Practical No:=24

Title:=Develop a program for Bluetooth Connectivity

Rollno:=26 Batch:=B
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<?xml version="1.0" encoding="utf-8"?> android:layout_width="match_parent"
<LinearLayout android:layout_height="wrap_content"
xmlns:android="http://schemas.android.com/apk android:layout_marginTop="20dp">
/res/android"
android:layout_width="match_parent" <TextView
android:layout_height="match_parent" android:id="@+id/textView"
android:orientation="vertical" android:layout_width="match_parent"
android:padding="20dp" android:layout_height="wrap_content"
android:gravity="center" android:padding="12dp"
android:background="#E0E0E0"> android:textSize="16sp"

<Button android:background="@android:color/darker_gr
android:id="@+id/btnOn" ay"
android:layout_width="match_parent"
android:layout_height="wrap_content" android:textColor="@android:color/white"/>
android:text="Turn Bluetooth ON" </ScrollView>
android:padding="10dp"/>
</LinearLayout>
<Button package com.example.bluetooth_connectivity;
android:id="@+id/btnOff"
android:layout_width="match_parent" import android.bluetooth.BluetoothAdapter;
android:layout_height="wrap_content" import android.bluetooth.BluetoothDevice;
android:text="Turn Bluetooth OFF" import android.content.Intent;
android:padding="10dp"/> import android.content.pm.PackageManager;
import android.os.Bundle;
<Button import android.view.View;
android:id="@+id/btnDiscover" import android.widget.Button;
android:layout_width="match_parent" import android.widget.TextView;
android:layout_height="wrap_content" import android.widget.Toast;
android:text="Make Discoverable"
android:padding="10dp"/> import
androidx.appcompat.app.AppCompatActivity;
<Button import androidx.core.app.ActivityCompat;
android:id="@+id/btnShow"
android:layout_width="match_parent" import java.util.Set;
android:layout_height="wrap_content"
android:text="Show Paired Devices" public class MainActivity extends
android:padding="10dp"/> AppCompatActivity {
Button btnOn, btnOff, btnDiscover, btnShow;
<ScrollView TextView tvDevices;
 BluetoothAdapter bluetoothAdapter; //
Set<BluetoothDevice> pairedDevices; ActivityCompat#requestPermissions
// here to request the missing
@Override permissions, and then overriding
protected void onCreate(Bundle // public void
savedInstanceState) { onRequestPermissionsResult(int requestCode,
super.onCreate(savedInstanceState); String[] permissions,
setContentView(R.layout.activity_main); // int[]
grantResults)
// Initialize UI elements // to handle the case where the user
tvDevices = findViewById(R.id.textView); grants the permission. See the documentation
btnOn = findViewById(R.id.btnOn); // for
btnOff = findViewById(R.id.btnOff); ActivityCompat#requestPermissions for more
btnDiscover = details.
findViewById(R.id.btnDiscover); return;
btnShow = findViewById(R.id.btnShow); }
bluetoothAdapter.disable();
// Get Bluetooth Adapter showToast("Bluetooth Turned OFF");
bluetoothAdapter = });
BluetoothAdapter.getDefaultAdapter();
// Discoverable Mode
// Turn Bluetooth ON btnDiscover.setOnClickListener(v -> {
btnOn.setOnClickListener(v -> { Intent discoverIntent = new
if (!bluetoothAdapter.isEnabled()) { Intent(BluetoothAdapter.ACTION_REQUEST_
Intent intent = new DISCOVERABLE);
Intent(BluetoothAdapter.ACTION_REQUEST_E if
NABLE); (ActivityCompat.checkSelfPermission(this,
startActivityForResult(intent, 0); android.Manifest.permission.BLUETOOTH_AD
showToast("Turning Bluetooth VERTISE) !=
ON..."); PackageManager.PERMISSION_GRANTED) {
} else { return;
showToast("Bluetooth is already }
ON"); startActivityForResult(discoverIntent, 0);
} showToast("Discovering Bluetooth
}); Devices...");
});
// Turn Bluetooth OFF
btnOff.setOnClickListener(v -> { // Show Paired Devices
if btnShow.setOnClickListener(v -> {
(ActivityCompat.checkSelfPermission(this, if (bluetoothAdapter.isEnabled()) {
android.Manifest.permission.BLUETOOTH_CO tvDevices.setText("Paired
NNECT) != Devices:\n");
PackageManager.PERMISSION_GRANTED) { if
// TODO: Consider calling (ActivityCompat.checkSelfPermission(this,
android.Manifest.permission.BLUETOOTH_CO TH"/>
NNECT) != <uses-permission
PackageManager.PERMISSION_GRANTED) { android:name="android.permission.BLUETOO
return; TH_ADMIN"/>
} <uses-permission
pairedDevices = android:name="android.permission.BLUETOO
bluetoothAdapter.getBondedDevices(); TH_ADVERTISE"/>
<uses-permission
if (!pairedDevices.isEmpty()) { android:name="android.permission.BLUETOO
for (BluetoothDevice device : TH_CONNECT"/>
pairedDevices) { <uses-permission
tvDevices.append("\nDevice: " + android:name="android.permission.BLUETOO
device.getName() + " (" + device.getAddress() + TH_SCAN"/>
")");
} <application
} else { android:allowBackup="true"
tvDevices.append("\nNo Paired android:icon="@mipmap/ic_launcher"
Devices Found"); android:label="@string/app_name"
}
} else { android:roundIcon="@mipmap/ic_launcher_rou
showToast("Please enable Bluetooth nd"
first!"); android:supportsRtl="true"
}
}); android:theme="@style/Theme.Bluetooth_Conn
} ectivity"
private void showToast(String message) { tools:targetApi="31">
Toast.makeText(this, message,
Toast.LENGTH_SHORT).show(); <activity
} android:name=".MainActivity"
} android:exported="true">
<?xml version="1.0" encoding="utf-8"?> <intent-filter>
<manifest <action
xmlns:android="http://schemas.android.com/apk android:name="android.intent.action.MAIN" />
/res/android" <category
android:name="android.intent.category.LAUNC
xmlns:tools="http://schemas.android.com/tools" HER" />
> </intent-filter>
</activity>
<!-- Bluetooth Permissions --> </application>
<uses-permission
android:name="android.permission.BLUETOO </manifest>
OUTPUT:=