停止RecyclerViewMediaPlayer中的上一個專案-有解無憂

我有一個RecyclerView，其中每個專案都包含一個按鈕，可以播放來自在線 url 的聲音。

問題是我不希望這些專案同時播放聲音，當您單擊不同的聲音時，前一個聲音會響起，但我不知道該怎么做？

如果您能指導我解決這個問題，我將不勝感激

public class VersionAdapter3 extends RecyclerView.Adapter<VersionAdapter3.VersionViewholder> {

Context context;
List<Version3> versionsList;
final Mediaplayer mediaplayer=new Mediaplayer();




public VersionAdapter3(Context context, List<Version3> versionsList) {
    this.context = context;
    this.versionsList = versionsList;

}

  @NonNull
@Override
public VersionViewholder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
    View view= LayoutInflater.from(parent.getContext()).inflate(R.layout.raw3,parent,false);
    return new VersionViewholder(view);
}

@Override
public void onBindViewHolder(@NonNull VersionViewholder holder, int position) {
    Version3 version3 = versionsList.get(position);
    holder.codeNameTxt.setText(version3.getCodeName());
    holder.versionTxt.setText(version3.getVersion());
    holder.descriptiontxt.setText(version3.getDescription());


    mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
   try {
        mediaPlayer.reset();
        mediaPlayer.setDataSource(version3.getSong());
    } catch (IOException e) {
        e.printStackTrace();
    }

    mediaPlayer.prepareAsync();




    boolean isExpandable = versionsList.get(position).isExpandable();
    holder.expandableLayout.setVisibility(isExpandable ? View.VISIBLE : View.GONE);

   holder.btnplay.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {


            if (mediaPlayer!=null) {
                if (mediaPlayer.isPlaying()) {
                    mediaPlayer.pause();
                    version3.setIsplaying(false);

                }

            }
            try {

                            if (holder.btnplay.getText().toString().equals("pause")) {
                                mediaPlayer.pause();
                                version3.setIsplaying(false);
                                holder.btnplay.setText("play");

                            }

                        else {

                             holder.btnplay.getText().toString().equals("play");
                                mediaPlayer.start();
                                holder.btnplay.setText("pause");
                                version3.setIsplaying(true);
                            }


            } catch (Exception e) {
                e.printStackTrace();
            }

                mediaPlayer.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {
                    @Override
                    public void onCompletion(MediaPlayer mediaPlayer) {
                        holder.btnplay.setText("play");
                    }
                });

            }

    });



}
@Override
public int getItemCount() {
    return versionsList.size();
}

public class VersionViewholder extends RecyclerView.ViewHolder {

    TextView codeNameTxt, versionTxt, descriptiontxt;
    LinearLayout linearLayout;
    RelativeLayout expandableLayout;
    Button btnplay;
    public VersionViewholder(@NonNull View itemView) {


        super(itemView);
   codeNameTxt = itemView.findViewById(R.id.codename);
        versionTxt = itemView.findViewById(R.id.version);
        descriptiontxt = itemView.findViewById(R.id.description);
        btnplay = itemView.findViewById(R.id.track_play);
        linearLayout = itemView.findViewById(R.id.linear);
        expandableLayout = itemView.findViewById(R.id.expandable);


        linearLayout.setOnClickListener(new View.OnClickListener() {
            @Override
           public void onClick(View view) {
                Version3 version3 = versionsList.get(getAdapterPosition());
                version3.setExpandable(!version3.isExpandable());
                notifyItemChanged(getAdapterPosition());

            }
        });

    }
}

}

當我單擊每個專案時，它會展開并且前一個聲音會消失，但按鈕仍顯示為暫停模式而不是播放模式，我不希望在展開新專案時聲音消失，我希望它在什么時候消失我單擊下一個按鈕只是在您暫停上一個按鈕的情況下它可以作業，但是我希望它在我單擊新的播放按鈕并且上一個完全關閉時自動關閉如果您能幫助我修復我的問題，我將不勝感激代碼并告訴我如何編輯它

uj5u.com熱心網友回復：

這是一個例子：

MainActivity 類：

public class MainActivity extends AppCompatActivity {

    private RecyclerView recyclerView;
    private VersionAdapter3 adapter;

    private List<Version3> generateVersionList() {
        List<Version3> versionsList = new ArrayList<>();
        versionsList.add(new Version3("codeName 01", "version 01", "Description 01", "https://storage.googleapis.com/2waytech-apagar/Just a Miracle Apart - Lost European.mp3", Version3.State.STOPPED));
        versionsList.add(new Version3("codeName 02", "version 02", "Description 02", "https://storage.googleapis.com/2waytech-apagar/Newspaper And Lace - Lost European.mp3", Version3.State.STOPPED));
        versionsList.add(new Version3("codeName 03", "version 03", "Description 03", "https://storage.googleapis.com/2waytech-apagar/The Man in the House of Cards - Lost European.mp3", Version3.State.STOPPED));
        return versionsList;
    }

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        recyclerView = findViewById(R.id.list);

        LinearLayoutManager llm = new LinearLayoutManager(this);
        llm.setOrientation(LinearLayoutManager.VERTICAL);

        adapter = new VersionAdapter3(generateVersionList());

        recyclerView.setLayoutManager(llm);
        recyclerView.setAdapter(adapter);
    }
}

VersionAdapter3 類：

public class VersionAdapter3 extends RecyclerView.Adapter<VersionAdapter3.VersionViewHolder> {
    private final List<Version3> versionsList;
    private final MediaPlayer mediaPlayer;
    private Integer currentlyPlayingIndex = -1;

    public VersionAdapter3(List<Version3> versionsList) {
        this.versionsList = versionsList;
        this.mediaPlayer = new MediaPlayer();
        mediaPlayer.setOnCompletionListener(mediaPlayer -> {});
    }

    private void setupMediaPlayer() {
        mediaPlayer.setOnPreparedListener(MediaPlayer::start);
        mediaPlayer.setAudioAttributes(
                new AudioAttributes.Builder()
                        .setContentType(AudioAttributes.CONTENT_TYPE_MUSIC)
                        .setUsage(AudioAttributes.USAGE_MEDIA)
                        .build()
        );
    }

    private void onPlayBtnTapped(int newIndex) {

        if(newIndex != currentlyPlayingIndex && currentlyPlayingIndex != -1) {
            versionsList.get(currentlyPlayingIndex).setState(Version3.State.STOPPED);
            notifyItemChanged(currentlyPlayingIndex);
            mediaPlayer.stop();
        }

        if(newIndex == currentlyPlayingIndex) {
            if(mediaPlayer.isPlaying()) {
                versionsList.get(newIndex).setState(Version3.State.PAUSED);
                mediaPlayer.pause();
            }
            else {
                versionsList.get(newIndex).setState(Version3.State.PLAYING);
                mediaPlayer.start();
            }

        } else {

            try {
                currentlyPlayingIndex = newIndex;
                Version3 version = versionsList.get(newIndex);
                String dataSource = version.getSong();
                version.setState(Version3.State.PLAYING);
                mediaPlayer.reset();
                mediaPlayer.setDataSource(dataSource);
                mediaPlayer.prepareAsync();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }

        notifyItemChanged(newIndex);
    }

    @Override
    public void onViewAttachedToWindow(@NonNull VersionViewHolder holder) {
        super.onViewAttachedToWindow(holder);
        setupMediaPlayer();
    }

    @NonNull
    @Override
    public VersionViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.raw3, parent, false);
        return new VersionViewHolder(view);
    }

    @SuppressLint("SetTextI18n")
    @Override
    public void onBindViewHolder(@NonNull VersionViewHolder holder, int position) {

        Version3 version3 = versionsList.get(position);

        holder.codeNameTxt.setText(version3.getCodeName());
        holder.versionTxt.setText(version3.getVersion());
        holder.descriptiontxt.setText(version3.getDescription());
        holder.adjustBtnTextByState(version3.getState());
        holder.btnplay.setOnClickListener(view -> onPlayBtnTapped(position));
    }

    @Override
    public int getItemCount() {
        return versionsList.size();
    }

    public static class VersionViewHolder extends RecyclerView.ViewHolder {

        TextView codeNameTxt, versionTxt, descriptiontxt;
        Button btnplay;

        public VersionViewHolder(@NonNull View itemView) {
            super(itemView);
            codeNameTxt = itemView.findViewById(R.id.codename);
            versionTxt = itemView.findViewById(R.id.version);
            descriptiontxt = itemView.findViewById(R.id.description);
            btnplay = itemView.findViewById(R.id.track_play);
        }

        @SuppressLint("SetTextI18n")
        public void adjustBtnTextByState(Version3.State state) {
            switch (state) {
                case STOPPED:
                    btnplay.setText("stopped");
                    break;
                case PLAYING:
                    btnplay.setText("playing");
                    break;
                case PAUSED:
                    btnplay.setText("paused");
                    break;
            }
        }
    }

}

Version3 類

public class Version3 {

    private String codeName;
    private String version;
    private String description;
    private String song;
    private State state;

    public Version3(String codeName, String version, String description, String song, State state) {
        this.codeName = codeName;
        this.version = version;
        this.description = description;
        this.song = song;
        this.state = state;
    }

    public String getCodeName() {
        return codeName;
    }

    public void setCodeName(String codeName) {
        this.codeName = codeName;
    }

    public String getVersion() {
        return version;
    }

    public void setVersion(String version) {
        this.version = version;
    }

    public String getDescription() {
        return description;
    }

    public void setDescription(String description) {
        this.description = description;
    }

    public String getSong() {
        return song;
    }

    public void setSong(String song) {
        this.song = song;
    }

    public State getState() {
        return state;
    }

    public void setState(State state) {
        this.state = state;
    }

    public enum State {
        STOPPED, PLAYING, PAUSED
    }
}

main_activity.xml 布局檔案：

<?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"
    tools:context=".MainActivity">

    <androidx.recyclerview.widget.RecyclerView
        android:id="@ id/list"
        android:layout_width="match_parent"
        android:layout_height="match_parent"/>

</androidx.constraintlayout.widget.ConstraintLayout>

和 raw3.xml 布局檔案：

<?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"
    android:layout_width="match_parent"
    android:layout_height="wrap_content">

    <TextView
        android:id="@ id/codename"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="codename"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintWidth="match_parent" />

    <TextView
        android:id="@ id/version"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="4dp"
        android:text="version"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toBottomOf="@id/codename"
        app:layout_constraintWidth="match_parent" />

    <TextView
        android:id="@ id/description"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="4dp"
        android:text="description"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toBottomOf="@id/version"
        app:layout_constraintWidth="match_parent" />

    <Button
        android:id="@ id/track_play"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="stop"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toBottomOf="@id/description" />

</androidx.constraintlayout.widget.ConstraintLayout>

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