android - 如何在 Activity 中收听 Geofence BroadcastReceiver？

Question

我关注了Android's tutorial on adding a Geofence with a BroadcastReceiver .

这成功地向我发送了有关地理围栏转换的通知。

但是，我现在还需要在我的 fragment/Activity 中接收广播，以便我可以执行一些 UI 更改。

下面是我当前注册地理围栏广播的代码:

MapFragment.kt

private fun createOnlineGeofence(currentLocation: GeoPoint){
    val geofenceId = "ONLINE_GEOFENCE_ID"
    with(sharedPref.edit()) {
        putString("geofenceId", geofenceId)
        apply()
    }
    /** Create Geofence */
    user.geofence = Geofence.Builder().apply {
        setRequestId(geofenceId)
            setCircularRegion(currentLocation.latitude, currentLocation.longitude, 400f)
            setExpirationDuration(Geofence.NEVER_EXPIRE)
            setTransitionTypes(Geofence.GEOFENCE_TRANSITION_EXIT)
            setNotificationResponsiveness(300000)
    }.build()
    val geofenceRequest = GeofencingRequest.Builder().apply {
        addGeofence(user.geofence)
    }.build()
    val pendingIntent: PendingIntent by lazy {
        val intent = Intent(mContext.applicationContext, GeofenceBroadcastReceiverTesting::class.java)
        intent.putExtra("type", "online")
        intent.putExtra("geofenceId", geofenceId)
        PendingIntent.getBroadcast(mContext, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT)
    }
    Log.d(TAG, "Created online Geofence, geofenceId: ${user.geofence?.requestId}")
    if (ContextCompat.checkSelfPermission(mContext, Manifest.permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_GRANTED) {
        geofencingClient.addGeofences(geofenceRequest, pendingIntent)?.run {
            addOnSuccessListener {
                Log.d(TAG, "Online geofence added")
            }
            addOnFailureListener {
                exception -> Log.d(TAG, "Exception: $exception")
            }
        }
    }
}

如何在我的 Fragment/Activity 中监听 Geofence 转换？

Answer 1

你可以看看这个 solution here使用 LocalBroadcastManager (LBM)。这个想法是告诉 LBM 你想听到某个 IntentFilter 的广播 & 在 Geofence BroadcastReceiver 中，你可以调用 LBM 发送广播以供 Activity 接收。不用说，您必须在 Activity 本身中实现 ​​BroadcastReceiver 才能接受本地广播。