Question

如何在Kotlin中使用注册并在Android中创建广播接收器。任何建议.... 在Java中，您可以通过将其声明为广播接收器来创建它。但是在Kotlin中没有广播接收器功能......如果它在那里，那么我无法找到它或如何使用它。

Answer 1

you can do it in the following way

Create a broadcast receiver object in your activity class

 val broadCastReceiver = object : BroadcastReceiver() {
        override fun onReceive(contxt: Context?, intent: Intent?) {

            when (intent?.action) {
                BROADCAST_DEFAULT_ALBUM_CHANGED -> handleAlbumChanged()

                BROADCAST_CHANGE_TYPE_CHANGED -> handleChangeTypeChanged()
            }
           }
          }

Register broadcast receiver in onCreate() function of your activity

 LocalBroadcastManager.getInstance(this)
                    .registerReceiver(broadCastReceiver, IntentFilter(BROADCAST_DEFAULT_ALBUM_CHANGED))

unregister it in ondestroy function of your activity

LocalBroadcastManager.getInstance(this)
                .unregisterReceiver(broadCastReceiver)

Answer 2

Kotlin中的匿名类语法是这样的：

val receiver = object : BroadcastReceiver() {
    override fun onReceive(context: Context, intent: Intent) {

    }
}

Answer 3

我创建了一个BroadcastReceiver Kotlin extension，您可以在任何地方复制/粘贴。它没有比已经提到的更多，但它减少了一些样板。

使用此扩展程序，您应该注册/取消注册，如下所示：

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广播接收器在kotlin

3 个答案: