1/* 2 * Copyright (C) 2014 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.annotation.Nullable; 21import android.hardware.location.IActivityRecognitionHardware; 22import android.hardware.location.IActivityRecognitionHardwareWatcher; 23import android.os.Binder; 24import android.os.IBinder; 25import android.os.Process; 26import android.os.RemoteException; 27import android.util.Log; 28 29/** 30 * A watcher class for Activity-Recognition instances. 31 */ 32public class ActivityRecognitionProviderWatcher { 33 private static final String TAG = "ActivityRecognitionProviderWatcher"; 34 35 private static ActivityRecognitionProviderWatcher sWatcher; 36 private static final Object sWatcherLock = new Object(); 37 38 private ActivityRecognitionProvider mActivityRecognitionProvider; 39 40 private ActivityRecognitionProviderWatcher() {} 41 42 public static ActivityRecognitionProviderWatcher getInstance() { 43 synchronized (sWatcherLock) { 44 if (sWatcher == null) { 45 sWatcher = new ActivityRecognitionProviderWatcher(); 46 } 47 return sWatcher; 48 } 49 } 50 51 private IActivityRecognitionHardwareWatcher.Stub mWatcherStub = 52 new IActivityRecognitionHardwareWatcher.Stub() { 53 @Override 54 public void onInstanceChanged(IActivityRecognitionHardware instance) { 55 int callingUid = Binder.getCallingUid(); 56 if (callingUid != Process.SYSTEM_UID) { 57 Log.d(TAG, "Ignoring calls from non-system server. Uid: " + callingUid); 58 return; 59 } 60 61 try { 62 mActivityRecognitionProvider = new ActivityRecognitionProvider(instance); 63 } catch (RemoteException e) { 64 Log.e(TAG, "Error creating Hardware Activity-Recognition", e); 65 } 66 } 67 }; 68 69 /** 70 * Gets the binder needed to interact with proxy provider in the platform. 71 */ 72 @NonNull 73 public IBinder getBinder() { 74 return mWatcherStub; 75 } 76 77 /** 78 * Gets an object that supports the functionality of {@link ActivityRecognitionProvider}. 79 * 80 * @return Non-null value if the functionality is supported by the platform, false otherwise. 81 */ 82 @Nullable 83 public ActivityRecognitionProvider getActivityRecognitionProvider() { 84 return mActivityRecognitionProvider; 85 } 86} 87