GestureExclusionDemoView.kt

import android.content.Context
import android.graphics.Canvas
import android.graphics.Rect
import android.os.Build
import android.util.AttributeSet
import android.view.View
import java.util.*

/**
 * @author Drakeet Xu
 */
class GestureExclusionDemoView @JvmOverloads constructor(
  context: Context, attrs: AttributeSet? = null, defStyleAttr: Int = 0
) : View(context, attrs, defStyleAttr) {

  private val exRect = Collections.singletonList(Rect())

  override fun onLayout(changed: Boolean, left: Int, top: Int, right: Int, bottom: Int) {
    super.onLayout(changed, left, top, right, bottom)
    if (changed) {
      updateGestureExclusion()
    }
  }

  override fun onDraw(canvas: Canvas?) {
    super.onDraw(canvas)
    updateGestureExclusion()
  }

  private fun updateGestureExclusion() {
    // Skip this call if we're not running on Android 10+
    if (Build.VERSION.SDK_INT < 29) return

    // Now lets work out which areas should be excluded
    exRect.first().set(0, 0, width, height)

    // Finally pass our updated list of rectangles to the system
    systemGestureExclusionRects = exRect
  }
}