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Android Bluetooth List Paired Devices Example

The getBoundedDevices() method of BluetoothAdapter class provides a set containing list of all paired or bounded bluetooth devices.

In this example, we are checking if the bluetooth is turned off, if yes then turn it on and list all the paired devices.

activity_main.xml

Drag one textview from the pallete, now the activity_main.xml file will like this:

File: activity_main.xml

<RelativeLayout xmlns:androclass="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>

Provide Permission

You need to provide following permissions in AndroidManifest.xml file.

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

The full code of AndroidManifest.xml file is given below.

File: AndroidManifest.xml

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

    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="17" />

    <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="@style/AppTheme" >
        <activity
            android:name="com.example.bluetoothshowpaired.MainActivity"
            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>

Activity class

Let's write the code to provide the list of paired (bounded) bluetooth devices.

File: MainActivity.java

package com.example.bluetoothshowpaired;

import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import java.util.Set;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.content.Intent;
import android.widget.TextView;
 
public class MainActivity extends Activity {
	  TextView textview1;
	  private static final int REQUEST_ENABLE_BT = 1;
	  BluetoothAdapter btAdapter; 
	 
	  /** Called when the activity is first created. */
	  @Override
	  public void onCreate(Bundle savedInstanceState) {
	    super.onCreate(savedInstanceState);
	    setContentView(R.layout.activity_main);
	 
	    textview1 = (TextView) findViewById(R.id.textView1);
	     
	    // Getting the Bluetooth adapter
	    btAdapter = BluetoothAdapter.getDefaultAdapter();
	    textview1.append("\nAdapter: " + btAdapter);
	     
	    CheckBluetoothState();
	  }
	     
	  /* It is called when an activity completes.*/
	  @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;
	}

}

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