点击 空白处 键盘进行隐藏

/**
 * 点击空白区域隐藏键盘.
 */
@Override
public boolean onTouchEvent(MotionEvent event) {
    InputMethodManager imm = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);
    if (event.getAction() == MotionEvent.ACTION_DOWN) {
        if (LoginActivity.this.getCurrentFocus() != null) {
            if (LoginActivity.this.getCurrentFocus().getWindowToken() != null) {
                imm.hideSoftInputFromWindow(LoginActivity.this.getCurrentFocus().getWindowToken(), InputMethodManager.HIDE_NOT_ALWAYS);
            }
        }
    }
    return super.onTouchEvent(event);
}