Enable and Disable Bluetooth using Programatically in Android

In this Application, we will learn how to enable and disable bluetooth in android device using coding. We will show two methods to enable bluetooth:

1) Enable bluetooth without asking user permission. 

2) Enable bluetooth with user permission (a dialog box will open to confirm to enable bluetooth).

Use any one method as per your application requirement. Here, we are taking one single button and we will use it to enable and disable blue device. So, create new project and drop a button from widget to relative layout and give id button1. The code of android XML file is given below:

Enable and Disable Bluetooth

<RelativeLayoutxmlns: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:background="#024" >

<Button

   android:id="@+id/button1"

   android:layout_width="wrap_content"

   android:layout_height="wrap_content"

   android:layout_centerHorizontal="true"

   android:layout_centerVertical="true"

   android:onClick="action"

   android:text="Enable and disable bluetooth"

   android:textSize="18sp" />

</RelativeLayout>

Now open your Java file and initialize all objects. Simply use enable() and disable()method and we can use Intent to start bluetooth service which will ask permission to enable bluetooth. The code of android Java file is given below with explanation:

package com.smr;

import android.os.Bundle;

import android.view.View;

import android.widget.Toast;

import android.app.Activity;

import android.bluetooth.BluetoothAdapter;

public class MainActivity extends Activity {

  BluetoothAdapter bt=null;

  @Override

  protected void onCreate(Bundle savedInstanceState) {

   super.onCreate(savedInstanceState);

   setContentView(R.layout.activity_main);

   //initialize bluetooth adapter object

   bt=BluetoothAdapter.getDefaultAdapter();

  }

  //this method will call when we click on button

  public void action(View v)

  {

  //if bluetooth not found

  if(bt==null)

  {

   Toast.makeText(this, "No bluetooth found.."+bt, Toast.LENGTH_LONG).show();

   }

   else

   {

     if(!bt.isEnabled())

    {

     /*****first method to enable bluetooth*****/

     //enable bluetooth without pop-up any dialog box

     bt.enable();

     /*****Second method to enable bluetooth*****/

     //Pop-up dialog box to confirm to enable bluetooth

     /*Intent i=new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);

     startActivity(i); */

     //Display blutooth device value on Toast

     Toast.makeText(this, "bluetooth found.."+bt, Toast.LENGTH_LONG).show();

    }

    else

    {

     //disable bluetooth

     bt.disable();

    }

   }

  }

}

Now open your AndroidManifest.xml file to take permission to use bluetooth and changing the state of bluetooth. The code of AndroidManifest.xml fiel is given below: 

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

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

   package="innosen.com"

   android:versionCode="1"

   android:versionName="1.0" >

<uses-sdk

   android:minSdkVersion="10"

   android:targetSdkVersion="10" />

<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="sel.bil.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>

Now run your project and install .apk of this project in your android mobile and test application. This application can't test on the emulator but will not give error on emulator.