设备重启（或类似状态）时不显示本地通知 Android

Question

我有点新，所以我有一个简单的问题，我创建了一个 Xamarin.Android 应用程序，我已经使用带有警报管理器、广播接收器等的本地通知来安排它们，我的问题有一个问题是，当设备重新启动或完全关闭状态并再次打开时，我的预定通知没有显示。我的问题是：

Android 里面有问题吗？ 除此以外 我该如何解决？

希望得到帮助，谢谢

Answer 1

默认情况下，设备关闭时所有警报都会被取消。

https://developer.android.com/training/scheduling/alarms

By default, all alarms are canceled when a device shuts down. To prevent this from happening, you can design your application to automatically restart a repeating alarm if the user reboots the device. This ensures that the AlarmManager will continue doing its task without the user needing to manually restart the alarm.

您需要监控 BOOT_COMPLETE 并重新设置闹钟。

https://developer.android.com/reference/android/Manifest.permission.html#RECEIVE_BOOT_COMPLETED

清单：

<uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED"/>


<receiver android:name=".SampleBootReceiver">
    <intent-filter>
        <action android:name="android.intent.action.BOOT_COMPLETED"></action>
    </intent-filter>
</receiver>

接收者：

class SampleBootReceiver : BroadcastReceiver() {

    override fun onReceive(context: Context, intent: Intent) {
        if (intent.action == "android.intent.action.BOOT_COMPLETED") {
            // Re-set the alarm here.
        }
    }
}