Enable, disable and make discovrable bluetooth programmatically

You need to write few lines of code only, to enable or disable the bluetooth.
activity_main.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"
    tools:context=".MainActivity" >

    <TextView android:text="" 
        android:id="@+id/out" 
        android:layout_width="wrap_content" 
        android:layout_height="wrap_content"></TextView>
    <Button
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentTop="true"
        android:layout_marginLeft="30dp"
        android:layout_marginTop="49dp"
        android:text="TURN_ON" />

    <Button
        android:id="@+id/button2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/button1"
        android:layout_below="@+id/button1"
        android:layout_marginTop="27dp"
        android:text="DISCOVERABLE" />

    <Button
        android:id="@+id/button3"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/button2"
        android:layout_below="@+id/button2"
        android:layout_marginTop="28dp"
        android:text="TURN_OFF" />


</RelativeLayout>

Provide Permission:

<uses-permission android:name="android.permission.BLUETOOTH" />

<uses-permission android:name="android.permission.BLUETOOTH_ADMIN" />

MainActivity.java

public class MainActivity extends Activity {

private static final int REQUEST_ENABLE_BT = 0;

private static final int REQUEST_DISCOVERABLE_BT = 0;

 @Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

final TextView out=(TextView)findViewById(R.id.out);

final Button button1 = (Button) findViewById(R.id.button1);

final Button button2 = (Button) findViewById(R.id.button2);

final Button button3 = (Button) findViewById(R.id.button3);

final BluetoothAdapter mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();

if (mBluetoothAdapter == null) {

 out.append("device not supported");

}

button1.setOnClickListener(new View.OnClickListener() {

public void onClick(View v) {

if (!mBluetoothAdapter.isEnabled()) {

Intent enableBtIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);

startActivityForResult(enableBtIntent, REQUEST_ENABLE_BT);

            }

        }

    });

button2.setOnClickListener(new View.OnClickListener() {

@Override

 public void onClick(View arg0) {

if (!mBluetoothAdapter.isDiscovering()) {

//  out.append("MAKING YOUR DEVICE DISCOVERABLE");

Context context = getApplicationContext();

CharSequence text = "MAKING YOUR DEVICE DISCOVERABLE";

int duration = Toast.LENGTH_SHORT;

 Toast toast = Toast.makeText(context, text, duration);

toast.show();

Intent enableBtIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_DISCOVERABLE);

 startActivityForResult(enableBtIntent, REQUEST_DISCOVERABLE_BT);

                  

            }

        }

    });

 button3.setOnClickListener(new View.OnClickListener() {

 @Override

 public void onClick(View arg0) {   

mBluetoothAdapter.disable();

//  out.append("TURN_OFF BLUETOOTH");

Context context = getApplicationContext();

CharSequence text = "TURNING_OFF BLUETOOTH";

 int duration = Toast.LENGTH_LONG;

 Toast toast = Toast.makeText(context, text, 15);

 toast.show();

            }

    });

}

@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;

    }

}