Android系统中是否有一种方法可以检测软件(也就是Android。“软”)键盘在屏幕上可见吗?
当前回答
我写了样本。
这个存储库可以帮助检测键盘状态,而无需假设“键盘应该超过屏幕的X部分”。
其他回答
There is a direct method to find this out. And, it does not require the layout changes. So it works in immersive fullscreen mode, too. But, unfortunately, it does not work on all devices. So you have to test it with your device(s). The trick is that you try to hide or show the soft keyboard and capture the result of that try. If it works correct then the keyboard is not really shown or hidden. We just ask for the state. To stay up-to-date, you simply repeat this operation, e.g. every 200 milliseconds, using a Handler. The implementation below does just a single check. If you do multiple checks, then you should enable all the (_keyboardVisible) tests.
public interface OnKeyboardShowHide
{
void onShowKeyboard( Object param );
void onHideKeyboard( Object param );
}
private static Handler _keyboardHandler = new Handler();
private boolean _keyboardVisible = false;
private OnKeyboardShowHide _keyboardCallback;
private Object _keyboardCallbackParam;
public void start( OnKeyboardShowHide callback, Object callbackParam )
{
_keyboardCallback = callback;
_keyboardCallbackParam = callbackParam;
//
View view = getCurrentFocus();
if (view != null)
{
InputMethodManager imm = (InputMethodManager) getSystemService( Activity.INPUT_METHOD_SERVICE );
imm.hideSoftInputFromWindow( view.getWindowToken(), InputMethodManager.HIDE_IMPLICIT_ONLY, _keyboardResultReceiver );
imm.showSoftInput( view, InputMethodManager.SHOW_IMPLICIT, _keyboardResultReceiver );
}
else // if (_keyboardVisible)
{
_keyboardVisible = false;
_keyboardCallback.onHideKeyboard( _keyboardCallbackParam );
}
}
private ResultReceiver _keyboardResultReceiver = new ResultReceiver( _keyboardHandler )
{
@Override
protected void onReceiveResult( int resultCode, Bundle resultData )
{
switch (resultCode)
{
case InputMethodManager.RESULT_SHOWN :
case InputMethodManager.RESULT_UNCHANGED_SHOWN :
// if (!_keyboardVisible)
{
_keyboardVisible = true;
_keyboardCallback.onShowKeyboard( _keyboardCallbackParam );
}
break;
case InputMethodManager.RESULT_HIDDEN :
case InputMethodManager.RESULT_UNCHANGED_HIDDEN :
// if (_keyboardVisible)
{
_keyboardVisible = false;
_keyboardCallback.onHideKeyboard( _keyboardCallbackParam );
}
break;
}
}
};
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
}
我通过设置一个GlobalLayoutListener来做到这一点,如下所示:
final View activityRootView = findViewById(R.id.activityRoot);
activityRootView.getViewTreeObserver().addOnGlobalLayoutListener(
new OnGlobalLayoutListener() {
@Override
public void onGlobalLayout() {
int heightView = activityRootView.getHeight();
int widthView = activityRootView.getWidth();
if (1.0 * widthView / heightView > 3) {
//Make changes for Keyboard not visible
} else {
//Make changes for keyboard visible
}
}
});
在Android中,你可以通过ADB shell进行检测。我写下并使用了这个方法:
{
JSch jsch = new JSch();
try {
Session session = jsch.getSession("<userName>", "<IP>", 22);
session.setPassword("<Password>");
Properties config = new Properties();
config.put("StrictHostKeyChecking", "no");
session.setConfig(config);
session.connect();
ChannelExec channel = (ChannelExec)session.openChannel("exec");
BufferedReader in = new BufferedReader(new
InputStreamReader(channel.getInputStream()));
channel.setCommand("C:/Android/android-sdk/platform-tools/adb shell dumpsys window
InputMethod | findstr \"mHasSurface\"");
channel.connect();
String msg = null;
String msg2 = " mHasSurface=true";
while ((msg = in.readLine()) != null) {
Boolean isContain = msg.contains(msg2);
log.info(isContain);
if (isContain){
log.info("Hiding keyboard...");
driver.hideKeyboard();
}
else {
log.info("No need to hide keyboard.");
}
}
channel.disconnect();
session.disconnect();
} catch (JSchException | IOException | InterruptedException e) {
e.printStackTrace();
}
}
}
一个基于@bohdan-oliynyk答案的更紧凑的Kotlin版本
private const val KEYBOARD_VISIBLE_THRESHOLD_DP = 100
fun Activity.isKeyboardOpen(): Boolean {
fun convertDpToPx(value: Int): Int =
(value * Resources.getSystem().displayMetrics.density).toInt()
val rootView = findViewById<View>(android.R.id.content)
val visibleThreshold = Rect()
rootView.getWindowVisibleDisplayFrame(visibleThreshold)
val heightDiff = rootView.height - visibleThreshold.height()
val accessibleValue = convertDpToPx(KEYBOARD_VISIBLE_THRESHOLD_DP)
return heightDiff > accessibleValue
}
fun Activity.isKeyboardClosed(): Boolean {
return isKeyboardOpen().not()
}
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