Android如何在点击时只显示一行隐藏项目

<android.support.design.widget.CoordinatorLayout
    ...
    >

    <android.support.design.widget.AppBarLayout
        ...
        >

        <android.support.design.widget.CollapsingToolbarLayout
            ...
            >

            <!-- 添加需要显示的内容 -->
            <TextView
                android:id="@+id/textView"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:text="隐藏的内容"
                android:visibility="gone" />

        </android.support.design.widget.CollapsingToolbarLayout>

    </android.support.design.widget.AppBarLayout>

    <!-- 添加其他内容 -->

</android.support.design.widget.CoordinatorLayout>

CollapsingToolbarLayout collapsingToolbarLayout = findViewById(R.id.collapsingToolbarLayout);
TextView textView = findViewById(R.id.textView);

collapsingToolbarLayout.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        if (textView.getVisibility() == View.GONE) {
            textView.setVisibility(View.VISIBLE);
        } else {
            textView.setVisibility(View.GONE);
        }
    }
});