Android实现顶部悬浮效果

<?xml version="1.0" encoding="utf-8"?>
<android.support.v4.widget.swiperefreshlayout 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:id="@+id/swiperefreshlayout"
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 tools:context=".ui.activity.newpersonalcardactivity">

 <android.support.design.widget.coordinatorlayout
  android:id="@+id/rootlayout"
  android:layout_width="match_parent"
  android:layout_height="match_parent">

  <android.support.design.widget.appbarlayout
   android:id="@+id/appbarlayout"
   android:layout_width="match_parent"
   android:layout_height="wrap_content">

   <android.support.design.widget.collapsingtoolbarlayout
    android:id="@+id/collapsingtoolbarlayout"
    android:layout_width="match_parent"
    android:layout_height="192dp"
    app:layout_scrollflags="scroll|exituntilcollapsed"
    app:titleenabled="false">

    <linearlayout
     android:id="@+id/headlayout"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
     android:orientation="vertical"
     app:layout_collapsemode="pin"
     app:layout_collapseparallaxmultiplier="0.7">

     <include layout="@layout/personal_new_top" />
    </linearlayout>

    <android.support.v7.widget.toolbar
     android:id="@+id/toolbar"
     android:layout_width="match_parent"
     android:layout_height="44dp"
     android:background="@color/white"
     android:navigationicon="@drawable/icon_back"
     app:contentinsetleft="0dp"
     app:contentinsetstart="0dp"
     app:layout_collapsemode="pin"
     app:navigationicon="@drawable/icon_back">

     <textview
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:layout_gravity="center"
      android:singleline="true"
      android:textcolor="@color/c333333"
      android:textsize="16sp"
      tools:text="讲师" />
    </android.support.v7.widget.toolbar>
   </android.support.design.widget.collapsingtoolbarlayout>

   <include layout="@layout/new_personal_tabs" />
  </android.support.design.widget.appbarlayout>

  <android.support.v4.widget.nestedscrollview
   android:id="@+id/nestedscrollview"
   android:layout_width="match_parent"
   android:layout_height="match_parent"
   android:fillviewport="true"
   android:scrollbars="none"
   app:layout_behavior="@string/appbar_scrolling_view_behavior">

   <android.support.v4.view.viewpager
    android:id="@+id/viewpager"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    app:layout_behavior="@string/appbar_scrolling_view_behavior" />
  </android.support.v4.widget.nestedscrollview>
 </android.support.design.widget.coordinatorlayout>
</android.support.v4.widget.swiperefreshlayout>

 @override
 protected void oncreate(bundle savedinstancestate) {
 super.oncreate(savedinstancestate);
 arouter.getinstance().inject(this);
 setcontentview(r.layout.activity_new_personal_card);
 butterknife.bind(this);
 setsupportactionbar(toolbar);
 getsupportactionbar().setdisplayhomeasupenabled(true);
 getsupportactionbar().setdisplayshowtitleenabled(false);
 toolbar.setnavigationonclicklistener(new view.onclicklistener() {
  @override
  public void onclick(view view) {
  onbackpressed();
  }
 });
 initdata();
 }

　　private void initrefresh() {
 appbarlayout.addonoffsetchangedlistener(new appbarlayout.onoffsetchangedlistener() {
  @override
  public void onoffsetchanged(appbarlayout appbarlayout, int verticaloffset) {
  if (verticaloffset >= 0) {
   swiperefreshlayout.setenabled(true);
  } else {
   swiperefreshlayout.setenabled(false);
  }
  }
 });
 swiperefreshlayout.setonrefreshlistener(new swiperefreshlayout.onrefreshlistener() {
  @override
  public void onrefresh() {
  initdata();
  swiperefreshlayout.setrefreshing(false);
  }
 });
 }

android:theme="@style/personalcard"

<style name="personalcard" parent="theme.appcompat.light.darkactionbar">
  <!-- customize your theme here. -->
  <item name="windowactionbar">false</item>
  <item name="windownotitle">true</item>
  <item name="colorprimary">@color/colorprimary</item>
  <item name="colorprimarydark">@color/colorprimarydark</item>
  <item name="coloraccent">@color/coloraccent</item>
 </style>

compilesdkversion 24
//------------------ 在线依赖开始 ----------------
compile 'com.android.support:appcompat-v7:24.2.0'
compile 'com.android.support:recyclerview-v7:24.2.0'
compile 'com.android.support:cardview-v7:24.2.0'
compile 'com.android.support:design:24.2.0'