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      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 
     17 package com.android.nfc.beam;
     18 
     19 import android.app.Service;
     20 import android.bluetooth.BluetoothAdapter;
     21 import android.content.BroadcastReceiver;
     22 import android.content.Context;
     23 import android.content.Intent;
     24 import android.content.IntentFilter;
     25 import android.os.Handler;
     26 import android.os.IBinder;
     27 import android.os.Message;
     28 import android.os.Messenger;
     29 import android.os.RemoteException;
     30 import android.util.Log;
     31 
     32 public class BeamSendService extends Service implements BeamTransferManager.Callback {
     33     private static String TAG = "BeamSendService";
     34     private static boolean DBG = true;
     35 
     36     public static String EXTRA_BEAM_TRANSFER_RECORD
     37             = "com.android.nfc.beam.EXTRA_BEAM_TRANSFER_RECORD";
     38     public static final String EXTRA_BEAM_COMPLETE_CALLBACK
     39             = "com.android.nfc.beam.TRANSFER_COMPLETE_CALLBACK";
     40 
     41     private BeamTransferManager mTransferManager;
     42     private BeamStatusReceiver mBeamStatusReceiver;
     43     private boolean mBluetoothEnabledByNfc;
     44     private Messenger mCompleteCallback;
     45     private int mStartId;
     46 
     47     private final BluetoothAdapter mBluetoothAdapter;
     48     private final BroadcastReceiver mBluetoothStateReceiver = new BroadcastReceiver() {
     49         @Override
     50         public void onReceive(Context context, Intent intent) {
     51             String action = intent.getAction();
     52             if (action.equals(BluetoothAdapter.ACTION_STATE_CHANGED)) {
     53                 handleBluetoothStateChanged(intent);
     54             }
     55         }
     56     };
     57 
     58     public BeamSendService() {
     59         mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
     60     }
     61 
     62     @Override
     63     public void onCreate() {
     64         super.onCreate();
     65 
     66         // register BT state receiver
     67         IntentFilter filter = new IntentFilter(BluetoothAdapter.ACTION_STATE_CHANGED);
     68         registerReceiver(mBluetoothStateReceiver, filter);
     69     }
     70 
     71     @Override
     72     public void onDestroy() {
     73         super.onDestroy();
     74 
     75         if (mBeamStatusReceiver != null) {
     76             unregisterReceiver(mBeamStatusReceiver);
     77         }
     78         unregisterReceiver(mBluetoothStateReceiver);
     79     }
     80 
     81     @Override
     82     public int onStartCommand(Intent intent, int flags, int startId) {
     83         mStartId = startId;
     84 
     85         BeamTransferRecord transferRecord;
     86         if (intent == null ||
     87                 (transferRecord = intent.getParcelableExtra(EXTRA_BEAM_TRANSFER_RECORD)) == null) {
     88             if (DBG) Log.e(TAG, "No transfer record provided. Stopping.");
     89             stopSelf(startId);
     90             return START_NOT_STICKY;
     91         }
     92 
     93         mCompleteCallback = intent.getParcelableExtra(EXTRA_BEAM_COMPLETE_CALLBACK);
     94 
     95         if (doTransfer(transferRecord)) {
     96             if (DBG) Log.i(TAG, "Starting outgoing Beam transfer");
     97             return START_STICKY;
     98         } else {
     99             invokeCompleteCallback(false);
    100             stopSelf(startId);
    101             return START_NOT_STICKY;
    102         }
    103     }
    104 
    105     boolean doTransfer(BeamTransferRecord transferRecord) {
    106         if (createBeamTransferManager(transferRecord)) {
    107             // register Beam status receiver
    108             mBeamStatusReceiver = new BeamStatusReceiver(this, mTransferManager);
    109             registerReceiver(mBeamStatusReceiver, mBeamStatusReceiver.getIntentFilter(),
    110                     BeamStatusReceiver.BEAM_STATUS_PERMISSION, new Handler());
    111 
    112             if (transferRecord.dataLinkType == BeamTransferRecord.DATA_LINK_TYPE_BLUETOOTH) {
    113                 if (mBluetoothAdapter.isEnabled()) {
    114                     // Start the transfer
    115                     mTransferManager.start();
    116                 } else {
    117                     if (!mBluetoothAdapter.enableNoAutoConnect()) {
    118                         Log.e(TAG, "Error enabling Bluetooth.");
    119                         mTransferManager = null;
    120                         return false;
    121                     }
    122                     mBluetoothEnabledByNfc = true;
    123                     if (DBG) Log.d(TAG, "Queueing out transfer "
    124                             + Integer.toString(transferRecord.id));
    125                 }
    126             }
    127             return true;
    128         }
    129 
    130         return false;
    131     }
    132 
    133     boolean createBeamTransferManager(BeamTransferRecord transferRecord) {
    134         if (mTransferManager != null) {
    135             return false;
    136         }
    137 
    138         if (transferRecord.dataLinkType != BeamTransferRecord.DATA_LINK_TYPE_BLUETOOTH) {
    139             // only support BT
    140             return false;
    141         }
    142 
    143         mTransferManager = new BeamTransferManager(this, this, transferRecord, false);
    144         mTransferManager.updateNotification();
    145         return true;
    146     }
    147 
    148     private void handleBluetoothStateChanged(Intent intent) {
    149         int state = intent.getIntExtra(BluetoothAdapter.EXTRA_STATE,
    150                 BluetoothAdapter.ERROR);
    151         if (state == BluetoothAdapter.STATE_ON) {
    152             if (mTransferManager != null &&
    153                     mTransferManager.mDataLinkType == BeamTransferRecord.DATA_LINK_TYPE_BLUETOOTH) {
    154                 mTransferManager.start();
    155             }
    156         } else if (state == BluetoothAdapter.STATE_OFF) {
    157             mBluetoothEnabledByNfc = false;
    158         }
    159     }
    160 
    161     private void invokeCompleteCallback(boolean success) {
    162         if (mCompleteCallback != null) {
    163             try {
    164                 Message msg = Message.obtain(null, BeamManager.MSG_BEAM_COMPLETE);
    165                 msg.arg1 = success ? 1 : 0;
    166                 mCompleteCallback.send(msg);
    167             } catch (RemoteException e) {
    168                 Log.e(TAG, "failed to invoke Beam complete callback", e);
    169             }
    170         }
    171     }
    172 
    173     @Override
    174     public void onTransferComplete(BeamTransferManager transfer, boolean success) {
    175         // Play success sound
    176         if (!success) {
    177             if (DBG) Log.d(TAG, "Transfer failed, final state: " +
    178                     Integer.toString(transfer.mState));
    179         }
    180 
    181         if (mBluetoothEnabledByNfc) {
    182             mBluetoothEnabledByNfc = false;
    183             mBluetoothAdapter.disable();
    184         }
    185 
    186         invokeCompleteCallback(success);
    187         stopSelf(mStartId);
    188     }
    189 
    190     @Override
    191     public IBinder onBind(Intent intent) {
    192         return null;
    193     }
    194 }
    195