Android 顶部悬停

效果主要靠布局来实现的，主要使用了CoordinatorLayout+AppBarLayout+CollapsingToolbarLayout

<?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"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <android.support.design.widget.AppBarLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:theme="@style/AppTheme.AppBarOverlay">

        <android.support.design.widget.CollapsingToolbarLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:fitsSystemWindows="true"
            app:contentScrim="?attr/colorPrimary"
            app:layout_collapseMode="parallax"
            app:layout_collapseParallaxMultiplier="0.7"
            app:layout_scrollFlags="scroll|exitUntilCollapsed">

            <ImageView
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:src="@drawable/wenyi" />
        </android.support.design.widget.CollapsingToolbarLayout>
        <!--悬停部分-->
        <android.support.design.widget.TabLayout
            android:id="@+id/tablayout"
            android:layout_width="match_parent"
            android:layout_height="wrap_content">
        </android.support.design.widget.TabLayout>
    </android.support.design.widget.AppBarLayout>

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

        <TextView
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="@string/str"
            android:textSize="20sp" />
    </android.support.v4.widget.NestedScrollView>
</android.support.design.widget.CoordinatorLayout>

Activity里面主要就是对TabLayout 的设置

;
    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_coor);
        mTabLayout= (TabLayout) findViewById(R.id.tablayout);
        mTabLayout.addTab(mTabLayout.newTab().setText("分类"));
        mTabLayout.addTab(mTabLayout.newTab().setText("排序"));
        mTabLayout.addTab(mTabLayout.newTab().setText("价格"));
        mTabLayout.setTabTextColors(Color.BLACK,Color.RED);
        mTabLayout.setSelectedTabIndicatorColor(Color.RED);
        mTabLayout.setBackgroundColor(Color.GREEN);