The moment I bind a Samsung Android 10+ device using startBluetoothSco I loose audio. It works fine with other devices irrespective of Android version.
Sample code I tried with below.
Audio works as it should when i do not bind using startBluetoothSco. I did try changing the TTS audio between Samsung (default) and google. Nothing helps.
package com.example.ttssample;
import android.Manifest;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothProfile;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.content.pm.PackageManager;
import android.media.AudioManager;
import android.os.Build;
import android.os.Bundle;
import android.speech.RecognitionListener;
import android.speech.RecognizerIntent;
import android.speech.SpeechRecognizer;
import android.speech.tts.TextToSpeech;
import android.view.MotionEvent;
import android.view.View;
import android.widget.EditText;
import android.widget.Toast;
import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import androidx.core.app.ActivityCompat;
import androidx.core.content.ContextCompat;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.Locale;
public class MainActivity extends AppCompatActivity {
public static final Integer RecordAudioRequestCode = 1;
Intent speechRecognizerIntent;
private EditText editText;
private TextToSpeech textToSpeech;
private EditText editText2;
private SpeechRecognizer speechRecognizer;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
if (ContextCompat.checkSelfPermission(this, Manifest.permission.RECORD_AUDIO) != PackageManager.PERMISSION_GRANTED) {
checkPermission();
}
editText = findViewById(R.id.editText);
textToSpeech = new TextToSpeech(getApplicationContext(), i -> textToSpeech.setLanguage(Locale.ENGLISH));
editText2 = findViewById(R.id.editTextRecord);
speechRecognizer = SpeechRecognizer.createSpeechRecognizer(this);
speechRecognizerIntent = new Intent(RecognizerIntent.ACTION_RECOGNIZE_SPEECH);
speechRecognizerIntent.putExtra(RecognizerIntent.EXTRA_LANGUAGE_MODEL, RecognizerIntent.LANGUAGE_MODEL_FREE_FORM);
speechRecognizerIntent.putExtra(RecognizerIntent.EXTRA_LANGUAGE, Locale.getDefault());
speechRecognizer.setRecognitionListener(new RecognitionListener() {
@Override
public void onReadyForSpeech(Bundle bundle) {
}
@Override
public void onBeginningOfSpeech() {
}
@Override
public void onRmsChanged(float v) {
}
@Override
public void onBufferReceived(byte[] bytes) {
}
@Override
public void onEndOfSpeech() {
}
@Override
public void onError(int i) {
}
@Override
public void onResults(Bundle bundle) {
ArrayList<String> matches = bundle.getStringArrayList(SpeechRecognizer.RESULTS_RECOGNITION);
if (matches != null)
editText2.setText(matches.get(0));
}
@Override
public void onPartialResults(Bundle bundle) {
}
@Override
public void onEvent(int i, Bundle bundle) {
}
});
findViewById(R.id.btnRecord).setOnTouchListener(new View.OnTouchListener() {
@Override
public boolean onTouch(View view, MotionEvent motionEvent) {
switch (motionEvent.getAction()) {
case MotionEvent.ACTION_UP:
speechRecognizer.stopListening();
editText2.setHint("You will see the input here");
break;
case MotionEvent.ACTION_DOWN:
editText2.setText("");
editText2.setHint("Listening...");
speechRecognizer.startListening(speechRecognizerIntent);
break;
}
return false;
}
});
}
private void checkPermission() {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.RECORD_AUDIO}, RecordAudioRequestCode);
}
}
public void TextToSpeechButton(View view) {
textToSpeech.speak(editText.getText().toString(), TextToSpeech.QUEUE_FLUSH, null, null);
}
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
if (requestCode == RecordAudioRequestCode && grantResults.length > 0) {
if (grantResults[0] == PackageManager.PERMISSION_GRANTED)
Toast.makeText(this, "Permission Granted", Toast.LENGTH_SHORT).show();
}
}
public void doBind(View view) {
redirectToBTHeadset();
}
private void redirectToBTHeadset() {
final AudioManager localAudioManager = (AudioManager) getSystemService(Context.AUDIO_SERVICE);
if (localAudioManager.isBluetoothScoOn())
return;
BluetoothAdapter btAdapter = BluetoothAdapter.getDefaultAdapter();
if (btAdapter != null && btAdapter.isEnabled() && btAdapter.getProfileConnectionState(BluetoothProfile.HEADSET) == BluetoothProfile.STATE_CONNECTED) {
if (localAudioManager.isBluetoothScoAvailableOffCall()) {
Bundle extrasBundle = registerReceiver(new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
int conState = intent.getExtras().getInt(AudioManager.EXTRA_SCO_AUDIO_STATE);
if (conState == AudioManager.SCO_AUDIO_STATE_CONNECTED) {
localAudioManager.setBluetoothScoOn(true);
context.unregisterReceiver(this);
} else {
if (conState == AudioManager.SCO_AUDIO_STATE_CONNECTING) {
System.out.println("Bluetooth Receiver :SCO Connecting....");
} else if (conState == AudioManager.SCO_AUDIO_STATE_ERROR) {
System.out.println("Bluetooth Receiver : SCO Error.");
context.unregisterReceiver(this);
} else if (conState == AudioManager.SCO_AUDIO_STATE_DISCONNECTED) {
System.out.println("Bluetooth Receiver :SCO Disconnected");
localAudioManager.setBluetoothScoOn(false);
}
}
}
}, new IntentFilter(AudioManager.ACTION_SCO_AUDIO_STATE_UPDATED)).getExtras();
Iterator<String> iter = extrasBundle.keySet().iterator();
while (iter.hasNext()) {
String key = iter.next();
System.out.println("Bluetooth Receiver Key :" + key + ", value: " + extrasBundle.get(key));
}
if (extrasBundle.getInt(AudioManager.EXTRA_SCO_AUDIO_STATE) != 2) {
localAudioManager.setMode(AudioManager.MODE_IN_CALL);
localAudioManager.startBluetoothSco();
}
}
}
}
public void doUnBind(View view) {
stopBluetoothSco();
}
private void stopBluetoothSco() {
System.out.println("stopBluetoothSco called");
AudioManager localAudioManager = (AudioManager) getSystemService(Context.AUDIO_SERVICE);
localAudioManager.setMode(AudioManager.MODE_NORMAL);
localAudioManager.setSpeakerphoneOn(true);
localAudioManager.setBluetoothScoOn(false);
localAudioManager.stopBluetoothSco();
}
}
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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=".MainActivity">
<Button
android:id="@+id/button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="120dp"
android:layout_marginTop="60dp"
android:onClick="TextToSpeechButton"
android:text="@string/text_to_speech" />
<EditText
android:id="@+id/editText"
android:layout_width="360dp"
android:layout_height="wrap_content"
android:layout_marginStart="20dp"
android:layout_marginTop="150dp"
android:ems="10"
android:gravity="start|top"
android:hint="@string/your_text_here"
android:text="Hello"
android:inputType="textMultiLine"
android:autofillHints="" />
<EditText
android:id="@+id/editTextRecord"
android:layout_width="360dp"
android:layout_height="wrap_content"
android:layout_marginStart="20dp"
android:layout_marginTop="300dp"
android:ems="10"
android:inputType="textPersonName" />
<Button
android:id="@+id/btnRecord"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="120dp"
android:layout_marginTop="400dp"
android:text="Click to Record" />
<Button
android:id="@+id/btnBind"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="120dp"
android:layout_marginTop="500dp"
android:onClick="doBind"
android:text="Bind" />
<Button
android:id="@+id/btnUnBind"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="120dp"
android:layout_marginTop="600dp"
android:onClick="doUnBind"
android:text="Unbind" />
</RelativeLayout>