Adding PlaceAutocompleteFragment to fragment throws error

Use getActivity() like this way.

PlaceAutocompleteFragment autocompleteFragment1  = (PlaceAutocompleteFragment)getActivity().getFragmentManager().findFragmentById(R.id.autocomplete_fragment1);

1. Change SupportPlaceAutocompleteFragment instead of PlaceAutocompleteFragment in your layout xml

   fragment 
    android:id="@+id/place_autocomplete_fragment"
    android:name="com.google.android.gms.location.places.ui.SupportPlaceAutocompleteFragment"                          
    android:layout_width="match_parent"                        
    android:layout_height="wrap_content" 
    />

2. Change getChildFragmentManager() instead of getFragmentManager() and use SupportPlaceAutocompleteFragment instead of PlaceAutocompleteFragment in your java file,.

    SupportPlaceAutocompleteFragment autocompleteFragment = (SupportPlaceAutocompleteFragment) getChildFragmentManager().findFragmentById(R.id.place_autocomplete_fragment);
   

Here's the solution in Kotlin. This is specifically for if you want to launch the autocomplete fragment while being in a fragment.

val autocompleteFragment = childFragmentManager.findFragmentById(R.id.autocomplete_support_fragment) as AutocompleteSupportFragment?

<fragment
    android:id="@+id/autocomplete_support_fragment"
    android:name="com.google.android.libraries.places.widget.AutocompleteSupportFragment"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
/>