我正在尝试将raspberry pi 3与蓝牙连接到智能手机，使用Android来控制传感器。我是Android开发的新手
但是，我无法连接蓝牙。我有蓝牙连接的片段，如下所示。当我打开应用程序并打开蓝牙时，我能够看到可用设备的列表，但是当我尝试连接时，它没有连接。我没有收到任何错误。请帮我。感谢
private class ConnectThread extends Thread {
private final BluetoothSocket mmSocket;
private final BluetoothDevice mmDevice;
public ConnectThread(BluetoothDevice device) {
// Use a temporary object that is later assigned to mmSocket,
// because mmSocket is final
BluetoothSocket tmp = null;
mmDevice = device;
Log.i(TAG, "construct");
// Get a BluetoothSocket to connect with the given BluetoothDevice
try {
// MY_UUID is the app's UUID string, also used by the server code
tmp = device.createRfcommSocketToServiceRecord(MY_UUID);
} catch (IOException e) {
Log.i(TAG, "get socket failed");
}
mmSocket = tmp;
}
public void run() {
// Cancel discovery because it will slow down the connection
bluetoothAdapter.cancelDiscovery();
Log.i(TAG, "connect - run");
try {
// Connect the device through the socket. This will block
// until it succeeds or throws an exception
mmSocket.connect();
Log.i(TAG, "connect - succeeded");
} catch (IOException connectException) { Log.i(TAG, "connect failed");
// Unable to connect; close the socket and get out
try {
mmSocket.close();
} catch (IOException closeException) { }
return;
}
// Do work to manage the connection (in a separate thread)
mHandler.obtainMessage(SUCCESS_CONNECT, mmSocket).sendToTarget();
}
/** Will cancel an in-progress connection, and close the socket */
public void cancel() {
try {
mmSocket.close();
} catch (IOException e) { }
}
}
logcat的：
06-11 12:42:42.366 24775-24775/pratik.prajapati.rpicontrol D/Bluetooth_Fragment : Debug ==============================>: onActivityCreated
06-11 12:42:42.368 24775-24775/pratik.prajapati.rpicontrol D/BluetoothAdapter: 592452976: getState() : mService = null. Returning STATE_OFF
06-11 12:42:42.368 24775-24775/pratik.prajapati.rpicontrol D/BluetoothAdapter: 592452976: getState() : mService = null. Returning STATE_OFF
06-11 12:42:44.242 24775-24775/pratik.prajapati.rpicontrol D/BluetoothAdapter: 592452976: getState() : mService = null. Returning STATE_OFF
06-11 12:42:44.242 24775-24775/pratik.prajapati.rpicontrol D/BluetoothAdapter: 592452976: getState() : mService = null. Returning STATE_OFF
06-11 12:42:44.569 24775-24775/pratik.prajapati.rpicontrol W/InputMethodManager: startInputInner : InputBindResult == null
06-11 12:42:46.671 24775-24775/pratik.prajapati.rpicontrol D/Bluetooth_Fragment : Debug ==============================>: BroadcastReceiver
06-11 12:42:46.672 24775-24775/pratik.prajapati.rpicontrol D/Bluetooth_Fragment : Debug ==============================>: ACTION_DISCOVERY_STARTED
06-11 12:42:46.672 24775-24775/pratik.prajapati.rpicontrol I/Timeline: Timeline: Activity_idle id: android.os.BinderProxy@1f4b7828 time:54694433
06-11 12:42:54.474 24775-24775/pratik.prajapati.rpicontrol D/Bluetooth_Fragment : Debug ==============================>: BroadcastReceiver
06-11 12:42:54.476 24775-24775/pratik.prajapati.rpicontrol D/BluetoothDevice: getService : Register callback
06-11 12:42:54.481 24775-24775/pratik.prajapati.rpicontrol D/Bluetooth_Fragment : Debug ==============================>: New Device Found : WASI (UnPaired)
60:36:DD:56:00:44
06-11 12:43:12.396 24775-24775/pratik.prajapati.rpicontrol D/Bluetooth_Fragment : Debug ==============================>: BroadcastReceiver
06-11 12:43:12.400 24775-24775/pratik.prajapati.rpicontrol D/Bluetooth_Fragment : Debug ==============================>: New Device Found : DESKTOP-36AH3D9 (UnPaired)
60:6C:66:8B:B7:57
06-11 12:43:13.228 24775-24775/pratik.prajapati.rpicontrol D/Bluetooth_Fragment : Debug ==============================>: BroadcastReceiver
06-11 12:43:13.229 24775-24775/pratik.prajapati.rpicontrol D/Bluetooth_Fragment : Debug ==============================>: ACTION_DISCOVERY_FINISHED
06-11 12:43:21.046 24775-24775/pratik.prajapati.rpicontrol I/Bluetooth_Fragment : Debug ==============================>: construct
06-11 12:43:21.054 24775-26477/pratik.prajapati.rpicontrol I/Bluetooth_Fragment : Debug ==============================>: connect - run
06-11 12:43:21.054 24775-26477/pratik.prajapati.rpicontrol W/BluetoothAdapter: getBluetoothService() called with no BluetoothManagerCallback
06-11 12:43:33.273 24775-26477/pratik.prajapati.rpicontrol I/Bluetooth_Fragment : Debug ==============================>: connect failed