packages/CarSystemUI/src/com/android/systemui/statusbar/car/DrivingStateHelper.java

/*
 * Copyright (C) 2018 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.android.systemui.statusbar.car;

import android.car.Car;
import android.car.drivingstate.CarDrivingStateEvent;
import android.car.drivingstate.CarDrivingStateManager;
import android.car.drivingstate.CarDrivingStateManager.CarDrivingStateEventListener;
import android.util.Log;

import androidx.annotation.NonNull;

import com.android.systemui.car.CarServiceProvider;

import javax.inject.Inject;
import javax.inject.Singleton;

/**
 * Helper class for connecting to the {@link CarDrivingStateManager} and listening for driving state
 * changes.
 */
@Singleton
public class DrivingStateHelper {
    public static final String TAG = "DrivingStateHelper";

    private final CarServiceProvider mCarServiceProvider;

    private CarDrivingStateManager mDrivingStateManager;
    private CarDrivingStateEventListener mDrivingStateHandler;

    @Inject
    public DrivingStateHelper(CarServiceProvider carServiceProvider) {
        mCarServiceProvider = carServiceProvider;
    }

    /**
     * Sets the {@link CarDrivingStateEventListener}. Should be set before calling {@link
     * #connectToCarService()}.
     */
    public void setCarDrivingStateEventListener(
            @NonNull CarDrivingStateEventListener carDrivingStateEventListener) {
        mDrivingStateHandler = carDrivingStateEventListener;
    }

    /**
     * Queries {@link CarDrivingStateManager} for current driving state. Returns {@code true} if car
     * is idling or moving, {@code false} otherwise.
     */
    public boolean isCurrentlyDriving() {
        if (mDrivingStateManager == null) {
            return false;
        }
        CarDrivingStateEvent currentState = mDrivingStateManager.getCurrentCarDrivingState();
        if (currentState != null) {
            return currentState.eventValue == CarDrivingStateEvent.DRIVING_STATE_IDLING
                    || currentState.eventValue == CarDrivingStateEvent.DRIVING_STATE_MOVING;
        }
        return false; // Default to false.
    }

    /**
     * Establishes connection with the Car service.
     */
    public void connectToCarService() {
        mCarServiceProvider.addListener(mCarServiceLifecycleListener);
    }

    private final CarServiceProvider.CarServiceOnConnectedListener mCarServiceLifecycleListener =
            car -> {
                logD("Car Service connected");
                mDrivingStateManager = (CarDrivingStateManager) car.getCarManager(
                        Car.CAR_DRIVING_STATE_SERVICE);
                if (mDrivingStateManager != null) {
                    mDrivingStateManager.registerListener(mDrivingStateHandler);
                    mDrivingStateHandler.onDrivingStateChanged(
                            mDrivingStateManager.getCurrentCarDrivingState());
                } else {
                    Log.e(TAG, "CarDrivingStateService service not available");
                }
            };

    private void logD(String message) {
        if (Log.isLoggable(TAG, Log.DEBUG)) {
            Log.d(TAG, message);
        }
    }
}