试试这个

简单，您可以在活动中调用

 public static void hideKeyboardwithoutPopulate(Activity activity) {
    InputMethodManager inputMethodManager =
            (InputMethodManager) activity.getSystemService(
                    Activity.INPUT_METHOD_SERVICE);
    inputMethodManager.hideSoftInputFromWindow(
            activity.getCurrentFocus().getWindowToken(), 0);
}

在您的主活动中调用

 hideKeyboardwithoutPopulate(MainActivity.this);

添加到Manifest文件中的活动android:windowSoftInputMode=“stateHidden”。例子：

<activity
            android:name=".ui.activity.MainActivity"
            android:label="@string/mainactivity"
            android:windowSoftInputMode="stateHidden"/>

/** 
 *
 *   Hide I Said!!!
 *
 */
public static boolean hideSoftKeyboard(@NonNull Activity activity) {
    View currentFocus = activity.getCurrentFocus();
    if (currentFocus == null) {
        currentFocus = activity.getWindow().getDecorView();
        if (currentFocus != null) {
            return getSoftInput(activity).hideSoftInputFromWindow(currentFocus.getWindowToken(), 0, null);
        }
    }
    return false;
}

public static boolean hideSoftKeyboard(@NonNull Context context) {
   if(Activity.class.isAssignableFrom(context.getClass())){
       return hideSoftKeyboard((Activity)context);
   }
   return false;
}

public static InputMethodManager getSoftInput(@NonNull Context context) {
    return (InputMethodManager) context.getSystemService(Activity.INPUT_METHOD_SERVICE);
}

只需在活动中使用此优化代码：

if (this.getCurrentFocus() != null) {
    InputMethodManager inputManager = (InputMethodManager) this.getSystemService(Context.INPUT_METHOD_SERVICE);
    inputManager.hideSoftInputFromWindow(this.getCurrentFocus().getWindowToken(), InputMethodManager.HIDE_NOT_ALWAYS);
}

如果有人感兴趣的话，我已经为Kotlin写了一个小扩展，但没有太多测试：

fun Fragment.hideKeyboard(context: Context = App.instance) {
    val windowToken = view?.rootView?.windowToken
    windowToken?.let {
        val imm = context.getSystemService(Activity.INPUT_METHOD_SERVICE) as InputMethodManager
        imm.hideSoftInputFromWindow(windowToken, 0)
    }
}

App.instance是存储在Application中的静态“this”Application对象

更新：在某些情况下，windowToken为空。我增加了使用反射来检测键盘是否关闭的额外关闭方式

/**
 * If no window token is found, keyboard is checked using reflection to know if keyboard visibility toggle is needed
 *
 * @param useReflection - whether to use reflection in case of no window token or not
 */
fun Fragment.hideKeyboard(context: Context = MainApp.instance, useReflection: Boolean = true) {
    val windowToken = view?.rootView?.windowToken
    val imm = context.getSystemService(Context.INPUT_METHOD_SERVICE) as InputMethodManager
    windowToken?.let {
        imm.hideSoftInputFromWindow(windowToken, 0)
    } ?: run {
        if (useReflection) {
            try {
                if (getKeyboardHeight(imm) > 0) {
                    imm.toggleSoftInput(0, InputMethodManager.HIDE_NOT_ALWAYS)
                }
            } catch (exception: Exception) {
                Timber.e(exception)
            }
        }
    }
}

fun getKeyboardHeight(imm: InputMethodManager): Int = InputMethodManager::class.java.getMethod("getInputMethodWindowVisibleHeight").invoke(imm) as Int

在Android中，要通过InputMethodManage隐藏Vkeyboard，您可以通过传递包含焦点视图的窗口的标记来隐藏SoftInputFromWindow。

View view = this.getCurrentFocus();
if (view != null) {  
InputMethodManager im = 
(InputMethodManager)getSystemService(Context.INPUT_METHOD_SERVICE);
im.hideSoftInputFromWindow(view.getWindowToken(), 0);
}

通过调用editText.clearFocus（），然后调用InputMethodManager.HIDE_IMPLICIT_ONLY甚至可以工作