How to unpair bluetooth device using android 2.1 sdk

10
votes

In Android 2.1, to unpair a Bluetooth device you can go to Bluetooth settings, long-click on a device and select Unpair to unpair that device. I want to be able to do this from my application. I can retrieve a list of paired/bonded devices using BluetoothAdapter.getBondedDevices(), but I can't find how to unpair. I've explored the BluetoothChat sample, and I've searched the sdk but still can't find an API that allows this.

How can I unpair a Bluetooth device?

4
androidbluetooth

4 Answers

11
votes

Here's how you unpair/remove a bonded device call this method where macAddress is the string of the mac address of the device..i.e. "00:02:00:A3:03:05"

IBluetooth ib =getIBluetooth();
ib.removeBond(macAddress);

To get the IBluetooth Object you need to go through a couple of steps

  1. create a package in your project called android.bluetooth
  2. create two files, IBluetooth.aidl and IBluetoothCallback.aidl

  3. create method in your files called getBluetooth()

    private IBluetooth getIBluetooth() {
IBluetooth ibt = null;

try {

    Class c2 = Class.forName("android.os.ServiceManager");

    Method m2 = c2.getDeclaredMethod("getService",String.class);
    IBinder b = (IBinder) m2.invoke(null, "bluetooth");

    Class c3 = Class.forName("android.bluetooth.IBluetooth");

    Class[] s2 = c3.getDeclaredClasses();

    Class c = s2[0];
    Method m = c.getDeclaredMethod("asInterface",IBinder.class);
    m.setAccessible(true);
    ibt = (IBluetooth) m.invoke(null, b);


} catch (Exception e) {
    Log.e("flowlab", "Erroraco!!! " + e.getMessage());
}

return ibt;
}

    /************ IBluetooth.aidl ************/

    package android.bluetooth;

import android.bluetooth.IBluetoothCallback;
import android.os.ParcelUuid;

/**
  * System private API for talking with the Bluetooth service.
  *
  * {@hide}
  */
 interface IBluetooth
 {
   boolean isEnabled();
   int getBluetoothState();
   boolean enable();
   boolean disable(boolean persistSetting);

   String getAddress();
   String getName();
   boolean setName(in String name);

   int getScanMode();
   boolean setScanMode(int mode, int duration);

   int getDiscoverableTimeout();
   boolean setDiscoverableTimeout(int timeout);

   boolean startDiscovery();
   boolean cancelDiscovery();
   boolean isDiscovering();

   boolean createBond(in String address);
   boolean cancelBondProcess(in String address);
   boolean removeBond(in String address);
   String[] listBonds();
   int getBondState(in String address);

   String getRemoteName(in String address);
   int getRemoteClass(in String address);
   ParcelUuid[] getRemoteUuids(in String address);
   boolean fetchRemoteUuids(in String address, in ParcelUuid uuid, in IBluetoothCallback callback);
   int getRemoteServiceChannel(in String address, in ParcelUuid uuid);

   boolean setPin(in String address, in byte[] pin);
   boolean setPasskey(in String address, int passkey);
   boolean setPairingConfirmation(in String address, boolean confirm);
   boolean cancelPairingUserInput(in String address);

   boolean setTrust(in String address, in boolean value);
   boolean getTrustState(in String address);

   int addRfcommServiceRecord(in String serviceName, in ParcelUuid uuid, int channel, IBinder b);
   void removeServiceRecord(int handle);
}

/************ IBluetoothCallback.aidl ************/

    package android.bluetooth;

    /**
     * System private API for Bluetooth service callbacks.
     *
     * {@hide}
     */
    interface IBluetoothCallback
    {
        void onRfcommChannelFound(int channel);
    }
3
votes

Another way:

public void clear(View v) {
    Set<BluetoothDevice> bondedDevices = adapter.getBondedDevices();
    try {
        Class<?> btDeviceInstance =  Class.forName(BluetoothDevice.class.getCanonicalName());
        Method removeBondMethod = btDeviceInstance.getMethod("removeBond");
        String currentMac = getCurrentMAC();
        boolean cleared = false;
                for (BluetoothDevice bluetoothDevice : bondedDevices) {
            String mac = bluetoothDevice.getAddress();
            if(mac.equals(currentMac)) {
                removeBondMethod.invoke(bluetoothDevice);
                Log.i(TAG,"Cleared Pairing");
                cleared = true;
                break;
            }
        }

                if(!cleared) {
            Log.i(TAG,"Not Paired");
                }
    } catch (Throwable th) {
        Log.e(TAG, "Error pairing", th);
    }
}
1
votes

you can send the user to bluetooth setting, by this you can unpair devices which are paired Intent intentOpenBluetoothSettings = new Intent(); intentOpenBluetoothSettings.setAction(android.provider.Settings.ACTION_BLUETOOTH_SETTINGS); startActivity(intentOpenBluetoothSettings);`

0
votes

It is possible to unpair a device manually throug droid java.

You can invoke a hidden method to remove the bond.