通过创建一个扩展来隐藏Kotlin中的软键盘，您可以全局使用该扩展。为此，需要创建一个Singleton类。

object Extensions {
    
      fun View.hideKeyboard() {
            val inputMethodManager =                                                 
            context.getSystemService(AppCompatActivity.INPUT_METHOD_SERVICE)           
            as InputMethodManager
            inputMethodManager.hideSoftInputFromWindow(windowToken, 0)
        }
    }

在需要隐藏键盘的片段类的活动中，可以使用mainlayout id调用此函数，如下所示

//constraintEditLayout is my main view layout, if you are using other layout like relative or linear layouts you can call with that layout id
constraintEditLayout.hideKeyboard()

简单的方法家伙：试试这个。。。

private void closeKeyboard(boolean b) {

        View view = this.getCurrentFocus();

        if(b) {
            if (view != null) {
                InputMethodManager imm = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);
                imm.hideSoftInputFromWindow(view.getWindowToken(), 0);
            }
        }
        else {
            InputMethodManager imm = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);
            imm.showSoftInput(view, 0);
        }
    }

如果您的应用程序以API Level 21或更高为目标，则可以使用默认方法：

editTextObj.setShowSoftInputOnFocus(false);

确保在EditText XML标记中设置了以下代码。

<EditText  
    ....
    android:enabled="true"
    android:focusable="true" />

我创建了一个布局，部分来自xml，部分来自自定义布局引擎，所有这些都在代码中处理。对我来说，唯一有效的方法是跟踪键盘是否打开，并使用如下键盘切换方法：

public class MyActivity extends Activity
{
    /** This maintains true if the keyboard is open. Otherwise, it is false. */
    private boolean isKeyboardOpen = false;

    @Override
    public void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        LayoutInflater inflater;
        inflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        View contentView = inflater.inflate(context.getResources().getIdentifier("main", "layout", getPackageName()), null);

        setContentView(contentView);
        contentView.getViewTreeObserver().addOnGlobalLayoutListener(new OnGlobalLayoutListener() 
        {
            public void onGlobalLayout() 
            {
                Rect r = new Rect();
                contentView.getWindowVisibleDisplayFrame(r);
                int heightDiff = contentView.getRootView().getHeight() - (r.bottom - r.top);
                if (heightDiff > 100) 
                    isKeyboardVisible = true;
                else
                    isKeyboardVisible = false;
             });
         }
    }

    public void closeKeyboardIfOpen()
    {
        InputMethodManager imm;
        imm = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);
        if (isKeyboardVisible)
            imm.toggleSoftInput(InputMethodManager.HIDE_IMPLICIT_ONLY, 0);
    }   
}

通过将Generic方法添加到Utility或Helper类。通过调用自己，您可以隐藏和显示键盘

fun AppCompatActivity.hideKeyboard() {
            val view = this.currentFocus
            if (view != null) {
                val imm = getSystemService(Context.INPUT_METHOD_SERVICE) as InputMethodManager
                imm.hideSoftInputFromWindow(view.windowToken, 0)
            }
           window.setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_STATE_ALWAYS_HIDDEN)

        }


 fun AppCompatActivity.showKeyboard() {
            val view = this.currentFocus
            if (view != null) {
                val imm = getSystemService(Context.INPUT_METHOD_SERVICE) as InputMethodManager
                imm.hideSoftInputFromWindow(view.windowToken, 0)
            }                     window.setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_STATE_ALWAYS_HIDDEN)

        }

这对我有用。

public static void hideKeyboard(Activity act, EditText et){
    Context c = act.getBaseContext();
    View v = et.findFocus();
    if(v == null)
        return;
    InputMethodManager inputManager = (InputMethodManager) c.getSystemService(Context.INPUT_METHOD_SERVICE);
    inputManager.hideSoftInputFromWindow(v.getWindowToken(), InputMethodManager.HIDE_NOT_ALWAYS);
}