如何将 registerNetworkCallback 与 PendingIntent 一起使用？

Question

CONNECTIVITY_ACTION was deprecated in API level 28 and Google advices to use registerNetworkCallback(NetworkRequest, PendingIntent).

I tried registerNetworkCallback with ConnectivityManager.NetworkCallback and it works, but I want to use PendingIntent.

What confuse me is the description of public void registerNetworkCallback(NetworkRequest request, PendingIntent operation) :

The operation is an Intent broadcast that goes to a broadcast receiver that you registered with Context#registerReceiver or through the tag in an AndroidManifest.xml file

Context#registerReceiver accepts IntentFilter as an argument, while PendingIntent.getBroadcast requires Intent .

Here is my code, and NetworkStateReceiver::onReceive is not called.

private fun getNetworkIntent(): PendingIntent {
    if (networkPendingIntent != null) {
        return networkPendingIntent!!
    }

    val intent = Intent(this, NetworkStateReceiver::class.java)
    networkPendingIntent = PendingIntent.getBroadcast(
        this, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT)

    return networkPendingIntent!!
}

private fun getNetworkRequest(): NetworkRequest {
    return NetworkRequest.Builder()
        .addTransportType(NetworkCapabilities.TRANSPORT_CELLULAR)
        .addTransportType(NetworkCapabilities.TRANSPORT_WIFI)
        .build()
}

private fun registerNetworkUpdates() {
    var cm =
        applicationContext.getSystemService(Context.CONNECTIVITY_SERVICE) as ConnectivityManager?
    cm?.registerNetworkCallback(getNetworkRequest(), getNetworkIntent())
}

Why? Should I also call Context#registerReceiver ? But what action should I use with IntentFilter if CONNECTIVITY_ACTION was deprecated?

Answer 1

Finally I made it works. First I need to add the receiver to AndroidManifest.xml

<receiver 
        android:name=".NetworkStateReceiver"
        android:enabled="true"
        android:exported="true" />

Second, NetworkStateReceiver#onReceive is called only once when the connection was offline and becomes available. So every-time I need to send anything when the connection is offline I have to call registerNetworkUpdates .

Third, I have to call unregisterNetworkCallback before calling registerNetworkCallback . If I called registerNetworkCallback twice with the same Intent , NetworkStateReceiver#onReceive was called twice. And I used applicationContext instead of this when creating PendingIntent.getBroadcast .