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
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.
![Android]()
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 the "Next" button.
![Next]()
Now, select the version of Android and select the target Android devices.
![Android devices]()
Step 3. Now, add the activity and click the "Next" button.
![Activity]()
Add the activity name and click "Finish".
![Finish]()
Step 4. Go to activity_main.xml. This XML file contains the design code for your Android app.
![XML file]()
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" />
<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.
![Java program]()
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.
![Bluetooth Permission]()
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.
![Make Project]()
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.
![virtual Machine]()
Conclusion
We have successfully created a Bluetooth Android application using Android Studio.
![Android application]()
![Allow]()
![Coverage]()