沉浸式（图片内容延伸状态栏）

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设置系统UI参数和修改Toolbar

    private fun fullScreen(activity: Activity) {
        //设置系统UI参数
        //setSystemUiVisibility(int visibility)传入的实参类型如下：
        //1.View.SYSTEM_UI_FLAG_VISIBLE ：状态栏和Activity共存，Activity不全屏显示。也就是应用平常的显示画面
        //2.View.SYSTEM_UI_FLAG_FULLSCREEN ：Activity全屏显示，且状态栏被覆盖掉
        //3. View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN ：Activity全屏显示，但是状态栏不会被覆盖掉，而是正常显示，只是Activity顶端布   局会被覆盖住
        //4.View.INVISIBLE ： Activity全屏显示，隐藏状态栏
        //5.View.SYSTEM_UI_FLAG_LAYOUT_STABLE  ： 稳定布局
        //6.View.SYSTEM_UI_FLAG_LIGHT_STATUS_BAR ：改变状态栏字体颜色 (android 6.0以上有效)
        val window: Window = activity.window
        window.clearFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS)
        val decorView: View = window.decorView
        val option = View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN or View.SYSTEM_UI_FLAG_LAYOUT_STABLE or View.SYSTEM_UI_FLAG_LIGHT_STATUS_BAR
        decorView.systemUiVisibility = option
        //给系统状态栏着色：
        window.addFlags(WindowManager.LayoutParams.FLAG_DRAWS_SYSTEM_BAR_BACKGROUNDS)
        //给系统状态栏设置透明颜色：
        window.statusBarColor = Color.TRANSPARENT

        //获取Toolbar控件，获取状态栏高度，给Toolbar控件的MarginTop设置状态栏的高度
        //Toolbar父控件为CollapsingToolbarLayout
        val layoutParams: CollapsingToolbarLayout.LayoutParams = coordinator_toolbar.layoutParams as CollapsingToolbarLayout.LayoutParams
        layoutParams.setMargins(0, getStatusBarHeight(), 0, 0)
        coordinator_toolbar.layoutParams = layoutParams
    }

获取状态栏高度

    fun getStatusBarHeight(): Int {
        var result = 0
        val resourceId = resources.getIdentifier("status_bar_height", "dimen", "  ")
        if (resourceId > 0) {
            result = resources.getDimensionPixelSize(resourceId)
        }
        return result
    }

布局：

<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"
    tools:context=".ui.index.PhotoAlbumDetailActivity">

    <android.support.design.widget.AppBarLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content">


        <android.support.design.widget.CollapsingToolbarLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            app:collapsedTitleTextAppearance="@style/AlbumCollapsedTitle"
            app:contentScrim="@color/white"
            app:expandedTitleTextAppearance="@style/AlbumExpandedTitle"
            app:layout_scrollFlags="scroll|exitUntilCollapsed">

            <RelativeLayout
                android:layout_width="match_parent"
                android:layout_height="wrap_content">

                <ImageView
                    android:id="@+id/iv_top_bg"
                    android:layout_width="match_parent"
                    android:layout_height="240dp"
                    android:scaleType="centerCrop"
                    android:src="@drawable/default_square_image_1" />

            </RelativeLayout>

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

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


    <android.support.v7.widget.RecyclerView
        android:id="@+id/recyclerView"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:paddingLeft="@dimen/margin_small"
        android:paddingRight="@dimen/margin_small"
        android:background="@color/white"
        app:layout_behavior="@string/appbar_scrolling_view_behavior" />

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