在RecyclerView中播放和释放音频 [英] Playing and Releasing audio in RecyclerView

问题描述

我正在学习android，目前正在学习RecyclerView，因此在此示例中，我要在单击播放按钮时播放特定的原始声音文件，然后在完成播放后将其释放. 我可能会在最佳做法上认真使用一些指针，但是由于我有一些问题和疑问，所以:

I'm learning android and currently RecyclerView, so in this example I'm playing a specific raw sound file when clicking a play button and then releasing it when it's done. I could seriously use some pointers on what is the best practice however as I have a few issues and questions:

• 我在转换状态时遇到问题，因此如果我快速按一下播放键，我会得到 IllegalStateException ，可能是因为试图释放已经释放的玩家.
• 我显然也应该在发布后将其无效，并事先进行 null 检查，但是由于我是在嵌套作用域中使用它，因此必须将其声明为final，并且不能将其设为null，这会造成混淆，我显然错过了一些东西.
与在 viewHolder 类的整个行中添加clickListner相比，
• 在 onBindViewHolder 中的项目上设置clickListner似乎也明显慢得多，而且响应速度也较慢.

• I have a problem with transiting states so if I press play very quickly I'll get an IllegalStateException, probably from trying to release an already released player.
• I should apparently also nullify after release and do a null check prior but since I'm using it in a nested scope it has to be declared final and can't be nulled which is confusing, I've obviously missed something.
• setting the clickListner on an item in onBindViewHolder also seems significantly slower and less responsive than adding a clickListner on the entire row in the viewHolder class.

使用RecyclerView设置mediaPlayer和正确管理资源的最佳实践是什么，我在做错什么会导致崩溃和缓慢"?

//ViewHolder

//ViewHolder

public static class myHolder extends RecyclerView.ViewHolder implements View.OnClickListener{


    ImageView playBtn;

    public myHolder(View v){
        super(v);
        playBtn = (ImageView) v.findViewById(R.id.playBtn);
        v.setOnClickListener(this);
    }

    @Override
    public void onClick(View v) {
    }

}

//onBindViewHolder/onCompletionListener

//onBindViewHolder / onCompletionListener

  @Override
public void onBindViewHolder(myHolder holder, int position) {
    myClass item = itemList.get(position);
    final MediaPlayer mediaPlayer = MediaPlayer.create(holder.itemView.getContext(), item.getAudioSource());

   holder.playBtn.setOnClickListener(new View.OnClickListener(){
        @Override
        public void onClick(View v) {

            mediaPlayer.start();
            mediaPlayer.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {
                @Override
                public void onCompletion(MediaPlayer mp) {
                    mp.release();
                }
            });
        }
    });
}

推荐答案

OBS在回答我自己的问题时，我不能说这是一种很好的做法，但是它确实解决了我遇到的问题，如果有人发现了一个问题，错误或有更好更好的方法，请发表答案并进行详细说明.

OBS As I'm answering my own question I can NOT say that this is acctualy good practice but it did solve the issues I was having, if anyone spots an error or has a better more efficient way then please post an answer and elaborate.

• 我没有在onBindViewHolder中声明MediaPlayer，而是将其设置为类变量，这使我避免将其定型，并在发布后将其无效.
• 然后我在onClick方法中定义了它，以确保它永远不会为null并始终在需要时进行声明.
• 为了在onClick中使用它们，我必须将其持有人和"item"定为决赛，但这似乎奏效了(我猜是recyclerView魔术)

该应用不再崩溃，onCompletionListener应该清除所有资源，这是当前代码:

The app no longer crashes and onCompletionListener should clear all resources, this is the current code:

//类变量mediaplayer和onCompletionListener方法

//class variable mediaplayer and onCompletionListener method

MediaPlayer mediaPlayer;

//onCompletionListener method
MediaPlayer.OnCompletionListener mCompletionListener = new MediaPlayer.OnCompletionListener() {
    @Override
    public void onCompletion(MediaPlayer mp) {
        mp.release();
        mediaPlayer = null;
    }
};

//onBindViewHolder

//onBindViewHolder

@Override
public void onBindViewHolder(final itemHolder holder, int position) {
    final Items item = mItemList.get(position);

    holder.playBtn.setOnClickListener(new View.OnClickListener(){
        @Override
        public void onClick(View v) {
            mediaPlayer = MediaPlayer.create(holder.itemView.getContext(), item.getAudioSource());
            if(mediaPlayer != null) {
                mediaPlayer.start();
                mediaPlayer.setOnCompletionListener(mCompletionListener);
            }
        }
    });
}

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