我有一个Activity
,其中有5个EditText
。当用户单击第一个EditText
时,软键盘会打开以在其中输入一些值。当软键盘打开并且用户单击第一个EditText
,以及当软键盘从同一个EditText
通过返回按钮关闭时,我想将其他一些View
的可见性设置为Gone
。然后,我希望将另一些View
的可见性设置为可见。
在Android中,是否有任何侦听器、回调或任何技巧可以在从单击第一个EditText
打开软键盘时使用?
我有一个Activity
,其中有5个EditText
。当用户单击第一个EditText
时,软键盘会打开以在其中输入一些值。当软键盘打开并且用户单击第一个EditText
,以及当软键盘从同一个EditText
通过返回按钮关闭时,我想将其他一些View
的可见性设置为Gone
。然后,我希望将另一些View
的可见性设置为可见。
在Android中,是否有任何侦听器、回调或任何技巧可以在从单击第一个EditText
打开软键盘时使用?
使用强大的KeyboardVisibilityEvent库,轻松搞定。
KeyboardVisibilityEvent.setEventListener(
getActivity(),
new KeyboardVisibilityEventListener() {
@Override
public void onVisibilityChanged(boolean isOpen) {
// Ah... at last. do your thing :)
}
});
Yasuhiro SHIMIZU的制作人员名单
只有当您的活动在清单中设置为adjustResize
时,此方法才有效。
您可以使用布局侦听器来查看活动的根布局是否因键盘而调整大小。
我为自己的活动使用以下基类:
public class BaseActivity extends Activity {
private ViewTreeObserver.OnGlobalLayoutListener keyboardLayoutListener = new ViewTreeObserver.OnGlobalLayoutListener() {
@Override
public void onGlobalLayout() {
int heightDiff = rootLayout.getRootView().getHeight() - rootLayout.getHeight();
int contentViewTop = getWindow().findViewById(Window.ID_ANDROID_CONTENT).getTop();
LocalBroadcastManager broadcastManager = LocalBroadcastManager.getInstance(BaseActivity.this);
if(heightDiff <= contentViewTop){
onHideKeyboard();
Intent intent = new Intent("KeyboardWillHide");
broadcastManager.sendBroadcast(intent);
} else {
int keyboardHeight = heightDiff - contentViewTop;
onShowKeyboard(keyboardHeight);
Intent intent = new Intent("KeyboardWillShow");
intent.putExtra("KeyboardHeight", keyboardHeight);
broadcastManager.sendBroadcast(intent);
}
}
};
private boolean keyboardListenersAttached = false;
private ViewGroup rootLayout;
protected void onShowKeyboard(int keyboardHeight) {}
protected void onHideKeyboard() {}
protected void attachKeyboardListeners() {
if (keyboardListenersAttached) {
return;
}
rootLayout = (ViewGroup) findViewById(R.id.rootLayout);
rootLayout.getViewTreeObserver().addOnGlobalLayoutListener(keyboardLayoutListener);
keyboardListenersAttached = true;
}
@Override
protected void onDestroy() {
super.onDestroy();
if (keyboardListenersAttached) {
rootLayout.getViewTreeObserver().removeGlobalOnLayoutListener(keyboardLayoutListener);
}
}
}
以下示例演示如何在键盘显示时隐藏视图,并在键盘隐藏时再次显示它。<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/rootLayout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<ScrollView
android:id="@+id/scrollView"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1"
>
<!-- omitted for brevity -->
</ScrollView>
<LinearLayout android:id="@+id/bottomContainer"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
>
<!-- omitted for brevity -->
</LinearLayout>
</LinearLayout>
并且这个活动:
public class TestActivity extends BaseActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.test_activity);
attachKeyboardListeners();
}
@Override
protected void onShowKeyboard(int keyboardHeight) {
// do things when keyboard is shown
bottomContainer.setVisibility(View.GONE);
}
@Override
protected void onHideKeyboard() {
// do things when keyboard is hidden
bottomContainer.setVisibility(View.VISIBLE);
}
}
rootLayout = (ViewGroup) findViewById(R.id.rootLayout);
这段代码的? - CommonSenseCode正如Vikram在评论中指出的那样,检测软键盘是否已显示或已消失只能通过一些丑陋的技巧来实现。
也许只需在编辑文本上设置焦点监听器:
yourEditText.setOnFocusChangeListener(new OnFocusChangeListener() {
@Override
public void onFocusChange(View v, boolean hasFocus) {
if (hasFocus) {
//got focus
} else {
//lost focus
}
}
});
onFocusChange()
不会被调用。 - Manuel Allenspach对于活动:
final View activityRootView = findViewById(R.id.activityRoot);
activityRootView.getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
@Override
public void onGlobalLayout() {
Rect r = new Rect();
activityRootView.getWindowVisibleDisplayFrame(r);
int heightDiff = view.getRootView().getHeight() - (r.bottom - r.top);
if (heightDiff > 100) {
//enter your code here
}else{
//enter code for hid
}
}
});
对于Fragment:
view = inflater.inflate(R.layout.live_chat_fragment, null);
view.getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
@Override
public void onGlobalLayout() {
Rect r = new Rect();
//r will be populated with the coordinates of your view that area still visible.
view.getWindowVisibleDisplayFrame(r);
int heightDiff = view.getRootView().getHeight() - (r.bottom - r.top);
if (heightDiff > 500) { // if more than 100 pixels, its probably a keyboard...
}
}
});
android:windowSoftInputMode="adjustResize"
吗? - LiuWenbin_NO.像这样:
private ViewTreeObserver.OnGlobalLayoutListener keyboardLayoutListener = new ViewTreeObserver.OnGlobalLayoutListener() {
@Override
public void onGlobalLayout() {
// navigation bar height
int navigationBarHeight = 0;
int resourceId = getResources().getIdentifier("navigation_bar_height", "dimen", "android");
if (resourceId > 0) {
navigationBarHeight = getResources().getDimensionPixelSize(resourceId);
}
// status bar height
int statusBarHeight = 0;
resourceId = getResources().getIdentifier("status_bar_height", "dimen", "android");
if (resourceId > 0) {
statusBarHeight = getResources().getDimensionPixelSize(resourceId);
}
// display window size for the app layout
Rect rect = new Rect();
getWindow().getDecorView().getWindowVisibleDisplayFrame(rect);
// screen height - (user app height + status + nav) ..... if non-zero, then there is a soft keyboard
int keyboardHeight = rootLayout.getRootView().getHeight() - (statusBarHeight + navigationBarHeight + rect.height());
if (keyboardHeight <= 0) {
onHideKeyboard();
} else {
onShowKeyboard(keyboardHeight);
}
}
};
你可以尝试一下:
private void initKeyBoardListener() {
// Минимальное значение клавиатуры.
// Threshold for minimal keyboard height.
final int MIN_KEYBOARD_HEIGHT_PX = 150;
// Окно верхнего уровня view.
// Top-level window decor view.
final View decorView = getWindow().getDecorView();
// Регистрируем глобальный слушатель. Register global layout listener.
decorView.getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
// Видимый прямоугольник внутри окна.
// Retrieve visible rectangle inside window.
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 + MIN_KEYBOARD_HEIGHT_PX) {
Log.d("Pasha", "SHOW");
} else if (lastVisibleDecorViewHeight + MIN_KEYBOARD_HEIGHT_PX < visibleDecorViewHeight) {
Log.d("Pasha", "HIDE");
}
}
// Сохраняем текущую высоту view до следующего вызова.
// Save current decor view height for the next call.
lastVisibleDecorViewHeight = visibleDecorViewHeight;
}
});
}
我迟到了,但我刚刚发现了一个非常方便的依赖项。使用它,您可以检查键盘的可见性,并使用一行代码随时隐藏或显示键盘。
implementation 'net.yslibrary.keyboardvisibilityevent:keyboardvisibilityevent:3.0.0-RC2'
然后,您只需使用此代码段来检查键盘的可见性。
KeyboardVisibilityEvent.setEventListener(this, new KeyboardVisibilityEventListener() {
@Override
public void onVisibilityChanged(boolean isOpen) {
if (isOpen)
Toast.makeText(MainActivity.this, "keyboard opened",Toast.LENGTH_SHORT).show();
else
Toast.makeText(MainActivity.this, "keyboard hidden", Toast.LENGTH_SHORT).show();
}
});
如果您想在任何时候隐藏/显示键盘,那么您只需编写以下其中一行代码即可实现。
UIUtil.showKeyboard(this,edittext_to_be_focused);
UIUtil.hideKeyboard(this);
在 Kotlin 的 fragment 中使用是一种常见的用例,使用 KeyboardVisibilityEvent
库非常简单。
在 build.gradle 中:
implementation 'net.yslibrary.keyboardvisibilityevent:keyboardvisibilityevent:3.0.0-RC2'
在 Fragment 中:
activity?.let {
KeyboardVisibilityEvent.setEventListener(it,object: KeyboardVisibilityEventListener {
override fun onVisibilityChanged(isOpen: Boolean) {
if (isOpen) Toast.makeText(context,"Keyboard is opened",Toast.LENGTH_SHORT).show()
else Toast.makeText(context,"Keyboard is closed",Toast.LENGTH_SHORT).show()
}
})
}
if (!isOpen) {}
。 - F.MysirmainLayout.getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
@Override
public void onGlobalLayout() {
if (mainLayout != null) {
int heightDiff = mainLayout.getRootView().getHeight() - mainLayout.getHeight();
if (heightDiff > dpToPx(getActivity(), 200)) {
//keyboard is open
} else {
//keyboard is hide
}
}
}
});
/**
* @return [Observable] to subscribe of keyboard visibility changes.
*/
fun AppCompatActivity.keyboardVisibilityChanges(): Observable<Boolean> {
// flag indicates whether keyboard is open
var isKeyboardOpen = false
val notifier: BehaviorSubject<Boolean> = BehaviorSubject.create()
// approximate keyboard height
val approximateKeyboardHeight = dip(100)
// device screen height
val screenHeight: Int = getScreenHeight()
val visibleDisplayFrame = Rect()
val viewTreeObserver = window.decorView.viewTreeObserver
val onDrawListener = ViewTreeObserver.OnDrawListener {
window.decorView.getWindowVisibleDisplayFrame(visibleDisplayFrame)
val keyboardHeight = screenHeight - (visibleDisplayFrame.bottom - visibleDisplayFrame.top)
val keyboardOpen = keyboardHeight >= approximateKeyboardHeight
val hasChanged = isKeyboardOpen xor keyboardOpen
if (hasChanged) {
isKeyboardOpen = keyboardOpen
notifier.onNext(keyboardOpen)
}
}
val lifeCycleObserver = object : GenericLifecycleObserver {
override fun onStateChanged(source: LifecycleOwner, event: Lifecycle.Event?) {
if (source.lifecycle.currentState == Lifecycle.State.DESTROYED) {
viewTreeObserver.removeOnDrawListener(onDrawListener)
source.lifecycle.removeObserver(this)
notifier.onComplete()
}
}
}
viewTreeObserver.addOnDrawListener(onDrawListener)
lifecycle.addObserver(lifeCycleObserver)
return notifier
.doOnDispose {
viewTreeObserver.removeOnDrawListener(onDrawListener)
lifecycle.removeObserver(lifeCycleObserver)
}
.onTerminateDetach()
.hide()
}
例子:
(context as AppCompatActivity)
.keyboardVisibilityChanges()
.subscribeBy { isKeyboardOpen ->
// your logic
}
dip()
和 getScreenHeight()
方法。 - Marcin Kunert