onGlobalLayout 需要判定全屏以及导航栏开启状态，不然会产生误判

[mm-longcheng]

使用PopupWindow辅助监听来将主视图设为adjustNothing，确实是个好方法。
onGlobalLayout 的判断经过我使用多种真机测试，发现需要做很多无效性判定。不然很容易产生误判。

1.横屏模式在切入后台，再切回前台，部分手机会产生视图旋转。触发布局调整。
2.底部导航栏状态变更会触发布局调整。
3.有些时候我们并不会把app设置为全屏，计算键盘高度并不总等于物理高减可视底。
4.有些机型点开软键盘后会频繁触发onGlobalLayout。

这个是我自己使用的一个，可以参考一下。
https://bitbucket.org/mm_longcheng/mm-core/src/dev/nwsi/proj/android/src/org/mm/nwsi/mmUIViewLayoutListener.java

[FreddyChen]

使用PopupWindow辅助监听来将主视图设为adjustNothing，确实是个好方法。
onGlobalLayout 的判断经过我使用多种真机测试，发现需要做很多无效性判定。不然很容易产生误判。

1.横屏模式在切入后台，再切回前台，部分手机会产生视图旋转。触发布局调整。
2.底部导航栏状态变更会触发布局调整。
3.有些时候我们并不会把app设置为全屏，计算键盘高度并不总等于物理高减可视底。
4.有些机型点开软键盘后会频繁触发onGlobalLayout。

这个是我自己使用的一个，可以参考一下。
https://bitbucket.org/mm_longcheng/mm-core/src/dev/nwsi/proj/android/src/org/mm/nwsi/mmUIViewLayoutListener.java

谢谢，目前工作较忙，有空会优化这些bug

[qwer2y]

请问全屏状态下键盘高度该如何获取呢

[Kuki93]

微信这个功能刚出来的时候，我也研究过它的键盘表情切换动画，这里我给出我的实现键盘高度计算的方法，目前没发现有兼容性问题 @FreddyChen

class KeyboardChangeMonitor(
    private val context: Context,
    private val parentView: View
) : PopupWindow(context), ViewTreeObserver.OnGlobalLayoutListener {

    private val isAtLeastSdkR = Build.VERSION.SDK_INT >= Build.VERSION_CODES.R

    class AssistPopupWindow(
        context: Context,
        private val parentView: View
    ) : PopupWindow(context) {

        private val isAtLeastSdkR = Build.VERSION.SDK_INT >= Build.VERSION_CODES.R

        init {
            if (!isAtLeastSdkR) {
                contentView = Space(context)
                softInputMode = WindowManager.LayoutParams.SOFT_INPUT_ADJUST_NOTHING
                width = 0
                height = WindowManager.LayoutParams.MATCH_PARENT
            }
        }

        fun start() {
            if (!isAtLeastSdkR) {
                if (!isShowing && parentView.windowToken != null) {
                    setBackgroundDrawable(ColorDrawable(Color.TRANSPARENT))
                    showAtLocation(parentView, Gravity.NO_GRAVITY, 0, 0)
                }
            }
        }

        fun getPopHeight(): Int {
            return if (isAtLeastSdkR) 0 else contentView.height
        }
    }

    var observer: ((Int, Int) -> Unit)? = null

    private val assistPopupWindow by lazy(LazyThreadSafetyMode.NONE) {
        AssistPopupWindow(context, parentView)
    }

    private var lastKeyboardHeight = 0

    private var currentKeyboardHeight = 0

    init {
        if (!isAtLeastSdkR) {
            contentView = Space(context).also {
                it.viewTreeObserver.addOnGlobalLayoutListener(this)
            }
            softInputMode = WindowManager.LayoutParams.SOFT_INPUT_ADJUST_RESIZE or
                    WindowManager.LayoutParams.SOFT_INPUT_STATE_ALWAYS_VISIBLE
            inputMethodMode = INPUT_METHOD_NEEDED
            width = 0
            height = WindowManager.LayoutParams.MATCH_PARENT
        }
    }

    override fun onGlobalLayout() {
        if (!isAtLeastSdkR) {
            handleOnGlobalLayout()
        }
    }

    fun isShowKeyboard() = currentKeyboardHeight > 120

    fun lastIsShowKeyboard() = lastKeyboardHeight > 120

    @SuppressLint("NewApi")
    fun start() {
        if (isAtLeastSdkR) {
            (context as Activity).window.decorView.setOnApplyWindowInsetsListener { _, insets ->
                insets.getInsets(WindowInsets.Type.navigationBars()).bottom.run {
                    handlerDispatchEvent(insets.getInsets(WindowInsets.Type.ime()).bottom.minus(this))
                    insets.inset(0, 0, 0, this)
                }
            }
        } else {
            if (!isShowing && parentView.windowToken != null) {
                setBackgroundDrawable(ColorDrawable(Color.TRANSPARENT))
                showAtLocation(parentView, Gravity.NO_GRAVITY, 0, 0)
                assistPopupWindow.start()
            }
        }
    }

    @SuppressLint("NewApi")
    fun close() {
        observer = null
        if (isAtLeastSdkR) {
            (context as Activity).window.decorView.setOnApplyWindowInsetsListener(null)
        } else {
            contentView.viewTreeObserver.removeOnGlobalLayoutListener(this)
            dismiss()
            assistPopupWindow.dismiss()
        }
    }

    private fun handleOnGlobalLayout() {
        val contentHeight = contentView.height
        if (contentHeight <= 0) {
            return // 忽略无需处理
        }
        val offset = assistPopupWindow.getPopHeight().minus(contentHeight)
        val open = offset > context.dip(100f)
        val newHeight = if (open) {
            offset
        } else {
            0
        }
        handlerDispatchEvent(newHeight)
    }

    private fun handlerDispatchEvent(height: Int) {
        val newHeight = height.coerceAtLeast(0)
        if (currentKeyboardHeight == newHeight) {
            return
        }
        lastKeyboardHeight = currentKeyboardHeight
        val orientation = context.resources.configuration.orientation
        if (newHeight < 120) {
            currentKeyboardHeight = 0
            notifyKeyboardHeightChanged(0, orientation)
        } else {
            currentKeyboardHeight = newHeight
            notifyKeyboardHeightChanged(newHeight, orientation)
        }
    }

    private fun notifyKeyboardHeightChanged(height: Int, orientation: Int) {
        observer?.invoke(height, orientation)
    }
}

[wsdydeni]

@Kuki93 大佬，看到你的微信切换表情面板，又看到你这个，方案没有特别大的问题，就是有些手机无法监听，同事的俩台手机就不行，型号华为Mate40系统鸿蒙2.0.0/型号红米Note9pro系统Android11

[qingkouwei]

这个兼容性问题最后有解吗？

[happyfire]

@Kuki93 大佬，看到你的微信切换表情面板，又看到你这个，方案没有特别大的问题，就是有些手机无法监听，同事的俩台手机就不行，型号华为Mate40系统鸿蒙2.0.0/型号红米Note9pro系统Android11

Android11的系统，按照KuKi03的代码应该使用的是WindowInsetsListener，这个难道不兼容？

[happyfire]

微信这个功能刚出来的时候，我也研究过它的键盘表情切换动画，这里我给出我的实现键盘高度计算的方法，目前没发现有兼容性问题 @FreddyChen

class KeyboardChangeMonitor(
private val context: Context,
private val parentView: View
) : PopupWindow(context), ViewTreeObserver.OnGlobalLayoutListener {

private val isAtLeastSdkR = Build.VERSION.SDK_INT >= Build.VERSION_CODES.R

class AssistPopupWindow(
    context: Context,
    private val parentView: View
) : PopupWindow(context) {

    private val isAtLeastSdkR = Build.VERSION.SDK_INT >= Build.VERSION_CODES.R

    init {
        if (!isAtLeastSdkR) {
            contentView = Space(context)
            softInputMode = WindowManager.LayoutParams.SOFT_INPUT_ADJUST_NOTHING
            width = 0
            height = WindowManager.LayoutParams.MATCH_PARENT
        }
    }

    fun start() {
        if (!isAtLeastSdkR) {
            if (!isShowing && parentView.windowToken != null) {
                setBackgroundDrawable(ColorDrawable(Color.TRANSPARENT))
                showAtLocation(parentView, Gravity.NO_GRAVITY, 0, 0)
            }
        }
    }

    fun getPopHeight(): Int {
        return if (isAtLeastSdkR) 0 else contentView.height
    }
}

var observer: ((Int, Int) -> Unit)? = null

private val assistPopupWindow by lazy(LazyThreadSafetyMode.NONE) {
    AssistPopupWindow(context, parentView)
}

private var lastKeyboardHeight = 0

private var currentKeyboardHeight = 0

init {
    if (!isAtLeastSdkR) {
        contentView = Space(context).also {
            it.viewTreeObserver.addOnGlobalLayoutListener(this)
        }
        softInputMode = WindowManager.LayoutParams.SOFT_INPUT_ADJUST_RESIZE or
                WindowManager.LayoutParams.SOFT_INPUT_STATE_ALWAYS_VISIBLE
        inputMethodMode = INPUT_METHOD_NEEDED
        width = 0
        height = WindowManager.LayoutParams.MATCH_PARENT
    }
}

override fun onGlobalLayout() {
    if (!isAtLeastSdkR) {
        handleOnGlobalLayout()
    }
}

fun isShowKeyboard() = currentKeyboardHeight > 120

fun lastIsShowKeyboard() = lastKeyboardHeight > 120

@SuppressLint("NewApi")
fun start() {
    if (isAtLeastSdkR) {
        (context as Activity).window.decorView.setOnApplyWindowInsetsListener { _, insets ->
            insets.getInsets(WindowInsets.Type.navigationBars()).bottom.run {
                handlerDispatchEvent(insets.getInsets(WindowInsets.Type.ime()).bottom.minus(this))
                insets.inset(0, 0, 0, this)
            }
        }
    } else {
        if (!isShowing && parentView.windowToken != null) {
            setBackgroundDrawable(ColorDrawable(Color.TRANSPARENT))
            showAtLocation(parentView, Gravity.NO_GRAVITY, 0, 0)
            assistPopupWindow.start()
        }
    }
}

@SuppressLint("NewApi")
fun close() {
    observer = null
    if (isAtLeastSdkR) {
        (context as Activity).window.decorView.setOnApplyWindowInsetsListener(null)
    } else {
        contentView.viewTreeObserver.removeOnGlobalLayoutListener(this)
        dismiss()
        assistPopupWindow.dismiss()
    }
}

private fun handleOnGlobalLayout() {
    val contentHeight = contentView.height
    if (contentHeight <= 0) {
        return // 忽略无需处理
    }
    val offset = assistPopupWindow.getPopHeight().minus(contentHeight)
    val open = offset > context.dip(100f)
    val newHeight = if (open) {
        offset
    } else {
        0
    }
    handlerDispatchEvent(newHeight)
}

private fun handlerDispatchEvent(height: Int) {
    val newHeight = height.coerceAtLeast(0)
    if (currentKeyboardHeight == newHeight) {
        return
    }
    lastKeyboardHeight = currentKeyboardHeight
    val orientation = context.resources.configuration.orientation
    if (newHeight < 120) {
        currentKeyboardHeight = 0
        notifyKeyboardHeightChanged(0, orientation)
    } else {
        currentKeyboardHeight = newHeight
        notifyKeyboardHeightChanged(newHeight, orientation)
    }
}

private fun notifyKeyboardHeightChanged(height: Int, orientation: Int) {
    observer?.invoke(height, orientation)
}

}

我在三星A13上测试，应该直接返回ime的bottom，如果减去navigationBars的高度反而不对。A13显示导航栏时，会回调两次，第一次导航栏高度为0，第二次为正常高度，第二次回调里面如果减去导航栏高度就不对了。没有其他手机可以测试