我是android开发的新手，正在使用java在android studio中构建一个天气应用。我想使用来自openweathermap.org的API，以使用纬度和经度点获取有关天气的信息。我生成了一个API密钥，但是当我在代码中单击开放天气地图的URL时，它显示错误401，并且没有显示JSON信息，并且当我在模拟器中运行该应用程序时，它会显示一条“请求失败”的消息。我用onfailure方法编码。我在这个问题上停留了3天。我在下面附上代码。
package com.londonappbrewery.climapm;
import android.Manifest;
import android.content.Context;
import android.content.pm.PackageManager;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.v4.app.ActivityCompat;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.widget.ImageButton;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;
import com.loopj.android.http.AsyncHttpClient;
import com.loopj.android.http.RequestParams;
import com.loopj.android.http.JsonHttpResponseHandler;
import org.json.JSONObject;
import cz.msebera.android.httpclient.Header;
public class WeatherController extends AppCompatActivity {
// Constants:
final int REQUEST_CODE =123;
final String WEATHER_URL = "http://api.openweathermap.org/data/2.5/weather";
final String APP_ID = "8256c76143428856df5bc4985ff9e5ef";
// Time between location updates (5000 milliseconds or 5 seconds)
final long MIN_TIME = 5000;
// Distance between location updates (1000m or 1km)
final float MIN_DISTANCE = 1000;
// TODO: Set LOCATION_PROVIDER here:
String LOCATION_PROVIDER = LocationManager.GPS_PROVIDER;
// Member Variables:
TextView mCityLabel;
ImageView mWeatherImage;
TextView mTemperatureLabel;
LocationManager mLocationManager;
LocationListener mLocationListener;
// TODO: Declare a LocationManager and a LocationListener here:
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.weather_controller_layout);
// Linking the elements in the layout to Java code
mCityLabel = (TextView) findViewById(R.id.locationTV);
mWeatherImage = (ImageView) findViewById(R.id.weatherSymbolIV);
mTemperatureLabel = (TextView) findViewById(R.id.tempTV);
ImageButton changeCityButton = (ImageButton) findViewById(R.id.changeCityButton);
// TODO: Add an OnClickListener to the changeCityButton here:
}
// TODO: Add onResume() here:
@Override
protected void onResume() {
super.onResume();
getWeatherForCurrentLocation();
}
// TODO: Add getWeatherForNewCity(String city) here:
// TODO: Add getWeatherForCurrentLocation() here:
private void getWeatherForCurrentLocation() {
mLocationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
mLocationListener = new LocationListener() {
@Override
public void onLocationChanged(Location location) {
Log.d("Clima","onLocationChanges() callback recieved");
String latitude= String.valueOf(location.getLatitude());
String longitude= String.valueOf(location.getLongitude());
Log.d("Clima","latitude is"+latitude);
Log.d("Clima","longitude is"+longitude);
RequestParams params= new RequestParams();
params.put("lat",latitude);
params.put("lon",longitude);
params.put("appid",APP_ID);
letsDoSomeNetworking(params);
}
@Override
public void onStatusChanged(String s, int i, Bundle bundle) {
}
@Override
public void onProviderEnabled(String s) {
}
@Override
public void onProviderDisabled(String s) {
Log.d("Clima","onProviderDisabled(), callback recieved");
}
};
if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
// TODO: Consider calling
// ActivityCompat#requestPermissions
// here to request the missing permissions, and then overriding
// public void onRequestPermissionsResult(int requestCode, String[] permissions,
// int[] grantResults)
// to handle the case where the user grants the permission. See the documentation
// for ActivityCompat#requestPermissions for more details.
ActivityCompat.requestPermissions(this,new String[]{Manifest.permission.ACCESS_FINE_LOCATION},REQUEST_CODE);
return;
}
mLocationManager.requestLocationUpdates(LOCATION_PROVIDER, MIN_TIME, MIN_DISTANCE, mLocationListener);
}
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
if(requestCode==REQUEST_CODE){
if(grantResults.length>0 && grantResults[0]==PackageManager.PERMISSION_GRANTED){
Log.d("Clima","Permission granted!");
}
}
else{
Log.d("Clima","Permission denied");
}
}
// TODO: Add letsDoSomeNetworking(RequestParams params) here:
private void letsDoSomeNetworking(RequestParams params){
AsyncHttpClient client = new AsyncHttpClient();
client.get(WEATHER_URL, params,new JsonHttpResponseHandler(){
@Override
public void onSuccess(int statusCode, Header[] headers, JSONObject response){
Log.d("Clima","Success ! JSON "+response.toString());
WeatherDataModel weatherData = WeatherDataModel.fromJson(response);
Toast.makeText(WeatherController.this,"Request succesfull",Toast.LENGTH_SHORT).show();
updateUI(weatherData);
}
@Override
public void onFailure(int statusCode,Header[] headers, Throwable e,JSONObject response){
Log.d("Clima","Fail ! "+e.toString());
Log.d("Clima","Status Code"+ statusCode);
Toast.makeText(WeatherController.this,"Request failed!",Toast.LENGTH_SHORT).show();
}
});
}
// TODO: Add updateUI() here:
private void updateUI(WeatherDataModel weather){
mTemperatureLabel.setText(weather.getTemperature());
mCityLabel.setText(weather.getCity());
int ResourceID= getResources().getIdentifier(weather.getIconName(),"drawable",getPackageName());
mWeatherImage.setImageResource(ResourceID);
}
// TODO: Add onPause() here:
}
错误401表示验证错误，您确定您的API密钥确定吗？向邮递员查询您的请求以及所有参数，以确认请求。
我认为问题来自于您如何发送参数
在网址末尾添加您的位置和APP_ID
read document of this API here
按城市名称描述：您可以按城市名称或城市名称，州代码和国家/地区代码致电。 API使用与搜索请求匹配的天气参数列表进行响应。API调用：
api.openweathermap.org/data/2.5/weather?q={city name}&appid={your api key}
api.openweathermap.org/data/2.5/weather?q={city name},{state code}&appid={your api key}
api.openweathermap.org/data/2.5/weather?q={city name},{state code},{country code}&appid={your api key}