Kotlin与Android中的地图 [英] Kotlin with Map in Android
本文介绍了Kotlin与Android中的地图的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
override fun onCreateView(inflater: LayoutInflater?, container: ViewGroup?, savedInstanceState: Bundle?): View {
var view: View = inflater?.inflate(R.layout.map_fragment, null)!!
var mapFragment : SupportMapFragment?=null
mapFragment= fragmentManager.findFragmentById(R.id.map) as SupportMapFragment
mapFragment.getMapAsync(this)
return view
}
Logcat:
FATAL EXCEPTION: main
kotlin.TypeCastException: null cannot be cast to non-null type
com.google.android.gms.maps.SupportMapFragment
at example.com.kotlinexamplebydimple.Mapfragment.onCreateView(Mapfragment.kt:36)
在此行上显示错误:
mapFragment= fragmentManager.findFragmentById(R.id.map) as SupportMapFragment
推荐答案
您已声明mapFragment可为空，因此您必须对其进行处理:
You declared mapFragment to be nullable so you have to deal with it:
var mapFragment : SupportMapFragment?=null
mapFragment = fragmentManager.findFragmentById(R.id.map) as SupportMapFragment?
mapFragment?.getMapAsync(this)
这篇关于Kotlin与Android中的地图的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
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