Android蓝牙有时连接有时不连接

我执行以下操作以连接到已配对的设备：

        if (connectCreateRfcommSocketToServiceRecordInvoke()) {
            Log.d(TAG_BT, "Connection created 1");
            connected = true;
        } else if (connectCreateRfcommSocket()) {
            Log.d(TAG_BT, "Connection created 2");
            connected = true;
        } else if (connectSecureRfCom(UUID_DEFAULT)) {
            Log.d(TAG_BT, "Connection created 3");
            connected = true;
        } else if (connectInsecureRfCom(UUID_DEFAULT)) {
            Log.d(TAG_BT, "Connection created 4");
            connected = true;
        }else if (tryConnectDifferentUuid()) {
            Log.d(TAG_BT, "Connection created 5");
            connected = true;
        }

以下是被调用函数的定义：

 private boolean tryConnectDifferentUuid() {

    ParcelUuid[] supportedUuids = mDevice.getUuids();

    if (supportedUuids != null){
        for (ParcelUuid Uuid : supportedUuids) {
            if (connectSecureRfCom(Uuid.toString())) {
                return true;
            } else if (connectInsecureRfCom(Uuid.toString())) {
                return true;
            }
        }
    }
    return false;
}


private boolean connectSecureRfCom(String UuidString) {
    try {
        Log.d(TAG_BT, "connectSecureRfCom ");
        mmSocket = mDevice.createRfcommSocketToServiceRecord(UUID.fromString(UuidString));
        mmSocket.connect();
        Log.d(TAG_BT, "Connected");
        return true;
    } catch (Exception e) {
        Log.e(TAG_BT, "Couldn't establish Bluetooth connection!", e);
        return false;
    }
}

private boolean connectInsecureRfCom(String UuidString) {
    try {
        Log.d(TAG_BT, "connectInsecureRfCom ");
        mmSocket = mDevice.createInsecureRfcommSocketToServiceRecord(UUID.fromString(UuidString));
        mmSocket.connect();
        Log.d(TAG_BT, "Connected");
        return true;
    } catch (Exception e) {
        Log.e(TAG_BT, "Couldn't establish Bluetooth connection!", e);
        return false;
    }
}

private boolean connectCreateRfcommSocket() {
    try {
        Log.d(TAG_BT, "connectSecureRfComInvoke ");


        mmSocket =(BluetoothSocket) mDevice.getClass().getMethod("createRfcommSocket", new Class[] {int.class}).invoke(mDevice,1);
        mmSocket.connect();

        Log.d(TAG_BT, "Connected");

        return true;

    } catch (Throwable e) {
        Log.e(TAG_BT, "Couldn't establish Bluetooth connection!", e);
        return false;
    }
}

private boolean connectCreateRfcommSocketToServiceRecordInvoke() {
    try {
        Log.d(TAG_BT, "createRfcommSocketToServiceRecord ");

        mmSocket =(BluetoothSocket) mDevice.getClass().getMethod("createRfcommSocketToServiceRecord", new Class[] {int.class}).invoke(mDevice,1);
        mmSocket.connect();

        Log.d(TAG_BT, "Connected");

        return true;

    } catch (Throwable e) {
        Log.e(TAG_BT, "Couldn't establish Bluetooth connection!", e);
        return false;
    }
}

问题是它有时会连续工作很多次，无论我是打开/关闭应用程序还是断开/连接蓝牙，有时在以下输出情况下都无法工作：

java.io.IOException: read failed, socket might closed or timeout, read ret: -1

---

嗯，如果没有读写操作，套接字会在一段时间后关闭或超时。您应该在具有无限循环的不同线程中使用套接字

public class Client extends(Thread or AsyncTask or Runnable ){
    public void startConnection(){socket.connect(); isConnected = socket.isConnected();}

    private void listenSocket(){
    while(isConnected){ listening process }}

    public void stopConnection(){thread.cancel(); isConnected = false;}

}