活动不是从实时数据更新的

Question

我正在尝试构建一个天气应用程序，所以我使用mvvm结构，我正在使用位置服务来获取当前位置，我正在viewModel中获取位置，但它没有在屏幕上更新，当我直接在mainactivity上使用位置服务时，它正在显示结果，但一旦我在另一个类中定义了相同的功能，ui就没有更新。

下面是代码

MainActicity.kt

@AndroidEntryPoint
class MainActivity : AppCompatActivity() {
private lateinit var binding:ActivityMainBinding
private lateinit var weatherModel:WeatherViewModel
private lateinit var fusedLocationProviderClient: FusedLocationProviderClient
//    private var latitude:Double = 00.00
//    private var longitude:Double = 00.00

override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
fusedLocationProviderClient = LocationServices.getFusedLocationProviderClient(this)
binding = ActivityMainBinding.inflate(layoutInflater)
setContentView(binding.root)
weatherModel = ViewModelProvider(this)[WeatherViewModel::class.java]
//        Log.d("weatherModel","${weatherModel.weatherResp}")
//        Log.d("longi","$longitude")
//        weatherModel.getWeather(latitude,longitude)
//accessing location from viewModel
if(weatherModel.fetchLocation()){
ActivityCompat.requestPermissions(this, arrayOf(android.Manifest.permission.ACCESS_FINE_LOCATION),101)
return
}
weatherModel.weatherResp.observe(this){
weather->
binding.apply {
tvDescription.text = weather.weather[0].description
livelocation.setOnClickListener {
Toast.makeText(this@MainActivity, "this is rohit", Toast.LENGTH_SHORT).show()
}
tvWind.text = weather.wind.speed.toString() + " Km/h"
humidity.text = weather.main.humidity.toString()
val tempInC = weather.main.temp - 273.15
val number3digits:Double = (tempInC * 1000.0).roundToInt() / 1000.0
tvTemperature.text = number3digits.toString()
visibility.text = weather.visibility.toString()
//

}
}

}
//    private fun fetchLocation(){
//        val task = fusedLocationProviderClient.lastLocation
//        if(ActivityCompat.checkSelfPermission(this,android.Manifest.permission.ACCESS_FINE_LOCATION)
//        !=PackageManager.PERMISSION_GRANTED &&
//           ActivityCompat.checkSelfPermission(this,android.Manifest.permission.ACCESS_COARSE_LOCATION)
//           !=PackageManager.PERMISSION_GRANTED
//                ){
//            ActivityCompat.requestPermissions(this, arrayOf(android.Manifest.permission.ACCESS_FINE_LOCATION),101)
//            return
//        }
//        task.addOnSuccessListener {
//            if(it!=null){
//                latitude=it.latitude
//                longitude= it.longitude
//                weatherModel.getWeather(latitude,longitude)
//                Log.d("longi","$longitude")
//                val address = getAddressName(it.latitude,it.longitude)
//                binding.tvCityName.text = address
//            }
//        }
//
//    }
//    private fun getAddressName(lat:Double,long:Double):String{
//        Log.d("lat", lat.toString())
//        var addressName = " "
//        val geoCoder = Geocoder(this, Locale.getDefault())
//        val address = geoCoder.getFromLocation(lat,long,1)
//        if (address != null) {
//            addressName = address[0].subAdminArea
//        }
//        Log.d("Address", address.toString())
//        Log.d("subadmin",addressName.toString())
//        return addressName
//
//    }
//
//
//    private fun getCoordinates(cord:String){
//        var city = binding.locationQuery.text.toString()
////        val geocodeListener = Geocoder.GeocodeListener { addresses ->
////            addresses[0]
////        }
//        val geocoder = Geocoder(this,Locale.getDefault())
//        val address = geocoder.getFromLocationName(city,2)
//        val result = address?.get(0)
//
//
//    }
}

WeatherViewModel.kt

@HiltViewModel
class WeatherViewModel @Inject constructor(
private val repo:WeatherRepository,
private val application: Application,
private val fusedLocationProviderClient: FusedLocationProviderClient
) :ViewModel(){
private var getLatitude: Double = 00.00
private var getLongitude: Double = 00.00
private val _resp = MutableLiveData<WeatherDTO>()
val weatherResp:LiveData<WeatherDTO>
get() = _resp

private val _cord = MutableLiveData<Coord>()
val cord:LiveData<Coord>
get() = _cord

//    init {
//        check()
//        getWeather(getLatitude,getLongitude)
//    }
fun getWeather(latitude:Double,longitude:Double) =
viewModelScope.launch {
repo.getWeather(latitude,longitude).let { response->
if(response.isSuccessful){
_resp.postValue(response.body())
}else{
Log.d("Weather Error","getWeather Error Response: ${response.message()}")
}
}
}

fun fetchLocation():Boolean{
val task = fusedLocationProviderClient.lastLocation
if(ActivityCompat.checkSelfPermission(application,android.Manifest.permission.ACCESS_FINE_LOCATION)
!=PackageManager.PERMISSION_GRANTED &&
ActivityCompat.checkSelfPermission(application,android.Manifest.permission.ACCESS_COARSE_LOCATION)
!=PackageManager.PERMISSION_GRANTED
){
return true
}
task.addOnSuccessListener {
if(it!=null){
//                latitude=it.latitude
//                longitude= it.longitude
getWeather(it.latitude,it.longitude)
//                Log.d("lati","${it.latitude}")
//                Log.d("longimaa","${it.longitude}")
//                val address = getAddressName(it.latitude,it.longitude)
//                _cord.postValue(it.latitude,it.longitude)
//                binding.tvCityName.text = address
}
}
return true
}
private fun fetchLocationDetails(){
}
private fun getAddressName(lat:Double,long:Double):String{
Log.d("lat", lat.toString())
var addressName = " "
val geoCoder = Geocoder(application, Locale.getDefault())
val address = geoCoder.getFromLocation(lat,long,1)
if (address != null) {
addressName = address[0].subAdminArea
}
Log.d("Address", address.toString())
Log.d("subadmin",addressName.toString())
return addressName
}



}

Answer 1

我正在尝试，屏幕结果得到更新

binding.livelocation.setOnClickListener {
if(weatherModel.fetchLocation()){
ActivityCompat.requestPermissions(this, arrayOf(android.Manifest.permission.ACCESS_FINE_LOCATION),101)
}
}

但是仍然不知道这是如何工作的，当放在这个按钮侦听器之外时，它不是