Program on Turning ON,OFF and Enable device Discoverable in Bluetooth on Android devices

I have used button and switch .

activity_main.xml(using Button)

<RelativeLayout 
    android:id="@+id/activity_main"    android:layout_width="match_parent"    android:layout_height="match_parent"   tools:context=".MainActivity">

    <TextView        android:text=""        android:layout_width="match_parent"        android:layout_height="100dp"        android:layout_alignParentTop="true"        android:layout_marginTop="281dp"        android:id="@+id/textView" />

    <Button        android:text="TURN_ON"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_marginTop="41dp"        android:id="@+id/button"        android:layout_alignParentTop="true"        android:layout_alignParentLeft="true"        android:layout_alignParentStart="true" />

    <Button        android:text="DISCOVERABLE"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_alignTop="@+id/button"        android:layout_toRightOf="@+id/button"        android:layout_toEndOf="@+id/button"        android:layout_marginLeft="10dp"        android:layout_marginStart="10dp"        android:id="@+id/button2" />

    <Button        android:text="TURN_OFF"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_alignTop="@+id/button2"        android:layout_toRightOf="@+id/button2"        android:layout_toEndOf="@+id/button2"        android:layout_marginLeft="12dp"        android:layout_marginStart="12dp"        android:id="@+id/button3" />

    <ImageView        android:layout_width="wrap_content"        android:layout_height="wrap_content"        app:srcCompat="@mipmap/ic_launcher"        android:layout_alignTop="@+id/textView"        android:id="@+id/imgv"        android:layout_alignRight="@+id/button3"        android:layout_alignEnd="@+id/button3"        android:layout_alignBottom="@+id/textView" />

</RelativeLayout>

discoverswitch.xml(using Switch)

<RelativeLayout 
    android:id="@+id/discoverswitch"    android:layout_width="match_parent"    android:layout_height="match_parent"    tools:context=".discoverswitch">

    <Switch        android:text="ON/OFF"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_alignBottom="@+id/textView2"        android:layout_alignParentRight="true"        android:layout_alignParentEnd="true"        android:layout_marginRight="48dp"        android:layout_marginEnd="48dp"        android:id="@+id/switch1" />

    <TextView        android:text="Bluetooth"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_marginLeft="20dp"        android:layout_marginStart="20dp"        android:layout_marginTop="19dp"        android:id="@+id/textView2"        android:layout_alignParentTop="true"        android:layout_alignParentLeft="true"        android:layout_alignParentStart="true" />

    <TextView        android:text="Discover Devices"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_below="@+id/textView2"        android:layout_alignLeft="@+id/textView2"        android:layout_alignStart="@+id/textView2"        android:layout_marginTop="67dp"        android:id="@+id/textView3" />

    <Switch        android:text="ON/OFF"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_alignTop="@+id/textView3"        android:layout_alignRight="@+id/switch1"        android:layout_alignEnd="@+id/switch1"        android:id="@+id/switch2" />

    <ListView        android:layout_width="match_parent"        android:layout_height="320dp"        android:layout_alignParentBottom="true"        android:layout_centerHorizontal="true"        android:id="@+id/listview"/>

</RelativeLayout>

MainActivity.java


public class MainActivity extends AppCompatActivity {
    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.textView);
        final Button Turn_On = (Button) findViewById(R.id.button);
        final Button Discover = (Button) findViewById(R.id.button2);
        final Button Turn_Off = (Button) findViewById(R.id.button3);
        final BluetoothAdapter BAdapter = BluetoothAdapter.getDefaultAdapter();
        if (BAdapter == null) {
            out.append("Device not Supported");
        }
        Turn_On.setOnClickListener(new View.OnClickListener() {
            @Override            public void onClick(View view) {
                if (!BAdapter.isEnabled()) {
                    Intent enableBIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
                    startActivityForResult(enableBIntent, REQUEST_ENABLE_BT);
                }
            }
        });
        Discover.setOnClickListener(new View.OnClickListener() {
            @Override            public void onClick(View view) {
                if (!BAdapter.isDiscovering()) {
                    Toast.makeText(getApplicationContext(), "Making your Device Discoverable", Toast.LENGTH_LONG).show();
                    Intent enableBIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_DISCOVERABLE);
                    startActivityForResult(enableBIntent, REQUEST_DISCOVERABLE_BT);
                }
            }
        });
        Turn_Off.setOnClickListener(new View.OnClickListener() {
            @Override            public void onClick(View view) {
                BAdapter.disable();
                Toast.makeText(getApplicationContext(), "Turning Off Bluetooth", Toast.LENGTH_LONG).show();
            }
        });

    }
    @Override    public boolean onCreateOptionsMenu(Menu menu)
    {
        getMenuInflater().inflate(R.menu.menu_main,menu);
        return true;
    }
    @Override    public boolean onOptionsItemSelected(MenuItem item)
    {
        switch(item.getItemId())
        {
            case R.id.item1:
                Intent i=new Intent(getApplicationContext(),discoverswitch.class);
                startActivity(i);
                return true;
            case R.id.item2:
                ImageView imgview=(ImageView)findViewById(R.id.imgv);
                imgview.setImageResource(R.drawable.apple);
                return true;
            default:
                return super.onOptionsItemSelected(item);
        }
    }
}

discoverswitch.java


public class discoverswitch extends Activity {
Set paired;

    @Override    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.discoverswitch);
        final Switch onoffswitch=(Switch)findViewById(R.id.switch1);
        final Switch discoverswitch=(Switch)findViewById(R.id.switch2);
        final BluetoothAdapter Badapter=BluetoothAdapter.getDefaultAdapter();
       final ListView listView=(ListView)findViewById(R.id.listview);
        onoffswitch.setChecked(true);
        if(Badapter==null)
        {
            Toast.makeText(getApplicationContext(),"This Device not supported",Toast.LENGTH_LONG).show();
        }
        onoffswitch.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
            @Override            public void onCheckedChanged(CompoundButton compoundButton, boolean b) {
                if(b){
                    if(!Badapter.isEnabled())
                    {
                        Intent turnon=new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
                        startActivityForResult(turnon,0);
                    }
                    else                    {
                        Toast.makeText(getApplicationContext(),"Bluetooth is Already turned ON",Toast.LENGTH_LONG).show();
                    }
                }
                else                {
                    Badapter.disable();
                    Toast.makeText(getApplicationContext(),"Bluetooth is turned OFF",Toast.LENGTH_LONG).show();
                }
            }
        });
        discoverswitch.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
            @Override            public void onCheckedChanged(CompoundButton compoundButton, boolean b) {
                if(b)
                {
                    if(!Badapter.isDiscovering())
                    {
                        Intent discovering=new Intent(BluetoothAdapter.ACTION_REQUEST_DISCOVERABLE);
                        startActivityForResult(discovering,0);

                        try{
                            paired=Badapter.getBondedDevices();
                            ArrayList list= new ArrayList();
                            for(BluetoothDevice btd: paired)
                                list.add(btd.getName());
                            Toast.makeText(getApplicationContext(),"Paired Devices",Toast.LENGTH_LONG).show();
                            ArrayAdapter adapter=new ArrayAdapter(getApplicationContext(),android.R.layout.simple_list_item_1,list);
                            listView.setAdapter(adapter);
                        }
                        catch(Exception e)
                        {
                            Toast.makeText(getApplicationContext(),"No bluetooth Device found",Toast.LENGTH_LONG).show();
                        }
                    }
                    else                    {
                        Toast.makeText(getApplicationContext(),"Sorry Unable to discover",Toast.LENGTH_LONG).show();
                    }
                }
                else                {
                    Toast.makeText(getApplicationContext(),"Discover is not turned on",Toast.LENGTH_LONG).show();
                }
            }
        });
    }

}

I have added options menu in Action bar for changing to switch mode.







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