第一个应用程序循环环境音频。开始歌曲的四个按钮。当它运行时，它只播放两个按钮，其他两个不起作用。第五个按钮（按钮6）暂停所有音频。我只想播放一个声音，直到按下或暂停一个新的声音，并且当按下一个新的声音时，前一个停止，所以它不会同时播放两个声音(还有一个链接按钮，但我不知道是否有干扰）
谢谢

//main.java
    public class MainActivity extends AppCompatActivity {
        Button button6, buttonLink, buttonFire, buttonWind, buttonWater,buttonEarth;
        boolean isPlaying = false;
        MediaPlayer mediaPlayer, mediaPlayer1, mediaPlayer2, mediaPlayer3, mediaPlayer0;

        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
            getSupportActionBar().hide();
            button6 = findViewById(R.id.button6);
            buttonLink = findViewById(R.id.buttonLink);
            buttonFire = findViewById(R.id.buttonFire);
            buttonWind = findViewById(R.id.buttonWind);
            buttonWater= findViewById(R.id.buttonWater);
            buttonEarth= findViewById(R.id.buttonEarth);

            mediaPlayer = MediaPlayer.create(this, R.raw.android_earth);
            mediaPlayer1 = MediaPlayer.create(this, R.raw.android_fire);
            mediaPlayer2 = MediaPlayer.create(this, R.raw.android_water);
            mediaPlayer3 = MediaPlayer.create(this, R.raw.android_wind);
            mediaPlayer0 = MediaPlayer.create(this, R.raw.soundvoid);

            button6.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    if (isPlaying) {
                        mediaPlayer.pause();
                        mediaPlayer2.pause();
                        mediaPlayer3.pause();
                        mediaPlayer1.pause();
                    }
                }});
            buttonFire.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    if (isPlaying) {
                        mediaPlayer.pause();
                        mediaPlayer3.pause();
                        mediaPlayer2.pause();
                        mediaPlayer0.pause();
                        mediaPlayer1.start();
                        mediaPlayer1.setLooping(true);
                    }else if(!isPlaying){
                        mediaPlayer1.start();
                        mediaPlayer1.setLooping(true);
                        isPlaying = true;
                    }}});
            buttonWind.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    if (isPlaying) {
                        mediaPlayer.pause();
                        mediaPlayer1.pause();
                        mediaPlayer2.pause();
                        mediaPlayer0.pause();
                        mediaPlayer3.start();
                        mediaPlayer3.setLooping(true);

                    }else if(!isPlaying){
                        mediaPlayer3.start();
                        mediaPlayer3.setLooping(true);
                        isPlaying = true;
                    }}});
            buttonWater.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    if (isPlaying) {
                        mediaPlayer.pause();
                        mediaPlayer1.pause();
                        mediaPlayer3.pause();
                        mediaPlayer0.pause();
                        mediaPlayer2.start();
                        mediaPlayer2.setLooping(true);
                    }else if(!isPlaying){
                        mediaPlayer2.start();
                        mediaPlayer2.setLooping(true);
                        isPlaying = true;
                    }}});
            buttonEarth.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    if (isPlaying) {
                        mediaPlayer1.pause();
                        mediaPlayer2.pause();
                        mediaPlayer3.pause();
                        mediaPlayer0.pause();
                        mediaPlayer.start();
                        mediaPlayer.setLooping(true);
                    }else if(!isPlaying){
                        mediaPlayer.start();
                        mediaPlayer.setLooping(true);
                        isPlaying = true;
                    }}});
        }

    ////////////////Boton link
        public void open(View view){
            Intent browserIntent = new Intent (Intent.ACTION_VIEW, Uri.parse("https://linktr.ee/MisCreaciones"));
            startActivity(browserIntent);
        }
    }

//main.xml
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 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"
    android:background="@drawable/aplicacion_background"
    tools:context=".MainActivity" >

    <Button
        android:id="@+id/button6"
        android:layout_width="105dp"
        android:layout_height="122dp"
        android:background="?android:attr/selectableItemBackground"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <Button
        android:id="@+id/buttonLink"
        android:layout_width="158dp"
        android:layout_height="62dp"
        android:layout_marginStart="252dp"
        android:layout_marginTop="668dp"
        android:background="?android:attr/selectableItemBackground"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <Button
        android:id="@+id/buttonFire"
        android:layout_width="193dp"
        android:layout_height="329dp"
        android:background="?android:attr/selectableItemBackground"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.0"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.0" />

    <Button
        android:id="@+id/buttonWind"
        android:layout_width="192dp"
        android:layout_height="327dp"
        android:background="?android:attr/selectableItemBackground"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.0"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.96" />

    <Button
        android:id="@+id/buttonWater"
        android:layout_width="196dp"
        android:layout_height="324dp"
        android:background="?android:attr/selectableItemBackground"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.995"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.0" />

    <Button
        android:id="@+id/buttonEarth"
        android:layout_width="197dp"
        android:layout_height="281dp"
        android:layout_marginStart="12dp"
        android:background="?android:attr/selectableItemBackground"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.995"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.88" />

</androidx.constraintlayout.widget.ConstraintLayout>