我正在编写一个需要在Android 2.0中运行的程序。我目前正在尝试将我的Android设备连接到嵌入式蓝牙芯片。我已经获得了使用fetchuidsWithSDP（）或getUuids（）的信息，但我读过的页面解释说这些方法隐藏在2.0 SDK中，必须使用反射调用。我不知道这意味着什么，也没有解释。给出了示例代码，但背后的解释很少。我希望有人可以帮助我理解这里的实际情况，因为我对Android开发很新。
String action = "android.bleutooth.device.action.UUID";
IntentFilter filter = new IntentFilter( action );
registerReceiver( mReceiver, filter );
我读到的页面也说，在第一行蓝牙是故意拼写“bleutooth”。如果有人能够解释这一点，我会很感激，除非开发人员输入错字，否则对我来说没有任何意义。
private final BroadcastReceiver mReceiver = new BroadcastReceiver() {
@Override
public void onReceive( Context context, Intent intent ) {
BluetoothDevice deviceExtra = intent.getParcelableExtra("android.bluetooth.device.extra.Device");
Parcelable[] uuidExtra = intent.getParcelableArrayExtra("android.bluetooth.device.extra.UUID");
}
};
我无法掌握如何为嵌入式蓝牙芯片找到正确的UUID。如果有人能提供帮助，我们将非常感激。
编辑：我将添加我的onCreate（）方法的其余部分，以便您可以看到我正在使用的内容。
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// Set up window View
setContentView(R.layout.main);
// Initialize the button to scan for other devices.
btnScanDevice = (Button) findViewById( R.id.scandevice );
// Initialize the TextView which displays the current state of the bluetooth
stateBluetooth = (TextView) findViewById( R.id.bluetoothstate );
startBluetooth();
// Initialize the ListView of the nearby bluetooth devices which are found.
listDevicesFound = (ListView) findViewById( R.id.devicesfound );
btArrayAdapter = new ArrayAdapter<String>( AndroidBluetooth.this,
android.R.layout.simple_list_item_1 );
listDevicesFound.setAdapter( btArrayAdapter );
CheckBlueToothState();
// Add an OnClickListener to the scan button.
btnScanDevice.setOnClickListener( btnScanDeviceOnClickListener );
// Register an ActionFound Receiver to the bluetooth device for ACTION_FOUND
registerReceiver( ActionFoundReceiver, new IntentFilter( BluetoothDevice.ACTION_FOUND ) );
// Add an item click listener to the ListView
listDevicesFound.setOnItemClickListener( new OnItemClickListener()
{
public void onItemClick(AdapterView<?> arg0, View arg1,int arg2, long arg3)
{
// Save the device the user chose.
myBtDevice = btDevicesFound.get( arg2 );
// Open a socket to connect to the device chosen.
try {
btSocket = myBtDevice.createRfcommSocketToServiceRecord( MY_UUID );
} catch ( IOException e ) {
Log.e( "Bluetooth Socket", "Bluetooth not available, or insufficient permissions" );
} catch ( NullPointerException e ) {
Log.e( "Bluetooth Socket", "Null Pointer One" );
}
// Cancel the discovery process to save battery.
myBtAdapter.cancelDiscovery();
// Update the current state of the Bluetooth.
CheckBlueToothState();
// Attempt to connect the socket to the bluetooth device.
try {
btSocket.connect();
// Open I/O streams so the device can send/receive data.
iStream = btSocket.getInputStream();
oStream = btSocket.getOutputStream();
} catch ( IOException e ) {
Log.e( "Bluetooth Socket", "IO Exception" );
} catch ( NullPointerException e ) {
Log.e( "Bluetooth Socket", "Null Pointer Two" );
}
}
});
}
答案 0 :(得分：5)
您可能最好使用同步版本，因此您无需处理设置BroadcastReceiver的所有活动部分。由于您始终在发现之后执行此操作，因此缓存的数据将始终是新鲜的。
这里将UUID数据封装到方法中的功能。此代码位于您链接的博客文章的评论之一：
//In SDK15 (4.0.3) this method is now public as
//Bluetooth.fetchUuisWithSdp() and BluetoothDevice.getUuids()
public ParcelUuid[] servicesFromDevice(BluetoothDevice device) {
try {
Class cl = Class.forName("android.bluetooth.BluetoothDevice");
Class[] par = {};
Method method = cl.getMethod("getUuids", par);
Object[] args = {};
ParcelUuid[] retval = (ParcelUuid[]) method.invoke(device, args);
return retval;
} catch (Exception e) {
e.printStackTrace();
return null;
}
}
然后，您可以在代码中的任何位置调用此方法，向其传递BluetoothDevice并返回该设备服务的UUID数组（通常对于小型嵌入式堆栈，该数组仅为1项）;类似的东西：
// Save the device the user chose.
myBtDevice = btDevicesFound.get( arg2 );
//Query the device's services
ParcelUuid[] uuids = servicesFromDevice(myBtDevice);
// Open a socket to connect to the device chosen.
try {
btSocket = myBtDevice.createRfcommSocketToServiceRecord(uuids[0].getUuid());
} catch ( IOException e ) {
Log.e( "Bluetooth Socket", "Bluetooth not available, or insufficient permissions" );
} catch ( NullPointerException e ) {
Log.e( "Bluetooth Socket", "Null Pointer One" );
}
在上面发布的块中。
作为旁注，以您的方式调用所有这些代码将使您的应用程序稍后感到悲伤。调用connect()并获取流的代码块应该在后台线程上完成，因为该方法将阻塞一段时间，并且在主线程上调用此代码将暂时冻结您的UI。您应该将该代码移动到AsyncTask或Thread，例如SDK中的BluetoothChat示例。
HTH
答案 1 :(得分：-1)
我也面临同样的问题，这就是我为Android 2.3.3解决它的方法。我认为同样的解决方案也适用于Android 2.2。
private final BroadcastReceiver mReceiver = new BroadcastReceiver() {
@SuppressLint("NewApi")
@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);
Toast.makeText(getApplicationContext(),"Device: "+device.getName(),Toast.LENGTH_SHORT).show();
devices.add(device.getName() + "\n" + device.getAddress());
list.add(device);
}
else if(BluetoothDevice.ACTION_UUID.equals(action)){
Toast.makeText(getApplicationContext(),"I am Here",Toast.LENGTH_SHORT).show();
}
else {
if(BluetoothAdapter.ACTION_DISCOVERY_FINISHED.equals(action)) {
Toast.makeText(getApplicationContext(),"Done Scanning..",Toast.LENGTH_SHORT).show();
Iterator<BluetoothDevice> itr = list.iterator();
while(itr.hasNext())
{
BluetoothDevice dev=itr.next();
if(dev.fetchUuidsWithSdp())
{
Parcelable a[]=dev.getUuids();
Toast.makeText(getApplicationContext(),dev.getName()+":"+a[0],Toast.LENGTH_SHORT).show();
}
}
}
}
}
};