我尝试自学Android。在我的应用中,我想使用fragment来显示谷歌地图,并且当用户打开我的应用时,我想通过使用GoogleApiClient
获取当前位置。
public class HomeFragment extends Fragment implements GoogleApiClient.ConnectionCallbacks, GoogleApiClient.OnConnectionFailedListener {
public interface comuticateParent {
public void sendMess(String text);
}
private static final String ARG_PARAM1 = "param1";
private static final String ARG_PARAM2 = "param2";
// TODO: Rename and change types of parameters
private String mParam1;
private String mParam2;
public HomeFragment() {
// Required empty public constructor
}
public static HomeFragment newInstance(String param1, String param2) {
HomeFragment fragment = new HomeFragment();
Bundle args = new Bundle();
args.putString(ARG_PARAM1, param1);
args.putString(ARG_PARAM2, param2);
fragment.setArguments(args);
return fragment;
}
comuticateParent callback;
Button btn1;
TextView textView;
MapView mMapView;
GoogleApiClient mGoogleApiClient;
Location mLastLocation;
LocationRequest mLocationRequest;
private GoogleMap googleMap;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if (getArguments() != null) {
mParam1 = getArguments().getString(ARG_PARAM1);
mParam2 = getArguments().getString(ARG_PARAM2);
}
if (mGoogleApiClient == null) {
mGoogleApiClient = new GoogleApiClient.Builder(getActivity())
.addConnectionCallbacks(this)
.addOnConnectionFailedListener(this)
.addApi(LocationServices.API)
.build();
}
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_home, container, false);
mMapView = (MapView) rootView.findViewById(R.id.mapView);
mMapView.onCreate(savedInstanceState);
mMapView.onResume(); // needed to get the map to display immediately
try {
MapsInitializer.initialize(getActivity().getApplicationContext());
} catch (Exception e) {
e.printStackTrace();
}
mMapView.getMapAsync(new OnMapReadyCallback() {
@Override
public void onMapReady(GoogleMap mMap) {
googleMap = mMap;
googleMap.setMyLocationEnabled(true);
mLastLocation = LocationServices.FusedLocationApi.getLastLocation(mGoogleApiClient);
Log.d("onCreateView", Boolean.toString(mGoogleApiClient.isConnected()));
googleMap.animateCamera(CameraUpdateFactory.newLatLngZoom(mylocation, 13));
}
});
return rootView;
}
@Override
public void onStart() {
mGoogleApiClient.connect();
Log.d("ConnectonStart", "Connected ");
Log.d("ONstart", Boolean.toString(mGoogleApiClient.isConnected()));
super.onStart();
}
@Override
public void onStop() {
mGoogleApiClient.disconnect();
super.onStop();
}
@Override
public void onResume() {
mGoogleApiClient.connect();
super.onResume();
mMapView.onResume();
}
@Override
public void onPause() {
super.onPause();
mMapView.onPause();
}
@Override
public void onDestroy() {
super.onDestroy();
mMapView.onDestroy();
}
@Override
public void onLowMemory() {
super.onLowMemory();
mMapView.onLowMemory();
}
@Override
public void onConnected(Bundle bundle) {
Log.d("Connect", "Connected ");
Log.d("onConnected", Boolean.toString(mGoogleApiClient.isConnected()));
}
@Override
public void onConnectionSuspended(int i) {
}
@Override
public void onConnectionFailed(ConnectionResult connectionResult) {
Log.d("Connect", "failed ");
}
@Override
public void onAttach(Context context) {
super.onAttach(context);
Activity activity;
if (context instanceof Activity) {
activity = (Activity) context;
callback = (comuticateParent) getActivity();
}
}
}
问题出在这里: - 在onConnected方法之前,onCreateView方法就已经出现了,因此我无法使用getLastLocation()获取位置信息,因为GoogleApiClient尚未连接。
我在谷歌上搜索了,但是我不知道如何解决。请帮帮我! 对我的英文表达表示抱歉。