所以，在花了很长一段时间摆弄accesessibilityservices、窗口嵌入、屏幕高度检测等之后，我想我找到了一种方法来做到这一点。

免责声明:它在Android中使用了一个隐藏的方法，这意味着它可能不一致。然而，在我的测试中，它似乎有效。

该方法是InputMethodManager#getInputMethodWindowVisibleHeight()，它自Lollipop(5.0)以来就存在了。

调用它将返回当前键盘的高度(以像素为单位)。理论上，键盘不应该是0像素高，所以我做了一个简单的高度检查(在Kotlin中):

val imm by lazy { context.getSystemService(Context.INPUT_METHOD_SERVICE) as InputMethodManager }
if (imm.inputMethodWindowVisibleHeight > 0) {
    //keyboard is shown
else {
    //keyboard is hidden
}

当我调用隐藏方法时，我使用Android隐藏API来避免反射(我为我开发的应用程序做了很多，这些应用程序主要是hack /tuner应用程序)，但这应该也是可能的反射:

val imm by lazy { context.getSystemService(Context.INPUT_METHOD_SERVICE) as InputMethodManager }
val windowHeightMethod = InputMethodManager::class.java.getMethod("getInputMethodWindowVisibleHeight")
val height = windowHeightMethod.invoke(imm) as Int
//use the height val in your logic

这是如何在一个片段中使用软键盘状态监听器(适用于API 21及以上)

    private var currentWindowInsets: WindowInsetsCompat = WindowInsetsCompat.Builder().build()

    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
        super.onViewCreated(view, savedInstanceState)
        setWindowInsetsAnimationCallback(requireView().rootView, object : Callback(DISPATCH_MODE_CONTINUE_ON_SUBTREE) {
            override fun onProgress(insets: WindowInsetsCompat, runningAnimations: MutableList<WindowInsetsAnimationCompat>): WindowInsetsCompat {
                currentWindowInsets = insets
                return insets
            }
    
            override fun onEnd(animation: WindowInsetsAnimationCompat) {
                super.onEnd(animation)
                val keyboardIsVisible = currentWindowInsets.isVisible(WindowInsetsCompat.Type.ime())
                if (keyboardIsVisible) { //do your stuff }
            }
        })
    }

我也遇到过类似的问题。我需要对屏幕上的Enter按钮做出反应(这隐藏了键盘)。在这种情况下，你可以订阅键盘打开的文本视图的OnEditorAction -如果你有多个可编辑框，那么就订阅所有的文本视图。

在你的活动中，你可以完全控制键盘，所以如果你监听所有打开和关闭事件，你就不会面临键盘是否打开的问题。

我把答案转换为kotlin，希望这对kotlin用户有帮助。

private fun checkKeyboardVisibility() {
    var isKeyboardShowing = false

    binding.coordinator.viewTreeObserver.addOnGlobalLayoutListener {
        val r = Rect()
        binding.coordinator.getWindowVisibleDisplayFrame(r)
        val screenHeight = binding.coordinator.rootView.height

        // r.bottom is the position above soft keypad or device button.
        // if keypad is shown, the r.bottom is smaller than that before.
        val keypadHeight = screenHeight - r.bottom


        if (keypadHeight > screenHeight * 0.15) { // 0.15 ratio is perhaps enough to determine keypad height.
            // keyboard is opened
            if (!isKeyboardShowing) {
                isKeyboardShowing = true

            }
        } else {
            // keyboard is closed
            if (isKeyboardShowing) {
                isKeyboardShowing = false

            }
        }
    }
}

如你所知，android软件的键盘只有在有可能的输入事件时才可见。换句话说，只有当EditText被聚焦时，键盘才可见。这意味着你可以通过使用OnFocusChangeListener获得键盘是否可见。

//Declare this Globally

public boolean isKeyBoardVisible = false;

//In OnCreate *[For Activity]*, OnCreateView *[For Fragment]*

text_send.setOnFocusChangeListener(new View.OnFocusChangeListener() {

    @Override
    public void onFocusChange(View v, boolean hasFocus) {
        if(hasFocus)
            isKeyBoardVisible = true;
        else
            isKeyBoardVisible = false;
    }
});

现在你可以在类的任何地方使用isKeyBoardVisible变量来获取键盘是否打开。这对我来说很有效。

注意:当使用InputMethodManager以编程方式打开键盘时，这个过程不起作用，因为它不调用OnFocusChangeListener。

它使用活动的adjustNothing标志和使用生命周期事件。还有Kotlin:

/**
 * This class uses a PopupWindow to calculate the window height when the floating keyboard is opened and closed
 *
 * @param activity The parent activity
 *  The root activity that uses this KeyboardManager
 */
class KeyboardManager(private val activity: AppCompatActivity) : PopupWindow(activity), LifecycleObserver {

    private var observerList = mutableListOf<((keyboardTop: Int) -> Unit)>()

    /** The last value of keyboardTop */
    private var keyboardTop: Int = 0

    /** The view that is used to calculate the keyboard top  */
    private val popupView: View?

    /** The parent view  */
    private var parentView: View

    var isKeyboardShown = false
        private set

    /**
     * Create transparent view which will be stretched over to the full screen
     */
    private fun createFullScreenView(): View {
        val view = LinearLayout(activity)
        view.layoutParams = LinearLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT,
                ViewGroup.LayoutParams.MATCH_PARENT)
        view.background = ColorDrawable(Color.TRANSPARENT)
        return view
    }

    init {
        this.popupView = createFullScreenView()
        contentView = popupView

        softInputMode = LayoutParams.SOFT_INPUT_ADJUST_RESIZE or LayoutParams.SOFT_INPUT_STATE_ALWAYS_VISIBLE
        inputMethodMode = INPUT_METHOD_NEEDED

        parentView = activity.findViewById(android.R.id.content)

        width = 0
        height = LayoutParams.MATCH_PARENT

        popupView.viewTreeObserver.addOnGlobalLayoutListener {
            val rect = Rect()
            popupView.getWindowVisibleDisplayFrame(rect)

            val keyboardTop = rect.bottom
            if (this.keyboardTop != keyboardTop) {
                isKeyboardShown = keyboardTop < this.keyboardTop
                this.keyboardTop = keyboardTop
                observerList.forEach { it(keyboardTop) }
            }
        }
        activity.lifecycle.addObserver(this)
    }

    /**
     * This must be called after the onResume of the Activity or inside view.post { } .
     * PopupWindows are not allowed to be registered before the onResume has finished
     * of the Activity
     */
    @OnLifecycleEvent(Lifecycle.Event.ON_RESUME)
    fun start() {
        parentView.post {
            if (!isShowing && parentView.windowToken != null) {
                setBackgroundDrawable(ColorDrawable(0))
                showAtLocation(parentView, Gravity.NO_GRAVITY, 0, 0)
            }
        }
    }

    /**
     * This manager will not be used anymore
     */
    @OnLifecycleEvent(Lifecycle.Event.ON_DESTROY)
    fun close() {
        activity.lifecycle.removeObserver(this)
        observerList.clear()
        dismiss()
    }

    /**
     * Set the keyboard top observer. The observer will be notified when the keyboard top has changed.
     * For example when the keyboard is opened or closed
     *
     * @param observer The observer to be added to this provider
     */
    fun registerKeyboardTopObserver(observer: (keyboardTop: Int) -> Unit) {
        observerList.add(observer)
    }
}

有用的方法，保持视图始终高于键盘

fun KeyboardManager.updateBottomMarginIfKeyboardShown(
        view: View,
        activity: AppCompatActivity,
        // marginBottom of view when keyboard is hide
        marginBottomHideKeyboard: Int,
        // marginBottom of view when keybouard is shown
        marginBottomShowKeyboard: Int
) {
    registerKeyboardTopObserver { bottomKeyboard ->
        val bottomView = ViewUtils.getFullViewBounds(view).bottom
        val maxHeight = ScreenUtils.getFullScreenSize(activity.windowManager).y
        // Check that view is within the window size
        if (bottomView < maxHeight) {
            if (bottomKeyboard < bottomView) {
                ViewUtils.updateMargin(view, bottomMargin = bottomView - bottomKeyboard +
                        view.marginBottom + marginBottomShowKeyboard)
            } else ViewUtils.updateMargin(view, bottomMargin = marginBottomHideKeyboard)
        }
    }
}

在getFullViewBounds

fun getLocationOnScreen(view: View): Point {
    val location = IntArray(2)
    view.getLocationOnScreen(location)
    return Point(location[0], location[1])
}

fun getFullViewBounds(view: View): Rect {
     val location = getLocationOnScreen(view)
     return Rect(location.x, location.y, location.x + view.width,
            location.y + view.height)
 }

在getFullScreenSize

fun getFullScreenSize(wm: WindowManager? = null) =
            getScreenSize(wm) { getRealSize(it) }

private fun getScreenSize(wm: WindowManager? = null, block: Display.(Point) -> Unit): Point {
    val windowManager = wm ?: App.INSTANCE.getSystemService(Context.WINDOW_SERVICE)
            as WindowManager
    val point = Point()
    windowManager.defaultDisplay.block(point)
    return point
}

其中更新边距

fun updateMargin(
        view: View,
        leftMargin: Int? = null,
        topMargin: Int? = null,
        rightMargin: Int? = null,
        bottomMargin: Int? = null
) {
    val layoutParams = view.layoutParams as ViewGroup.MarginLayoutParams
    if (leftMargin != null) layoutParams.leftMargin = leftMargin
    if (topMargin != null) layoutParams.topMargin = topMargin
    if (rightMargin != null) layoutParams.rightMargin = rightMargin
    if (bottomMargin != null) layoutParams.bottomMargin = bottomMargin
    view.layoutParams = layoutParams
}