有关Android Bluetooth - OBEX OPP文件传送

Android developer站点相当详细地介绍了bluetooth API的使用，但它没有提到OBEX。事实上，Adroid早已支持OBEX 的文件传输等功能，比如在share文件时，就可以选择通过蓝牙share，其用到的就是OBEX协议，感兴趣的可以下载android的源程序看其如何实现OBEX OPP协议(访问grepcode站点可以很方便地查看下载源码)。

我根据前人通过查看源程序找到的OBEX文件传输方法写了个程序，在android 2.2上没问题。实现过程大致如下：

1. 使能Bluetooth

 BluetoothAdapter mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();

 if (!mBluetoothAdapter.isEnabled()) {
   Intent enableIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
   startActivityForResult(enableIntent, REQUEST_ENABLE_BT);
 }

2. 获取可用的device列表（copy自BluetoothChat demo）

 

 // Get the local Bluetooth adapter
 mBtAdapter = BluetoothAdapter.getDefaultAdapter();

 // Get a set of currently paired devices
 Set<BluetoothDevice> pairedDevices = mBtAdapter.getBondedDevices();

3. 查找新device

 <pre name="code" class="java">  a. 登记Bluetooth设备发现和查找结束广播receiver
        // Register for broadcasts when a device is discovered
         IntentFilter filter = new IntentFilter(BluetoothDevice.ACTION_FOUND);
         this.registerReceiver(mReceiver, filter);

         // Register for broadcasts when discovery has finished
         filter = new IntentFilter(BluetoothAdapter.ACTION_DISCOVERY_FINISHED);
         this.registerReceiver(mReceiver, filter);

  <pre name="code" class="java"><pre name="code" class="java">   b. Receiver的消息处理代码
    <pre name="code" class="java">    private final BroadcastReceiver mReceiver = new BroadcastReceiver() {
         @Override
         public void onReceive(Context context, Intent intent) {
             String action = intent.getAction();

             // When discovery finds a device
             if (BluetoothDevice.ACTION_FOUND.equals(action)) {
                 // Get the BluetoothDevice object from the Intent
                 BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
                 // If it's already paired, skip it, because it's been listed already
                 if (device.getBondState() != BluetoothDevice.BOND_BONDED) {
                     mNewDevicesArrayAdapter.add(device.getName() + "\n" + device.getAddress());
                 }
             // When discovery is finished, change the Activity title
             } else if (BluetoothAdapter.ACTION_DISCOVERY_FINISHED.equals(action)) {
     ...//此处省略500字
             }
         }
     };
 </pre><br>
 c. 触发新设备的扫描
 <pre></pre>
 <pre></pre>
 <pre name="code" class="java">        if (mBtAdapter.isDiscovering()) {
             mBtAdapter.cancelDiscovery();
         }

         // Request discover from BluetoothAdapter
         mBtAdapter.startDiscovery();
 </pre><br>
 <pre></pre>
 <p>4. 选择paired设备，获取其MAC地址，发起文件传送请求</p>
 <p></p>
 <pre name="code" class="java">                  // Get the BLuetoothDevice object
                     BluetoothDevice device = mBluetoothAdapter.getRemoteDevice(address);
                     // Attempt to connect to the device
                     String filePath = Environment.getExternalStorageDirectory().toString() + "/DCIM/Camera/2011-12-27_15-57-43_500.jpg";
                     ContentValues values = new ContentValues();
                     values.put(BluetoothShare.URI, Uri.fromFile(new File(filePath)).toString());
                     values.put(BluetoothShare.DESTINATION, device.getAddress());
                     values.put(BluetoothShare.DIRECTION, BluetoothShare.DIRECTION_OUTBOUND);
                     Long ts = System.currentTimeMillis();
                     values.put(BluetoothShare.TIMESTAMP, ts);
                     Uri contentUri = this.getActivity().getContentResolver().insert(BluetoothShare.CONTENT_URI, values);
                         Log.d(TAG, "contentUri:"+contentUri);
 </pre>从<a href="http://grepcode.com/file/repository.grepcode.com/java/ext/com.google.android/android-apps/2.2_r1.1/com/android/bluetooth/opp/BluetoothShare.java?av=f">Android 2.2源程序</a>中拿<pre name="code" class="java">BluetoothShare程序</pre><br>
 <strong>注：此方法是基于Android 2.2的，由于不是发布的SDK，故后面版本的android有可能因为其OBEX OPP实现不同，文件发送的代码可能需要相应做改动。</strong>
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