android - 如何从 Fragment 或 Activity 调用挂起函数？

Question

我想请求权限并通过非阻塞函数来完成。因为我需要上下文，所以我不能从 ViewModel 调用它。如何为 fragment 提供默认 UI 范围并像这样调用挂起函数:

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{...}

Answer 1

在文档中 https://developer.android.com/topic/libraries/architecture/coroutines说我可以使用 androidx.lifecycle:lifecycle-runtime-ktx:2.2.0-alpha01 ktx。

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)
    }
 }
}