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
17package com.android.location.provider;
18
19import android.annotation.NonNull;
20import android.hardware.location.IActivityRecognitionHardware;
21import android.hardware.location.IActivityRecognitionHardwareClient;
22import android.os.Binder;
23import android.os.IBinder;
24import android.os.Process;
25import android.os.RemoteException;
26import android.util.Log;
27
28/**
29 * A client class for interaction with an Activity-Recognition provider.
30 */
31public abstract class ActivityRecognitionProviderClient {
32    private static final String TAG = "ArProviderClient";
33
34    protected ActivityRecognitionProviderClient() {}
35
36    private IActivityRecognitionHardwareClient.Stub mClient =
37            new IActivityRecognitionHardwareClient.Stub() {
38                @Override
39                public void onAvailabilityChanged(
40                        boolean isSupported,
41                        IActivityRecognitionHardware instance) {
42                    int callingUid = Binder.getCallingUid();
43                    if (callingUid != Process.SYSTEM_UID) {
44                        Log.d(TAG, "Ignoring calls from non-system server. Uid: " + callingUid);
45                        return;
46                    }
47                    ActivityRecognitionProvider provider;
48                    try {
49                        provider = isSupported ? new ActivityRecognitionProvider(instance) : null;
50                    } catch (RemoteException e) {
51                        Log.e(TAG, "Error creating Hardware Activity-Recognition Provider.", e);
52                        return;
53                    }
54                    onProviderChanged(isSupported, provider);
55                }
56            };
57
58    /**
59     * Gets the binder needed to interact with proxy provider in the platform.
60     */
61    @NonNull
62    public IBinder getBinder() {
63        return mClient;
64    }
65
66    /**
67     * Called when a change in the availability of {@link ActivityRecognitionProvider} is detected.
68     *
69     * @param isSupported whether the platform supports the provider natively
70     * @param instance the available provider's instance
71     */
72    public abstract void onProviderChanged(
73            boolean isSupported,
74            ActivityRecognitionProvider instance);
75}
76