我有一个通过 SPP 与蓝牙设备通信的应用程序,我发现当我尝试使用另一个 Android 设备连接到同一个蓝牙设备时,即使我关闭,另一个 Android 设备也无法连接到蓝牙设备我的应用程序或从蓝牙设备中移除电源。唯一的解决方法是取消配对蓝牙设备。我确信我已经关闭了所有的套接字并向我的蓝牙设备发送了正确的断开命令;我想知道为什么我的第二台 Android 设备无法连接到我的蓝牙设备,除非我取消配对。
这是连接的代码:
公共类 ConnectTask 扩展 AsyncTask {
private final WeakReference<Context> weakContext;
BluetoothDevice mdevice;
BluetoothSocket mSocket;
ProgressDialog pd;
public ConnectTask(Context context) {
weakContext = new WeakReference<Context>(context);
}
@Override
protected void onPreExecute() {
final Context context = weakContext.get();
if (context != null) {
super.onPreExecute();
if (pd != null) {
pd = null;
}
pd = new ProgressDialog(context);
pd.setTitle("Connecting...");
pd.setCancelable(false);
if (!pd.isShowing()) {
pd.show();
}
}
BluetoothConnectionService.btAdapter.cancelDiscovery();
}
@Override
protected Void doInBackground(Void... params) {
try {
try {
Thread.sleep(1000);
mdevice = BluetoothConnectionService.getDevice();
UUID uuid = UUID.fromString("00001101-0000-1000-8000-00805F9B34FB");
mSocket = mdevice.createInsecureRfcommSocketToServiceRecord(uuid);
mSocket.connect();
BluetoothConnectionService.setSocket(mSocket);
BluetoothConnectionService.sendMessage(mSocket, "S");
Thread.sleep(1000);
Log.i("BT", "Connected");
} catch (InterruptedException e) {
throw new IOException();
}
} catch (IOException e) {
e.printStackTrace();
try {
Log.i("BT", "trying fallback...");
mSocket = (BluetoothSocket) mSocket.getClass().getMethod("createInsecureRfcommSocket", new Class[]{int.class}).invoke(mdevice, 2);
mSocket.connect();
BluetoothConnectionService.setSocket(mSocket);
BluetoothConnectionService.sendMessage(mSocket, "S");
Thread.sleep(1000);
Log.i("BT", "Connected");
} catch (Exception e2) {
Log.e("Error", "Couldn't establish Bluetooth connection!");
try {
if (mSocket != null) {
mSocket.close();
} else {
Log.e("Error", "Could not close socket!");
}
} catch (IOException e1) {
Log.e("Error", "Could not close socket!");
}
}
}
return null;
}
@Override
protected void onPostExecute(Void result) {
final Context context = weakContext.get();
if (context != null) {
super.onPostExecute(result);
try {
if (pd != null) {
if (pd.isShowing()) {
if (context instanceof Configuration) {
onCompleteConfiguration((Configuration) context);
} else if (context instanceof CollectingDetail) {
onCompleteCollectingDetail((CollectingDetail) context);
}
pd.dismiss();
}
}
} catch (final IllegalArgumentException are) {
Log.e("Error", "Illegal Argument Exception!");
} finally {
pd = null;
}
}
}
更新:原来这个问题是特定于某些 Android 设备的。我遇到此问题的设备具体是在使用两台 Dragon Touch V10 平板电脑时。其他设备我没有这个问题。蓝牙设备基于 RN4677。