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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.handover;
     18 
     19 import android.bluetooth.BluetoothDevice;
     20 import android.content.ContentResolver;
     21 import android.content.Context;
     22 import android.content.Intent;
     23 import android.net.Uri;
     24 import android.os.Handler;
     25 import android.os.Message;
     26 import android.os.SystemClock;
     27 import android.os.UserHandle;
     28 import android.util.Log;
     29 import android.webkit.MimeTypeMap;
     30 import java.util.ArrayList;
     31 import java.util.Arrays;
     32 
     33 public class BluetoothOppHandover implements Handler.Callback {
     34     static final String TAG = "BluetoothOppHandover";
     35     static final boolean DBG = true;
     36 
     37     static final int STATE_INIT = 0;
     38     static final int STATE_TURNING_ON = 1;
     39     static final int STATE_WAITING = 2; // Need to wait for remote side turning on BT
     40     static final int STATE_COMPLETE = 3;
     41 
     42     static final int MSG_START_SEND = 0;
     43 
     44     static final int REMOTE_BT_ENABLE_DELAY_MS = 5000;
     45 
     46     static final String ACTION_HANDOVER_SEND =
     47             "android.btopp.intent.action.HANDOVER_SEND";
     48 
     49     static final String ACTION_HANDOVER_SEND_MULTIPLE =
     50             "android.btopp.intent.action.HANDOVER_SEND_MULTIPLE";
     51 
     52     final Context mContext;
     53     final BluetoothDevice mDevice;
     54 
     55     final Uri[] mUris;
     56     final boolean mRemoteActivating;
     57     final Handler mHandler;
     58     final Long mCreateTime;
     59 
     60     int mState;
     61 
     62     public BluetoothOppHandover(Context context, BluetoothDevice device, Uri[] uris,
     63             boolean remoteActivating) {
     64         mContext = context;
     65         mDevice = device;
     66         mUris = uris;
     67         mRemoteActivating = remoteActivating;
     68         mCreateTime = SystemClock.elapsedRealtime();
     69 
     70         mHandler = new Handler(context.getMainLooper(),this);
     71         mState = STATE_INIT;
     72     }
     73 
     74     public static String getMimeTypeForUri(Context context, Uri uri)  {
     75         if (uri.getScheme() == null) return null;
     76 
     77         if (uri.getScheme().equals(ContentResolver.SCHEME_CONTENT)) {
     78             ContentResolver cr = context.getContentResolver();
     79             return cr.getType(uri);
     80         } else if (uri.getScheme().equals(ContentResolver.SCHEME_FILE)) {
     81             String extension = MimeTypeMap.getFileExtensionFromUrl(uri.getPath()).toLowerCase();
     82             if (extension != null) {
     83                 return MimeTypeMap.getSingleton().getMimeTypeFromExtension(extension);
     84             } else {
     85                 return null;
     86             }
     87         } else {
     88             Log.d(TAG, "Could not determine mime type for Uri " + uri);
     89             return null;
     90         }
     91     }
     92 
     93     /**
     94      * Main entry point. This method is usually called after construction,
     95      * to begin the BT sequence. Must be called on Main thread.
     96      */
     97     public void start() {
     98         if (mRemoteActivating) {
     99             Long timeElapsed = SystemClock.elapsedRealtime() - mCreateTime;
    100             if (timeElapsed < REMOTE_BT_ENABLE_DELAY_MS) {
    101                 mHandler.sendEmptyMessageDelayed(MSG_START_SEND,
    102                         REMOTE_BT_ENABLE_DELAY_MS - timeElapsed);
    103             } else {
    104                 // Already waited long enough for BT to come up
    105                 // - start send.
    106                 sendIntent();
    107             }
    108         } else {
    109             // Remote BT enabled already, start send immediately
    110             sendIntent();
    111         }
    112     }
    113 
    114     void complete() {
    115         mState = STATE_COMPLETE;
    116     }
    117 
    118     void sendIntent() {
    119         Intent intent = new Intent();
    120         intent.setPackage("com.android.bluetooth");
    121         String mimeType = getMimeTypeForUri(mContext, mUris[0]);
    122         intent.setType(mimeType);
    123         intent.putExtra(BluetoothDevice.EXTRA_DEVICE, mDevice);
    124         if (mUris.length == 1) {
    125             intent.setAction(ACTION_HANDOVER_SEND);
    126             intent.putExtra(Intent.EXTRA_STREAM, mUris[0]);
    127         } else {
    128             ArrayList<Uri> uris = new ArrayList<Uri>(Arrays.asList(mUris));
    129             intent.setAction(ACTION_HANDOVER_SEND_MULTIPLE);
    130             intent.putParcelableArrayListExtra(Intent.EXTRA_STREAM, uris);
    131         }
    132         if (DBG) Log.d(TAG, "Handing off outging transfer to BT");
    133         mContext.sendBroadcast(intent);
    134 
    135         complete();
    136     }
    137 
    138 
    139     @Override
    140     public boolean handleMessage(Message msg) {
    141         if (msg.what == MSG_START_SEND) {
    142             sendIntent();
    143             return true;
    144         }
    145         return false;
    146     }
    147 }
    148