1 /* 2 * Copyright (C) 2015 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package android.support.car; 18 19 import android.content.Context; 20 import android.os.Handler; 21 22 /** 23 * CarServiceLoader is the abstraction for loading different types of car service. 24 * @hide 25 */ 26 public abstract class CarServiceLoader { 27 28 private final Context mContext; 29 private final CarConnectionCallbackProxy mCallback; 30 private final Handler mEventHandler; 31 CarServiceLoader(Context context, CarConnectionCallbackProxy callback, Handler handler)32 public CarServiceLoader(Context context, CarConnectionCallbackProxy callback, Handler handler) { 33 mContext = context; 34 mCallback = callback; 35 mEventHandler = handler; 36 } 37 connect()38 public abstract void connect() throws IllegalStateException; disconnect()39 public abstract void disconnect(); isConnected()40 public abstract boolean isConnected(); 41 42 @Car.ConnectionType getCarConnectionType()43 public abstract int getCarConnectionType() throws CarNotConnectedException; 44 45 /** 46 * Retrieves a manager object for a specified Car*Manager. 47 * @param serviceName One of the android.car.Car#*_SERVICE constants. 48 * @return An instance of the request manager. Null if the manager is not supported on the 49 * current vehicle. 50 * @throws CarNotConnectedException if the connection to the car service has been lost. 51 */ getCarManager(String serviceName)52 public abstract Object getCarManager(String serviceName) throws CarNotConnectedException; 53 getContext()54 protected Context getContext() { 55 return mContext; 56 } 57 getConnectionCallback()58 protected CarConnectionCallbackProxy getConnectionCallback() { 59 return mCallback; 60 } 61 getEventHandler()62 protected Handler getEventHandler() { 63 return mEventHandler; 64 } 65 66 /** 67 * Wrapper for CarConnectionCallback which does not return a {@link android.support.car.Car} 68 * object. 69 */ 70 public abstract static class CarConnectionCallbackProxy { 71 72 /** 73 * Called when the Car has been connected. Does not guarantee the car is still connected 74 * while this callback is running, so {@link CarNotConnectedException}s may still be 75 * thrown from {@link Car} method calls. 76 */ onConnected()77 public abstract void onConnected(); 78 /** 79 * Called when the Car has been disconnected. 80 */ onDisconnected()81 public abstract void onDisconnected(); 82 } 83 } 84