Question

这是我的代码：

Places.initialize(context!!, getString(R.string.google_api_key))
        val autocompleteFragment : AutocompleteSupportFragment = fragmentManager?.findFragmentById(R.id.autocomplete_fragment) as AutocompleteSupportFragment
        autocompleteFragment.setCountry("NO")
        autocompleteFragment.setPlaceFields(Arrays.asList(Place.Field.ID, Place.Field.NAME, Place.Field.LAT_LNG, Place.Field.ADDRESS, Place.Field.ADDRESS_COMPONENTS))

        autocompleteFragment.setOnPlaceSelectedListener(object : PlaceSelectionListener {
            override fun onPlaceSelected(place: Place) {
                onPlaceSelectedOverride(place)
                Log.d("myTag", place.address + " - " + place.addressComponents + " - " + place.latLng)
            }

            override fun onError(status: Status) {
                throw RuntimeException()
            }
        })

问题是fragmentManager。以前，代码被放置在mainActivity的onCreate（）内部，并且代码具有这种区别。

val autocompleteFragment : AutocompleteSupportFragment = supportFragmentManager.findFragmentById(R.id.autocomplete_fragment) as AutocompleteSupportFragment

但是在将代码移至另一个片段时，出现了各种问题。 fragmentManager似乎为空。什么是fragmentManager，如何使此代码在片段中起作用？

Answer 1

不确定是否要使用嵌套片段，但如果是这样，则可以尝试使用childFragmentManager。

Answer 2

尝试一下：

val autocompleteFragment : AutocompleteSupportFragment = activity!!supportFragmentManager.findFragmentById(R.id.autocomplete_fragment) as AutocompleteSupportFragment

Answer 3

尝试使用childFragmentManager

val autocompleteFragment : AutocompleteSupportFragment = childFragmentManager.findFragmentById(R.id.autocomplete_fragment) as AutocompleteSupportFragment

Kotlin：片段内的FragmentManager变为null

3 个答案: