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中点击一首歌时，广播将发送到我的服务类，以便开始播放歌曲。

sendBroadcast无法解析，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一种正确的方法，或者是否有更好的方法在适配器中发送广播，因为我读到某处广播接收器不属于适配器类。

Answer 1

根本原因：sendBroadcast是Context类的一种方法，因为你在Adapter类中调用它，这就是为什么编译器显示错误“sendBroadcast无法解析”。

解决方案：从视图实例获取上下文，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);
    }
});