我需要做一件非常简单的事情-找出软件键盘是否显示。这在Android中可行吗?
当前回答
参考@TacB0sS的回答,我在Kotlin中开发了一个类。希望这对你有所帮助。如果需要改进,请告诉我。
class KeyboardVisibilityObserver(val layRootContainer: View?, val keyboardVisibilityListener: KeyboardVisibilityListener?) {
var isKeyboardOpen = false
private set
private var keyBoardObserver = object : ViewTreeObserver.OnGlobalLayoutListener {
private val DefaultKeyboardDP = 100
// Lollipop includes button bar in the root. Add height of button bar (48dp) to maxDiff
private val EstimatedKeyboardDP = DefaultKeyboardDP + if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) 48 else 0
private val r = Rect()
override fun onGlobalLayout() {
if (layRootContainer != null) {
// Convert the dp to pixels.
val estimatedKeyboardHeight = TypedValue
.applyDimension(TypedValue.COMPLEX_UNIT_DIP, EstimatedKeyboardDP.toFloat(), layRootContainer.resources.displayMetrics).toInt()
// Conclude whether the keyboard is shown or not.
layRootContainer.getWindowVisibleDisplayFrame(r)
val heightDiff = layRootContainer.rootView.height - (r.bottom - r.top)
val isShown = heightDiff >= estimatedKeyboardHeight
if (isShown == isKeyboardOpen) {
// Log.d("Keyboard state", "Ignoring global layout change...");
return
}
isKeyboardOpen = isShown
keyboardVisibilityListener?.onKeyboardVisibilityChanged(isKeyboardOpen)
}
}
}
init {
layRootContainer?.viewTreeObserver?.addOnGlobalLayoutListener(keyBoardObserver)
}
// call this in onDestroy
fun removeObserver(){
layRootContainer?.viewTreeObserver?.removeOnGlobalLayoutListener(keyBoardObserver)
}
interface KeyboardVisibilityListener {
fun onKeyboardVisibilityChanged(isKeyboardOpen: Boolean)
}
}
其他回答
哇,安卓极客们有好消息了。是时候向旧的方式说再见了。 首先我将添加官方发布说明来阅读和了解更多关于这些方法/类,然后我们将看到这些神奇的方法/类
注意:在这些类/方法发布之前,不要将它们添加到你的发布应用中
如何检查键盘可见性
val insets = ViewCompat.getRootWindowInsets(view)
val isKeyboardVisible = insets.isVisible(Type.ime())
其他用途很少
如何获取键盘的高度
val insets = ViewCompat.getRootWindowInsets(view)
val keyboardHeight = insets.getInsets(Type.ime()).bottom
如何显示/隐藏键盘
val controller = view.windowInsetsController
// Show the keyboard
controller.show(Type.ime())
// Hide the keyboard
controller.hide(Type.ime())
注意:WindowInsetsController是在API-30中添加的,所以要等到向后兼容类不可用。
如何听键盘隐藏/显示事件
ViewCompat.setOnApplyWindowInsetsListener(view) { v, insets ->
val isKeyboardVisible = insets.isVisible(Type.ime())
if (isKeyboardVisible) {
// Do it when keyboard is being shown
} else {
// Do it when keyboard is hidden
}
// Return the insets to keep going down this event to the view hierarchy
insets
}
医生说… https://developer.android.com/reference/androidx/core/view/WindowInsetsCompat
检查放行说明.. https://developer.android.com/jetpack/androidx/releases/core#1.5.0-alpha02
要获得当前键盘可见性,可以使用getRootWindowInsets,然后调用isVisible()函数,传入IME类型。
val windowinsetscompat = ViewCompat.getRootWindowInsets(view)
val imeVisible = windowinsetscompat.isVisible(Type.ime())
也有监听OnApplyWindowInsetsListener的变化
ViewCompat.setOnApplyWindowInsetsListener(view) { v, insets ->
val imeVisible = insets.isVisible(Type.ime())
}
就计算机而言,这是永远的问题,但这个问题仍然令人难以置信地相关!
所以我把上面的答案结合起来,做了一些改进……
public interface OnKeyboardVisibilityListener {
void onVisibilityChanged(boolean visible);
}
public final void setKeyboardListener(final OnKeyboardVisibilityListener listener) {
final View activityRootView = ((ViewGroup) getActivity().findViewById(android.R.id.content)).getChildAt(0);
activityRootView.getViewTreeObserver().addOnGlobalLayoutListener(new OnGlobalLayoutListener() {
private boolean wasOpened;
private final int DefaultKeyboardDP = 100;
// From @nathanielwolf answer... Lollipop includes button bar in the root. Add height of button bar (48dp) to maxDiff
private final int EstimatedKeyboardDP = DefaultKeyboardDP + (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP ? 48 : 0);
private final Rect r = new Rect();
@Override
public void onGlobalLayout() {
// Convert the dp to pixels.
int estimatedKeyboardHeight = (int) TypedValue
.applyDimension(TypedValue.COMPLEX_UNIT_DIP, EstimatedKeyboardDP, activityRootView.getResources().getDisplayMetrics());
// Conclude whether the keyboard is shown or not.
activityRootView.getWindowVisibleDisplayFrame(r);
int heightDiff = activityRootView.getRootView().getHeight() - (r.bottom - r.top);
boolean isShown = heightDiff >= estimatedKeyboardHeight;
if (isShown == wasOpened) {
Log.d("Keyboard state", "Ignoring global layout change...");
return;
}
wasOpened = isShown;
listener.onVisibilityChanged(isShown);
}
});
}
对我有用:)
注意: 如果你注意到DefaultKeyboardDP不适合你的设备播放的值,并发表评论,让每个人都知道应该是什么值…最终我们将得到适合所有设备的正确值!
要了解更多细节,请查看Cyborg上的实现
有一种直接的方法可以找出答案。而且,它不需要任何布局更改。 所以,它也可以在沉浸式全屏模式下工作。 诀窍在于,您尝试隐藏或显示软键盘,并捕获尝试的结果。 没有恐慌,这并不真正显示或隐藏键盘。我们只要求状态。 为了保持最新,您可以简单地重复操作,例如,每200毫秒,使用处理器。 您可以在这里找到一个实现:https://stackoverflow.com/a/27567074/2525452
也有解决方案与系统嵌入,但它只适用于API >= 21 (Android L)。说你有BottomNavigationView,这是线性布局的孩子,你需要隐藏它时,键盘显示:
> LinearLayout
> ContentView
> BottomNavigationView
你所需要做的就是以这样的方式扩展LinearLayout:
public class KeyboardAwareLinearLayout extends LinearLayout {
public KeyboardAwareLinearLayout(Context context) {
super(context);
}
public KeyboardAwareLinearLayout(Context context, @Nullable AttributeSet attrs) {
super(context, attrs);
}
public KeyboardAwareLinearLayout(Context context,
@Nullable AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
}
public KeyboardAwareLinearLayout(Context context, AttributeSet attrs,
int defStyleAttr, int defStyleRes) {
super(context, attrs, defStyleAttr, defStyleRes);
}
@Override
public WindowInsets onApplyWindowInsets(WindowInsets insets) {
int childCount = getChildCount();
for (int index = 0; index < childCount; index++) {
View view = getChildAt(index);
if (view instanceof BottomNavigationView) {
int bottom = insets.getSystemWindowInsetBottom();
if (bottom >= ViewUtils.dpToPx(200)) {
// keyboard is shown
view.setVisibility(GONE);
} else {
// keyboard is hidden
view.setVisibility(VISIBLE);
}
}
}
return insets;
}
}
这个想法是,当键盘显示时,系统insets被改变为相当大的.bottom值。
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