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      1 /*
      2  * Copyright (C) 2012 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 com.android.location.fused;
     18 
     19 
     20 import java.io.FileDescriptor;
     21 import java.io.PrintWriter;
     22 
     23 import com.android.location.provider.LocationProviderBase;
     24 import com.android.location.provider.ProviderPropertiesUnbundled;
     25 import com.android.location.provider.ProviderRequestUnbundled;
     26 
     27 import android.content.BroadcastReceiver;
     28 import android.content.Context;
     29 import android.content.Intent;
     30 import android.content.IntentFilter;
     31 import android.location.Criteria;
     32 import android.location.LocationProvider;
     33 import android.os.Bundle;
     34 import android.os.Handler;
     35 import android.os.Looper;
     36 import android.os.Message;
     37 import android.os.UserHandle;
     38 import android.os.WorkSource;
     39 
     40 public class FusedLocationProvider extends LocationProviderBase implements FusionEngine.Callback {
     41     private static final String TAG = "FusedLocationProvider";
     42 
     43     private static ProviderPropertiesUnbundled PROPERTIES = ProviderPropertiesUnbundled.create(
     44             false, false, false, false, true, true, true, Criteria.POWER_LOW,
     45             Criteria.ACCURACY_FINE);
     46 
     47     private static final int MSG_ENABLE = 1;
     48     private static final int MSG_DISABLE = 2;
     49     private static final int MSG_SET_REQUEST = 3;
     50 
     51     private final Context mContext;
     52     private final FusionEngine mEngine;
     53 
     54     private static class RequestWrapper {
     55         public ProviderRequestUnbundled request;
     56         public WorkSource source;
     57         public RequestWrapper(ProviderRequestUnbundled request, WorkSource source) {
     58             this.request = request;
     59             this.source = source;
     60         }
     61     }
     62 
     63     public FusedLocationProvider(Context context) {
     64         super(TAG, PROPERTIES);
     65         mContext = context;
     66         mEngine = new FusionEngine(context, Looper.myLooper());
     67 
     68         // listen for user change
     69         IntentFilter intentFilter = new IntentFilter();
     70         intentFilter.addAction(Intent.ACTION_USER_SWITCHED);
     71         mContext.registerReceiverAsUser(new BroadcastReceiver() {
     72             @Override
     73             public void onReceive(Context context, Intent intent) {
     74                 String action = intent.getAction();
     75                 if (Intent.ACTION_USER_SWITCHED.equals(action)) {
     76                     mEngine.switchUser();
     77                 }
     78             }
     79         }, UserHandle.ALL, intentFilter, null, mHandler);
     80     }
     81 
     82     /**
     83      * For serializing requests to mEngine.
     84      */
     85     private Handler mHandler = new Handler() {
     86         @Override
     87         public void handleMessage(Message msg) {
     88             switch (msg.what) {
     89                 case MSG_ENABLE:
     90                     mEngine.init(FusedLocationProvider.this);
     91                     break;
     92                 case MSG_DISABLE:
     93                     mEngine.deinit();
     94                     break;
     95                 case MSG_SET_REQUEST:
     96                     {
     97                         RequestWrapper wrapper = (RequestWrapper) msg.obj;
     98                         mEngine.setRequest(wrapper.request, wrapper.source);
     99                         break;
    100                     }
    101             }
    102         }
    103     };
    104 
    105     @Override
    106     public void onEnable() {
    107         mHandler.sendEmptyMessage(MSG_ENABLE);
    108     }
    109 
    110     @Override
    111     public void onDisable() {
    112         mHandler.sendEmptyMessage(MSG_DISABLE);
    113     }
    114 
    115     @Override
    116     public void onSetRequest(ProviderRequestUnbundled request, WorkSource source) {
    117         mHandler.obtainMessage(MSG_SET_REQUEST, new RequestWrapper(request, source)).sendToTarget();
    118     }
    119 
    120     @Override
    121     public void onDump(FileDescriptor fd, PrintWriter pw, String[] args) {
    122         // perform synchronously
    123         mEngine.dump(fd, pw, args);
    124     }
    125 
    126     @Override
    127     public int onGetStatus(Bundle extras) {
    128         return LocationProvider.AVAILABLE;
    129     }
    130 
    131     @Override
    132     public long onGetStatusUpdateTime() {
    133         return 0;
    134     }
    135 }
    136