KeyboardHider (Android)

KeyboardHider.java

/**
 * Provides a simple way to hide a keyboard, because google didn't
 */
@Singleton
public final class KeyboardHider {

    private final InputMethodManager inputMethodManager;

    @Inject KeyboardHider(InputMethodManager inputMethodManager) {
        this.inputMethodManager = checkNotNull(inputMethodManager, "inputMethodManager == null");
    }

    /**
     * Hides a keyboard if one is being displayed.
     *
     * @param activity The current activity.
     * @throws NullPointerException if activity is null
     */
    public void hideKeyboard(Activity activity) {
        // Find the currently focused view, so we can grab the correct window token from it.
        View view = checkNotNull(activity, "activity == null").getCurrentFocus();
        // If no view currently has focus, create a new one, just so we can grab a window token from it
        if (view == null) {
            view = new View(activity);
        }

        inputMethodManager.hideSoftInputFromWindow(view.getWindowToken(), 0);
    }
}