If you are looking for code to programmatically check if Bluetooth is turned on or off on the Android device, then here are examples for both Java and Kotlin,
Java Example: Check if bluetoon is turned on or off
package com.code2care.demobluetooth;
import androidx.appcompat.app.AppCompatActivity;
import android.bluetooth.BluetoothAdapter;
import android.content.IntentFilter;
import android.os.Bundle;
import android.widget.Toast;
public class CheckBluetoothActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_demobluetooth);
Toast toast = Toast.makeText(CheckBluetoothActivity.this,
"Bluetooth Enabled: "+ isBluetoothEnabled() , Toast.LENGTH_SHORT);
toast.show();
}
//This method checks if bluetooth is
//enabled on the Android device or not
public boolean isBluetoothEnabled(){
BluetoothAdapter myBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
if(myBluetoothAdapter.isEnabled()){
return true;
} else {
return false;
}
}
}
Make sure you add the below permissions to access Bluetooth in your manifest XML file,
<uses-permission android:name="android.permission.BLUETOOTH" />|
If you don't add the above line you will get the below error,
java.lang.RuntimeException: Unable to start activity
ComponentInfo{com.code2care.testing/com.code2care.testing.MainActivity}:
java.lang.SecurityException: Need BLUETOOTH permission:
Neither user 10123 nor current process has android.permission.BLUETOOTH.
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2560)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2626)
at android.app.ActivityThread.-wrap11(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1475)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:766)
Caused by: java.lang.SecurityException: Need BLUETOOTH permission:
Neither user 10123 nor current process has android.permission.BLUETOOTH.
at android.os.Parcel.readException(Parcel.java:1599)
at android.os.Parcel.readException(Parcel.java:1552)
at android.bluetooth.IBluetooth$Stub$Proxy.isEnabled(IBluetooth.java:853)
at android.bluetooth.BluetoothAdapter.isEnabled(BluetoothAdapter.java:701)
at com.code2care.testing.MainActivity.isBluetoothEnabled(MainActivity.java:26)
at com.code2care.testing.MainActivity.onCreate(MainActivity.java:17)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:905)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:766)
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