开启前台服务

我就是想做个笔记而已，给自己看看而已

第一步：
面向Android 9（API级别28）或更高版本并使用前台服务的应用必须请求 FOREGROUND_SERVICE 权限

so先来个权限
<uses-permission android:name="android.permission.FOREGROUND_SERVICE"/>

然后启动一个前台服务

val pendingIntent: PendingIntent =
Intent(this, ExampleActivity::class.java).let { notificationIntent ->
PendingIntent.getActivity(this, 0, notificationIntent, 0)
}

val notification: Notification = Notification.Builder(this, CHANNEL_DEFAULT_IMPORTANCE)
.setContentTitle(getText(R.string.notification_title))
.setContentText(getText(R.string.notification_message))
.setSmallIcon(R.drawable.icon)
.setContentIntent(pendingIntent)
.setTicker(getText(R.string.ticker_text))
.build()

// Notification ID cannot be 0.
startForeground(ONGOING_NOTIFICATION_ID, notification)

最后你发现，死活就是tm的没开起来，还崩溃了，哈哈啊啊啊哈哈

然后再看看，发现还需要tn的什么通道，先不管了，先上代码：

 val notificationManager: NotificationManager =
        getSystemService(Context.NOTIFICATION_SERVICE) as NotificationManager
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
        val name = getString(R.string.app_name)
        val descriptionText = getString(R.string.app_name)
        val importance = NotificationManager.IMPORTANCE_DEFAULT
        val channel = NotificationChannel("1232155654686578343", name, importance).apply {
            description = descriptionText
        }
        // Register the channel with the system

        notificationManager.createNotificationChannel(channel)
    }

就是这个小混蛋创建了什么通道
然后调用
notificationManager.notify(1, notification)
好了差不多了
完整代码就是这样的：
@RequiresApi(Build.VERSION_CODES.O)
fun createNotificationChannel() {
val notificationManager: NotificationManager =
getSystemService(Context.NOTIFICATION_SERVICE) as NotificationManager
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
val name = getString(R.string.app_name)
val descriptionText = getString(R.string.app_name)
val importance = NotificationManager.IMPORTANCE_DEFAULT
val channel = NotificationChannel("1232155654686578343", name, importance).apply {
description = descriptionText
}
// Register the channel with the system

        notificationManager.createNotificationChannel(channel)
    }
    val pendingIntent: PendingIntent =
        Intent(this, MainActivity::class.java).let { notificationIntent ->
            PendingIntent.getActivity(this, 0, notificationIntent, 0)
        }

    val notification: Notification = Notification.Builder(baseContext, "1232155654686578343")
        .setContentTitle(getText(R.string.app_name))
        .setContentText(getText(R.string.app_name))
        .setSmallIcon(R.drawable.ic_back)
        .setContentIntent(pendingIntent)
        .setTicker(getText(R.string.app_name))
        .build()
    startForeground(123, notification)
    notificationManager.notify(1, notification)
}

然后发现你的前台服务就这么简单愉快的启动起来了，至于能不能保活我就不懂了，等待验证了
反正搞了这么多都是为了保活

注意：Notification.Builder(baseContext, "1232155654686578343")和NotificationChannel("1232155654686578343", name, importance)
这两个是要一样的

其实不懂的看官网，比网上哪些乱七八糟的靠谱多了，百度百度 .... 摆渡摆渡..... 全是一个抄一个.....