这是我第一次使用stackoverflow，对不起我的问题。我一直在学习java和swift只有4-5个月，所以我只是一个初学者。 我正在使用谷歌地图和一些其他功能（如天气活动）编写一个简单的应用程序。 地图活动运行完美，天气活动也是如此，但仅限于静态纬度和经度：
asyncTask.execute("28.125696","-15.440090" );
如何在currentLocation.getLatitude()的MainActivityWeather中实现获取currentLocation.getLongitude()，asyncTask.execute(...);？
我在想吗？这是使用当前位置数据构建天气应用程序的好方法吗？地图活动：
public class MapActivity extends AppCompatActivity implements OnMapReadyCallback, GoogleApiClient.OnConnectionFailedListener {
@Override
public void onConnectionFailed(@NonNull ConnectionResult connectionResult) {
}
@Override
public void onMapReady(GoogleMap googleMap) {
Toast.makeText(this, "Map is Ready", Toast.LENGTH_SHORT).show();
Log.d(TAG, "onMapReady: map is ready");
mMap = googleMap;
if (mLocationPermissionsGranted) {
getDeviceLocation();
if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION)
!= PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this,
Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
return;
}
mMap.setMyLocationEnabled(true);
mMap.getUiSettings().setMyLocationButtonEnabled(false);
init();
}
}
private static final String TAG = "MapActivity";
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 static final float DEFAULT_ZOOM = 15f;
public static final LatLngBounds LAT_LNG_BOUNDS = new LatLngBounds(
new LatLng(-40, -168), new LatLng(71, 136)
);
//widgets
private AutoCompleteTextView mSearchText;
private ImageView mGps;
//vars
private Boolean mLocationPermissionsGranted = false;
private GoogleMap mMap;
private FusedLocationProviderClient mFusedLocationProviderClient;
private PlaceAutoCompleteAdapter mPlaceAutoCompleteAdapter;
private GoogleApiClient mGoogleApiClient;
private PlaceInfo mPlace;
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_map);
mSearchText = (AutoCompleteTextView) findViewById(R.id.input_search);
mGps = (ImageView) findViewById(R.id.ic_gps);
getLocationPermission();
BottomNavigationView bottomNav = findViewById(R.id.bottom_nav);
BottomNavigationViewHelper.removeShiftMode(bottomNav);
bottomNav.setOnNavigationItemSelectedListener(new BottomNavigationView.OnNavigationItemSelectedListener() {
@Override
public boolean onNavigationItemSelected(@NonNull MenuItem item) {
switch (item.getItemId()){
case R.id.nav_menu:
Intent intent0 = new Intent(MapActivity.this, MainActivity.class);
startActivity(intent0);
break;
case R.id.nav_note:
Intent intent1 = new Intent(MapActivity.this, MainListActivity.class);
startActivity(intent1);
break;
case R.id.nav_map:
break;
case R.id.nav_attraction:
Intent intent3 = new Intent(MapActivity.this, MainActivityGrid.class);
startActivity(intent3);
break;
}
return false;
}
});
}
private void init(){
Log.d(TAG, "init: initializing");
mGoogleApiClient = new GoogleApiClient
.Builder(this)
.addApi(Places.GEO_DATA_API)
.addApi(Places.PLACE_DETECTION_API)
.enableAutoManage(this, this)
.build();
mSearchText.setOnItemClickListener(mAutocompleteClickListener );
mPlaceAutoCompleteAdapter = new PlaceAutoCompleteAdapter(this, mGoogleApiClient, LAT_LNG_BOUNDS, null);
mSearchText.setAdapter(mPlaceAutoCompleteAdapter);
mSearchText.setOnEditorActionListener(new TextView.OnEditorActionListener() {
@Override
public boolean onEditorAction(TextView textView, int actionId, KeyEvent keyEvent) {
if(actionId == EditorInfo.IME_ACTION_SEARCH
|| actionId == EditorInfo.IME_ACTION_DONE
|| keyEvent.getAction() == KeyEvent.ACTION_DOWN
|| keyEvent.getAction() == KeyEvent.KEYCODE_ENTER){
//execute our method for searching
geoLocate();
}
return false;
}
});
mGps.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Log.d(TAG, "onClick: clicked gps icon");
getDeviceLocation();
}
});
hideSoftKeyboard();
}
private void geoLocate(){
Log.d(TAG, "geoLocate: geolocating");
String searchString = mSearchText.getText().toString();
Geocoder geocoder = new Geocoder(MapActivity.this);
List<Address> list = new ArrayList<>();
try{
list = geocoder.getFromLocationName(searchString,1);
}catch (IOException e) {
Log.d(TAG, "geoLocate: IOException " +e.getMessage());
}
if(list.size() > 0 ){
Address address = list.get(0);
Log.d(TAG, "geoLocate: found a location "+ address.toString());
moveCamera(new LatLng(address.getLatitude(), address.getLongitude()), DEFAULT_ZOOM, address.getAddressLine(0));
}
}
private void getDeviceLocation(){
Log.d(TAG, "getDeviceLocation: getting the devices current location");
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()&& task.getResult() != null){
Log.d(TAG, "onComplete: found location!");
Location currentLocation = (Location) task.getResult();
moveCamera(new LatLng(currentLocation.getLatitude(), currentLocation.getLongitude()),
DEFAULT_ZOOM, "My location");
}else{
Log.d(TAG, "onComplete: current location is null");
Toast.makeText(MapActivity.this, "unable to get current location", Toast.LENGTH_SHORT).show();
}
}
});
}
}catch (SecurityException e){
Log.e(TAG, "getDeviceLocation: SecurityException: " + e.getMessage() );
}
}
private void moveCamera(LatLng latLng, float zoom, String title){
Log.d(TAG, "moveCamera: moving the camera to: lat: " + latLng.latitude + ", lng: " + latLng.longitude );
mMap.moveCamera(CameraUpdateFactory.newLatLngZoom(latLng, zoom));
if(!title.equals("My location")){
MarkerOptions options = new MarkerOptions().position(latLng).title(title);
mMap.addMarker(options);
}
hideSoftKeyboard();
}
private void initMap(){
Log.d(TAG, "initMap: initializing map");
SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map);
mapFragment.getMapAsync(MapActivity.this);
}
private 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;
initMap();
}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.");
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;
//initialize our map
initMap();
}
}
}
}
private void hideSoftKeyboard(){
this.getWindow().setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_STATE_ALWAYS_HIDDEN);
}
private AdapterView.OnItemClickListener mAutocompleteClickListener = new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
hideSoftKeyboard();
final AutocompletePrediction item = mPlaceAutoCompleteAdapter.getItem(i);
final String placeId = item.getPlaceId();
PendingResult<PlaceBuffer> placeResult = Places.GeoDataApi
.getPlaceById(mGoogleApiClient, placeId);
placeResult.setResultCallback(mUpdatePlaceDetailsCallback);
}
};
private ResultCallback<PlaceBuffer> mUpdatePlaceDetailsCallback = new ResultCallback<PlaceBuffer>() {
@Override
public void onResult(@NonNull PlaceBuffer places) {
if (!places.getStatus().isSuccess()) {
Log.d(TAG, "onResult: Place query did not mplete successfully" + places.getStatus().toString());
places.release();
return;
}
final Place place = places.get(0);
try{
mPlace = new PlaceInfo();
mPlace.setName(place.getName().toString());
Log.d(TAG, "onResult: name: " + place.getName());
mPlace.setAddress(place.getAddress().toString());
Log.d(TAG, "onResult: address: " + place.getAddress());
mPlace.setAttributions(place.getAttributions().toString());
Log.d(TAG, "onResult: attributions: " + place.getAttributions());
mPlace.setId(place.getId());
Log.d(TAG, "onResult: id:" + place.getId());
mPlace.setLatlng(place.getLatLng());
Log.d(TAG, "onResult: latlng: " + place.getLatLng());
mPlace.setRating(place.getRating());
Log.d(TAG, "onResult: rating: " + place.getRating());
mPlace.setPhoneNumber(place.getPhoneNumber().toString());
Log.d(TAG, "onResult: phone number: " + place.getPhoneNumber());
mPlace.setWebsiteUri(place.getWebsiteUri());
Log.d(TAG, "onResult: website uri: " + place.getWebsiteUri());
Log.d(TAG, "onResult: place: " + mPlace.toString());
}catch (NullPointerException e){
Log.e(TAG, "onResult: NullPointerException: " + e.getMessage() );
}
moveCamera(new LatLng(place.getViewport().getCenter().latitude,
place.getViewport().getCenter().longitude), DEFAULT_ZOOM, mPlace.getName());
places.release();
}
};}
Wheather Activities:
public class MainActivityWeather extends AppCompatActivity {
private static final String TAG = "WeatherActivity";
TextView cityField, detailsField, currentTemperatureField, humidity_field, pressure_field, weatherIcon, updatedField;
Typeface weatherFont;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// getSupportActionBar().hide();
setContentView(R.layout.activity_main_weather);
weatherFont = Typeface.createFromAsset(getApplicationContext().getAssets(), "fonts/weathericons-regular-webfont.ttf");
cityField = (TextView)findViewById(R.id.city_field);
updatedField = (TextView)findViewById(R.id.updated_field);
detailsField = (TextView)findViewById(R.id.details_field);
currentTemperatureField = (TextView)findViewById(R.id.current_temperature_field);
humidity_field = (TextView)findViewById(R.id.humidity_field);
pressure_field = (TextView)findViewById(R.id.pressure_field);
weatherIcon = (TextView)findViewById(R.id.weather_icon);
weatherIcon.setTypeface(weatherFont);
Function.placeIdTask asyncTask =new Function.placeIdTask(new Function.AsyncResponse() {
public void processFinish(String weather_city, String weather_description, String weather_temperature, String weather_humidity, String weather_pressure, String weather_updatedOn, String weather_iconText, String sun_rise) {
cityField.setText(weather_city);
updatedField.setText(weather_updatedOn);
detailsField.setText(weather_description);
currentTemperatureField.setText(weather_temperature);
humidity_field.setText("Humidity: "+weather_humidity);
pressure_field.setText("Pressure: "+weather_pressure);
weatherIcon.setText(Html.fromHtml(weather_iconText));
}
});
asyncTask.execute( ); // asyncTask.execute("Latitude", "Longitude")
}}
public class Function {
private static final String OPEN_WEATHER_MAP_URL =
"http://api.openweathermap.org/data/2.5/weather?lat=%s&lon=%s&units=metric";
private static final String OPEN_WEATHER_MAP_API = "fdbf72863aba44b6fc7ce9e3324a689f";
public static String setWeatherIcon(int actualId, long sunrise, long sunset){
int id = actualId / 100;
String icon = "";
if(actualId == 800){
long currentTime = new Date().getTime();
if(currentTime>=sunrise && currentTime<sunset) {
icon = "";
} else {
icon = "";
}
} else {
switch(id) {
case 2 : icon = "";
break;
case 3 : icon = "";
break;
case 7 : icon = "";
break;
case 8 : icon = "";
break;
case 6 : icon = "";
break;
case 5 : icon = "";
break;
}
}
return icon;
}
public interface AsyncResponse {
void processFinish(String output1, String output2, String output3, String output4, String output5, String output6, String output7, String output8);
}
public static class placeIdTask extends AsyncTask<String, Void, JSONObject> {
public AsyncResponse delegate = null;//Call back interface
public placeIdTask(AsyncResponse asyncResponse) {
delegate = asyncResponse;//Assigning call back interfacethrough constructor
}
@Override
protected JSONObject doInBackground(String... params) {
JSONObject jsonWeather = null;
try {
jsonWeather = getWeatherJSON(params[0], params[1]);
} catch (Exception e) {
Log.d("Error", "Cannot process JSON results", e);
}
return jsonWeather;
}
@Override
protected void onPostExecute(JSONObject json) {
try {
if(json != null){
JSONObject details = json.getJSONArray("weather").getJSONObject(0);
JSONObject main = json.getJSONObject("main");
DateFormat df = DateFormat.getDateTimeInstance();
String city = json.getString("name").toUpperCase(Locale.US) + ", " + json.getJSONObject("sys").getString("country");
String description = details.getString("description").toUpperCase(Locale.US);
String temperature = String.format("%.2f", main.getDouble("temp"))+ "°";
String humidity = main.getString("humidity") + "%";
String pressure = main.getString("pressure") + " hPa";
String updatedOn = df.format(new Date(json.getLong("dt")*1000));
String iconText = setWeatherIcon(details.getInt("id"),
json.getJSONObject("sys").getLong("sunrise") * 1000,
json.getJSONObject("sys").getLong("sunset") * 1000);
delegate.processFinish(city, description, temperature, humidity, pressure, updatedOn, iconText, ""+ (json.getJSONObject("sys").getLong("sunrise") * 1000));
}
} catch (JSONException e) {
//Log.e(LOG_TAG, "Cannot process JSON results", e);
}
}
}
public static JSONObject getWeatherJSON(String lat, String lon){
try {
URL url = new URL(String.format(OPEN_WEATHER_MAP_URL, lat, lon));
HttpURLConnection connection =
(HttpURLConnection)url.openConnection();
connection.addRequestProperty("x-api-key", OPEN_WEATHER_MAP_API);
BufferedReader reader = new BufferedReader(
new InputStreamReader(connection.getInputStream()));
StringBuffer json = new StringBuffer(1024);
String tmp="";
while((tmp=reader.readLine())!=null)
json.append(tmp).append("\n");
reader.close();
JSONObject data = new JSONObject(json.toString());
// This value will be 404 if the request was not
// successful
if(data.getInt("cod") != 200){
return null;
}
return data;
}catch(Exception e){
return null;
}
}}