NestedScrollView

参考文章：

http://cache.baiducontent.com/c?m=9d78d513d9d431ad4f9d94697b13c0166d4381132ba7d4020cd3843893732b35506793ac51200770a2d20c6d16dc4a48adb0687d6d4566f58cc9fb57c0fed76d38885069324bda5612a544ed9c1a32c157c107b6b247bceaed76c8f997ce8216049650037f81fa8a5c0112c065f51626e3d1c30e4a01&p=9b72da15d9c040ac49f7c7710f5f83&newp=c9759a46d7c014fc57efdc3c4757a5231610db2151d7d4176b82c825d7331b001c3bbfb423241305d6c4786c07a54c5ae8fb3575370123a3dda5c91d9fb4c57479dd&user=baidu&fm=sc&query=%B0%B2%D7%BF%B6%A5%B2%BF%D0%FC%B8%A1&qid=dffe63250000292e&p1=5

http://blog.csdn.net/mchenys/article/details/51541306

效果图：

实现步骤：

1. 将需要悬浮的layout放到CollapsingToolbarLayout之外，AppBarLayout之内
2. 将CollapsingToolbarLayout的app:layout_scrollFlags设置为scroll
3. 给滚动的NestedScroolView设置
   app:layout_behavior="@String/appbar_scrolling_view_behavior"
   就大功告成了(记得根布局要是CoordinatorLayout)

<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:fitsSystemWindows="true"
    tools:context="com.example.administrator.scroll4.MainActivity">

    <android.support.design.widget.AppBarLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content">

        <android.support.design.widget.CollapsingToolbarLayout
            android:layout_width="match_parent"
            android:layout_height="220dp"
            app:contentScrim="#000000"
            app:layout_scrollFlags="scroll">

            <TextView
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:background="#987545"
                android:gravity="center"
                android:text="banner区域"
                android:textColor="#ffffff" />
        </android.support.design.widget.CollapsingToolbarLayout>

        <TextView
            android:layout_width="match_parent"
            android:layout_height="30dp"
            android:gravity="center"
            android:text="悬浮的部分" />
    </android.support.design.widget.AppBarLayout>

    <android.support.v4.widget.NestedScrollView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:layout_behavior="@string/appbar_scrolling_view_behavior">

        <com.example.administrator.scroll4.MyListView
            android:id="@+id/lv"
            android:layout_width="match_parent"
            android:layout_height="match_parent" />
    </android.support.v4.widget.NestedScrollView>
</android.support.design.widget.CoordinatorLayout>

import android.content.Context;
import android.util.AttributeSet;
import android.widget.ListView;

/**
 * Created by Administrator on 2017/5/5.
 */
public class MyListView extends ListView {
    public MyListView(Context context) {
        super(context);
    }

    public MyListView(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    public MyListView(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
    }

    @Override
    public void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {

        int expandSpec = MeasureSpec.makeMeasureSpec(Integer.MAX_VALUE >> 2,
                MeasureSpec.AT_MOST);
        super.onMeasure(widthMeasureSpec, expandSpec);
    }

}

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.widget.ArrayAdapter;

import java.util.ArrayList;
import java.util.List;

public class MainActivity extends AppCompatActivity {

    private MyListView lv;
    private List<String> list;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        lv = (MyListView) findViewById(R.id.lv);
        list = new ArrayList<>();
        for (int i = 0; i < 100; i++) {
            list.add(i + "");
        }
        ArrayAdapter adapter = new ArrayAdapter(this, android.R.layout.simple_list_item_1, list);
        lv.setAdapter(adapter);
    }
}