在Fragment Android中使用GoogleApiClient

Question

我试图将Google地图加载到片段中.我不知道这三行应该是什么......(三行注释"问题!").

大多数例子在括号中使用"this".我知道这是一个片段,而不是一个活动,所以我用"getActivity()"代替.但是,如果我将所有三行更改为getActivity(),它也不起作用.请帮忙!提前致谢!

public class MapFragment extends Fragment implements OnMapReadyCallback,GoogleApiClient.ConnectionCallbacks,
        GoogleApiClient.OnConnectionFailedListener,com.google.android.gms.location.LocationListener {
private static final String TAG = "***MapFragment***";
private final int PERMISSION_CODE = 1;
private GoogleApiClient myGoogleApiClient;
private GoogleMap myMap;
private Location curLocation;

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
        Bundle savedInstanceState) {
    // Inflate the layout for this fragment
    return inflater.inflate(R.layout.fragment_target, container, false);

// create api client
if (myGoogleApiClient == null) {
    myGoogleApiClient = new GoogleApiClient.Builder(getActivity())  // problem!
            .addConnectionCallbacks(this)   // problem!
            .addOnConnectionFailedListener(this)  // problem!
            .addApi(LocationServices.API)
            .build();
}

Answer 1

这里需要上下文,你可以使用getActivity()

new GoogleApiClient.Builder(getActivity())  // problem!

下面两个方法需要回调,所以你的片段必须实现ConnectionCallbacks,OnConnectionFailedListener监听器.

.addConnectionCallbacks(this)   // problem!
.addOnConnectionFailedListener(this)  // problem!

说明

• .addConnectionCallbacks方法需要ConnectionCallbacks
• .addOnConnectionFailedListener方法需要OnConnectionFailedListener

你已经实现了它们

public class MapFragment extends Fragment implements OnMapReadyCallback,
GoogleApiClient.ConnectionCallbacks,
GoogleApiClient.OnConnectionFailedListener,
com.google.android.gms.location.LocationListener {
    ...
}

所以,'this'在这里指的是你的MapFragment类.当你在上面的方法中传递'this'时,他们会使用他们的回调.