(tǒng)電源開關(guān)
ID_ZONED_FAN_SPEED_SETPOINT  //風(fēng)扇設(shè)置的速度
ID_ZONED_FAN_SPEED_RPM  //風(fēng)扇實(shí)際的速度
ID_ZONED_FAN_DIRECTION_AVAILABLE  //風(fēng)扇可設(shè)置的方向
ID_ZONED_FAN_DIRECTION  //現(xiàn)在風(fēng)扇設(shè)置的方向
ID_ZONED_SEAT_TEMP  //座椅溫度
ID_ZONED_AC_ON  //空調(diào)開關(guān)
ID_ZONED_AUTOMATIC_MODE_ON  //HVAC自動(dòng)模式開關(guān)
ID_ZONED_AIR_RECIRCULATION_ON  //空氣循環(huán)開關(guān)
ID_ZONED_MAX_AC_ON  //空調(diào)最大速度開關(guān)
ID_ZONED_DUAL_ZONE_ON  //雙區(qū)模式開關(guān)
ID_ZONED_MAX_DEFROST_ON  //最大除霧開關(guān)
ID_ZONED_HVAC_AUTO_RECIRC_ON  //自動(dòng)循環(huán)模式開關(guān)
ID_WINDOW_DEFROSTER_ON  //除霧模式開關(guān)

@GuardedBy("mFanSpeed")
private Integer mFanSpeed = 0;
private static final long COALESCE_TIME_MS = 0L;

public int getFanSpeed() {
    synchronized (mFanSpeed) {
        return mFanSpeed;
    }
}

// 僅用于主動(dòng) 獲取、設(shè)定 數(shù)據(jù)時(shí)更新speed數(shù)據(jù)。
public void setFanSpeed(int speed) {
    synchronized (mFanSpeed) {
        mFanSpeed = speed;
        mLastFanSpeedSet = SystemClock.uptimeMillis();
    }
}

// 從callback中得到數(shù)據(jù)時(shí)，因?yàn)閿?shù)據(jù)可能會(huì)刷新的很頻繁，所以需要先判斷時(shí)間戳，確定數(shù)據(jù)是否真的需要更新
public boolean shouldPropagateFanSpeedUpdate(int zone, int speed) {
    // TODO：我們暫時(shí)忽略風(fēng)扇速度區(qū)域，因?yàn)槲覀儧]有多區(qū)域車。
    synchronized (mFanSpeed) {
        if (SystemClock.uptimeMillis() - mLastFanSpeedSet < COALESCE_TIME_MS) {
            return false;
        }
        mFanSpeed = speed;
    }
    return true;
}

// HvacController.java
private final CarHvacManager.CarHvacEventCallback mHardwareCallback = new CarHvacManager.CarHvacEventCallback() {
    @Override
    public void onChangeEvent(final CarPropertyValue val) {
        int areaId = val.getAreaId();
        switch (val.getPropertyId()) {
            case CarHvacManager.ID_ZONED_FAN_SPEED_SETPOINT:
                // 處理來(lái)自callback的數(shù)據(jù)
                handleFanSpeedUpdate(areaId, getValue(val));
                break;
                // ... 省略
            default:
                if (Log.isLoggable(TAG, Log.DEBUG)) {
                    Log.d(TAG, "Unhandled HVAC event, id: " + val.getPropertyId());
                }
        }
    }
};

private void handleFanSpeedUpdate(int zone, int speed) {
    // 判斷是否需要更新本地的數(shù)據(jù)
    boolean shouldPropagate = mDataStore.shouldPropagateFanSpeedUpdate(zone, speed);
    if (Log.isLoggable(TAG, Log.DEBUG)) {
        Log.d(TAG, "Fan Speed Update, zone: " + zone + " speed: " + speed +
                " should propagate: " + shouldPropagate);
    }
    if (shouldPropagate) {
        // 將更新后的數(shù)據(jù)回調(diào)給各個(gè)UI控制器
        synchronized (mCallbacks) {
            for (int i = 0; i < mCallbacks.size(); i++) {
                mCallbacks.get(i).onFanSpeedChange(speed);
            }
        }
    }
}

public void setFanSpeed(final int fanSpeed) {
    // 更新當(dāng)前的數(shù)據(jù)
    mDataStore.setFanSpeed(fanSpeed);

    final AsyncTask<Void, Void, Void> task = new AsyncTask<Void, Void, Void>() {
        int newFanSpeed;

        protected Void doInBackground(Void... unused) {
            if (mHvacManager != null) {
                int zone = SEAT_ALL; // Car specific workaround.
                try {
                    if (Log.isLoggable(TAG, Log.DEBUG)) {
                        Log.d(TAG, "Setting fanspeed to: " + fanSpeed);
                    }
                    mHvacManager.setIntProperty(
                            CarHvacManager.ID_ZONED_FAN_SPEED_SETPOINT, zone, fanSpeed);

                    newFanSpeed = mHvacManager.getIntProperty(
                            CarHvacManager.ID_ZONED_FAN_SPEED_SETPOINT, zone);
                } catch (android.car.CarNotConnectedException e) {
                    Log.e(TAG, "Car not connected in setFanSpeed");
                }
            }
            return null;
        }
    };
    task.execute();
}