问等待Retrofit API更新后再创建Android分片视图

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public class Frag1 extends Fragment  {
    // TODO: Rename parameter arguments, choose names that match
    // the fragment initialization parameters, e.g. ARG_ITEM_NUMBER
    private static final String ARG_PARAM1 = "param1";
    private static final String ARG_PARAM2 = "param2";
    OnHeadlineSelectedListener callback;
    // TODO: Rename and change types of parameters
    private String mParam1;
    private String mParam2;

    private OnFragmentInteractionListener mListener;

    private static final String FINE_LOCATION = Manifest.permission.ACCESS_FINE_LOCATION;
    private static final String COURSE_LOCATION = Manifest.permission.ACCESS_COARSE_LOCATION;
    private static final int LOCATION_PERMISSION_REQUEST_CODE = 1234;
    private Boolean mLocationPermissionsGranted = false;
    private FusedLocationProviderClient mFusedLocationProviderClient;
    public Button sendButton;
    TextView  description, tempTextView, cityNameTextView, humidityTextView, pressureTextView, windSpeedTextView;;
    private WebView MapsView;

    ImageView weatherIcon;

    public Frag1() {
        // Required empty public constructor
    }

    /**
     * Use this factory method to create a new instance of
     * this fragment using the provided parameters.
     *
     * @param param1 Parameter 1.
     * @param param2 Parameter 2.
     * @return A new instance of fragment Frag1.
     */
    // TODO: Rename and change types and number of parameters
    public static Frag1 newInstance(String param1, String param2) {
        Frag1 fragment = new Frag1();
        Bundle args = new Bundle();
        args.putString(ARG_PARAM1, param1);
        args.putString(ARG_PARAM2, param2);
        fragment.setArguments(args);
        return fragment;
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        if (getArguments() != null) {
            mParam1 = getArguments().getString(ARG_PARAM1);
            mParam2 = getArguments().getString(ARG_PARAM2);

        }


    }

    public void setOnHeadlineSelectedListener(OnHeadlineSelectedListener callback) {
        this.callback = callback;
    }
    // This interface can be implemented by the Activity, parent Fragment,
    // or a separate test implementation.
    public interface OnHeadlineSelectedListener {

    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        View v = inflater.inflate(R.layout.fragment_frag1, container, false);
        sendButton = v.findViewById(R.id.sendButton);
        pressureTextView = v.findViewById(R.id.pressureTextView);
        windSpeedTextView = v.findViewById(R.id.windSpeedTextView);
        humidityTextView = v.findViewById(R.id.humidityTextView);
        cityNameTextView = v.findViewById(R.id.cityNameTextView);
        description = v.findViewById(R.id.descriptionTextView);
        tempTextView = v.findViewById(R.id.tempTextView);

        ((MainActivity)getActivity()).getLocationPermission();
        ((MainActivity)getActivity()).getDeviceLocation();

        //final WeatherForcast forcast = retrofit.create(WeatherForcast.class);

        return v;
    }

    // TODO: Rename method, update argument and hook method into UI event
    public void onButtonPressed(Uri uri) {
        if (mListener != null) {
            mListener.onFragmentInteraction(uri);
        }
    }

    @Override
    public void onViewCreated(@NonNull final View view, @Nullable Bundle savedInstanceState) {
        super.onViewCreated(view, savedInstanceState);

        Retrofit retrofit = new Retrofit.Builder()
                .baseUrl("https://api.openweathermap.org")
                .addConverterFactory(JacksonConverterFactory.create())
                .build();
        final WeatherService service = retrofit.create(WeatherService.class);
            Call<WeatherOutputData> callRequest = service.getWeatherInfo(Double.toString(lat), Double.toString(lon), "imperial", "API_ID");

            callRequest.enqueue(new Callback<WeatherOutputData>() {
                @Override
                public void onResponse(Call<WeatherOutputData> call, Response<WeatherOutputData> response) {
                    WeatherOutputData data = response.body();

                    cityNameTextView.setText(data.getName());
                    tempTextView.setText(data.getMain().getTemp() + "°F");
                    description.setText("Clouds: " + data.getWeather().get(0).getDescription());
                    humidityTextView.setText("Humidity: " + data.getMain().getHumidity() + "%");
                    pressureTextView.setText("Pressure: " + data.getMain().getPressure() + "ppi");
                    windSpeedTextView.setText("Wind Speed: " + data.getWind().getSpeed() + " MPH");
                    String icon = data.getWeather().get(0).getIcon();
                    String iconUrl = "http://openweathermap.org/img/w/" + icon + ".png";
                    //Picasso.get().load(iconUrl).into(weatherIcon);
                }

                @Override
                public void onFailure(Call<WeatherOutputData> call, Throwable t) {
                    Log.d("null", t.getMessage());
                }
            });
        }


    @Override
    public void onDetach() {
        super.onDetach();
        mListener = null;
    }

    /**
     * This interface must be implemented by activities that contain this
     * fragment to allow an interaction in this fragment to be communicated
     * to the activity and potentially other fragments contained in that
     * activity.
     * <p>
     * See the Android Training lesson <a href=
     * "http://developer.android.com/training/basics/fragments/communicating.html"
     * >Communicating with Other Fragments</a> for more information.
     */
    public interface OnFragmentInteractionListener {
        // TODO: Update argument type and name
        void onFragmentInteraction(Uri uri);
    }
}

public class MainActivity extends AppCompatActivity implements Frag1.OnHeadlineSelectedListener {
    private static final String FINE_LOCATION = Manifest.permission.ACCESS_FINE_LOCATION;
    private static final String COURSE_LOCATION = Manifest.permission.ACCESS_COARSE_LOCATION;
    private static final int LOCATION_PERMISSION_REQUEST_CODE = 1234;
    private Boolean mLocationPermissionsGranted = false;
    private FusedLocationProviderClient mFusedLocationProviderClient;
    public static double lat, lon;

    public FragmentRefreshListener getFragmentRefreshListener() {
        return fragmentRefreshListener;
    }

    public void setFragmentRefreshListener(FragmentRefreshListener fragmentRefreshListener) {
        this.fragmentRefreshListener = fragmentRefreshListener;
    }

    private FragmentRefreshListener fragmentRefreshListener;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        getLocationPermission();
        getDeviceLocation();

        SectionsPagerAdapter sectionsPagerAdapter = new SectionsPagerAdapter(this, getSupportFragmentManager());
        ViewPager viewPager = findViewById(R.id.view_pager);
        viewPager.setAdapter(sectionsPagerAdapter);
        TabLayout tabs = findViewById(R.id.tabs);
        tabs.setupWithViewPager(viewPager);
        FloatingActionButton fab = findViewById(R.id.fab);



    }
    public void onAttachFragment(Fragment fragment) {
        if (fragment instanceof Frag1) {
            Frag1 headlinesFragment = (Frag1) fragment;
            headlinesFragment.setOnHeadlineSelectedListener(this);
        }
    }
    public interface FragmentRefreshListener{
        void onRefresh();
    }

    public void getDeviceLocation(){
        mFusedLocationProviderClient = LocationServices.getFusedLocationProviderClient(this);
        try{
            if(mLocationPermissionsGranted){
                final Task location = mFusedLocationProviderClient.getLastLocation();
                location.addOnCompleteListener(new OnCompleteListener() {
                    @Override
                    public void onComplete(@NonNull Task task) {
                        if(task.isSuccessful()){
                                Log.d("YAY", "GOT LOCATION");
                                Location currentLocation = (Location) task.getResult();
                                lat = currentLocation.getLatitude();
                                lon = currentLocation.getLongitude();

                        }else{
                            Log.d("null", "onComplete: current location is null");
                        }
                    }
                });
            }
        }catch (SecurityException e){
            Log.e("tag", "getDeviceLocation: SecurityException: " + e.getMessage() );
        }
    }

    public void getLocationPermission(){
        Log.d("tag", "getLocationPermission: getting location permissions");
        String[] permissions = {Manifest.permission.ACCESS_FINE_LOCATION,
                Manifest.permission.ACCESS_COARSE_LOCATION};

        if(ContextCompat.checkSelfPermission(this.getApplicationContext(),
                FINE_LOCATION) == PackageManager.PERMISSION_GRANTED){
            if(ContextCompat.checkSelfPermission(this.getApplicationContext(),
                    COURSE_LOCATION) == PackageManager.PERMISSION_GRANTED){
                mLocationPermissionsGranted = true;

            }else{
                ActivityCompat.requestPermissions(this,
                        permissions,
                        LOCATION_PERMISSION_REQUEST_CODE);
            }
        }else{
            ActivityCompat.requestPermissions(this,
                    permissions,
                    LOCATION_PERMISSION_REQUEST_CODE);
        }
    }

    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
        Log.d("tag", "onRequestPermissionsResult: called.");
        boolean mLocationPermissionsGranted = false;

        switch(requestCode){
            case LOCATION_PERMISSION_REQUEST_CODE:{
                if(grantResults.length > 0){
                    for(int i = 0; i < grantResults.length; i++){
                        if(grantResults[i] != PackageManager.PERMISSION_GRANTED){
                            mLocationPermissionsGranted = false;
                            Log.d("tag", "onRequestPermissionsResult: permission failed");
                            return;
                        }
                    }
                    Log.d("tag", "onRequestPermissionsResult: permission granted");
                    mLocationPermissionsGranted = true;
                }
            }
        }
    }
}