如何从片段或活动中调用暂停函数？ [英] How to call suspend function from Fragment or Activity?

问题描述

我想请求权限，并通过非阻塞函数进行。因为我需要上下文，所以不能从ViewModel中调用它。如何为碎片和调用暂停函数指定默认的UI作用域：

class MapsFragment : Fragment() {

override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
    super.onViewCreated(view, savedInstanceState)
    mapFragment = childFragmentManager.findFragmentById(R.id.map) as SupportMapFragment?

    launch {
         withContext(Dispatcher.Main){
           checkLocationPermission().await()
        }
    }
 }
}


suspend fun checkLocationPermission():Boolean{...}

推荐答案

文档https://developer.android.com/topic/libraries/architecture/coroutines中说我可以使用androidx.lifecycle:lifecycle-runtime-ktx:2.2.0-alpha01ktx。

class MyFragment: Fragment() {
override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
    super.onViewCreated(view, savedInstanceState)
    viewLifecycleOwner.lifecycleScope.launch {
        val params = TextViewCompat.getTextMetricsParams(textView)
        val precomputedText = withContext(Dispatchers.Default) {
            PrecomputedTextCompat.create(longTextContent, params)
        }
        TextViewCompat.setPrecomputedText(textView, precomputedText)
    }
 }
}

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