我正在开发xamarin跨平台应用程序。 我需要在登录确认页面上通过SMS自动获得激活码。如果我在MainActivity中实例化SmsReceiver，则此answer可以使用，但是如何仅在登录确认页面上实例化SmsReceiver类呢？ SMS激活仅在一页上使用一次，我不希望它在我的应用程序的生命期内一直处于激活状态。这将是浪费。 我希望我的应用仅在登录确认页面处于活动状态时才读取传入消息。我该怎么办？
答案 0 :(得分：0)
如果您不希望您的<div class="x">
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Enabled=false稍后在您要收听的活动上，您需要致电
[BroadcastReceiver(Enabled = false, Label = "SMS Receiver")]
[IntentFilter(new string[] { "android.provider.Telephony.SMS_RECEIVED", Intent.CategoryDefault })]
public class SmsReceiver : BroadcastReceiver
{
// Code omitted for simplicity
....
}
传递RegisterReceiver()和BroadcastReceiver的实例。
类似：
IntentFilter如您所见，当我不再需要/不想再听时，我也在注销。
这是通过以下方法完成的：
[Activity(Label = "MainActivity", MainLauncher = true, Icon = "@mipmap/icon")]
public class MainActivity: Activity
{
private SmsReceiver _smsReceiver;
protected override void OnCreate(Bundle savedInstanceState)
{
base.OnCreate(savedInstanceState);
_smsReceiver = new SmsReceiver()
}
protected override OnResume()
{
base.OnResume();
RegisterReceiver(_smsReceiver, new IntentFilter("android.provider.Telephony.SMS_RECEIVED"));
}
protected override OnPause()
{
UnregisterReceiver(_smsReceiver);
base.OnPause();
}
}
希望这会有所帮助。