List paired BlueTooth devices, and read its information

This example check BlueTooth support of the device, then check if it is enabled, and list paired devices in ListView. When user click on any device, display it details.


MainActivity.java

package com.example.androidbluetooth;

import java.util.ArrayList;
import java.util.Set;

import android.support.v7.app.ActionBarActivity;
import android.app.Activity;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.Toast;

public class MainActivity extends ActionBarActivity {
 
 private static final int REQUEST_ENABLE_BT = 1;
 
 BluetoothAdapter bluetoothAdapter;
 
 ArrayList pairedDeviceArrayList;
 
 ListView listViewPairedDevice;
 ArrayAdapter pairedDeviceAdapter;

 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);
  listViewPairedDevice = (ListView)findViewById(R.id.pairedlist);
  
  if (!getPackageManager().hasSystemFeature(PackageManager.FEATURE_BLUETOOTH)){
   Toast.makeText(this, 
    "FEATURE_BLUETOOTH NOT support", 
    Toast.LENGTH_LONG).show();
            finish();
            return;
  }
  
  bluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
  if (bluetoothAdapter == null) {
   Toast.makeText(this, 
    "Bluetooth is not supported on this hardware platform", 
    Toast.LENGTH_LONG).show();
            finish();
            return;
  }
 }

 @Override
 protected void onStart() {
  super.onStart();
  
  //Turn ON BlueTooth if it is OFF
  if (!bluetoothAdapter.isEnabled()) {
            Intent enableIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
            startActivityForResult(enableIntent, REQUEST_ENABLE_BT);
        }
  
  setup();
 }
 
 private void setup() {
  Set pairedDevices = bluetoothAdapter.getBondedDevices();
  if (pairedDevices.size() > 0) {
   pairedDeviceArrayList = new ArrayList();
   
   for (BluetoothDevice device : pairedDevices) {
    pairedDeviceArrayList.add(device);
            }
   
   pairedDeviceAdapter = new ArrayAdapter(this,
                 android.R.layout.simple_list_item_1, pairedDeviceArrayList);
   listViewPairedDevice.setAdapter(pairedDeviceAdapter);
   
   listViewPairedDevice.setOnItemClickListener(new OnItemClickListener(){

    @Override
    public void onItemClick(AdapterView parent, View view,
      int position, long id) {
     BluetoothDevice device = 
       (BluetoothDevice)parent.getItemAtPosition(position);
      Toast.makeText(MainActivity.this, 
       "Name: " + device.getName() + "\n"
       + "Address: " + device.getAddress() + "\n"
       + "BondState: " + device.getBondState() + "\n"
       + "BluetoothClass: " + device.getBluetoothClass() + "\n"
       + "Class: " + device.getClass(),
       Toast.LENGTH_LONG).show();
    }});
  }
 }

 @Override
 protected void onActivityResult(int requestCode, int resultCode, Intent data) {
  
  if(requestCode==REQUEST_ENABLE_BT){
   if(resultCode == Activity.RESULT_OK){
    setup();
   }else{
    Toast.makeText(this, 
     "BlueTooth NOT enabled", 
     Toast.LENGTH_SHORT).show();
             finish();
   }
  } 
 }
}

/res/layout/activity_main.xml

    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"
    android:orientation="vertical"
    tools:context="com.example.androidbluetooth.MainActivity" >

            android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center_horizontal"
        android:autoLink="web"
        android:text="http://picturedmagazine.blogspot.com/"
        android:textStyle="bold" />
    
            android:id="@+id/pairedlist"
        android:layout_width="match_parent"
        android:layout_height="match_parent"/>

"android.permission.BLUETOOTH" is needed in AndroidManifest.xml

    package="com.example.androidbluetooth"
    android:versionCode="1"
    android:versionName="1.0" >

            android:minSdkVersion="8"
        android:targetSdkVersion="21" />
    

            android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
                    android:name=".MainActivity"
            android:label="@string/app_name" >
            
                

                
            
        
    

Download the files.

Next:
- Make BlueTooth connection between Android devices
- Bluetooth communication between Android devices