Android Bluetooth List Paired Devices Example

Bluetooth is a way to exchange data with other devices wirelessly. Android provides Bluetooth API to perform several tasks such as:

• scan bluetooth devices
• connect and transfer data from and to other devices
• manage multiple connections etc.

Android Bluetooth Api:

The android.bluetooth package provides a lot of interfaces classes to work with bluetooth such as:

• BluetoothAdapter
• BluetoothDevice
• BluetoothSocket
• BluetoothServerSocket
• BluetoothClass
• BluetoothProfile
• BluetoothProfile.ServiceListener
• BluetoothHeadset
• BluetoothA2dp
• BluetoothHealth
• BluetoothHealthCallback
• BluetoothHealthAppConfiguration

List Paired Devices Example:

MainActivity.java:

public class MainActivity extends Activity {

 TextView textview1;

 private static final int REQUEST_ENABLE_BT = 1;

 BluetoothAdapter btAdapter; 

 @Override

 public void onCreate(Bundle savedInstanceState) {

   super.onCreate(savedInstanceState);

   setContentView(R.layout.activity_main);

   textview1 = (TextView) findViewById(R.id.textView1);

   btAdapter = BluetoothAdapter.getDefaultAdapter();

   CheckBluetoothState();

 }

 @Override

 protected void onActivityResult(int requestCode, int resultCode, Intent data) {

   super.onActivityResult(requestCode, resultCode, data);

   if (requestCode == REQUEST_ENABLE_BT) {

     CheckBluetoothState();

   }

 }

 

 @Override

 protected void onDestroy() {

   super.onDestroy();

 }

 

 private void CheckBluetoothState() {

   // Checks for the Bluetooth support and then makes sure it is turned on

   // If it isn't turned on, request to turn it on

   // List paired devices

   if(btAdapter==null) { 

     textview1.append("\nBluetooth NOT supported. Aborting.");

     return;

   } else {

     if (btAdapter.isEnabled()) {

       textview1.append("\nBluetooth is enabled...");

        

       // Listing paired devices

       textview1.append("\nPaired Devices are:");

       Set<BluetoothDevice> devices = btAdapter.getBondedDevices();

       for (BluetoothDevice device : devices) {

         textview1.append("\n  Device: " + device.getName() + ", " + device);

       }

     } else {

       //Prompt user to turn on Bluetooth

       Intent enableBtIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);

       startActivityForResult(enableBtIntent, REQUEST_ENABLE_BT);

     }

   }

 }

    

@Override

public boolean onCreateOptionsMenu(Menu menu) {

// Inflate the menu; this adds items to the action bar if it is present.

getMenuInflater().inflate(R.menu.activity_main, menu);

return true;

}

}

activity_main. xml:

<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"

    tools:context=".MainActivity" >

    <TextView

        android:id="@+id/textView1"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_alignParentLeft="true"

        android:layout_alignParentTop="true"

        android:layout_marginLeft="18dp"

        android:layout_marginTop="61dp"

        android:text="Showing Paired Devices:" />

</RelativeLayout>

Add Permission In Manifest File:

 <uses-permission android:name="android.permission.BLUETOOTH" />

    <uses-permission android:name="android.permission.BLUETOOTH_ADMIN" />