如何在 recyclerview 适配器类中发送广播？

Question

我有一个RecyclerView显示设备上找到的所有歌曲。

适配器类

holder.constraintLayout.setOnClickListener(new View.OnClickListener() {

        @Override

        public void onClick(View v) {

            //Store songList and songIndex in mSharedPreferences

            storageUtil.storeSong(Main.musicList);

            storageUtil.storeSongIndex(holder.getAdapterPosition());

            //Send media with BroadcastReceiver

            Intent broadCastReceiverIntent = new Intent(Constants.ACTIONS.BROADCAST_PlAY_NEW_SONG);

            sendBroadcast(broadCastReceiverIntent);

            Intent broadCastReceiverIntentUpdateSong = new Intent(Constants.ACTIONS.BROADCAST_UPDATE_SONG);

            sendBroadcast(broadCastReceiverIntentUpdateSong);

        }

    });

我想要实现的是，当在RecyclerView中单击一首歌曲时，一个广播被发送到我的服务类，因此一首歌曲开始播放。

sendBroadcast 无法解决，那么如何从我的适配器类发送广播意图？

我也想知道这是否是正确的方法，或者是否有更好的方法在适配器中发送广播，因为我在某处读到BroadcastReceivers不属于适配器类。

Answer 1

根本原因： sendBroadcast是Context类的方法，因为你在Adapter类中调用它，所以编译器显示错误“sendBroadcast 无法解析”。解决方案：从视图实例中获取上下文，然后调用sendBroadcast方法。holder.constraintLayout.setOnClickListener(new View.OnClickListener() {    @Override    public void onClick(View v) {        //Store songList and songIndex in mSharedPreferences        storageUtil.storeSong(Main.musicList);        storageUtil.storeSongIndex(holder.getAdapterPosition());        // Obtain context from view instance.        Context context = v.getContext();        //Send media with BroadcastReceiver        Intent broadCastReceiverIntent = new Intent(Constants.ACTIONS.BROADCAST_PlAY_NEW_SONG);        context.sendBroadcast(broadCastReceiverIntent);        Intent broadCastReceiverIntentUpdateSong = new Intent(Constants.ACTIONS.BROADCAST_UPDATE_SONG);        context.sendBroadcast(broadCastReceiverIntentUpdateSong);    }});