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Monday, 28 October 2013

Enable and Disable Bluetooth using Program 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 using Program in Android
Enable and Disable Bluetooth


<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: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 innosen.com;

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.
If you have any doubts please comment. Thanks... :)

4 comments:

  1. Thanks for sharing...

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  2. This comment has been removed by the author.

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  3. How is possible to save the first two lines in the hard disk and not use the http, when we have not internet?

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