“从 PlaceSelectionListener 派生的匿名类”类必须声明为抽象或实现抽象方法

Question

我想使用 Place Autocomplete 所以我阅读了谷歌文档 我使用了“嵌入 AutocompleteSupportFragment”选项 但我输入的完全一样，是谷歌写的，但是有这样的错误

1. 类“派生自 PlaceSelectionListener 的匿名类”必须声明为抽象或在“PlaceSelectionListener”中实现抽象方法“onPlaceSelected(Place)”
2. 方法不会覆盖其超类中的方法

我确实覆盖了方法“onPlaceSelected”，但是当我输入代码时，代码变为灰色并在下面的 PlaceSelectionListener 处创建红线..

我不知道为什么，请帮忙...

代码在这里

public class FinalTest extends FragmentActivity {
    private static int AUTOCOMPLETE_REQUEST_CODE = 1;
    private static final String TAG = "FinalTest";
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_final_test);

        Places.initialize(getApplicationContext(), "my_api_key");
        PlacesClient placesClient = Places.createClient(this);

        // Initialize the AutocompleteSupportFragment.
        AutocompleteSupportFragment autocompleteFragment = (AutocompleteSupportFragment)
                getSupportFragmentManager().findFragmentById(R.id.autocomplete_fragment);

        // Specify the types of place data to return.
        autocompleteFragment.setTypeFilter(TypeFilter.ADDRESS);

        autocompleteFragment.setLocationBias(RectangularBounds.newInstance(
                new LatLng(-33.880490, 151.184363),
                new LatLng(-33.858754, 151.229596)));
        autocompleteFragment.setCountries("IN");
        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);
            }
        });
    }
}

Answer 1

你没有显示你的导入，但我猜你有这个导入：

导入 com.google.android.gms.location.places.ui.PlaceSelectionListener；

改成：

进口 com.google.android.libraries.places.widget.listener.PlaceSelectionListener;