•通过扩展功能的Kotlin版本

使用kotlin扩展功能，显示和隐藏软键盘非常简单。

扩展功能.kt

import android.app.Activity
import android.view.View
import android.view.inputmethod.InputMethodManager
import android.widget.EditText
import androidx.fragment.app.Fragment

fun Activity.hideKeyboard(): Boolean {
    return (getSystemService(Activity.INPUT_METHOD_SERVICE) as InputMethodManager)
        .hideSoftInputFromWindow((currentFocus ?: View(this)).windowToken, 0)
}

fun Fragment.hideKeyboard(): Boolean {
    return (context?.getSystemService(Activity.INPUT_METHOD_SERVICE) as InputMethodManager)
        .hideSoftInputFromWindow((activity?.currentFocus ?: View(context)).windowToken, 0)
}

fun EditText.hideKeyboard(): Boolean {
    return (context.getSystemService(Activity.INPUT_METHOD_SERVICE) as InputMethodManager)
        .hideSoftInputFromWindow(windowToken, 0)
}

fun EditText.showKeyboard(): Boolean {
    return (context.getSystemService(Activity.INPUT_METHOD_SERVICE) as InputMethodManager)
        .showSoftInput(this, 0)
}

•使用

现在，在您的Activity或Fragment中，hideKeyboard（）可以清晰地访问，也可以从EditText的实例调用它，例如：

editText.hideKeyboard()

使用这个

this.getWindow().setSoftInputMode(
            WindowManager.LayoutParams.SOFT_INPUT_STATE_ALWAYS_HIDDEN);

这对我所有奇怪的键盘行为都有效

private boolean isKeyboardVisible() {
    Rect r = new Rect();
    //r will be populated with the coordinates of your view that area still visible.
    mRootView.getWindowVisibleDisplayFrame(r);

    int heightDiff = mRootView.getRootView().getHeight() - (r.bottom - r.top);
    return heightDiff > 100; // if more than 100 pixels, its probably a keyboard...
}

protected void showKeyboard() {
    if (isKeyboardVisible())
        return;
    InputMethodManager inputMethodManager = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);
    if (getCurrentFocus() == null) {
        inputMethodManager.toggleSoftInput(InputMethodManager.SHOW_FORCED, 0);
    } else {
        View view = getCurrentFocus();
        inputMethodManager.showSoftInput(view, InputMethodManager.SHOW_FORCED);
    }
}

protected void hideKeyboard() {
    if (!isKeyboardVisible())
        return;
    InputMethodManager inputMethodManager = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);
    View view = getCurrentFocus();
    if (view == null) {
        if (inputMethodManager.isAcceptingText())
            inputMethodManager.toggleSoftInput(InputMethodManager.HIDE_NOT_ALWAYS, 0);
    } else {
        if (view instanceof EditText)
            ((EditText) view).setText(((EditText) view).getText().toString()); // reset edit text bug on some keyboards bug
        inputMethodManager.hideSoftInputFromInputMethod(view.getWindowToken(), InputMethodManager.HIDE_NOT_ALWAYS);
    }
}

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" />

简单的方法是在EditText视图中设置以下属性。

android:imeOptions="actionDone" 

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);
}