Create Bluetooth Android Application Using Android Studio

The Java code is given below.

package abu.bluetooth;
import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.bluetooth.BluetoothAdapter;
import android.content.Context;
import android.content.Intent;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;
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 = findViewById(R.id.out);
        final Button button1 = findViewById(R.id.button1);
        final Button button2 = findViewById(R.id.button2);
        final Button button3 = 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()) {
                    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();
                Context context = getApplicationContext();
                CharSequence text = "TURNING_OFF BLUETOOTH";
                int duration = Toast.LENGTH_LONG;
                Toast toast = Toast.makeText(context, text, duration);
                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;
    }
}

Step 6. We need to make a Bluetooth request. So, add the Bluetooth permission in AndroidManifest.xml.

The AndroidManifest.xml code is given below.

<?xml version="1.0" encoding="utf-8"?>  
<manifest xmlns:android="http://schemas.android.com/apk/res/android"  
    package="abu.bluetooth">  
    <uses-permission android:name="android.permission.BLUETOOTH" />  
    <uses-permission android:name="android.permission.BLUETOOTH_ADMIN" />  
    <application  
        android:allowBackup="true"  
        android:icon="@mipmap/ic_launcher"  
        android:label="@string/app_name"  
        android:roundIcon="@mipmap/ic_launcher_round"  
        android:supportsRtl="true"  
        android:theme="@style/AppTheme">  
        <activity android:name=".MainActivity">  
            <intent-filter>  
                <action android:name="android.intent.action.MAIN" />  
                <category android:name="android.intent.category.LAUNCHER" />  
            </intent-filter>  
        </activity> 
    </application>  
</manifest>

Step 7. Now, go to the menu bar and click "Make Project" or press ctrl+f9 to debug the app from errors.

Step 8. Then, click the "Run" button or press shift+f10 to finally run the project. And, choose the "virtual machine" option and click OK.

Conclusion

We have successfully created a Bluetooth Android application using Android Studio.