Create Bluetooth Android Application Using Android Studio

Introduction

Android is one of the most popular operating systems for mobile. In this article, I will show you how to create Bluetooth Android applications using Android Studio. 

Requirements

• Android Studio version 2.3.3
• Little bit XML and JAVA knowledge.
• Android Emulator (or) Android mobile
• Download link (Android Studio)

Steps to be followed -

Follow these steps to create a Bluetooth Android application. I have included the source code in the attachment.

Step 1

Open Android Studio and start a new Android Studio Project.

Step 2

You can choose your application name and choose where your project is to be stored. If you wish to use C++ for coding the project, mark the "Include C++ support", and click "Next" button.



Now, select the version of Android and select the target Android devices.

Step 3

Now, add the activity and click "Next" button.



Add activity name and click "Finish".

Step 4

Go to activity_main.xml. This XML file contains the designing code for your Android app.



The XML code is given below.

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"

    tools:context="abu.bluetooth.MainActivity" >
    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical">
        <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="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="COVERAGE" />
        <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="OFF" />
    </RelativeLayout>

</android.support.constraint.ConstraintLayout>

Step 5

Go to  Main Activity.java. This Java program is the backend language for your app.



The Java code is given below.

package abu.bluetooth;

import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.app.Activity;
import android.bluetooth.BluetoothAdapter;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
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 = (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()) {
                    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, 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;
    }

}

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 "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.