java Bluetooth无法连接到OBD2
我正在使用github上的一个应用程序来测试和查看蓝牙聊天如何与我的ELM327配合使用,但当我配对并尝试与它连接时,连接失败。在那之后,我试着拿我的旧手机,并设置与它的连接,它的工作。我甚至可以毫无问题地发送数据。我认为它可能是蓝牙低能量的东西(我对Java和编码是新手,所以这只是一个赌注),但我真的不知道怎么弄清楚,因为logcat没有给我一个错误,应用程序只是说它无法连接设备
这就是im用来测试和了解它的应用程序的来源: https://github.com/DevExchanges/BluetoothChatAppAndroid
// runs while listening for incoming connections
private class AcceptThread extends Thread {
private final BluetoothServerSocket serverSocket;
public AcceptThread() {
BluetoothServerSocket tmp = null;
try {
tmp = bluetoothAdapter.listenUsingInsecureRfcommWithServiceRecord(APP_NAME, MY_UUID);
} catch (IOException ex) {
ex.printStackTrace();
}
serverSocket = tmp;
}
public void run() {
setName("AcceptThread");
BluetoothSocket socket;
while (state != STATE_CONNECTED) {
try {
socket = serverSocket.accept();
} catch (IOException e) {
break;
}
// If a connection was accepted
if (socket != null) {
synchronized (ChatController.this) {
switch (state) {
case STATE_LISTEN:
case STATE_CONNECTING:
// start the connected thread.
connected(socket, socket.getRemoteDevice());
break;
case STATE_NONE:
case STATE_CONNECTED:
// Either not ready or already connected. Terminate
// new socket.
try {
socket.close();
} catch (IOException e) {
}
break;
}
}
}
}
}
public void cancel() {
try {
serverSocket.close();
} catch (IOException e) {
}
}
}
// runs while attempting to make an outgoing connection
private class ConnectThread extends Thread {
private final BluetoothSocket socket;
private final BluetoothDevice device;
public ConnectThread(BluetoothDevice device) {
this.device = device;
BluetoothSocket tmp = null;
try {
tmp = device.createInsecureRfcommSocketToServiceRecord(MY_UUID);
} catch (IOException e) {
e.printStackTrace();
}
socket = tmp;
}
public void run() {
setName("ConnectThread");
// Always cancel discovery because it will slow down a connection
bluetoothAdapter.cancelDiscovery();
// Make a connection to the BluetoothSocket
try {
socket.connect();
} catch (IOException e) {
try {
socket.close();
} catch (IOException e2) {
}
connectionFailed();
return;
}
// Reset the ConnectThread because we're done
synchronized (ChatController.this) {
connectThread = null;
}
// Start the connected thread
connected(socket, device);
}
public void cancel() {
try {
socket.close();
} catch (IOException e) {
}
}
}
# 1 楼答案
从安卓6到更高版本,你必须在手机上启用位置,才能让BLE工作。仅授予应用程序位置权限是不够的。 你可以阅读更多关于它的内容