ViewCompanion.kt

import android.os.Build
import android.view.View
import java.util.concurrent.atomic.AtomicInteger

object ViewCompanion {

    private val NEXT_GENERATED_ID = AtomicInteger(1)

    /**
     * Inspired by: https://stackoverflow.com/a/15442997/458365
     */
    fun generateViewId() : Int =
        if (Build.VERSION.SDK_INT < 17) {
            nextGeneratedId()
        } else {
            View.generateViewId()
        }

    private fun nextGeneratedId(): Int {
        while (true) {
            val result = NEXT_GENERATED_ID.get()
            val newValue = result.getNextHighByteNonZero()
            if (NEXT_GENERATED_ID.compareAndSet(result, newValue)) {
                return result
            }
        }
    }

}

/**
 * aapt-generated IDs have the high byte nonzero; clamp to the range under that.
 */
private fun Int.getNextHighByteNonZero() = (this + 1).takeIf { it > 0x00FFFFFF } ?: 1