startActivity 在 fcm 中的 onMessageReceived 内不起作用 [英] startActivity not working inside onMessageReceived in fcm

问题描述

我知道有很多线程在讨论这个问题.我已经尝试了该线程上的几乎所有解决方案，但不幸的是，这在我的情况下不起作用.

I know there are many thread discussing this problem. I have tried almost all of solutions on that threads, but unfortunately that didn't work in my case.

基本上，我想做的是，我想在 onMessageReceived 被调用后立即开始一个活动，而不发出通知.

Basically, what I want to do is, I want to start an activity immediately after onMessageReceived is called without issuing notification.

这是我的代码:

override fun onMessageReceived(p0: RemoteMessage) {
    super.onMessageReceived(p0)
    "new notif".ea()
    val data = p0.data
    val title = data["title"]
    val body = data["body"]
    val type = data["type"]

    if (type == NEW_ORDER) {
        val order = data["data"]!!.fromJsonObject(OrderModel::class.java)
        NewOrderActivity.open(this, order)
    }
...

class NewOrderActivity : BaseActivity() {

    companion object {
        fun open(c: Context, order: OrderModel) = c.startActivity(Intent(c, NewOrderActivity::class.java).apply {
            addFlags(Intent.FLAG_ACTIVITY_NEW_TASK)
            putExtra("order", order.toJsonObject())
        })
    }
...

问题是，如果应用程序在前台，NewOrderActivity 会打开.但是如果应用程序在后台，NewOrderActivity 不会打开.我曾尝试使用 BroadcastReceiver 但这也不起作用.当前 compileSdkVersion 和 targetSdkVersion 设置为 29.我已将其更改为 28 但也不起作用

The problem is, if the app is in foreground, NewOrderActivity is opened. But if the app is in background, NewOrderActivity is not opened. I have tried using BroadcastReceiver but that also does not work. Current compileSdkVersion and targetSdkVersion is set to 29. I have changed it to 28 but also does not work

推荐答案

这是因为用户没有授予 SYSTEM_ALERT_WINDOW 权限.如果有人需要知道如何授予 SYSTEM_ALERT_WINDOW 权限，这里是链接SYSTEM_ALERT_WINDOW - 如何在 Android 6.0 和 targetSdkVersion 23 上自动获得此权限

This is because SYSTEM_ALERT_WINDOW permission is not granted by the user. In case someone needs to know how to grant the SYSTEM_ALERT_WINDOW persmission, here is the link SYSTEM_ALERT_WINDOW - How to get this permission automatically on Android 6.0 and targetSdkVersion 23

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