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);

    }

});