Finding Android Bluetooth Paired Devices

Question

I\'m trying to create an image button that, when pressed, presents the users a list of Paired Bluetooth devices to connect to.

However, I get \"Set cannot be resolve

Answer 1

For 1) Well if you haven't done so , add

> import java.util.Set;

in your import statements . This will resolve "Set" error.

For 2) Declare and initialize

mArrayAdapter

For example in your Activity do :

private ArrayAdapter mArrayAdapter;

and then on onCreate:

 mArrayAdapter= new ArrayAdapter(this, );

which should then be added to a ListView

// Find and set up the ListView for newly discovered devices

   ListView newDevicesListView = (ListView)
 findViewById(R.id.);
         newDevicesListView.setAdapter(mArrayAdapter);

 newDevicesListView.setOnItemClickListener(mDeviceClickListener);

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Refer to Bluetooth Chat example from Android examples. It should help you get going with the Bluetooth api's

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Update on comment :

If you look closely on BluetoothChat.java file in BT example, you'll see this

public void onActivityResult(int requestCode, int resultCode, Intent data) {
        if(D) Log.d(TAG, "onActivityResult " + resultCode);
        switch (requestCode) {
        case REQUEST_CONNECT_DEVICE:
            // When DeviceListActivity returns with a device to connect
            if (resultCode == Activity.RESULT_OK) {
                // Get the device MAC address
                String address = data.getExtras()
                                     .getString(DeviceListActivity.EXTRA_DEVICE_ADDRESS);
                // Get the BLuetoothDevice object
                BluetoothDevice device = mBluetoothAdapter.getRemoteDevice(address);
                // Attempt to connect to the device
                mChatService.connect(device);
            }
            break;
        case REQUEST_ENABLE_BT:
            // When the request to enable Bluetooth returns
            if (resultCode == Activity.RESULT_OK) {
                // Bluetooth is now enabled, so set up a chat session
                setupChat();
            } else {
                // User did not enable Bluetooth or an error occured
                Log.d(TAG, "BT not enabled");
                Toast.makeText(this, R.string.bt_not_enabled_leaving, Toast.LENGTH_SHORT).show();
                finish();
            }
        }
    }

Watch this line :

 // Attempt to connect to the device
 mChatService.connect(device);

This function connects to bluetooth device. First time it'll ask you to pair it automatically. Once paired, next time it'll auto connect to the bluetooth device.