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
我使用了与鲁班的答案略有不同的答案,事实证明在某些情况下更有帮助,特别是在使用高分辨率设备时。
final View activityRootView = findViewById(android.R.id.content);
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
}
}
});
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
}
这是我的解决方案,它很有效。而不是寻找像素大小,只是检查内容视图的高度是否改变:
// Scroll to the latest comment whenever the keyboard is shown
commentsContent.getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
private int oldHeight;
@Override
public void onGlobalLayout() {
int newHeight = commentsContent.getMeasuredHeight();
if (newHeight < oldHeight) {
// Check for the keyboard showing in case the height difference
// is a result of orientation change
if (isSoftKeyboardShowing(CommentsActivity.this)) {
// Keyboard is showing so scroll to the latest comment
scrollToLatestComment();
}
}
oldHeight = newHeight;
}
});
public static boolean isSoftKeyboardShowing(Activity activity) {
InputMethodManager inputMethodManager = (InputMethodManager) activity.getSystemService(Activity.INPUT_METHOD_SERVICE);
return inputMethodManager.isActive();
}
抱歉回答晚了,但我已经创建了一个小的帮助类来处理打开/关闭事件,通知侦听器和其他有用的东西,可能有人会发现它有帮助:
import android.graphics.Rect;
import android.view.View;
import android.view.ViewTreeObserver;
import java.util.LinkedList;
import java.util.List;
public class SoftKeyboardStateWatcher implements ViewTreeObserver.OnGlobalLayoutListener {
public interface SoftKeyboardStateListener {
void onSoftKeyboardOpened(int keyboardHeightInPx);
void onSoftKeyboardClosed();
}
private final List<SoftKeyboardStateListener> listeners = new LinkedList<SoftKeyboardStateListener>();
private final View activityRootView;
private int lastSoftKeyboardHeightInPx;
private boolean isSoftKeyboardOpened;
public SoftKeyboardStateWatcher(View activityRootView) {
this(activityRootView, false);
}
public SoftKeyboardStateWatcher(View activityRootView, boolean isSoftKeyboardOpened) {
this.activityRootView = activityRootView;
this.isSoftKeyboardOpened = isSoftKeyboardOpened;
activityRootView.getViewTreeObserver().addOnGlobalLayoutListener(this);
}
@Override
public void onGlobalLayout() {
final Rect r = new Rect();
//r will be populated with the coordinates of your view that area still visible.
activityRootView.getWindowVisibleDisplayFrame(r);
final int heightDiff = activityRootView.getRootView().getHeight() - (r.bottom - r.top);
if (!isSoftKeyboardOpened && heightDiff > 100) { // if more than 100 pixels, its probably a keyboard...
isSoftKeyboardOpened = true;
notifyOnSoftKeyboardOpened(heightDiff);
} else if (isSoftKeyboardOpened && heightDiff < 100) {
isSoftKeyboardOpened = false;
notifyOnSoftKeyboardClosed();
}
}
public void setIsSoftKeyboardOpened(boolean isSoftKeyboardOpened) {
this.isSoftKeyboardOpened = isSoftKeyboardOpened;
}
public boolean isSoftKeyboardOpened() {
return isSoftKeyboardOpened;
}
/**
* Default value is zero {@code 0}.
*
* @return last saved keyboard height in px
*/
public int getLastSoftKeyboardHeightInPx() {
return lastSoftKeyboardHeightInPx;
}
public void addSoftKeyboardStateListener(SoftKeyboardStateListener listener) {
listeners.add(listener);
}
public void removeSoftKeyboardStateListener(SoftKeyboardStateListener listener) {
listeners.remove(listener);
}
private void notifyOnSoftKeyboardOpened(int keyboardHeightInPx) {
this.lastSoftKeyboardHeightInPx = keyboardHeightInPx;
for (SoftKeyboardStateListener listener : listeners) {
if (listener != null) {
listener.onSoftKeyboardOpened(keyboardHeightInPx);
}
}
}
private void notifyOnSoftKeyboardClosed() {
for (SoftKeyboardStateListener listener : listeners) {
if (listener != null) {
listener.onSoftKeyboardClosed();
}
}
}
}
使用的例子:
final SoftKeyboardStateWatcher softKeyboardStateWatcher
= new SoftKeyboardStateWatcher(findViewById(R.id.activity_main_layout);
// Add listener
softKeyboardStateWatcher.addSoftKeyboardStateListener(...);
// then just handle callbacks
Reuben Scratton和Kachi提供的解决方案似乎依赖于设备的像素密度,如果你有一个高密度的设备,即使按下键盘,高度差也可能超过100。围绕这一点的工作将是看到初始高度差(键盘向下),然后与当前的差异进行比较。
boolean isOpened = false;
int firstHeightDiff = -1;
public void setListenerToRootView(){
final View activityRootView = getActivity().getWindow().getDecorView().findViewById(android.R.id.content);
Rect r = new Rect();
activityRootView.getWindowVisibleDisplayFrame(r);
firstHeightDiff = activityRootView.getRootView().getHeight() - (r.bottom - r.top);
activityRootView.getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
@Override
public void onGlobalLayout() {
if (isAdded()) {
Rect r = new Rect();
activityRootView.getWindowVisibleDisplayFrame(r);
int heightDiff = activityRootView.getRootView().getHeight() - (r.bottom - r.top);
isOpened = heightDiff>firstHeightDiff+100;
if (isAdded())
if(isOpened) {
//TODO stuff for when it is up
} else {
//TODO stuf for when it is down
}
}
}
});
}
我的答案基本上与Kachi的答案相同,但我将它包装到一个很好的helper类中,以清理它在整个应用程序中的使用方式。
import android.app.Activity;
import android.app.Fragment;
import android.graphics.Rect;
import android.view.View;
import android.view.ViewTreeObserver.OnGlobalLayoutListener;
/**
* Detects Keyboard Status changes and fires events only once for each change
*/
public class KeyboardStatusDetector {
KeyboardVisibilityListener visibilityListener;
boolean keyboardVisible = false;
public void registerFragment(Fragment f) {
registerView(f.getView());
}
public void registerActivity(Activity a) {
registerView(a.getWindow().getDecorView().findViewById(android.R.id.content));
}
public KeyboardStatusDetector registerView(final View v) {
v.getViewTreeObserver().addOnGlobalLayoutListener(new OnGlobalLayoutListener() {
@Override
public void onGlobalLayout() {
Rect r = new Rect();
v.getWindowVisibleDisplayFrame(r);
int heightDiff = v.getRootView().getHeight() - (r.bottom - r.top);
if (heightDiff > 100) { // if more than 100 pixels, its probably a keyboard...
/** Check this variable to debounce layout events */
if(!keyboardVisible) {
keyboardVisible = true;
if(visibilityListener != null) visibilityListener.onVisibilityChanged(true);
}
} else {
if(keyboardVisible) {
keyboardVisible = false;
if(visibilityListener != null) visibilityListener.onVisibilityChanged(false);
}
}
}
});
return this;
}
public KeyboardStatusDetector setVisibilityListener(KeyboardVisibilityListener listener) {
visibilityListener = listener;
return this;
}
public static interface KeyboardVisibilityListener {
public void onVisibilityChanged(boolean keyboardVisible);
}
}
你可以使用它来检测整个应用程序中的键盘变化,如下所示:
new KeyboardStatusDetector()
.registerFragment(fragment) //register to a fragment
.registerActivity(activity) //or register to an activity
.registerView(view) //or register to a view
.setVisibilityListener(new KeyboardVisibilityListener() {
@Override
public void onVisibilityChanged(boolean keyboardVisible) {
if(keyboardVisible) {
//Do stuff for keyboard visible
}else {
//Do stuff for keyboard hidden
}
}
});
注意:只使用一个“寄存器”调用。它们都是一样的,只是为了方便
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