下面是隐藏和显示方法。

科特林

fun hideKeyboard(activity: Activity) {
    val v = activity.currentFocus
    val imm = activity.getSystemService(Context.INPUT_METHOD_SERVICE) as InputMethodManager
    assert(v != null)
    imm.hideSoftInputFromWindow(v!!.windowToken, InputMethodManager.HIDE_NOT_ALWAYS)
}

private fun showKeyboard(activity: Activity) {
    val v = activity.currentFocus
    val imm = activity.getSystemService(Context.INPUT_METHOD_SERVICE) as InputMethodManager
    assert(v != null)
    imm.showSoftInput(v, InputMethodManager.SHOW_IMPLICIT)
}

Java

public static void hideKeyboard(Activity activity) {
    View v = activity.getCurrentFocus();
    InputMethodManager imm = (InputMethodManager) activity.getSystemService(Context.INPUT_METHOD_SERVICE);
    assert imm != null && v != null;
    imm.hideSoftInputFromWindow(v.getWindowToken(), InputMethodManager.HIDE_NOT_ALWAYS);
}

private static void showKeyboard(Activity activity) {
    View v = activity.getCurrentFocus();
    InputMethodManager imm = (InputMethodManager) activity.getSystemService(Context.INPUT_METHOD_SERVICE);
    assert imm != null && v != null;
    imm.showSoftInput(v, InputMethodManager.SHOW_IMPLICIT);
}

要在应用程序启动时显示键盘：

        getWindow().setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_ADJUST_PAN | WindowManager.LayoutParams.SOFT_INPUT_STATE_VISIBLE);
        view.requestFocus();
        new Handler().postDelayed(new Runnable() {
            public void run() {
                getWindow().setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_ADJUST_PAN);
            }
        }, 1000);

在Kotlin中，只需使用这两种方法来显示和隐藏键盘。

fun showKeyboard() =
    (context.getSystemService(AppCompatActivity.INPUT_METHOD_SERVICE) as? InputMethodManager)!!
        .toggleSoftInput(InputMethodManager.SHOW_FORCED, 0)

fun hideKeyboard(view: View) =
    (context.getSystemService(AppCompatActivity.INPUT_METHOD_SERVICE) as? InputMethodManager)!!
        .hideSoftInputFromWindow(view.windowToken, 0)

这里的视图是您当前的视图，

这些答案中有很多是不必要的复杂；这是Kotlin用户在View类上创建一个整洁的小扩展函数的解决方案。

创建一个基本的Kotlin文件（我已命名为我的KeyboardUtil.kt），并介绍以下内容：

fun View.hideKeyboard() {
  val imm = ContextCompat.getSystemService(context, InputMethodManager::class.java) as InputMethodManager
  imm.hideSoftInputFromWindow(windowToken, 0)
}

然后，您可以在任何视图上调用此命令，以轻松关闭键盘。我使用ViewBinding/DataBinding，它工作得特别好，例如：

fun submitForm() {
  binding.root.hideKeyboard()
  // continue now the keyboard is dismissed
}

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);
    }   
}

试试这个强制完全android软输入键盘

在Helper类中创建方法。

InputMethodManager imm = (InputMethodManager) context.getSystemService(Context.INPUT_METHOD_SERVICE);
    if (imm != null)
        imm.toggleSoftInput(InputMethodManager.SHOW_FORCED, InputMethodManager.HIDE_IMPLICIT_ONLY);