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
我知道如何准确地确定键盘是否隐藏。
public int getStatusBarHeight() {
int result = 0;
int resourceId = getResources().getIdentifier("status_bar_height", "dimen", "android");
if (resourceId > 0) {
result = getResources().getDimensionPixelSize(resourceId);
}
return result;
}
public int getNavigationBarHeight() {
int result = 0;
int resourceId = getResources().getIdentifier("navigation_bar_height", "dimen", "android");
if (resourceId > 0) {
result = getResources().getDimensionPixelSize(resourceId);
}
return result;
}
public boolean isKeyboardHidden() {
int delta = mRootView.getRootView().getHeight() - mRootView.getHeight() - getNavigationBarHeight() - getStatusBarHeight()
- getSupportActionBar().getHeight();
return delta <= 0;
}
这适用于平板电脑。当导航栏水平显示时。
其他回答
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)
}
}
这里有一个工作区,以了解软键盘是否可见。
检查系统上正在运行的服务 ActivityManager.getRunningServices (max_count_of_services); 从返回的ActivityManager。运行ningserviceinfo实例,检查软键盘服务的clientCount值。 前面提到的clientCount将在每次显示软键盘时递增。例如,如果clientCount为 一开始是1,显示键盘时是2。 在键盘撤销时,clientCount递减。在本例中,它重置为1。
一些流行的键盘在它们的classname中有特定的关键字:
Google AOSP = IME
Swype = IME
Swiftkey = KeyboardService
Fleksy = keyboard
Adaptxt = IME (KPTAdaptxtIME)
Smart = Keyboard (SmartKeyboard)
从ActivityManager。RunningServiceInfo,在ClassNames中检查上述模式。同时,ActivityManager。RunningServiceInfo的clientPackage=android,表示键盘绑定到系统。
可以将上述信息进行严格的组合,以判断软键盘是否可见。
希望这能帮助到大家。
Reuben Scratton给出的新答案非常棒,而且非常有效,但它只在你将windowSoftInputMode设置为adjuststresize时才有效。如果你将它设置为adjustPan,使用他的代码片段仍然无法检测键盘是否可见。为了解决这个问题,我对上面的代码做了微小的修改。
final View activityRootView = findViewById(R.id.activityRoot);
activityRootView.getViewTreeObserver().addOnGlobalLayoutListener(new OnGlobalLayoutListener() {
@Override
public void onGlobalLayout() {
Rect r = new Rect();
//r will be populated with the coordinates of your view that area still visible.
activityRootView.getWindowVisibleDisplayFrame(r);
int heightDiff = activityRootView.getRootView().getHeight() - r.height();
if (heightDiff > 0.25*activityRootView.getRootView().getHeight()) { // if more than 25% of the screen, its probably a keyboard...
... do something here
}
}
});
这个解决方案可能会重新打开键盘,但它是有效的。
InputMethodManager inputManager = ( (InputMethodManager) this.getSystemService(Context.INPUT_METHOD_SERVICE) );
private boolean isKeyboardShowing() {
boolean isKeyboardShowing = inputManager.hideSoftInputFromWindow(irrelevantView.getWindowToken(), 0);
if (isKeyboardShowing) {
inputManager.showSoftInput(this.getCurrentFocus(), 0);
}
return isKeyboardShowing;
}
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
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