Using BluetoothAdapter class we will do the following operations
a set containing list of all paired or bounded bluetooth devices.
Permissions Required: BLUETOOTH , BLUETOOTH_ADMIN
- Check if Bluetooth is available or not.
- Turn On/Off Bluetooth.
- Make Bluetooth Discoverable.
- Display Paired/Bounded devices.
a set containing list of all paired or bounded bluetooth devices.
Permissions Required: BLUETOOTH , BLUETOOTH_ADMIN
Step 1: Create a new project OR Open your project
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"/><applicationandroid: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"?><LinearLayoutxmlns: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--><TextViewandroid: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)--><ImageViewandroid:id="@+id/bluetoothIv"android:layout_width="100dp"android:layout_height="100dp" /><!--On Button--><Buttonandroid: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--><Buttonandroid: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--><Buttonandroid: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--><Buttonandroid: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--><TextViewandroid: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;@Overrideprotected 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);//adaptermBlueAdapter = BluetoothAdapter.getDefaultAdapter();//check if bluetooth is available or notif (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 clickmOnBtn.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {if (!mBlueAdapter.isEnabled()){showToast("Turning On Bluetooth...");//intent to on bluetoothIntent intent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);startActivityForResult(intent , REQUEST_ENABLE_BT);}else {showToast("Bluetooth is already on");}}});//discover bluetooth btn clickmDiscoverBtn.setOnClickListener(new View.OnClickListener() {@Overridepublic 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 clickmOffBtn.setOnClickListener(new View.OnClickListener() {@Overridepublic 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 clickmPairedBtn.setOnClickListener(new View.OnClickListener() {@Overridepublic 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 devicesshowToast("Turn on bluetooth to get paired devices");}}});}@Overrideprotected void onActivityResult(int requestCode , int resultCode , Intent data) {switch (requestCode){case REQUEST_ENABLE_BT:if (resultCode == RESULT_OK){//bluetooth is onmBlueIv.setImageResource(R.drawable.ic_action_on);showToast("Bluetooth is on");}else {//user denied to turn bluetooth onshowToast("could't on bluetooth");}break;}super.onActivityResult(requestCode , resultCode , data);}//toast message functionprivate void showToast(String msg){Toast.makeText(this , msg , Toast.LENGTH_SHORT).show();}}
Step 5: Run Project
Output
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