import android.content.res.Configuration

import androidx.appcompat.app.AppCompatActivity

import android.os.Bundle

import android.widget.LinearLayout

​

class MainActivity : AppCompatActivity() {

​

    private lateinit var linearLayout: LinearLayout

​

    override fun onCreate(savedInstanceState: Bundle?) {

        super.onCreate(savedInstanceState)

        setContentView(R.layout.activity_main)

​

        linearLayout = findViewById(R.id.linear_layout)

​

        // Check the current orientation and set the initial layout orientation

        updateOrientation(resources.configuration.orientation)

​

        // Register a configuration change listener

        registerOrientationListener()

    }

​

    private fun registerOrientationListener() {

        val listener = object : OrientationEventListener(this) {

            override fun onOrientationChanged(orientation: Int) {

                if (orientation == ORIENTATION_UNKNOWN) return

​

                val newOrientation = if (orientation in 45..134 || orientation in 225..314) {

                    Configuration.ORIENTATION_LANDSCAPE

                } else {

                    Configuration.ORIENTATION_PORTRAIT

                }

​

                updateOrientation(newOrientation)

            }

        }

​

        if (listener.canDetectOrientation()) {

            listener.enable()

        }

    }

​

    private fun updateOrientation(newOrientation: Int) {

        linearLayout.orientation = if (newOrientation == Configuration.ORIENTATION_LANDSCAPE) {

            LinearLayout.HORIZONTAL

        } else {

            LinearLayout.VERTICAL

        }

    }

}