Connecting to the Paired OBD2 Device

android_connect_paired_obd2.java

import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.bluetooth.BluetoothSocket;

BluetoothSocket mmSocket;
UUID MY_UUID = UUID.fromString("2cf6e0ab-5417-4595-8564-487134f99ccd");

try {
    // Get a BluetoothSocket to connect with the given BluetoothDevice.
    // MY_UUID is the app's UUID string, also used in the server code.
    mmSocket = obd2Device.createRfcommSocketToServiceRecord(MY_UUID);
} catch (IOException e) {
    Log.e(TAG, "Socket's create() method failed", e);
}

try {
    // Connect to the remote device through the socket. This call blocks
    // until it succeeds or throws an exception.
    mmSocket.connect();
} catch (IOException connectException) {
    // if the connection cannot be made with UUID,
    // then connect directly by using a hidden method using reflections
    try {
        Class<?> clazz = mmSocket.getRemoteDevice().getClass();
        Class<?>[] paramTypes = new Class<?>[]{Integer.TYPE};
        Method m = clazz.getMethod("createRfcommSocket", paramTypes);
        Object[] params = new Object[]{Integer.valueOf(1)};
        mmSocket = (BluetoothSocket) m.invoke(mmSocket.getRemoteDevice(), params);

        Thread.sleep(500);
        mmSocket.connect();
    } catch (Exception e) {
        Log.e(TAG, "Could not connect using reflections", e);
    }
}