kotlin - onApplyWindowInsets(WindowInsets insets) 没有被调用

Question

我目前正在使用扩展约束布局的自定义 View ，但它不会在 View onApplyWindowInsets(WindowInsets insets) 中触发此覆盖方法，不确定丢失了什么。

  class TestCustomView @JvmOverloads constructor(
  context: Context,
  attrs: AttributeSet? = null,
  defStyleAttr: Int = 0
) : ConstraintLayout(context, attrs, defStyleAttr) {


    init {


    }
    //This method one not get called
    override fun onApplyWindowInsets(insets: WindowInsets): WindowInsets {
    return super.onApplyWindowInsets(insets)
        val statusBarHeight = insets.systemWindowInsetTop
    }


    override fun fitSystemWindows(insets: Rect): Boolean {
    if (Build.VERSION.SDK_INT == Build.VERSION_CODES.KITKAT) {
      // Intentionally do not modify the bottom inset. For some reason,
      // if the bottom inset is modified, window resizing stops working.
      insets.left = 0
      insets.top = 0
      insets.right = 0
    }
    return super.fitSystemWindows(insets)
  }


}

Answer 1

一旦 insets 被消耗，沿层次结构的传播就会停止。看起来更高的东西正在消耗可用的东西。见 isConsumed() 的 窗口插入 .

Check if these insets have been fully consumed.

Insets are considered "consumed" if the applicable consume* methods have been called such that all insets have been set to zero. This affects propagation of insets through the view hierarchy; insets that have not been fully consumed will continue to propagate down to child views.