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Android : Bluetooth List Paired Devices

Tutorial by:Kathy      Date: 2018-01-25 00:12:26

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The Bluetooth Adapter Class GetBoundDevices () method provides a set containing all the coupled or bound Bluetooth devices.

In this example, we are checking whether Bluetooth is switched or not, if so, then turn it on and list all 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 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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