Play audio only once - android-studio

Question

I have an audio in the Main Activity and it is played every time I enter the Main Activity. I want it to play only once, regardless of whether you switch screens and come back! I want him to plays only the first time he enters the Main Activity and the other times he is null!
" '#SuppressLint("SetTextI18n")
private void getTimeFromAndroid() {
Calendar c = Calendar.getInstance();
timeOfDay = c.get(Calendar.HOUR_OF_DAY);
if(timeOfDay >= 0 && timeOfDay < 12) {
setBrightness(brilhoManha + 155);
saudacao.setText("BOM DIA, SEJA BEM-VINDO");
new Timer().schedule(new TimerTask() {
#Override
public void run() {
if (!flag) {
play = MediaPlayer.create(MainActivity.this, R.raw.audiobomdia);
play.start();
}
}
}, 2000);
}else if(timeOfDay >= 12 && timeOfDay < 18){
setBrightness(brilhoManha + 155);
saudacao.setText("BOA TARDE, SEJA BEM-VINDO");
new Timer().schedule(new TimerTask() {
#Override
public void run() {
if (!flag) {
play = MediaPlayer.create(MainActivity.this, R.raw.audioboatarde);
viewPager = findViewById(R.id.main);
}
}
}, 2000);
}else if(timeOfDay >= 18 && timeOfDay < 24){
saudacao.setText("BOA NOITE, SEJA BEM-VINDO");
setBrightness(brilhoNoite + 60);
new Timer().schedule(new TimerTask() {
#Override
public void run() {
if (!flag) {
play = MediaPlayer.create(MainActivity.this, R.raw.audioboanoite);
viewPager = findViewById(R.id.main);
}
}
}, 2000);
}else if(timeOfDay >= 0 && timeOfDay < 6){
saudacao.setText("BOA NOITE, SEJA BEM-VINDO");
setBrightness(brilhoNoite+60);
new Timer().schedule(new TimerTask() {
#Override
public void run() {
if (!flag) {
play = MediaPlayer.create(MainActivity.this, R.raw.audioboanoite);
viewPager = findViewById(R.id.main);
}
}
}, 2000);
}
} '"
This is my code in Main Activity, it is used to play an audio and a greeting message appears according to the time.

Answer 1

EDIT :
remove public int status = 0 from MainActivity. then create class G and add public static int status = 0 . that must be static :
public class G extends Application{
public static int status = 0;
public static SharedPreferences preferences;
#Override
public void onCreate() {
super.onCreate();
// if you want to not play even
// after exit from app, add these too
preferences = PreferenceManager.getDefaultSharedPreferences(this);
status = preferences.getInt("STATUS", 0);
}
}
then add android:name="your package name.G" to manifest in application block
like this :
<application
android:name="your package name.G"
android:icon="#drawable/ic_launcher"
android:label="#string/app_name"
android:theme="#style/AppTheme" >
then add this where that audio playing in MainActivity :
if(G.status==0) {
//write codes to play audio
G.status = 1;
}
if you want to not play even after exit from app, add this method to onCreate MainActivity :
#Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
if (keyCode == KeyEvent.KEYCODE_BACK) {
preferences.edit().putInt("STATUS", G.status).apply();
}
return super.onKeyDown(keyCode, event);
}