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June 25, 2023 00:57
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Fragmentの値の保存と復元
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<?xml version="1.0" encoding="utf-8"?> | |
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android" | |
xmlns:app="http://schemas.android.com/apk/res-auto" | |
xmlns:tools="http://schemas.android.com/tools" | |
android:id="@+id/frameLayout" | |
android:layout_width="match_parent" | |
android:layout_height="match_parent" | |
tools:context=".MainFragment"> | |
<Button | |
android:id="@+id/button1" | |
android:layout_width="0dp" | |
android:layout_height="wrap_content" | |
android:layout_marginStart="8dp" | |
android:layout_marginTop="8dp" | |
android:layout_marginEnd="8dp" | |
android:text="Button" | |
app:layout_constraintEnd_toStartOf="@+id/button2" | |
app:layout_constraintHorizontal_bias="0.5" | |
app:layout_constraintStart_toStartOf="parent" | |
app:layout_constraintTop_toBottomOf="@+id/textView2" /> | |
<Button | |
android:id="@+id/button2" | |
android:layout_width="0dp" | |
android:layout_height="wrap_content" | |
android:layout_marginStart="8dp" | |
android:layout_marginEnd="8dp" | |
android:text="Button" | |
app:layout_constraintEnd_toEndOf="parent" | |
app:layout_constraintHorizontal_bias="0.5" | |
app:layout_constraintStart_toEndOf="@+id/button1" | |
app:layout_constraintTop_toTopOf="@+id/button1" /> | |
<TextView | |
android:id="@+id/textView1" | |
android:layout_width="wrap_content" | |
android:layout_height="wrap_content" | |
android:text="TextView" | |
app:layout_constraintStart_toStartOf="parent" | |
app:layout_constraintTop_toTopOf="parent" /> | |
<TextView | |
android:id="@+id/textView2" | |
android:layout_width="wrap_content" | |
android:layout_height="wrap_content" | |
android:text="TextView" | |
app:layout_constraintStart_toStartOf="parent" | |
app:layout_constraintTop_toBottomOf="@+id/textView1" /> | |
</androidx.constraintlayout.widget.ConstraintLayout> |
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package com.example.myapplication | |
import android.os.Bundle | |
import android.util.Log | |
import androidx.fragment.app.Fragment | |
import android.view.LayoutInflater | |
import android.view.View | |
import android.view.ViewGroup | |
import android.widget.Button | |
import android.widget.TextView | |
import androidx.annotation.VisibleForTesting | |
class MainFragment : Fragment() { | |
@VisibleForTesting | |
var value1: Int = DEFAULT_VALUE1 | |
@VisibleForTesting | |
var value2: String = DEFAULT_VALUE2 | |
override fun onCreateView( | |
inflater: LayoutInflater, container: ViewGroup?, | |
savedInstanceState: Bundle? | |
): View? { | |
return inflater.inflate(R.layout.fragment_main, container, false) | |
} | |
override fun onSaveInstanceState(outState: Bundle) { | |
super.onSaveInstanceState(outState) | |
outState.putInt("value1", value1) | |
outState.putString("value2", value2) | |
} | |
override fun onViewCreated(view: View, savedInstanceState: Bundle?) { | |
super.onViewCreated(view, savedInstanceState) | |
value1 = savedInstanceState?.getInt("value1") ?: DEFAULT_VALUE1 | |
value2 = savedInstanceState?.getString("value2") ?: DEFAULT_VALUE2 | |
view.findViewById<Button>(R.id.button1).setOnClickListener { | |
value1 = 0 | |
value2 = "foo" | |
Log.d("MainFragment", "button1 clicked") | |
updateViews() | |
} | |
view.findViewById<Button>(R.id.button2).setOnClickListener { | |
value1 = 1 | |
value2 = "bar" | |
Log.d("MainFragment", "button2 clicked") | |
updateViews() | |
} | |
} | |
override fun onResume() { | |
super.onResume() | |
Log.d("MainFragment", "onResume") | |
updateViews() | |
} | |
private fun updateViews() { | |
Log.d("MainFragment", "updateViews: $value1, $value2") | |
view?.findViewById<TextView>(R.id.textView1)?.text = "$value1" | |
view?.findViewById<TextView>(R.id.textView2)?.text = value2 | |
} | |
companion object { | |
const val DEFAULT_VALUE1 = 0 | |
const val DEFAULT_VALUE2 = "foo" | |
} | |
} |
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package com.example.myapplication | |
import androidx.fragment.app.testing.launchFragmentInContainer | |
import androidx.test.espresso.Espresso.onView | |
import androidx.test.espresso.action.ViewActions.click | |
import androidx.test.espresso.matcher.ViewMatchers.withId | |
import androidx.test.ext.junit.runners.AndroidJUnit4 | |
import org.junit.Assert.* | |
import org.junit.Test | |
import org.junit.runner.RunWith | |
@RunWith(AndroidJUnit4::class) | |
class MainFragmentTest { | |
@Test | |
fun `初期状態のテキスト表示`() { | |
val scenario = launchFragmentInContainer<MainFragment>() | |
scenario.onFragment() { | |
assertEquals(0, it.value1) | |
assertEquals("foo", it.value2) | |
} | |
} | |
@Test | |
fun `ボタン2をクリックしたときのテキスト表示`() { | |
val scenario = launchFragmentInContainer<MainFragment>() | |
onView(withId(R.id.button2)).perform(click()) | |
scenario.onFragment() { | |
assertEquals(1, it.value1) | |
assertEquals("bar", it.value2) | |
} | |
} | |
@Test | |
fun `ボタン2をクリックしたあとでフラグメントが再生成`() { | |
val scenario = launchFragmentInContainer<MainFragment>() | |
onView(withId(R.id.button2)).perform(click()) | |
scenario.recreate() | |
scenario.onFragment() { | |
assertEquals(1, it.value1) | |
assertEquals("bar", it.value2) | |
} | |
} | |
} |
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