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
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
其他回答
有一个隐藏的方法可以帮助这个,inputmethodmanager。getinputmethodwindowvisibleheight。但我不知道为什么要藏起来。
import android.content.Context
import android.os.Handler
import android.view.inputmethod.InputMethodManager
class SoftKeyboardStateWatcher(private val ctx: Context) {
companion object {
private const val DELAY = 10L
}
private val handler = Handler()
private var isSoftKeyboardOpened: Boolean = false
private val height: Int
get() {
val imm = ctx.getSystemService(Context.INPUT_METHOD_SERVICE) as InputMethodManager
val method = imm.javaClass.getMethod("getInputMethodWindowVisibleHeight")
method.isAccessible = true
return method.invoke(imm) as Int
}
private val task: Runnable by lazy {
Runnable {
start()
if (!isSoftKeyboardOpened && height > 0) {
isSoftKeyboardOpened = true
notifyOnSoftKeyboardOpened(height)
} else if (isSoftKeyboardOpened && height == 0) {
isSoftKeyboardOpened = false
notifyOnSoftKeyboardClosed()
}
}
}
var listener: SoftKeyboardStateListener? = null
interface SoftKeyboardStateListener {
fun onSoftKeyboardOpened(keyboardHeightInPx: Int)
fun onSoftKeyboardClosed()
}
fun start() {
handler.postDelayed(task, DELAY)
}
fun stop() {
handler.postDelayed({
if (!isSoftKeyboardOpened) handler.removeCallbacks(task)
}, DELAY * 10)
}
private fun notifyOnSoftKeyboardOpened(keyboardHeightInPx: Int) {
listener?.onSoftKeyboardOpened(keyboardHeightInPx)
}
private fun notifyOnSoftKeyboardClosed() {
listener?.onSoftKeyboardClosed()
}
}
我花了一点时间才想明白……我运行它一些castexception,但发现你可以用类的名称替换layout.xml中的LinearLayout。
是这样的:
<?xml version="1.0" encoding="UTF-8"?>
<LinearLayout android:layout_width="fill_parent" android:layout_height="fill_parent"
xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/llMaster">
<com.ourshoppingnote.RelativeLayoutThatDetectsSoftKeyboard android:background="@drawable/metal_background"
android:layout_width="fill_parent" android:layout_height="fill_parent"
android:id="@+id/rlMaster" >
<LinearLayout android:layout_width="fill_parent"
android:layout_height="1dip" android:background="@drawable/line"></LinearLayout>
....
</com.ourshoppingnote.RelativeLayoutThatDetectsSoftKeyboard>
</LinearLayout>
这样你就不会遇到任何演员问题。
... 如果你不想在每个页面上都这样做,我建议你使用“安卓版MasterPage”。点击这里查看链接: http://jnastase.alner.net/archive/2011/01/08/ldquomaster-pagesrdquo-in-android.aspx
有一种直接的方法可以找出答案。而且,它不需要任何布局更改。 所以,它也可以在沉浸式全屏模式下工作。 诀窍在于,您尝试隐藏或显示软键盘,并捕获尝试的结果。 没有恐慌,这并不真正显示或隐藏键盘。我们只要求状态。 为了保持最新,您可以简单地重复操作,例如,每200毫秒,使用处理器。 您可以在这里找到一个实现:https://stackoverflow.com/a/27567074/2525452
你可以通过使用活动的decorView来观察软键盘的隐藏。
public final class SoftKeyboardUtil {
public static final String TAG = "SoftKeyboardUtil";
public static void observeSoftKeyBoard(Activity activity , final OnSoftKeyBoardHideListener listener){
final View decorView = activity.getWindow().getDecorView();
decorView.getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
@Override
public void onGlobalLayout() {
Rect rect = new Rect();
decorView.getWindowVisibleDisplayFrame(rect);
int displayHight = rect.bottom - rect.top;
int hight = decorView.getHeight();
boolean hide = (double)displayHight / hight > 0.8 ;
if(Log.isLoggable(TAG, Log.DEBUG)){
Log.d(TAG ,"DecorView display hight = "+displayHight);
Log.d(TAG ,"DecorView hight = "+ hight);
Log.d(TAG, "softkeyboard visible = " + !hide);
}
listener.onSoftKeyBoardVisible(!hide);
}
});
}
public interface OnSoftKeyBoardHideListener{
void onSoftKeyBoardVisible(boolean visible);
}
}
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
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