回答編集履歴
2
説明追加
test
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@@ -1,3 +1,5 @@
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kotlin ならコルーチンなのかもしれませんがまだそこまで分からないので出来る範囲で動作をマネてみました。
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java から変換して修正したので java っぽさが残っているかもしれませんが、何かの参考になれば…
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MainActivity.kt
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5
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```kotlin
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1
途中で間違って送ってしまった
test
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@@ -55,4 +55,216 @@
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```
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res/layout/activity_main.xml
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```xml
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<?xml version="1.0" encoding="utf-8"?>
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<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
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xmlns:app="http://schemas.android.com/apk/res-auto"
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xmlns:tools="http://schemas.android.com/tools"
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android:layout_width="match_parent"
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android:layout_height="match_parent"
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tools:context=".MainActivity">
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<androidx.recyclerview.widget.RecyclerView
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android:id="@+id/city_list"
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android:layout_width="0dp"
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android:layout_height="0dp"
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app:layoutManager="androidx.recyclerview.widget.LinearLayoutManager"
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app:layout_constraintBottom_toTopOf="@id/fragment_container_view"
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app:layout_constraintEnd_toEndOf="parent"
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app:layout_constraintStart_toStartOf="parent"
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app:layout_constraintTop_toTopOf="parent" />
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<androidx.fragment.app.FragmentContainerView
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android:id="@+id/fragment_container_view"
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android:layout_width="0dp"
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android:layout_height="0dp"
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app:layout_constraintBottom_toBottomOf="parent"
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app:layout_constraintEnd_toEndOf="parent"
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app:layout_constraintStart_toStartOf="parent"
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app:layout_constraintTop_toBottomOf="@id/city_list"
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tools:layout="@layout/fragment_weather_info" />
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</androidx.constraintlayout.widget.ConstraintLayout>
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-
```
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```
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WeatherInfoFragment.kt
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```kotlin
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import android.os.Bundle
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import android.view.View
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import android.widget.TextView
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import androidx.fragment.app.Fragment
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import androidx.lifecycle.LiveData
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import androidx.lifecycle.MutableLiveData
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import androidx.lifecycle.ViewModel
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import androidx.lifecycle.ViewModelProvider
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import androidx.lifecycle.switchMap
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import java.text.MessageFormat
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//WeatherInfoViewModel の WeatherInfoLiveData から通知を受けて表示する.
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class WeatherInfoFragment : Fragment(R.layout.fragment_weather_info) {
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override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
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super.onViewCreated(view, savedInstanceState)
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val viewModel = ViewModelProvider(requireActivity())[WeatherInfoViewModel::class.java]
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val telopText = view.findViewById<TextView>(R.id.telop_text)
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val descriptionText = view.findViewById<TextView>(R.id.description_text)
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val telopFormat = getString(R.string.telop_format)
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val descriptionFormat = getString(R.string.description_format)
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viewModel.weatherInfoLiveData.observe(viewLifecycleOwner) {
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if (it == null) {
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telopText.text = ""
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descriptionText.text = ""
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} else {
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telopText.text = MessageFormat.format(telopFormat, it.cityName)
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descriptionText.text = MessageFormat.format(descriptionFormat, it.weather, it.latitude, it.longitude)
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}
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}
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}
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}
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class WeatherInfoViewModel : ViewModel() {
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lateinit var model: Model
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private val _cityLiveData = MutableLiveData<City?>()
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private val _weatherInfoLiveData = _cityLiveData.switchMap { model?.requestWeatherInfo(it) }
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val weatherInfoLiveData: LiveData<WeatherInfo?> get() = _weatherInfoLiveData
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fun requestWeatherInfo(city: City) {
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_cityLiveData.value = city
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}
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}
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```
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res/layout/fragment_weather_info.xml
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```xml
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<?xml version="1.0" encoding="utf-8"?>
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<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
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xmlns:app="http://schemas.android.com/apk/res-auto"
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xmlns:tools="http://schemas.android.com/tools"
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android:layout_width="match_parent"
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android:layout_height="match_parent"
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android:layout_margin="8dp"
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tools:context=".WeatherInfoFragment">
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<TextView
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android:id="@+id/title_label"
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android:layout_width="wrap_content"
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android:layout_height="wrap_content"
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android:text="@string/wetherinfo_title"
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android:textSize="24sp"
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app:layout_constraintEnd_toEndOf="parent"
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app:layout_constraintStart_toStartOf="parent"
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app:layout_constraintTop_toTopOf="parent" />
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<TextView
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android:id="@+id/telop_text"
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android:layout_width="0dp"
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android:layout_height="wrap_content"
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android:layout_marginTop="8dp"
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android:textAlignment="textStart"
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android:textSize="20sp"
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app:layout_constraintEnd_toEndOf="parent"
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app:layout_constraintStart_toStartOf="parent"
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app:layout_constraintTop_toBottomOf="@id/title_label"
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tools:text="telop" />
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<TextView
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android:id="@+id/description_text"
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android:layout_width="0dp"
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android:layout_height="0dp"
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android:layout_marginTop="8dp"
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app:layout_constraintBottom_toBottomOf="parent"
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app:layout_constraintEnd_toEndOf="parent"
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app:layout_constraintStart_toStartOf="parent"
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app:layout_constraintTop_toBottomOf="@id/telop_text"
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tools:text="description" />
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</androidx.constraintlayout.widget.ConstraintLayout>
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```
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Model.kt
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```kotlin
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import androidx.lifecycle.LiveData
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import androidx.lifecycle.MutableLiveData
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import org.json.JSONException
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import org.json.JSONObject
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import java.net.HttpURLConnection
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import java.net.URL
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import java.nio.charset.StandardCharsets
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import java.util.concurrent.Executors
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class Model {
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companion object {
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private const val WEATHERINFO_URL = "https://api.openweathermap.org/data/2.5/weather?lang=ja"
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private const val APP_ID = "c1a8424a8556a2fa057cffa058930173"
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}
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private val executorService = Executors.newSingleThreadExecutor()
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//サーバから天気情報を取得し LiveData に入れる.
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fun requestWeatherInfo(city: City?): LiveData<WeatherInfo?> {
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val liveData = MutableLiveData<WeatherInfo?>()
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if (city != null) executorService.submit(WeatherInfoReceiver(URL("${WEATHERINFO_URL}&q=${city.q}&appid=${APP_ID}"), liveData))
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return liveData
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}
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}
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class WeatherInfoReceiver(private val url: URL, private val liveData: MutableLiveData<WeatherInfo?>) : Runnable {
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override fun run() {
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var con: HttpURLConnection? = null
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try {
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con = url.openConnection().apply {
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connectTimeout = 1000
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readTimeout = 1000
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} as HttpURLConnection
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liveData.postValue(parseJSON(con.inputStream.reader(StandardCharsets.UTF_8).readText()))
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} catch (e: Exception) {
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e.printStackTrace()
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liveData.postValue(null)
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} finally {
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con?.disconnect()
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}
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}
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@Throws(JSONException::class)
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fun parseJSON(json: String): WeatherInfo {
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val root = JSONObject(json)
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val cityName = root.getString("name")
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val coord = root.getJSONObject("coord")
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val latitude = coord.getString("lat")
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val longitude = coord.getString("lon")
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val weather = root.getJSONArray("weather").getJSONObject(0).getString("description")
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return WeatherInfo(cityName, latitude, longitude, weather)
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}
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}
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class City(val name: String, val q: String) {
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override fun toString() =
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"City@${hashCode().toString(16)}[name=$name,q=$q]"
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}
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class WeatherInfo(val cityName: String, val latitude: String, val longitude: String, val weather: String) {
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override fun toString() =
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"WeatherInfo@${hashCode().toString(16)}[cityName=$cityName,latitude=$latitude,longitude=$longitude,weather=$weather]"
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}
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```
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res/values/strings.xml
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255
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```xml
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<resources>
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<string name="app_name">お天気情報</string>
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<string name="wetherinfo_title">お天気詳細</string>
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<string name="telop_format">{0}の天気</string>
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<string name="description_format">現在は{0}です。\n緯度は{1}度で経度は{2}度です。</string>
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</resources>
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```
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AndroidManifest.xml に追加
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264
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```
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265
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<uses-permission android:name="android.permission.INTERNET"/>
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```
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267
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build.gradle(:app) dependencies に追加
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268
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```
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269
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implementation "androidx.lifecycle:lifecycle-livedata-ktx:2.6.2"
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270
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```
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