Bluetooth program in Android

Activity_blue.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"
    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="com.example.bluetooth.BlueActivity" >

    <TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="BlueTooth Example" />

    <Button
        android:id="@+id/button1"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/textView1"
        android:layout_below="@+id/textView1"
        android:layout_marginTop="15dp"
        android:text="Scan" />

    <TextView
        android:id="@+id/textView2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/button1"
        android:layout_below="@+id/button1"
        android:layout_marginLeft="88dp"
        android:layout_marginTop="56dp"
         />

</RelativeLayout>

BlueActivity.java

package com.example.bluetooth;

import android.app.Activity;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.TextView;

public class BlueActivity extends Activity {

BluetoothAdapter ba;
BroadcastReceiver br;
IntentFilter ifs;
TextView tv;
BluetoothDevice bd;
String msg;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_blue);

tv=(TextView) findViewById(R.id.textView2);
ba=BluetoothAdapter.getDefaultAdapter();
if(ba==null){
tv.setText("Bluetooth is not supported by this device");
}

br=new BroadcastReceiver(){

@Override
public void onReceive(Context context, Intent intent) {
// TODO Auto-generated method stub

String action=intent.getAction();
if(action.equals(BluetoothAdapter.ACTION_DISCOVERY_STARTED)){
tv.setText("Discovery was Started");
}

else if(action.equals(BluetoothAdapter.ACTION_DISCOVERY_FINISHED)){
tv.setText("Discovery hasfinished");
}
else if(action.equals(BluetoothDevice.ACTION_FOUND)){
msg=tv.getText().toString();
tv.setText("Bluetooth found");
bd=intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);

msg+="\n"+bd.getName()+"...."+bd.getAddress();

tv.setText(msg);
}
}

};

ifs=new IntentFilter();
ifs.addAction(ba.ACTION_DISCOVERY_STARTED);
ifs.addAction(ba.ACTION_DISCOVERY_FINISHED);
ifs.addAction(bd.ACTION_FOUND);
registerReceiver(br, ifs);
}

public void scanButton(View v){
Intent i=new Intent();
i.setAction(ba.ACTION_REQUEST_DISCOVERABLE);
startActivity(i);
ba.startDiscovery();
}

protected void onDestroy(){
super.onDestroy();
unregisterReceiver(br);
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.blue, menu);
return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}

AndroidManifest.XML

<?xml version="1.0" encoding="utf-8"?>

<manifest xmlns:android="http://schemas.android.com/apk/res/android"

    package="com.example.bluetooth"

    android:versionCode="1"

    android:versionName="1.0" >

    <uses-sdk

        android:minSdkVersion="8"

        android:targetSdkVersion="21" />

    <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=".BlueActivity"

            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>