<activity
android:name=".MainActivity"
android:configChanges="orientation|screenSize|screenLayout|keyboardHidden">
...
</activity>
縦画面用のレイアウトと、横画面用のレイアウトを用意する。例としてここでは縦画面では上部に 16:9 で配置し、横画面では全画面に配置している。
縦画面用
res/layout/activity_main_port.xml
<?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/constraintLayout"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<include
android:id="@+id/container"
layout="@layout/activity_main"
android:layout_width="0dp"
android:layout_height="0dp"
app:layout_constraintDimensionRatio="16:9"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>
横画面用res/layout/activity_main_land.xml
<?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/constraintLayout"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<include
android:id="@+id/container"
layout="@layout/activity_main"
android:layout_width="0dp"
android:layout_height="0dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>
activity_main_port.xml と activity_main_land.xml からそれぞれ ConstraintSet を構成する。onConfigurationChanged() で画面の向きに応じて対応する ConstraintSet を ConstraintLayout に applyTo() する。
class MainActivity : AppCompatActivity() {
private val constraintSetPort = ConstraintSet()
private val constraintSetLand = ConstraintSet()
private lateinit var constraintLayout: ConstraintLayout
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
val layoutId = when (resources.configuration.orientation) {
Configuration.ORIENTATION_LANDSCAPE -> R.layout.activity_main_land
else -> R.layout.activity_main_port
}
setContentView(layoutId)
constraintLayout = findViewById(R.id.constraintLayout)
constraintSetPort.clone(this, R.layout.activity_main_port)
constraintSetLand.clone(this, R.layout.activity_main_land)
}
override fun onConfigurationChanged(newConfig: Configuration) {
super.onConfigurationChanged(newConfig)
val constraintSet = when (newConfig.orientation) {
Configuration.ORIENTATION_LANDSCAPE -> constraintSetLand
else -> constraintSetPort
}
constraintSet.applyTo(constraintLayout)
}
}
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