listView悬浮头部的简单实现

  简而言之   为listView设置onScrollListener  当滑动时 firstVisibleItem>=要悬浮的 item的position时 让悬浮部分显示  否则隐藏

 其实就是在listView之上用帧布局覆盖了一个 悬浮部分 

@Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_sticky);
        invis = (LinearLayout) findViewById(R.id.invis);

        strs = new String[100];

        for (int i = 0; i < 20; i++) {
            strs[i] = "data-----" + i;
        }

        lv = (ListView) findViewById(R.id.lv);
        View header = View.inflate(this, R.layout.stick_header, null);//头部内容
        lv.addHeaderView(header);//添加头部
        lv.addHeaderView(View.inflate(this, R.layout.stick_action, null));//ListView条目中的悬浮部分 添加到头部

        lv.setAdapter(new ArrayAdapter<String>(this,
                android.R.layout.simple_list_item_1, strs));
        lv.setOnScrollListener(new OnScrollListener() {

            @Override
            public void onScrollStateChanged(AbsListView view, int scrollState) {

            }

            @Override
            public void onScroll(AbsListView view, int firstVisibleItem,int visibleItemCount, int totalItemCount) {
                if (firstVisibleItem >= 1) {
                    invis.setVisibility(View.VISIBLE);
                } else {

                    invis.setVisibility(View.GONE);
                }
            }
        });
    }

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent" >

    <TextView
        android:id="@+id/title"
        android:layout_width="match_parent"
        android:layout_height="30dp"
        android:background="#332b3b"
        android:gravity="center"
        android:text="标题"
        android:textColor="#ffffff" />

    <FrameLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_below="@id/title" >

        <ListView
            android:id="@+id/lv"
            android:layout_width="match_parent"
            android:layout_height="match_parent" />

        <LinearLayout
            android:id="@+id/invis"
            android:layout_width="fill_parent"
            android:layout_height="50dp"
            android:background="#ccedc7"
            android:orientation="horizontal"
            android:visibility="gone" >

            <TextView
                android:id="@+id/tv"
                android:layout_width="match_parent"
                android:layout_height="50dp"
                android:gravity="center"
                android:text="悬浮部分" />
        </LinearLayout>
    </FrameLayout>

</RelativeLayout>