android - 有没有办法在android中显示一个全局对话框？

Question

我需要在 Android 应用程序上显示并维护一个对话框，该对话框会在一段时间后(例如:30 秒)消失。但是我遇到了一些困难:

1. 如何记录主机(一直处于 Activity 状态)被销毁或正在完成时的显示时间？

2. 如果需要，如何在其他主机恢复时重新显示对话框？

我用下面的代码试了一下，还是不行

// dialog that I want to show.
class BusinessBroadcastDialog(activity: Activity, private val tag: String) : AlertDialog(activity)

object GlobalShowableManager {

    fun show(duration: Int) {
        // ActivityRecorder.get() will return the activity which is on the top of task.
        val activity = ActivityRecorder.get()
        if (activity?.isActivityExist() == true) {
            val tag = "${activity.javaClass.simpleName}#BusinessBroadcastDialog#$duration"
            val dialog = BusinessBroadcastDialog(activity, tag).apply {
                ownerActivity = activity
            }
            dialog.show()
        } else {
            Log.i(TAG, "no exist activity to show global dialog, break.")
        }
    }

    fun resumeToShow() {
        // will be called when other host resumed.
        // get last BusinessBroadcastDialog showing time mark it as t. 
        // if t >= duration then do nothing, 
        // else let t = t - duration and show dialog. dialog will disappear after t seconds.
    }
}

是否有任何(更好的)方式在 android 中显示全局对话框？感谢您的观看和回答:)

Answer 1

实现全局对话框的最简单方法是使用一个 Activity 和多个 fragment 架构，然后每个 fragment 都是新屏幕，您可以使用 Activity 控制对话框。

根据您给出的示例，创建一个私有(private)静态变量以节省时间并在显示对话框时更新计时器，并且在 Activity 的 onResume() 中您可以调用 resumeToShow() 并检查时间并根据需要显示对话框