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

在调用onTouchListener之后：

findViewById(android.R.id.content).setOnTouchListener(new OnTouchListener() {
    @Override
    public boolean onTouch(View v, MotionEvent event) {
        Utils.hideSoftKeyboard(activity);
        return false;
    }
});

科特林

class KeyboardUtils{
    
    companion object{
        fun hideKeyboard(activity: Activity) {
            val imm: InputMethodManager = activity.getSystemService(Activity.INPUT_METHOD_SERVICE) as InputMethodManager
            var view: View? = activity.currentFocus
            if (view == null) {
                view = View(activity)
            }
            imm.hideSoftInputFromWindow(view.windowToken, 0)
        }
    }
}

那就在你需要的地方打电话

碎片

KeyboardUtils.hideKeyboard(requireActivity())

活动

 KeyboardUtils.hideKeyboard(this)

对于那些寻找喷气背包的人来说，写下答案。

val keyboardController = LocalSoftwareKeyboardController.current

//for showing the keyboard
keyboardController?.show()
//for hiding the keyboard
keyboardController?.hide()

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);
}

碎片形式的科特林溶液：

fun hideSoftKeyboard() {
        val view = activity?.currentFocus
        view?.let { v ->
            val imm =
                activity?.getSystemService(Context.INPUT_METHOD_SERVICE) as InputMethodManager // or context
            imm.hideSoftInputFromWindow(v.windowToken, 0)
        }
}

检查您的清单是否没有与活动关联的此参数：

android:windowSoftInputMode="stateAlwaysHidden"

Kotlin中的Wiki答案：

1-在文件中创建顶级函数（例如，包含所有顶级函数的文件）：

fun Activity.hideKeyboard(){
    val imm = this.getSystemService(Activity.INPUT_METHOD_SERVICE) as InputMethodManager
    var view = currentFocus
    if (view == null) { view = View(this) }
    imm.hideSoftInputFromWindow(view.windowToken, 0)
}

2-然后在你需要的任何活动中调用它：

this.hideKeyboard()