1. Project Name e Application Name: à sua escolha;
2. Package Name: comunicacao.bluetooth;
3. Create Activity: AppBT1;
4. Após criado o projeto, crie outra Activity com o nome DeviceListActivity.
5. Crie um layout (além do main.xml), com o nome paired_devices.xml;
6. Copie os códigos abaixo para as activities e layouts criados. Copie também o Arquivo Manifest que está abaixo.

AppBT1.java

[sourcecode language=”java”]
package comunicacao.bluetooth;

import android.app.Activity;
import android.bluetooth.BluetoothAdapter;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;

public class AppBT1 extends Activity {
private static final int REQUEST_ENABLE_BT = 1;
private static final int REQUEST_PAIRED_DEVICE = 2;
/** Called when the activity is first created. */

Button btnListPairedDevices;
TextView stateBluetooth;
BluetoothAdapter bluetoothAdapter;

@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
btnListPairedDevices = (Button)findViewById(R.id.listpaireddevices);
stateBluetooth = (TextView)findViewById(R.id.bluetoothstate);
bluetoothAdapter = BluetoothAdapter.getDefaultAdapter();

CheckBluetoothState();
btnListPairedDevices.setOnClickListener(btnListPairedDevicesOnClickListener);
}

private void CheckBluetoothState(){

if (bluetoothAdapter == null){
stateBluetooth.setText("Bluetooth NOT support");
}

else {

if (bluetoothAdapter.isEnabled()){
if(bluetoothAdapter.isDiscovering()){
stateBluetooth.setText("Bluetooth is currently in device discovery process.");
}

else {
stateBluetooth.setText("Bluetooth is Enabled.");
btnListPairedDevices.setEnabled(true);
}
}

else {
stateBluetooth.setText("Bluetooth is NOT Enabled!");
Intent enableBtIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
startActivityForResult(enableBtIntent, REQUEST_ENABLE_BT);
}
}

}

private Button.OnClickListener btnListPairedDevicesOnClickListener
= new Button.OnClickListener(){
@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
Intent intent = new Intent();
intent.setClass(AppBT1.this, DeviceListActivity.class);
startActivityForResult(intent, REQUEST_PAIRED_DEVICE);
}};

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
// TODO Auto-generated method stub
if(requestCode == REQUEST_ENABLE_BT){
CheckBluetoothState();
}

if (requestCode == REQUEST_PAIRED_DEVICE){
if(resultCode == RESULT_OK){

}
}
}
}
[/sourcecode]
DeviceListActivity.java

[sourcecode language=”java”]
package comunicacao.bluetooth;

import java.util.Set;

import android.app.ListActivity;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.ListView;

public class DeviceListActivity extends ListActivity {

@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);

ArrayAdapter<String> btArrayAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1);

BluetoothAdapter bluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
Set<BluetoothDevice> pairedDevices = bluetoothAdapter.getBondedDevices();

if (pairedDevices.size() > 0) {
for (BluetoothDevice device : pairedDevices) {
String deviceBTName = device.getName();
String deviceBTAddress = device.getAddress();
btArrayAdapter.add(deviceBTName + "\n" + deviceBTAddress);
}
}
setListAdapter(btArrayAdapter);
}

@Override
protected void onListItemClick(ListView l, View v, int position, long id) {
// TODO Auto-generated method stub
super.onListItemClick(l, v, position, id);

Intent intent = new Intent();
setResult(RESULT_OK, intent);
finish();
}
}
[/sourcecode]

Os layouts XML:
main.xml

[sourcecode language=”xml”]
<!–?xml version=<i–>"1.0" encoding=<i>"utf-8"</i>?>
"http://schemas.android.com/apk/res/android"
android:orientation=<i>"vertical"</i>
android:layout_width=<i>"fill_parent"</i>
android:layout_height=<i>"fill_parent"</i>
>

<TextView
android:id=<i>"@+id/textView1"</i>
android:layout_width=<i>"wrap_content"</i>
android:layout_height=<i>"wrap_content"</i>
android:text=<i>"Estado do Bluetooth"</i>
android:textAppearance=<i>"?android:attr/textAppearanceMedium"</i> />

<TextView
android:id=<i>"@+id/bluetoothstate"</i>
android:layout_width=<i>"fill_parent"</i>
android:layout_height=<i>"wrap_content"</i>
/>

<Button
android:id=<i>"@+id/listpaireddevices"</i>
android:layout_width=<i>"fill_parent"</i>
android:layout_height=<i>"wrap_content"</i>
android:text=<i>"List Paired Devices"</i>
android:enabled=<i>"false"</i>
/>

<TextView
android:id=<i>"@+id/bluetoothstate"</i>
android:layout_width=<i>"fill_parent"</i>
android:layout_height=<i>"wrap_content"</i>
/>

[/sourcecode]

paired_devices.xml

[sourcecode language=”xml”]
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >

<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content" >

</LinearLayout>

</LinearLayout>

[/sourcecode]

E o Arquivo Manifest:

AndroidManifest.xml

[sourcecode language=”xml”]
<?xml version="1.0" encoding="UTF-8"?>
<manifest android:versionCode="1" android:versionName="1.0"
package="comunicacao.bluetooth" xmlns:android="http://schemas.android.com/apk/res/android">
<uses-sdk android:minSdkVersion="8"/>
<uses-permission android:name="android.permission.BLUETOOTH"/>
<uses-permission android:name="android.permission.BLUETOOTH_ADMIN" />
<application android:label="@string/app_name">
<activity android:label="@string/app_name" android:name=".AppBT1">
<intent-filter>
<action android:name="android.intent.action.MAIN"/>
<category android:name="android.intent.category.LAUNCHER"/>
</intent-filter>
</activity>
<activity
android:label="AppBT1: Lista de Dispositivos Pareados" android:name=".DeviceListActivity"/>
</application>
</manifest>

[/sourcecode]

Analisando o código: Permissões Bluetooth
Para usar os recursos Bluetooth em seu aplicativo, você precisa declarar pelo menos uma das duas permissões Bluetooth:
BLUETOOTH e BLUETOOTH_ADMIN.