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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.nfc.beam;
     18 
     19 import android.bluetooth.BluetoothDevice;
     20 import android.content.Context;
     21 import android.content.Intent;
     22 import android.net.Uri;
     23 import android.os.Handler;
     24 import android.os.Message;
     25 import android.os.SystemClock;
     26 import android.util.Log;
     27 
     28 import java.util.ArrayList;
     29 
     30 public class BluetoothOppHandover implements Handler.Callback {
     31     static final String TAG = "BluetoothOppHandover";
     32     static final boolean DBG = true;
     33 
     34     static final int STATE_INIT = 0;
     35     static final int STATE_TURNING_ON = 1;
     36     static final int STATE_WAITING = 2; // Need to wait for remote side turning on BT
     37     static final int STATE_COMPLETE = 3;
     38 
     39     static final int MSG_START_SEND = 0;
     40 
     41     static final int REMOTE_BT_ENABLE_DELAY_MS = 5000;
     42 
     43     static final String ACTION_HANDOVER_SEND =
     44             "android.nfc.handover.intent.action.HANDOVER_SEND";
     45 
     46     static final String ACTION_HANDOVER_SEND_MULTIPLE =
     47             "android.nfc.handover.intent.action.HANDOVER_SEND_MULTIPLE";
     48 
     49     final Context mContext;
     50     final BluetoothDevice mDevice;
     51 
     52     final ArrayList<Uri> mUris;
     53     final boolean mRemoteActivating;
     54     final Handler mHandler;
     55     final Long mCreateTime;
     56 
     57     int mState;
     58 
     59     public BluetoothOppHandover(Context context, BluetoothDevice device, ArrayList<Uri> uris,
     60             boolean remoteActivating) {
     61         mContext = context;
     62         mDevice = device;
     63         mUris = uris;
     64         mRemoteActivating = remoteActivating;
     65         mCreateTime = SystemClock.elapsedRealtime();
     66 
     67         mHandler = new Handler(context.getMainLooper(), this);
     68         mState = STATE_INIT;
     69     }
     70 
     71     /**
     72      * Main entry point. This method is usually called after construction,
     73      * to begin the BT sequence. Must be called on Main thread.
     74      */
     75     public void start() {
     76         if (mRemoteActivating) {
     77             Long timeElapsed = SystemClock.elapsedRealtime() - mCreateTime;
     78             if (timeElapsed < REMOTE_BT_ENABLE_DELAY_MS) {
     79                 mHandler.sendEmptyMessageDelayed(MSG_START_SEND,
     80                         REMOTE_BT_ENABLE_DELAY_MS - timeElapsed);
     81             } else {
     82                 // Already waited long enough for BT to come up
     83                 // - start send.
     84                 sendIntent();
     85             }
     86         } else {
     87             // Remote BT enabled already, start send immediately
     88             sendIntent();
     89         }
     90     }
     91 
     92     void complete() {
     93         mState = STATE_COMPLETE;
     94     }
     95 
     96     void sendIntent() {
     97         Intent intent = new Intent();
     98         intent.setPackage("com.android.bluetooth");
     99         String mimeType = MimeTypeUtil.getMimeTypeForUri(mContext, mUris.get(0));
    100         intent.setType(mimeType);
    101         intent.putExtra(BluetoothDevice.EXTRA_DEVICE, mDevice);
    102         for (Uri uri : mUris) {
    103             // TODO we need to transfer our permission grant from NFC
    104             // to the Bluetooth process. This works, but we don't have
    105             // a good framework API for revoking permission yet.
    106             try {
    107                 mContext.grantUriPermission("com.android.bluetooth", uri,
    108                         Intent.FLAG_GRANT_READ_URI_PERMISSION);
    109             } catch (SecurityException e) {
    110                 Log.e(TAG, "Failed to transfer permission to Bluetooth process.");
    111             }
    112         }
    113         if (mUris.size() == 1) {
    114             intent.setAction(ACTION_HANDOVER_SEND);
    115             intent.putExtra(Intent.EXTRA_STREAM, mUris.get(0));
    116         } else {
    117             intent.setAction(ACTION_HANDOVER_SEND_MULTIPLE);
    118             intent.putParcelableArrayListExtra(Intent.EXTRA_STREAM, mUris);
    119         }
    120         if (DBG) Log.d(TAG, "Handing off outging transfer to BT");
    121         intent.addFlags(Intent.FLAG_RECEIVER_FOREGROUND);
    122         mContext.sendBroadcast(intent);
    123 
    124         complete();
    125     }
    126 
    127 
    128     @Override
    129     public boolean handleMessage(Message msg) {
    130         if (msg.what == MSG_START_SEND) {
    131             sendIntent();
    132             return true;
    133         }
    134         return false;
    135     }
    136 }
    137