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私は天気予報のアプリケーションに取り組んできましたが、それは完璧ではないことを知っています（私はAndroidの開発を始めたばかりです）。しかし、起動時に気象情報を更新する方法がわかりません。私はonCreate（）メソッドですべてを保持しようとしましたが、最初に起動したときに使用した場所と条件に "スティック"します。onCreate（）で天気を更新するには？
私は、これを押すと新しい位置と気象条件を取得するボタンでこれを回避することができましたが、これはあまり直感的ではありません。私はアプリの起動時に新しい条件をどうやって得ることができるのだろうかと思っています。それはonRestart（）を呼び出す必要がありますか？ここで
は、アプリで私の唯一のアクティビティです：
package com.photonfighterlabs.dropweather;
import android.Manifest;
import android.app.Activity;
import android.content.pm.PackageManager;
import android.graphics.drawable.Drawable;
import android.location.Address;
import android.location.Geocoder;
import android.location.Location;
import android.os.Bundle;
import android.support.v4.app.ActivityCompat;
import android.support.v4.content.ContextCompat;
import android.util.Log;
import android.view.View;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;
import com.ftoslab.openweatherretrieverz.CurrentWeatherInfo;
import com.ftoslab.openweatherretrieverz.OpenWeatherRetrieverZ;
import com.ftoslab.openweatherretrieverz.WeatherCallback;
import com.ftoslab.openweatherretrieverz.WeatherUnitConverter;
import com.google.android.gms.location.FusedLocationProviderClient;
import com.google.android.gms.location.LocationServices;
import com.google.android.gms.tasks.OnSuccessListener;
import java.io.IOException;
import java.util.List;
import java.util.Locale;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class WeatherActivity extends Activity {
private double lat;
private double lng;
private String temp;
private String icon;
private TextView tempTextView;
private TextView cityTextView;
private TextView conditionsTextView;
private int LOCATION_PERMISSION_ID = 1001;
CurrentWeatherInfo currentWeatherInfoF;
private String city;
private List<Address> addresses;
private FusedLocationProviderClient mFusedLocationClient;
OpenWeatherRetrieverZ retriever;
ImageView image;
Geocoder geocoder;
@Override
public void onCreate(Bundle bundle) {
super.onCreate(bundle);
setContentView(R.layout.activity_weather);
retriever = new OpenWeatherRetrieverZ(API_KEY); // hidden for obvious reasons, but working
mFusedLocationClient = LocationServices.getFusedLocationProviderClient(this);
geocoder = new Geocoder(this, Locale.getDefault());
tempTextView = (TextView) findViewById(R.id.temp_text_view);
cityTextView = (TextView) findViewById(R.id.city_text_view);
conditionsTextView = (TextView) findViewById(R.id.conditions_text_view);
image = (ImageView) findViewById(R.id.conditions_image);
if (ContextCompat.checkSelfPermission(WeatherActivity.this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
ActivityCompat.requestPermissions(WeatherActivity.this, new String[]{Manifest.permission.ACCESS_FINE_LOCATION}, LOCATION_PERMISSION_ID);
return;
}
mFusedLocationClient.getLastLocation()
.addOnSuccessListener(this, new OnSuccessListener<Location>() {
@Override
public void onSuccess(Location location) {
if (location != null)
lat = location.getLatitude();
lng = location.getLongitude();
try {
addresses = geocoder.getFromLocation(lat, lng, 1);
} catch (IOException e) {
e.printStackTrace();
}
if (!addresses.isEmpty()) {
city = addresses.get(0).getLocality();
cityTextView.setText("Current Weather - " + city);
Log.d("City", city);
}
Log.d("LAT", String.valueOf(lat));
Log.d("LNG", String.valueOf(lng));
}
});
retriever.updateCurrentWeatherInfo(lat, lng, new WeatherCallback() {
@Override
public void onReceiveWeatherInfo(CurrentWeatherInfo currentWeatherInfo) {
currentWeatherInfoF = WeatherUnitConverter.convertToImperial(currentWeatherInfo);
}
@Override
public void onFailure(String error) {
Toast.makeText(WeatherActivity.this, error, Toast.LENGTH_SHORT).show();
}
});
}
public void onRetrieveButtonClick(View view) {
mFusedLocationClient.getLastLocation()
.addOnSuccessListener(this, new OnSuccessListener<Location>() {
@Override
public void onSuccess(Location location) {
if (location != null)
lat = location.getLatitude();
lng = location.getLongitude();
try {
addresses = geocoder.getFromLocation(lat, lng, 1);
} catch (IOException e) {
e.printStackTrace();
}
if (!addresses.isEmpty()) {
city = addresses.get(0).getLocality();
cityTextView.setText("Current Weather - " + city);
Log.d("City", city);
}
Log.d("LAT", String.valueOf(lat));
Log.d("LNG", String.valueOf(lng));
}
});
retriever.updateCurrentWeatherInfo(lat, lng, new WeatherCallback() {
@Override
public void onReceiveWeatherInfo(CurrentWeatherInfo currentWeatherInfo) {
currentWeatherInfoF = WeatherUnitConverter.convertToImperial(currentWeatherInfo);
}
@Override
public void onFailure(String error) {
Toast.makeText(WeatherActivity.this, error, Toast.LENGTH_SHORT).show();
}
});
temp = currentWeatherInfoF.getCurrentTemperature();
Log.d("TMP : ", String.valueOf(temp));
tempTextView.setText(String.valueOf((int) Double.parseDouble(temp)) + (char) 0x00B0);
conditionsTextView.setText(currentWeatherInfoF.getWeatherDescriptionLong());
String iconURL = currentWeatherInfoF.getWeatherIconLink().toString();
Pattern p = Pattern.compile("\\d\\w(n|d)");
Matcher m = p.matcher(iconURL);
if (m.find()) {
icon = m.group();
Log.d("ICON", icon);
String iconName = "r" + icon;
image.setImageResource(getResources().getIdentifier(iconName, "drawable", getPackageName()));
Log.d("NAME", iconName);
}
}
}
10秒ごとに再開メソッドを呼び出す –
ロケーション選択のseprateアクティビティを作成します。 – Anil
oncreateでデータを更新するサービスを作成します。 –