Bluetooth Example

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Using BluetoothAdapter class we will do the following operations
  • Check if Bluetooth is available or not.
  • Turn On/Off Bluetooth.
  • Make Bluetooth Discoverable.
  • Display Paired/Bounded devices.
Note: The getBoundedDevices() method of BluetoothAdapter class provides
a set containing list of all paired or bounded bluetooth devices.
Permissions Required: BLUETOOTH, BLUETOOTH_ADMIN

Bluetooth Example - Android Studio


Step 2: Add 2 Images to show Bluetooth status icons

Step 3: Add BLUETOOTH, BLUETOOTH_ADMIN permission in AndroidMenifest.xml

Step 4: Code

AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.blogspot.atifsoftwares.bluetoothexample">

    <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>

activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:gravity="center_horizontal"
    tools:context=".MainActivity">

    <!--Display whether bluetooth is available or not-->
    <TextView
        android:id="@+id/statusBluetoothTv"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text=""
        android:textAlignment="center"
        android:textSize="20sp"
        android:textColor="#000"/>
    <!--Bluetooth icon (on/off)-->
    <ImageView
        android:id="@+id/bluetoothIv"
        android:layout_width="100dp"
        android:layout_height="100dp" />
    <!--On Button-->
    <Button
        android:id="@+id/onBtn"
        android:minWidth="200dp"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Turn On"
        style="@style/Base.Widget.AppCompat.Button.Colored"/>
    <!--Off btn-->
    <Button
        android:id="@+id/offBtn"
        android:minWidth="200dp"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Turn Off"
        style="@style/Base.Widget.AppCompat.Button.Colored"/>
    <!--Discoverable button-->
    <Button
        android:id="@+id/discoverableBtn"
        android:minWidth="200dp"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Discoverable"
        style="@style/Base.Widget.AppCompat.Button.Colored"/>
    <!--Get list of paired devices button-->
    <Button
        android:id="@+id/pairedBtn"
        android:minWidth="200dp"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Get Paired Devices"
        style="@style/Base.Widget.AppCompat.Button.Colored"/>
    <!--Show paired devices here-->
    <TextView
        android:id="@+id/pairedTv"
        android:minWidth="200dp"
        android:text=""
        android:textColor="#000"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />

</LinearLayout>

MainActivity.java

package com.blogspot.atifsoftwares.bluetoothexample;

import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;

import java.util.Set;

public class MainActivity extends AppCompatActivity {

    private static final int REQUEST_ENABLE_BT = 0;
    private static final int REQUEST_DISCOVER_BT = 1;

    TextView mStatusBlueTv, mPairedTv;
    ImageView mBlueIv;
    Button mOnBtn, mOffBtn, mDiscoverBtn, mPairedBtn;

    BluetoothAdapter mBlueAdapter;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        mStatusBlueTv = findViewById(R.id.statusBluetoothTv);
        mPairedTv     = findViewById(R.id.pairedTv);
        mBlueIv       = findViewById(R.id.bluetoothIv);
        mOnBtn        = findViewById(R.id.onBtn);
        mOffBtn       = findViewById(R.id.offBtn);
        mDiscoverBtn  = findViewById(R.id.discoverableBtn);
        mPairedBtn    = findViewById(R.id.pairedBtn);

        //adapter
        mBlueAdapter = BluetoothAdapter.getDefaultAdapter();

        //check if bluetooth is available or not
        if (mBlueAdapter == null){
            mStatusBlueTv.setText("Bluetooth is not available");
        }
        else {
            mStatusBlueTv.setText("Bluetooth is available");
        }

        //set image according to bluetooth status(on/off)
        if (mBlueAdapter.isEnabled()){
            mBlueIv.setImageResource(R.drawable.ic_action_on);
        }
        else {
            mBlueIv.setImageResource(R.drawable.ic_action_off);
        }

        //on btn click
        mOnBtn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (!mBlueAdapter.isEnabled()){
                    showToast("Turning On Bluetooth...");
                    //intent to on bluetooth
                    Intent intent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
                    startActivityForResult(intent, REQUEST_ENABLE_BT);
                }
                else {
                    showToast("Bluetooth is already on");
                }
            }
        });
        //discover bluetooth btn click
        mDiscoverBtn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (!mBlueAdapter.isDiscovering()){
                    showToast("Making Your Device Discoverable");
                    Intent intent = new Intent(BluetoothAdapter.ACTION_REQUEST_DISCOVERABLE);
                    startActivityForResult(intent, REQUEST_DISCOVER_BT);
                }
            }
        });
        //off btn click
        mOffBtn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (mBlueAdapter.isEnabled()){
                    mBlueAdapter.disable();
                    showToast("Turning Bluetooth Off");
                    mBlueIv.setImageResource(R.drawable.ic_action_off);
                }
                else {
                    showToast("Bluetooth is already off");
                }
            }
        });
        //get paired devices btn click
        mPairedBtn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (mBlueAdapter.isEnabled()){
                    mPairedTv.setText("Paired Devices");
                    Set<BluetoothDevice> devices = mBlueAdapter.getBondedDevices();
                    for (BluetoothDevice device: devices){
                        mPairedTv.append("\nDevice: " + device.getName()+ ", " + device);
                    }
                }
                else {
                    //bluetooth is off so can't get paired devices
                    showToast("Turn on bluetooth to get paired devices");
                }
            }
        });


    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        switch (requestCode){
            case REQUEST_ENABLE_BT:
                if (resultCode == RESULT_OK){
                    //bluetooth is on
                    mBlueIv.setImageResource(R.drawable.ic_action_on);
                    showToast("Bluetooth is on");
                }
                else {
                    //user denied to turn bluetooth on
                    showToast("could't on bluetooth");
                }
                break;
        }
        super.onActivityResult(requestCode, resultCode, data);
    }

    //toast message function
    private void showToast(String msg){
        Toast.makeText(this, msg, Toast.LENGTH_SHORT).show();
    }

}

Step 5: Run Project

Output
Bluetooth Example

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