Xml文件：

 <?xml version="1.0" encoding="utf-8"?>

<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"

    xmlns:tools="http://schemas.android.com/tools"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:id="@+id/activity_news"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.bc.liyahong.activity.NewsActivity">
    <android.support.design.widget.AppBarLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:fitsSystemWindows="true">
        <android.support.design.widget.CollapsingToolbarLayout
            android:id="@+id/newsActivity_ToolbarLayout"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            app:contentScrim="@color/toolbar_bg"
            app:expandedTitleMarginStart="45dp"
            app:layout_scrollFlags="scroll|exitUntilCollapsed">
            <ImageView
                android:id="@+id/newsActivity_image"
                android:fitsSystemWindows="true"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:src="http://www.mamicode.com/@drawable/ic_image_loading"
                android:scaleType="centerCrop"
                app:layout_collapseMode="parallax"
                app:layout_collapseParallaxMultiplier="0.7"/>
            <android.support.v7.widget.Toolbar
                android:id="@+id/newsActivity_toolbar"
                android:layout_width="match_parent"
                android:layout_height="55dp"
                app:layout_collapseMode="pin">
            </android.support.v7.widget.Toolbar>
        </android.support.design.widget.CollapsingToolbarLayout>
    </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">
    </android.support.v4.widget.NestedScrollView>
</android.support.design.widget.CoordinatorLayout>

代码中：

setSupportActionBar(mToolbar);//设置系统的ActionBar为当前的Toorbar
getSupportActionBar().setDisplayHomeAsUpEnabled(true);//显示返回按钮

mToolbar.setNavigationOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View view) {
        onBackPressed();//返回上一个页面
    }
});
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
    Window window = getWindow();
    window.clearFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);
    window.getDecorView().setSystemUiVisibility(View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN | View.SYSTEM_UI_FLAG_LAYOUT_STABLE);
    window.addFlags(WindowManager.LayoutParams.FLAG_DRAWS_SYSTEM_BAR_BACKGROUNDS);
    window.setStatusBarColor(Color.TRANSPARENT);
}

ToolbarLayout的使用