在布局根节点加上下面三行

android:id="@+id/view_parent"
android:clickable="true"
android:focusableInTouchMode="true"

在代码中监听view_parent的FocusChangeListener事件

view_parent.setOnFocusChangeListener(new View.OnFocusChangeListener() {
    @Override
    public void onFocusChange(View view, boolean b) {
        if(b){
            InputMethodManager manager = ((InputMethodManager)mActivity.getSystemService(mActivity.INPUT_METHOD_SERVICE));
            if (manager != null)
                manager.hideSoftInputFromWindow(view.getWindowToken(),InputMethodManager.HIDE_NOT_ALWAYS);
        }
    }
});