作为开发人员，您知道用户参与对于您的应用程序的成功至关重要。但是，您如何让用户回来？一种简单的解决方案是实施每周通知，以提醒他们定期使用您的应用程序。在这篇博客文章中，我将介绍使用Android的AlarmManager和日历类为您的应用程序设置每周通知的过程。无论您是构建生产力应用程序，健身追踪器还是冥想指南，这些通知都可以帮助您的用户保持正轨并实现目标。
这是您设置预定的每周通知（每个星期一1213pm）时发生的情况。
这篇文章将涵盖以下
- 创建即时通知
- 创建每周通知（如果用户不重新输入应用程序，请勿重复）
- 创建经常性通知（即使用户不重新输入应用程序，重复也可以重复）
- 造型通知
创建即时通知
，对于每条通知，我们需要设置以下内容通知管理器，频道（ID，名称和重要性），通知构建器（您在其中添加了通知详细信息），最后在管理器上与构建器一起在经理上拨打.notify()，以显示通知。
fun triggerImmediateNotification(context: Context) {
val notificationManager = context.getSystemService(NOTIFICATION_SERVICE) as NotificationManager
// create notification channel
val channelId = "my_channel_id"
val channelName = "My Channel"
val importance = NotificationManager.IMPORTANCE_HIGH
val channel = NotificationChannel(channelId, channelName, importance)
notificationManager.createNotificationChannel(channel)
// build notification (style it here)
val notificationBuilder = NotificationCompat.Builder(context, channelId)
.setSmallIcon(R.drawable.ic_notifications)
.setContentTitle("My Notification Title")
.setContentText("This is an immediate notification.")
.setPriority(NotificationCompat.PRIORITY_HIGH)
.setAutoCancel(true)
// set it to notify immediately
val notificationId = 1
notificationManager.notify(notificationId, notificationBuilder.build())
}
创建预定的每周通知
现在我们都在这里。我们如何设置每周通知？我们将转向以下代码的主要目的，这意味着该代码每次用户输入应用程序
时都会运行。安排通知
您想显示通知的星期几和时间？我们不必将其存储在偏好中，就好像它在同一周内始终设置为本周星期日。
// sunday 12pm in the afternoon
val calendar = Calendar.getInstance()
calendar.set(Calendar.DAY_OF_WEEK, Calendar.SUNDAY) // Sunday
calendar.set(Calendar.HOUR_OF_DAY, 12) // 12pm
calendar.set(Calendar.MINUTE, 0)
calendar.set(Calendar.SECOND, 0)
然后，我们需要检查计划的时间是否过去了。当用户收到通知后再次打开应用程序时，会发生这种情况，我们将希望将日历日重置为下一周。
// Check if the scheduled time is in the past, if it is, add a week
if (calendar.timeInMillis < System.currentTimeMillis()) {
calendar.add(Calendar.WEEK_OF_YEAR, 1)
}
接下来，我们将设置一个意图，该意图将发送到NotificationReciever类，我们将在以后进行
val notificationIntent = Intent(this, NotificationReceiver::class.java)
notificationIntent.putExtra("notificationId", 1)
notificationIntent.putExtra("message", "Time to kick back, relax, and focus on your well-being. Don't forget to use our app to track your progress and goals. Let's make this week amazing together!")
notificationIntent.putExtra("title", "Self-Care Sunday!")
val pendingIntent = PendingIntent.getBroadcast(
applicationContext,
0,
notificationIntent,
PendingIntent.FLAG_UPDATE_CURRENT or PendingIntent.FLAG_MUTABLE)
我们还需要设置警报管理器以在时间到来时推动意图。
val alarmManager = getSystemService(ALARM_SERVICE) as AlarmManager
alarmManager.setExact(AlarmManager.RTC_WAKEUP, calendar.timeInMillis, pendingIntent) // will not repeat until user enters app again
响应警报和通知：NotificationReciever类
现在让我们处理我们最初计划的意图
class NotificationReceiver : BroadcastReceiver() {
// creates notification when it is time
override fun onReceive(context: Context, intent: Intent) {
val notificationId = intent.getIntExtra("notificationId", 0)
val message = intent.getStringExtra("message")
val title = intent.getStringExtra("title")
val notificationManager = context.getSystemService(NOTIFICATION_SERVICE) as NotificationManager
val notificationBuilder = NotificationCompat.Builder(context, "my_channel_id")
.setSmallIcon(R.drawable.ic_notifications)
.setContentTitle(title)
.setContentText(message)
.setPriority(NotificationCompat.PRIORITY_HIGH)
.setAutoCancel(true) // styling the notification
notificationManager.notify(notificationId, notificationBuilder.build())
}
}
创建经常性通知
我们将首先创建一个函数以根据日历安排通知。
private fun scheduleRecurringNotification(calendar: Calendar, title: Int, message: Int){
// set recurring every 2 days
val notificationIntent = Intent(this, NotificationReceiver::class.java)
notificationIntent.putExtra("notificationId", 2)
notificationIntent.putExtra("title", applicationContext.getString(title))
notificationIntent.putExtra("message", applicationContext.getString(message))
val pendingIntent = PendingIntent.getBroadcast(
applicationContext,
0,
notificationIntent,
PendingIntent.FLAG_IMMUTABLE or PendingIntent.FLAG_UPDATE_CURRENT
)
val alarmManager = getSystemService(ALARM_SERVICE) as AlarmManager
val interval = 2 * 24 * 60 * 60 * 1000 // interval in milliseconds
// val interval = 60000 // for every minute during testing
alarmManager.
setRepeating(
AlarmManager.RTC_WAKEUP,
calendar.timeInMillis,
interval.toLong(),
pendingIntent
) // repeating alarm (repeats every 2 days based on interval
}
然后，我们将使用该函数来安排像此这样的通知
fun scheduleEvery2DayNotification() {
// will be reset when user uses the app, (if daily user, wont see notification)
val calendar = Calendar.getInstance()
calendar.set(Calendar.HOUR_OF_DAY, 21)
calendar.set(Calendar.MINUTE, 0)
calendar.set(Calendar.SECOND, 0)
scheduleRecurringNotification(calendar, R.string.day2_notification_title , R.string.day2_notification_text)
}
样式通知
正如我们前面提到的，我们还将使用通知构建器对通知进行样式。
我将介绍一些常见的自定义。现在让我们尝试做这样的通知。
val notificationBuilder = NotificationCompat.Builder(context, "my_channel_id")
.setSmallIcon(R.drawable.icon) // small icon
.setContentTitle(title) // content title
.setContentText(message) // content text (this shows when the notification is not expanded)
.setPriority(NotificationCompat.PRIORITY_HIGH)
.setAutoCancel(true)
.setLargeIcon(BitmapFactory.decodeResource(context.resources, R.drawable.icon)) // you can also set a big icon on the right like how Gmail does it
.setStyle(NotificationCompat.BigTextStyle()
.bigText(message)) // this is the text shown when the notification is expanded
.addAction(R.drawable.ic_notifications, "Write", pendingIntent) // adding actions (buttons)
.setDefaults(NotificationCompat.DEFAULT_ALL)
更多关于造型通知的信息：https://developer.android.com/develop/ui/views/notifications/expanded
感谢您的阅读，发表评论，让我知道您的想法！希望有助于在Android中创建通知！ ：）