顶部悬浮

效果图

 布局

<?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>

java

    @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);
            }
        });
    }

 注意事项

1.清单文件需要配置

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>

2.gradle配置需要24以上

    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'

3.recyclerView的下滑和swipRefreshLayout的下拉刷新会冲突，所以需要监听appBarLayout的位移，当位移等于0时，即appBarLayout全部展示，可以下拉刷新

4.string.xml

<string name="appbar_scrolling_view_behavior" translatable="false">android.support.design.widget.AppBarLayout$ScrollingViewBehavior</string>

切记