java.lang.IllegalStateException : android.accessibilityservice.AccessibilityService.getSystemService(AccessibilityService.java:1602)

Question

我在应用程序中使用辅助功能服务向用户读出自定义文本。 这是我的服务类别:

class GlobalAccessibilityService: AccessibilityService() {
    override fun onInterrupt() {
        Log.i("Accessibility","onInterrupt()")
    }

    override fun onAccessibilityEvent(event: AccessibilityEvent?) {
        Log.i("Accessibility","onAccessibilityEvent() & Even is: "+event.toString())
    }
}

我已经在 Manifest 的 Service 标签下声明了它，并且也有相应的 xml 文件。

这就是我在 Activity 类中调用服务的方式:

     var mService = GlobalAccessibilityService()

       var manager: AccessibilityManager = mService.getSystemService(Context.ACCESSIBILITY_SERVICE) 

                    if (manager.isEnabled){
                        var event: AccessibilityEvent = AccessibilityEvent.obtain()
                        event.eventType = AccessibilityEvent.TYPE_ANNOUNCEMENT
                        event.text.add("This is a test for Accessibility Service Announcement")
                        manager.sendAccessibilityEvent(event)
                    }

但是，我收到以下错误:

     java.lang.IllegalStateException: System services not available to Activities before onCreate()
            at android.accessibilityservice.AccessibilityService.getSystemService(AccessibilityService.java:1602)

请求帮助! 谢谢。

Answer 1

看起来您正在调用下面编写的 onCreate() 方法之前的内容。 您在哪里调用以下代码？ :

var mService = GlobalAccessibilityService()

   var manager: AccessibilityManager = mService.getSystemService(Context.ACCESSIBILITY_SERVICE) 

                if (manager.isEnabled){
                    var event: AccessibilityEvent = AccessibilityEvent.obtain()
                    event.eventType = AccessibilityEvent.TYPE_ANNOUNCEMENT
                    event.text.add("This is a test for Accessibility Service Announcement")
                    manager.sendAccessibilityEvent(event)
                }