Bluetooth Example

-
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

Comments

Post a Comment

Popular posts from this blog

Manage External Storage Permission | Android Studio | Kotlin

-
Image
Manage External Storage Permission Previously (before Android 11) we only need to request the WRITE_EXTERNAL_STORAGE Permission to perform the storage-related tasks. But, now for Android 11 and above we have to request the MANAGE_EXTERNAL_STORAGE Permission to perform the storage-related tasks. Keep in mind that if you're 100% sure that your app requires this permission to work properly then request this permission otherwise Google will not allow you to publish/update your app. For example, if your app is WhatsApp Status Saver then you won't be allowed to use this permission as your app works with images and videos, not files. After permission is granted, I'll input a name and create a folder with that name just for example. You can do whatever you want instead. >>Check For Java Video Tutorial: Coding: AndroidManifest.xml <?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android= "http://schemas.android.com/apk/res/android"
Read more

Manage External Storage Permission | Android Studio | Java

-
Image
Manage External Storage Permission Previously (before Android 11) we only need to request the WRITE_EXTERNAL_STORAGE Permission to perform the storage-related tasks. But, now for Android 11 and above we have to request the MANAGE_EXTERNAL_STORAGE Permission to perform the storage-related tasks. Keep in mind that if you're 100% sure that your app requires this permission to work properly then request this permission otherwise Google will not allow you to publish/update your app. For example, if your app is WhatsApp Status Saver then you won't be allowed to use this permission as your app works with images and videos, not files. After permission is granted, I'll input a name and create a folder with that name just for example. You can do whatever you want instead. >>Check For Kotlin Video Tutorial: Coding: AndroidManifest.xml <?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android= "http://schemas.android.com/apk/res/android&qu
Read more

Add a Back Button to Action Bar Android Studio (Kotlin)

-
Image
      DESCRIPTION       In this tutorial we will add a back button in action bar, when it is clicked it will go to previous activity(the app will close if this was launcher activity). We will go from main activity to new activity by clicking button in main activity. In new activity we will add a back button to actionbar when that button is clicked the main activity will appear...       VIDEO             SOURCE CODE       Step 1:  Create a new Project  or  open new project Step 2: Create New Activity File>New>Activity>EmptyActivity Step 3: Code: activity_main.xml <?xml version="1.0" encoding="utf-8"?> <LinearLayout 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" a
Read more