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java - 如何在 recyclerview 适配器类中发送广播？

问题描述

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，一个广播会发送到我的服务类，这样一首歌曲就会开始播放。

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。

标签： javaandroidbroadcastreceiverandroid-recyclerview

解决方案

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);
    }
});

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