折叠式状态栏（实现代码）

一、在Xml布局中

<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:orientation="vertical"
    tools:context="com.example.asus.androidfire.WebActivity">
    <android.support.design.widget.AppBarLayout
        android:layout_width="match_parent"
        android:id="@+id/appBar"
        android:fitsSystemWindows="true"
        android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar"
        android:layout_height="206dp">
        <android.support.design.widget.CollapsingToolbarLayout
            android:id="@+id/collapsing_toolbar"
            android:fitsSystemWindows="true"
            app:title="AndroidFire"
            app:contentScrim="#FFEDAA3d"
            app:expandedTitleMarginEnd="64dp"
            app:expandedTitleMarginStart="48dp"
            app:layout_scrollFlags="scroll|exitUntilCollapsed"
            android:layout_width="match_parent"
            android:layout_height="206dp">
            <ImageView
                android:id="@+id/mShouYe_ItemClick_image"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:background="#FFEDAA3d"
                android:fitsSystemWindows="true"
                android:scaleType="centerCrop"
                android:src="@drawable/logo"
                app:layout_collapseMode="parallax" />

            <android.support.v7.widget.Toolbar
                android:id="@+id/toolbar"
                android:layout_width="match_parent"
                android:layout_height="?attr/actionBarSize"
                app:layout_collapseMode="pin"
                app:popupTheme="@style/ThemeOverlay.AppCompat.Light" />

        </android.support.design.widget.CollapsingToolbarLayout>
    </android.support.design.widget.AppBarLayout>

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

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:gravity="center_horizontal"
            android:orientation="vertical"
            android:paddingTop="24dp">

            <LinearLayout
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:textSize="18sp">

                <TextView
                    android:id="@+id/mShouYeItemWangZhang"
                    android:layout_width="wrap_content"

                    android:layout_height="wrap_content"
                    android:text="Android Fire 介绍：" />

                <TextView
                    android:id="@+id/mShouYe_ItemClick_ShiJiang"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:text="text" />
            </LinearLayout>


            <WebView
                android:id="@+id/mShouYe_ItemClick_WebView"
                android:layout_width="match_parent"
                android:layout_height="match_parent" />
        </LinearLayout>

    </android.support.v4.widget.NestedScrollView>

    <android.support.design.widget.FloatingActionButton
        android:id="@+id/mShouYe_ItemClick_Floating"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:src="@drawable/ic_share"
        app:backgroundTint="#ed5b93"
        app:elevation="10dp"
        app:fabSize="mini"
        app:layout_anchor="@+id/nestedScrollView"
        app:layout_anchorGravity="right|top"
        app:pressedTranslationZ="5dp"
        app:rippleColor="#e7aa59" />


</android.support.design.widget.CoordinatorLayout>

二、在Activity中

public class WebActivity extends AppCompatActivity implements View.OnClickListener {


    private ImageView mShouYe_ItemClick_image;
    private Toolbar toolbar;
    private CollapsingToolbarLayout collapsing_toolbar;
    private AppBarLayout appBar;
    private TextView mShouYeItemWangZhang;
    private TextView mShouYe_ItemClick_ShiJiang;
    private WebView mShouYe_ItemClick_WebView;
    private NestedScrollView nestedScrollView;
    private FloatingActionButton mShouYe_ItemClick_Floating;

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

    private void initView() {


        mShouYe_ItemClick_image = (ImageView) findViewById(R.id.mShouYe_ItemClick_image);
        mShouYe_ItemClick_image.setOnClickListener(this);
        toolbar = (Toolbar) findViewById(R.id.toolbar);
        toolbar.setOnClickListener(this);
        toolbar.setNavigationIcon(R.drawable.ic_arrow_back);
        setSupportActionBar(toolbar);

        toolbar.setNavigationOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
               finish();
            }
        });

        collapsing_toolbar = (CollapsingToolbarLayout) findViewById(R.id.collapsing_toolbar);
        collapsing_toolbar.setOnClickListener(this);
        appBar = (AppBarLayout) findViewById(R.id.appBar);
        appBar.setOnClickListener(this);
        mShouYeItemWangZhang = (TextView) findViewById(R.id.mShouYeItemWangZhang);
        mShouYeItemWangZhang.setOnClickListener(this);
        mShouYe_ItemClick_ShiJiang = (TextView) findViewById(R.id.mShouYe_ItemClick_ShiJiang);
        mShouYe_ItemClick_ShiJiang.setOnClickListener(this);
        mShouYe_ItemClick_WebView = (WebView) findViewById(R.id.mShouYe_ItemClick_WebView);
        mShouYe_ItemClick_WebView.setOnClickListener(this);
        nestedScrollView = (NestedScrollView) findViewById(R.id.nestedScrollView);
        nestedScrollView.setOnClickListener(this);
        mShouYe_ItemClick_Floating = (FloatingActionButton) findViewById(R.id.mShouYe_ItemClick_Floating);
        mShouYe_ItemClick_Floating.setOnClickListener(this);
        Intent intent = getIntent();
        String tupian = intent.getStringExtra("tupian");
        Glide.with(this).load(tupian).into(mShouYe_ItemClick_image);
        final String web = intent.getStringExtra("web");
        mShouYe_ItemClick_WebView.loadUrl(web);
        mShouYe_ItemClick_WebView.setWebViewClient(new WebViewClient() {
            @Override
            public boolean shouldOverrideUrlLoading(WebView view, WebResourceRequest request) {
                mShouYe_ItemClick_WebView.loadUrl(web);
                return true;
            }
        });


    }


    @Override
    public void onClick(View v) {
        switch (v.getId()) {
            case R.id.mShouYe_ItemClick_Floating:
                Intent intent = new Intent(Intent.ACTION_SEND);
                intent.setType("text/plain");
                intent.putExtra(Intent.EXTRA_SUBJECT, "分享");
                intent.putExtra(Intent.EXTRA_TEXT, "喜欢你傻傻的可爱");
                intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
                startActivity(Intent.createChooser(intent, "分享"));

                break;
        }
    }
}