Google Places API AutocompleteSupportFragment空指针异常 [英] Google Places API AutocompleteSupportFragment Null pointer Exception
问题描述
我正在使用Google Places API来获取自动完成支持片段,以获取带有位置建议的搜索栏.我按照这里给出的教程 地方信息自动完成
I am using the Google Places API to get an autocomplete support fragment to get a search bar with location suggestions. I followed the tutorial given here Places Autocomplete
这是XML代码
<fragment
android:id="@+id/autoCompleteFragment"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:name="com.google.android.libraries.places.widget.AutocompleteSupportFragment" />
这是Java代码
// Initialize the AutocompleteSupportFragment.
AutocompleteSupportFragment autocompleteFragment = (AutocompleteSupportFragment) getActivity().getSupportFragmentManager().findFragmentById(R.id.autoCompleteFragment);
// Specify the types of place data to return.
autocompleteFragment.setPlaceFields(Arrays.asList(Place.Field.ID, Place.Field.NAME));
// Set up a PlaceSelectionListener to handle the response.
autocompleteFragment.setOnPlaceSelectedListener(new PlaceSelectionListener() {
@Override
public void onPlaceSelected(Place place) {
// TODO: Get info about the selected place.
Log.i(TAG, "Place: " + place.getName() + ", " + place.getId());
}
@Override
public void onError(Status status) {
// TODO: Handle the error.
Log.i(TAG, "An error occurred: " + status);
}
});
空指针异常出现在此行上
The null pointer exception comes on this line
autocompleteFragment.setPlaceFields(Arrays.asList(Place.Field.ID, Place.Field.NAME));
其中说setPlaceFields
不能在空引用上调用.
Which says that setPlaceFields
cannot be called on a null reference.
推荐答案
First of all, you have to initialize Places (reference here):
// Add an import statement for the client library.
import com.google.android.libraries.places.api.Places;
// Initialize Places.
Places.initialize(getApplicationContext(), apiKey);
如果要在活动中使用AutocompleteSupportFragment,则可以通过以下方式获取它:
If you want to use the AutocompleteSupportFragment inside an Activity, you can get it in this way:
AutocompleteSupportFragment autocompleteFragment = (AutocompleteSupportFragment)
getSupportFragmentManager().findFragmentById(R.id.autoCompleteFragment);
如果要在Fragment中使用AutocompleteSupportFragment,则可以通过以下方式获取它:
If you want to use the AutocompleteSupportFragment inside a Fragment, you can get it in this way:
AutocompleteSupportFragment autocompleteFragment = (AutocompleteSupportFragment)
getChildFragmentManager().findFragmentById(R.id.autoCompleteFragment);
这篇关于Google Places API AutocompleteSupportFragment空指针异常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!