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
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;
}
其他回答
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
}
}
});
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
if (keyopen())
{
InputMethodManager imm = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);
imm.toggleSoftInput(InputMethodManager.HIDE_IMPLICIT_ONLY,0);
}
上面的函数是我用来检查键盘是否可见的。如果是,那我就关上。
下面显示了所需的两种方法。
首先,在onCreate中定义可工作的窗口高度。
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// add to onCreate method
Rect rectgle= new Rect();
Window window= getWindow();
window.getDecorView().getWindowVisibleDisplayFrame(rectgle);
sheight= rectgle.bottom;
//
}
然后,添加一个布尔方法来获取该实例的窗口高度。如果它与原来的不匹配(假设您没有在此过程中更改它……),那么键盘是打开的。
public boolean keyopen()
{
Rect rectgle= new Rect();
Window window= getWindow();
window.getDecorView().getWindowVisibleDisplayFrame(rectgle);
int curheight= rectgle.bottom;
if (curheight!=sheight)
{
return true;
}
else
{
return false;
}
}
Frotz !
除了正确的答案,我必须在onCreateView的末尾添加这个,当使用一个片段内的webview。
getActivity().getWindow().setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_ADJUST_PAN);
可能是因为我在一个片段中运行Webview,或者可能是API 30上的一个新行为,我的问题是,即使显示键盘,片段的高度也从未改变。
所以对于Fragment,整个代码应该是
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = super.onCreateView(inflater, container, savedInstanceState);
//mWebView.postUrl("https://www.google.com/");
final View activityRootView = view;
layoutListener = 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.
activityRootView.getWindowVisibleDisplayFrame(r);
// This variable was created only for Debug purposes and
// to see the height change when clicking on a field inside mWebView
int screenHeight = activityRootView.getRootView().getHeight();
Log.d("onGlobalLayout", "rect: " + r.toString());
Log.d("onGlobalLayout", "screenHeight: " + screenHeight);
//The difference on the heights from bottom to top and on the root height
int heightDiff = screenHeight - (r.bottom - r.top);
Log.d("onGlobalLayout", "heightDiff: " + heightDiff);
//I suggest to put 250 on resources to have better order
float dpx = dpToPx(getActivity(), 250);
if (previousHeightDiff != heightDiff) {
if (heightDiff > dpx) {
isSoftKeyboardPresent = true;
} else {
isSoftKeyboardPresent = false;
}
previousHeightDiff = heightDiff;
}
}
};
activityRootView.getViewTreeObserver().addOnGlobalLayoutListener(layoutListener);
getActivity().getWindow().setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_ADJUST_PAN);
return view;
}
private static float dpToPx(Context context, float valueInDp) {
DisplayMetrics metrics = context.getResources().getDisplayMetrics();
return TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, valueInDp, metrics);
}
也有解决方案与系统嵌入,但它只适用于API >= 21 (Android L)。说你有BottomNavigationView,这是线性布局的孩子,你需要隐藏它时,键盘显示:
> LinearLayout
> ContentView
> BottomNavigationView
你所需要做的就是以这样的方式扩展LinearLayout:
public class KeyboardAwareLinearLayout extends LinearLayout {
public KeyboardAwareLinearLayout(Context context) {
super(context);
}
public KeyboardAwareLinearLayout(Context context, @Nullable AttributeSet attrs) {
super(context, attrs);
}
public KeyboardAwareLinearLayout(Context context,
@Nullable AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
}
public KeyboardAwareLinearLayout(Context context, AttributeSet attrs,
int defStyleAttr, int defStyleRes) {
super(context, attrs, defStyleAttr, defStyleRes);
}
@Override
public WindowInsets onApplyWindowInsets(WindowInsets insets) {
int childCount = getChildCount();
for (int index = 0; index < childCount; index++) {
View view = getChildAt(index);
if (view instanceof BottomNavigationView) {
int bottom = insets.getSystemWindowInsetBottom();
if (bottom >= ViewUtils.dpToPx(200)) {
// keyboard is shown
view.setVisibility(GONE);
} else {
// keyboard is hidden
view.setVisibility(VISIBLE);
}
}
}
return insets;
}
}
这个想法是,当键盘显示时,系统insets被改变为相当大的.bottom值。
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