How to find available bluetooth devices in range?

Question

I am trying to find all the available bluetooth devices in a range. But I am getting only one device I am using it in thread in run method. I already checked many links for this problem on it but could not resolve this issue. Here is my code

  public void run() {


if(service != null) {
    IntentFilter filter = new IntentFilter(BluetoothDevice.ACTION_FOUND);
    filter.addAction(BluetoothAdapter.ACTION_DISCOVERY_FINISHED);
    service.registerReceiver(this.bReceiver, filter);
        bluetooth.startDiscovery();
}

}
class BluetoothReceiver extends BroadcastReceiver {
public void onReceive(Context context, Intent intent) {

    Set<BluetoothDevice> pairedDevices = bluetooth.getBondedDevices();

    String action = intent.getAction();
    if (pairedDevices.size() > 0) {
            for (BluetoothDevice device : pairedDevices) {
                int rssi = intent.getShortExtra(BluetoothDevice.EXTRA_RSSI,Short.MIN_VALUE);
       Log.d(TAG, device.getName());
    }
    }

    if(BluetoothDevice.ACTION_FOUND.equals(action)) {
    BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
    String uuid = intent.getStringExtra(BluetoothDevice.EXTRA_UUID);
    int rssi = intent.getShortExtra(BluetoothDevice.EXTRA_RSSI,Short.MIN_VALUE);
    Log.d(TAG, device.getName());
    }
    }

}

In Addition I want rssi value of each found device, but please ignore the syntax

Answer 1

This is how I search for Bluetooth devices in an Activity and show their name and mac-address in a ListView. Apart from displaying the devices in a ListView, you can do practically anything with the discovered BluetoothDevice object.

FindBluetoothActivity.java

public class FindBluetoothActivity extends Activity {

    private BluetoothAdapter mBtAdapter;
    private ListView mLvDevices;
    private ArrayList<String> mDeviceList = new ArrayList<String>();

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_find_bluetooth);

        mLvDevices = (ListView) findViewById(R.id.lvDevices);

        IntentFilter filter = new IntentFilter(BluetoothDevice.ACTION_FOUND);        
        registerReceiver(mBtReceiver, filter); 

        // Getting the Bluetooth adapter
        mBtAdapter = BluetoothAdapter.getDefaultAdapter();
        if(mBtAdapter != null) {
            mBtAdapter.startDiscovery();
            Toast.makeText(this, "Starting discovery...", Toast.LENGTH_SHORT).show();
        }
        else {
            Toast.makeText(this, "Bluetooth disabled or not available.", Toast.LENGTH_SHORT).show();
        }
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        if (mBtAdapter != null) {
            mBtAdapter.cancelDiscovery();
        }
        unregisterReceiver(mBtReceiver);
    }

    private final BroadcastReceiver mBtReceiver = new BroadcastReceiver() {

        @Override
        public void onReceive(Context context, Intent intent) {
            String action = intent.getAction();
            if (BluetoothDevice.ACTION_FOUND.equals(action)) {
                BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
                mDeviceList.add(device.getAddress() + ", " + device.getName()); // get mac address

                ArrayAdapter<String> adapter = new ArrayAdapter<String>(getApplicationContext(), android.R.layout.simple_list_item_1, mDeviceList);
                mLvDevices.setAdapter(adapter);
            } 
        }
    };
}

Layout .xml file:

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".FindBluetoothActivity" >

    <ListView
        android:id="@+id/lvDevices"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_alignParentLeft="true"
        android:layout_alignParentTop="true" >
    </ListView>

</RelativeLayout>

Android Manifest.xml file:

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.bluetoothexample"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="11"
        android:targetSdkVersion="18" />
    <uses-permission android:name="android.permission.BLUETOOTH"/>
    <uses-permission android:name="android.permission.BLUETOOTH_ADMIN"/>

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@android:style/Theme.Holo.Light" >
        <activity
            android:name="com.example.bluetoothexample.FindBluetoothActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

Additional information:

• Make sure Bluetooth is enabled on your device
• Add permissions android.permission.BLUETOOTH and android.permission.BLUETOOTH_ADMIN to your Manifest.xml file
• Make sure to unregister your broadcast-receiver when destroying the Activity
• Keep in mind that the Bluetooth devices in range need to be discoverable to be found by your application. Enabling bluetooth on them alone may not be enough. It is very often the case that some kind of "discoverable" mode needs to be enabled by the user before the device can be discovered by other devices.
• Be aware that the range in which devices are discoverable via Bluetooth is usually around 10m indoors and around 50m outdoors