android - Xamarin/Android 应用程序 : Broadcast receiver not working

Question

我试图在拨出电话时显示通知，但它不起作用(未显示任何内容)。我单独测试了通知，它工作正常，但我很确定我在 BroadcastReceiver 中做错了什么。提前致谢!

主要 Activity :

[Activity(Label = "ExamProject", MainLauncher = true, Icon = "@drawable/icon")]
public class MainActivity : Activity
{
    protected override void OnCreate(Bundle bundle)
    {
        MyBroadcastRecieverClass reciever;
        base.OnCreate(bundle);
        // Set our view from the "main" layout resource
        SetContentView(Resource.Layout.Main);
        reciever = new MyBroadcastRecieverClass();
        RegisterReceiver(reciever, new IntentFilter("android.intent.action.NEW_OUTGOING_CALL"));

广播接收者类:

namespace App3
{
[BroadcastReceiver(Enabled = true, Exported = true)]
[IntentFilter(new[] { Android.Content.Intent.ActionNewOutgoingCall })]
public class MyBroadcastRecieverClass: BroadcastReceiver
{
    public override void OnReceive(Context context, Intent intent)
    {
        // Do stuff here.

        //String value = intent.GetStringExtra("key");

        Notification.Builder builder = new Notification.Builder(Application.Context)
              .SetContentTitle("Test Title")
              .SetContentText("test content")
              .SetSmallIcon(Resource.Drawable.Icon)
              .SetPriority(100)
              .SetDefaults(NotificationDefaults.Sound)
              .SetVisibility(NotificationVisibility.Public)
              .SetCategory(Notification.CategoryAlarm);


        //build the notification
        Notification test = builder.Build();

        // Get the notification manager:
        NotificationManager notificationManager =
            context.GetSystemService(Context.NotificationService) as NotificationManager;

        // Publish the notification:
        const int notificationId = 0;//should be changed to generate a uniqe value
        notificationManager.Notify(notificationId, test);
    }
}

Answer 1

我发现了错误，这里有语法问题:

RegisterReceiver(reciever, new IntentFilter("android.intent.action.NEW_OUTGOING_CALL"));

正确的代码:

public class MainActivity : Activity
{
    protected override void OnCreate(Bundle bundle)
    {
        MyBroadcastRecieverClass reciever;
        base.OnCreate(bundle);
        // Set our view from the "main" layout resource
        SetContentView(Resource.Layout.Main);
        reciever = new MyBroadcastRecieverClass();

        IntentFilter myIntentFilter = new IntentFilter("android.intent.action.NEW_OUTGOING_CALL");
        RegisterReceiver(reciever, myIntentFilter);

        Button settingsButton = FindViewById<Button>(Resource.Id.settingsButton);