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
检查元素的高度是不可靠的,因为一些键盘,如WifiKeyboard的高度为零。
相反,您可以使用showSoftInput()和hideSoftInput()的回调结果来检查键盘的状态。完整的细节和示例代码在
https://rogerkeays.com/how-to-check-if-the-software-keyboard-is-shown-in-android
其他回答
在了解了不同分辨率的一些问题后,我决定使用相对大小。正如我所注意到的,可见状态和隐藏状态之间的差异约为30%。所以我决定用0.3代替128 PX。
我添加了这个类监听器来通知任何变化。
这是我的版本
import android.app.*;
import android.graphics.*;
import android.view.*;
public class SoftKeyboardState {
public static final int HIDDEN = 0, VISIBLE = 1;
private OnKeyboardStateChangedListener listener;
private View decorView;
public SoftKeyboardState(Activity activity) {
this.decorView = activity.findViewById(android.R.id.content);
initKeyboardListener();
}
private void initKeyboardListener() {
decorView.getViewTreeObserver().addOnGlobalLayoutListener(
new ViewTreeObserver.OnGlobalLayoutListener(){
private final Rect windowVisibleDisplayFrame = new Rect();
private int lastVisibleDecorViewHeight;
@Override
public void onGlobalLayout() {
decorView.getWindowVisibleDisplayFrame(windowVisibleDisplayFrame);
final int visibleDecorViewHeight = windowVisibleDisplayFrame.height();
if (lastVisibleDecorViewHeight != 0) {
if ((lastVisibleDecorViewHeight > visibleDecorViewHeight) && (lastVisibleDecorViewHeight / visibleDecorViewHeight >= 0.3f)) {
// visible
if (listener != null)listener.onKeyboardStateChanged(VISIBLE);
} else if ((lastVisibleDecorViewHeight < visibleDecorViewHeight) && (visibleDecorViewHeight / lastVisibleDecorViewHeight >= 0.3f)) {
// hidden
if (listener != null)listener.onKeyboardStateChanged(HIDDEN);
}
}
lastVisibleDecorViewHeight = visibleDecorViewHeight;
}
});
}
public void setOnKeyboardStateChangedListener(OnKeyboardStateChangedListener listener) {
this.listener = listener;
}
public interface OnKeyboardStateChangedListener {
public void onKeyboardStateChanged(int state);
}
}
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
}
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
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。
我发现@Reuben_Scratton的方法与@Yogesh的方法的组合似乎效果最好。将他们的方法结合起来会产生如下结果:
final View activityRootView = findViewById(R.id.activityRoot);
activityRootView.getViewTreeObserver().addOnGlobalLayoutListener(new OnGlobalLayoutListener() {
@Override
public void onGlobalLayout() {
if (getResources().getConfiguration().keyboardHidden == Configuration.KEYBOARDHIDDEN_NO) { // Check if keyboard is not hidden
// ... do something here
}
}
});
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