點擊空白處，軟鍵盤消失

/**
 * 點擊空白處，軟鍵盤消失
 */
@Override
public boolean dispatchTouchEvent(MotionEvent ev) {
    if (needCloseInputWhenTouchSpace() && ev.getAction() == MotionEvent.ACTION_DOWN) {
        View v = getCurrentFocus();
        if (InputMethodUtils.isShouldHideInput(v, ev)) {
            InputMethodUtils.forceHideInputMethod(v, this);
        }
    }
    return super.dispatchTouchEvent(ev);
}