将通知设置为在某个用户事件时触发

Posted 2023-04-18

【中文标题】将通知设置为在某个用户事件时触发

【英文标题】：setting the Notification to trigger at a certain user event

【发布时间】：2021-10-13 11:11:45

【问题描述】：

所以我正在创建这个轮播应用程序并且我正在处理通知。我能够创建通知并在片段开始时弹出通知，但我想做的是让通知每 20 次左右滑动弹出一次。

这是通知的代码

片段

class MainFragment: Fragment() 

//    private lateinit var manager: RecyclerView.LayoutManager
    private lateinit var viewPager: ViewPager2
    private var counter: Int = 0
    private var pageChangeCallback: ViewPager2.OnPageChangeCallback? = null


    override fun onCreateView(
        inflater: LayoutInflater,
        container: ViewGroup?,
        savedInstanceState: Bundle?
    ): View? 
        val binding: MainFragmentBinding = DataBindingUtil.inflate(
            inflater,
            R.layout.main_fragment,
            container, false)

        viewPager = binding.imageSlider


        val data: MutableList<CarouselItem> = ArrayList()
        data.add(CarouselItem(1, bcw_65, "First"))
        data.add(CarouselItem(2, bcw_66, "Second"))
        data.add(CarouselItem(3, bcw_67, "Third"))
        data.add(CarouselItem(4, bcw_68, "Fourth"))
        data.add(CarouselItem(5, bcw_69, "Fifth"))
        data.add(CarouselItem(6, bcw_70, "Sixth"))
        data.add(CarouselItem(2, bcw_71, "Seventh"))

        viewPager.adapter = CarouselItemAdapter(data, viewPager)

        viewPager.clipToPadding = false
        viewPager.clipChildren = false
        viewPager.offscreenPageLimit = 3
        viewPager.getChildAt(0).overScrollMode = RecyclerView.OVER_SCROLL_NEVER

        val compositePageTransformer = CompositePageTransformer()
        compositePageTransformer.addTransformer(MarginPageTransformer(30))
        compositePageTransformer.addTransformer  page, position ->
            val r = 1 - abs(position)
            page.scaleY = 0.85f + r * 0.25f
        

        viewPager.setPageTransformer(compositePageTransformer)


        //Used to count the number of swipes bing called
        viewPager.registerOnPageChangeCallback(object : ViewPager2.OnPageChangeCallback() 
            override fun onPageSelected(position: Int) 
                counter++
                binding.counterView.text = counter.toString()
            
        .also  pageChangeCallback = it )

        createChannel(
            getString(R.string.carousel_notification_id),
            getString(R.string.app_name)

        )

            val notificationManager = ContextCompat.getSystemService(
                requireContext(),
                NotificationManager::class.java,
            ) as NotificationManager

            notificationManager.sendNotification(
                requireContext().getText(R.string.swipe_description).toString(), requireContext()
            )




        return binding.root
    

    //Needed to destroy the pageChangeCallback
    override fun onDestroyView() 
        super.onDestroyView()
        viewPager.unregisterOnPageChangeCallback(pageChangeCallback!!)
        pageChangeCallback = null
    

    private fun createChannel (channelID: String, channelName: String)
        if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) 
            val notificationChannel = NotificationChannel(
                channelID,
                channelName,
                NotificationManager.IMPORTANCE_HIGH
            )

            notificationChannel.enableLights(true)
            notificationChannel.lightColor = Color.WHITE
            notificationChannel.enableVibration(true)
            notificationChannel.description = getString(R.string.swipe_description)

            val notificationManager = requireActivity().getSystemService(
                NotificationManager::class.java
            )

            notificationManager.createNotificationChannel(notificationChannel)
        
    

通知实用程序

private val NOTIFICATION_ID = 0



fun NotificationManager.sendNotification(messageBody: String, applicationContext: Context) 

    val builder = NotificationCompat.Builder(
        applicationContext,
        applicationContext.getString(R.string.carousel_notification_id)
    )

        .setSmallIcon(R.drawable.with_outline_6)
        .setContentTitle(applicationContext.getString(R.string.app_name))
        .setContentText(messageBody)


    notify(NOTIFICATION_ID, builder.build())

我知道可能有一个我现在看不到的简单解决方案。任何帮助表示赞赏

【问题讨论】：

***.com/questions/35500049/…

【参考方案1】：

我知道怎么做。在 Viewpager.registerOnPageChangeCallback 调用之前，我必须首先向上移动频道通知以及通知管理器。这样我就可以使用通知实例将通知设置为在特定时间出现。这绝对是一个 if 语句，但是将前两个部分向上移动是需要发生的事情。然后使用模块操作让通知显示每 20 次滑动。