我对显示天气应用有问题。 我的应用程序使用openweathermap API。 当我运行我的应用程序时，监视器显示
错误” ComponentInfo {com .....} java.lang.IllegalArgumentException： 无效的提供者：null”，然后告诉我“无位置”。
这是我的JSON数据
public class Coord
{
public double lon { get; set; }
public double lat { get; set; }
}
public class Weather
{
public int id { get; set; }
public string main { get; set; }
public string description { get; set; }
public string icon { get; set; }
}
public class Main
{
public double temp { get; set; }
public double pressure { get; set; }
public int humidity { get; set; }
public double temp_min { get; set; }
public double temp_max { get; set; }
public double sea_level { get; set; }
public double grnd_level { get; set; }
}
public class Wind
{
public double speed { get; set; }
public int deg { get; set; }
}
public class Clouds
{
public int all { get; set; }
}
public class Sys
{
public double message { get; set; }
public string country { get; set; }
public int sunrise { get; set; }
public int sunset { get; set; }
}
public class RootObject
{
public Coord coord { get; set; }
public List<Weather> weather { get; set; }
public string @base { get; set; }
public Main main { get; set; }
public Wind wind { get; set; }
public Clouds clouds { get; set; }
public int dt { get; set; }
public Sys sys { get; set; }
public int id { get; set; }
public string name { get; set; }
public int cod { get; set; }
}
我认为我的代码无法获取位置，所以我不确定该怎么做。这是MainActivity.java
import android.Manifest;
import android.app.ProgressDialog;
import android.content.Context;
import android.content.pm.PackageManager;
import android.location.Criteria;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.AsyncTask;
import android.os.Bundle;
import android.support.v4.app.ActivityCompat;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.widget.ImageView;
import android.widget.TextView;
import com.google.gson.Gson;
import com.google.gson.reflect.TypeToken;
import com.squareup.picasso.Picasso;
import com.thpa.a9019.weatherapplication.Common.Common;
import com.thpa.a9019.weatherapplication.Helper.Helper;
import com.thpa.a9019.weatherapplication.Model.OpenWeatherMap;
import java.lang.reflect.Type;
public class MainActivity extends AppCompatActivity implements LocationListener {
TextView txtCity, txtLastUpdate, txtDescription, txtHumidity, txtTime, txtCelsius;
ImageView imageView;
LocationManager locationManager;
String provider;
private Location location;
static double Iat, Ing;
OpenWeatherMap openWeatherMap = new OpenWeatherMap();
int MY_PERMISSION = 0;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//Control Button
txtCity = (TextView) findViewById(R.id.txtCity);
txtLastUpdate = (TextView) findViewById(R.id.txtLastUpdate);
txtDescription = (TextView) findViewById(R.id.txtDescription);
txtHumidity = (TextView) findViewById(R.id.txtHumidity);
txtTime = (TextView) findViewById(R.id.txtTime);
txtCelsius = (TextView) findViewById(R.id.txtCelsius);
imageView = (ImageView) findViewById(R.id.imageView);
//Get Coordinates
locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
provider = locationManager.getBestProvider(new Criteria(), false);
if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
ActivityCompat.requestPermissions(MainActivity.this, new String[]{
Manifest.permission.INTERNET,
Manifest.permission.ACCESS_COARSE_LOCATION,
Manifest.permission.ACCESS_FINE_LOCATION,
Manifest.permission.ACCESS_NETWORK_STATE,
Manifest.permission.SYSTEM_ALERT_WINDOW,
Manifest.permission.SET_WALLPAPER_HINTS
}, MY_PERMISSION);
}
location = locationManager.getLastKnownLocation(provider);
if (location == null)
Log.e("TAG", "No Location");
}
@Override
protected void onPause() {
super.onPause();
if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
ActivityCompat.requestPermissions(MainActivity.this, new String[]{
Manifest.permission.INTERNET,
Manifest.permission.ACCESS_COARSE_LOCATION,
Manifest.permission.ACCESS_FINE_LOCATION,
Manifest.permission.ACCESS_NETWORK_STATE,
Manifest.permission.SYSTEM_ALERT_WINDOW,
Manifest.permission.SET_WALLPAPER_HINTS
}, MY_PERMISSION);
}
locationManager.removeUpdates(this);
}
@Override
protected void onPostResume() {
super.onPostResume();
if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
ActivityCompat.requestPermissions(MainActivity.this, new String[]{
Manifest.permission.INTERNET,
Manifest.permission.ACCESS_COARSE_LOCATION,
Manifest.permission.ACCESS_FINE_LOCATION,
Manifest.permission.ACCESS_NETWORK_STATE,
Manifest.permission.SYSTEM_ALERT_WINDOW,
Manifest.permission.SET_WALLPAPER_HINTS
}, MY_PERMISSION);
}
locationManager.requestLocationUpdates(provider, 400, 1, this);
}
@Override
public void onLocationChanged(Location location) {
Iat = location.getLatitude();
Ing = location.getLongitude();
new GetWeather().execute(Common.apiRequest(String.valueOf(Iat), String.valueOf(Ing)));
}
@Override
public void onStatusChanged(String provider, int status, Bundle extras) {
}
@Override
public void onProviderEnabled(String provider) {
}
@Override
public void onProviderDisabled(String provider) {
}
private class GetWeather extends AsyncTask<String, Void, String> {
ProgressDialog progressDialog = new ProgressDialog(MainActivity.this);
@Override
protected void onPreExecute() {
super.onPreExecute();
progressDialog.setTitle("Please wait....");
progressDialog.show();
}
@Override
protected String doInBackground(String... params) {
String stream = null;
String urlString = params[0];
Helper http = new Helper();
stream = http.getHTTPData(urlString);
return stream;
}
@Override
protected void onPostExecute(String s) {
super.onPostExecute(s);
if (s.contains("Error!! Not found city")) {
progressDialog.dismiss();
return;
}
Gson gson = new Gson();
Type mType = new TypeToken<OpenWeatherMap>() {
}.getType();
openWeatherMap = gson.fromJson(s, mType);
progressDialog.dismiss();
txtCity.setText(String.format("%s,%s", openWeatherMap.getName(), openWeatherMap.getSys().getCountry()));
txtLastUpdate.setText(String.format("Last Update: %s", Common.getDateNow()));
txtDescription.setText(String.format("%s", openWeatherMap.getWeather().get(0).getDescription()));
txtHumidity.setText(String.format("%d%%", openWeatherMap.getMain().getHumidity()));
txtTime.setText(String.format("%s/%s", Common.unixTimeStampToDateTime(openWeatherMap.getSys().getSunrise()), Common.unixTimeStampToDateTime(openWeatherMap.getSys().getSunset())));
txtCelsius.setText(String.format("%.2f °C", openWeatherMap.getMain().getTemp()));
Picasso.with(MainActivity.this)
.load(Common.getImage(openWeatherMap.getWeather().get(0).getIcon()))
.into(imageView);
}
}
}