在AndroidManifest.xml中的<activity..>set android:windowSoftInputMode=“stateAlwaysHidden”

我正在使用以下Kotlin Activity扩展：

/**
 * Hides soft keyboard if is open.
 */
fun Activity.hideKeyboard() {
    currentFocus?.windowToken?.let {
        (getSystemService(Context.INPUT_METHOD_SERVICE) as? InputMethodManager?)
                ?.hideSoftInputFromWindow(it, InputMethodManager.HIDE_NOT_ALWAYS)
    }
}

/**
 * Shows soft keyboard and request focus to given view.
 */
fun Activity.showKeyboard(view: View) {
    view.requestFocus()
    currentFocus?.windowToken?.let {
        (getSystemService(Context.INPUT_METHOD_SERVICE) as? InputMethodManager?)
                ?.showSoftInput(view, InputMethodManager.SHOW_IMPLICIT)
    }
}

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

此代码段可以帮助：

    final InputMethodManager inputMethodManager = (InputMethodManager) getSystemService(Activity.INPUT_METHOD_SERVICE);
    if (inputMethodManager != null && inputMethodManager.isActive()) {
        if (getCurrentFocus() != null) {
            inputMethodManager.hideSoftInputFromWindow(getCurrentFocus().getWindowToken(), 0);
        }
    }

它可以根据需要以不同的方法调用（例如onPause、onResume、onRestart…）

使用这个

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

对于Xamarin.Android：

public void HideKeyboard()
{
    var imm = activity.GetSystemService(Context.InputMethodService).JavaCast<InputMethodManager>();
    var view = activity.CurrentFocus ?? new View(activity);
    imm.HideSoftInputFromWindow(view.WindowToken, HideSoftInputFlags.None);
}