当您想手动隐藏键盘时，单击按钮：

/**
 * Hides the already popped up keyboard from the screen.
 *
 */
public void hideKeyboard() {
    try {
        // use application level context to avoid unnecessary leaks.
        InputMethodManager inputManager = (InputMethodManager) getApplicationContext().getSystemService(Context.INPUT_METHOD_SERVICE);
        assert inputManager != null;
        inputManager.hideSoftInputFromWindow(getCurrentFocus().getWindowToken(), InputMethodManager.HIDE_NOT_ALWAYS);
    } catch (Exception e) {
        e.printStackTrace();
    }
}

当您想在屏幕上除编辑文本以外的任何地方隐藏键盘时在活动中重写此方法：

@Override
public boolean dispatchTouchEvent(MotionEvent ev) {
    View view = getCurrentFocus();
    if (view != null && (ev.getAction() == MotionEvent.ACTION_UP || ev.getAction() == MotionEvent.ACTION_MOVE) && view instanceof EditText && !view.getClass().getName().startsWith("android.webkit.")) {
        int scrcoords[] = new int[2];
        view.getLocationOnScreen(scrcoords);
        float x = ev.getRawX() + view.getLeft() - scrcoords[0];
        float y = ev.getRawY() + view.getTop() - scrcoords[1];
        if (x < view.getLeft() || x > view.getRight() || y < view.getTop() || y > view.getBottom())
            ((InputMethodManager)this.getSystemService(Context.INPUT_METHOD_SERVICE)).hideSoftInputFromWindow((this.getWindow().getDecorView().getApplicationWindowToken()), 0);
    }
    return super.dispatchTouchEvent(ev);
}

如果你在.xml android中设置：focused=“true”，那么他就不会工作，因为这是一个不可更改的设置。

因此解决方案：android：focusedByDefault=“true”

比他设置一次，可以隐藏/显示键盘

以上答案适用于不同的场景，但如果您想将键盘隐藏在视图中，并努力获得正确的上下文，请尝试以下操作：

setOnClickListener(new OnClickListener() {
    @Override
    public void onClick(View v) {
        hideSoftKeyBoardOnTabClicked(v);
    }
}

private void hideSoftKeyBoardOnTabClicked(View v) {
    if (v != null && context != null) {
        InputMethodManager imm = (InputMethodManager) context.getSystemService(Context.INPUT_METHOD_SERVICE);
        imm.hideSoftInputFromWindow(v.getApplicationWindowToken(), InputMethodManager.HIDE_NOT_ALWAYS);
    }
}

并从构造函数获取上下文：）

public View/RelativeLayout/so and so (Context context, AttributeSet attrs, int defStyle) {
    super(context, attrs, defStyle);
    this.context = context;
    init();
}

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

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)

        }

到目前为止，Saurabh Pareek给出了最好的答案。

不过，不妨使用正确的标志。

/* hide keyboard */
((InputMethodManager) getSystemService(Activity.INPUT_METHOD_SERVICE))
    .toggleSoftInput(InputMethodManager.SHOW_IMPLICIT, 0);

/* show keyboard */
((InputMethodManager) getSystemService(Activity.INPUT_METHOD_SERVICE))
    .toggleSoftInput(0, InputMethodManager.HIDE_IMPLICIT_ONLY);

实际使用示例

/* click button */
public void onClick(View view) {      
  /* hide keyboard */
  ((InputMethodManager) getSystemService(Activity.INPUT_METHOD_SERVICE))
      .toggleSoftInput(InputMethodManager.SHOW_IMPLICIT, 0);

  /* start loader to check parameters ... */
}

/* loader finished */
public void onLoadFinished(Loader<Object> loader, Object data) {
    /* parameters not valid ... */

    /* show keyboard */
    ((InputMethodManager) getSystemService(Activity.INPUT_METHOD_SERVICE))
        .toggleSoftInput(0, InputMethodManager.HIDE_IMPLICIT_ONLY);

    /* parameters valid ... */
}