android android-fragments toolbar android-coordinatorlayout

Translucent/Transparent status bar + CoordinatorLayout + Toolbar + Fragment

I have following setup:

I'm using AppCompat
MainActivity, that holds a fragment and has a toolbar, that's hiding when scrolling down
Fragment with RecyclerView
all views that should fit the screen have the according android:fitsSystemWindows="true" in the xml layout

The problem is, I can't get the statusbar transparent in this case. What I do is following:

Create the activity and call setContent

Then I try to adjust the activity to programmatically get a translucent toolbar like following:

@TargetApi(Build.VERSION_CODES.LOLLIPOP)
public void themeNavAndStatusBar(Activity activity)
{
    if (Build.VERSION.SDK_INT < Build.VERSION_CODES.LOLLIPOP)
        return;

    Window w = activity.getWindow();
    w.addFlags(WindowManager.LayoutParams.FLAG_DRAWS_SYSTEM_BAR_BACKGROUNDS);
    w.setFlags(
            WindowManager.LayoutParams.FLAG_TRANSLUCENT_NAVIGATION,
            WindowManager.LayoutParams.FLAG_TRANSLUCENT_NAVIGATION);
    w.setFlags(
            WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS,
            WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);
    w.setNavigationBarColor(activity.getResources().getColor(android.R.color.transparent));

    w.setStatusBarColor(activity.getResources().getColor(android.R.color.transparent));
}

Replace the placeholder in the activity (@+id/frame_container) with the fragment

The statusbar is solid colored in this case, and the views are not drawn underneath it... Why?

What I want

I want a toolbar, that is scrolled of the screen and hiding completely while the content underneath this toolbar should fitScreen and be drawn behind the transparent nav bar.

Layouts

Here's my main activity:

<android.support.design.widget.CoordinatorLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:id="@+id/clMain"
    android:fitsSystemWindows="true"
    android:background="?attr/main_background_color"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <android.support.design.widget.AppBarLayout
        android:id="@+id/appBarLayout"
        android:fitsSystemWindows="true"
        android:background="@null"
        app:elevation="0dp"
        app:contentInsetLeft="0dp"
        app:contentInsetStart="0dp"
        android:layout_width="match_parent"
        android:layout_height="wrap_content">

        <android.support.v7.widget.Toolbar
            android:id="@+id/toolbar"
            android:layout_width="match_parent"
            android:layout_height="?attr/actionBarSize"
            android:background="?attr/colorPrimary"
            android:elevation="4dp"
            android:theme="?actionBarThemeStyle"
            app:popupTheme="?actionBarPopupThemeStyle"
            app:layout_scrollFlags="scroll|enterAlways">

            <LinearLayout
                android:orientation="vertical"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content">

                <LinearLayout
                    android:orientation="horizontal"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content">

                    <ImageView
                        android:id="@+id/ivToolbarDataSource"
                        android:layout_gravity="center_vertical"
                        android:layout_marginRight="2dp"
                        android:layout_width="24dp"
                        android:layout_height="24dp" />

                    <TextView
                        android:id="@+id/tvToolbarTitle"
                        style="@style/TextAppearance.AppCompat.Widget.ActionBar.Title"
                        android:theme="?actionBarThemeStyle"
                        android:layout_gravity="center_vertical"
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content" />

                </LinearLayout>

                <TextView
                    android:id="@+id/tvToolbarSubTitle"
                    style="@style/TextAppearance.AppCompat.Widget.ActionBar.Subtitle"
                    android:theme="?actionBarThemeStyle"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content" />

            </LinearLayout>



        </android.support.v7.widget.Toolbar>

        <!-- BUG: http://stackoverflow.com/questions/30541409/coordinatorlayoutappbarlayout-does-not-draw-toolbar-properly -->
        <View
            android:layout_width="fill_parent"
            android:layout_height="1dp"/>

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

    <FrameLayout
        android:id="@+id/frame_container"
        android:fitsSystemWindows="true"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:layout_behavior="@string/appbar_scrolling_view_behavior" />

    <android.support.design.widget.FloatingActionButton
        android:id="@+id/fab"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="bottom|right"
        android:layout_margin="32dp"
        android:src="@drawable/ic_local_offer_white_24dp"
        app:backgroundTint="?attr/colorPrimary"
        app:borderWidth="0dp"
        app:fabSize="normal"
        app:rippleColor="?attr/colorPrimaryDark"
        app:layout_anchorGravity="bottom|right|end"
        app:layout_behavior="com.test.classes.ScrollAwareFABBehavior"/>

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

And here is my fragment, that will be placed in the main activity:

<RelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:fitsSystemWindows="true"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <android.support.v4.widget.SwipeRefreshLayout
        android:id="@+id/srlImages"
        android:fitsSystemWindows="true"
        android:layout_width="match_parent"
        android:layout_height="match_parent">

        <android.support.v7.widget.RecyclerView
            android:id="@+id/rvImages"
            android:fitsSystemWindows="true"
            android:layout_width="match_parent"
            android:layout_height="match_parent" />

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

    <TextView
        android:id="@+id/tvEmpty"
        android:gravity="center"
        android:layout_centerInParent="true"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />

</RelativeLayout>

EDIT - Screenshots

I use a light/dark base theme and theme everything by hand (because the user can select any color as primary/accent color), so don't mind that the toolbar is white (it's the default's theme background color and primary color). I added a black border as well so that you see where the activity ends...

First Screenshot: Shows the toolbar, nothing is scrolled
Second Screenshot: I just started scrolling => the toolbar now should scroll away
Third Screenshot: the main content should now scroll underneath the nav bar...

In the end, I'll of course make the toolbar and navbar semi transparent for a better visual effect...

Solution

For me, the reason was not that it did not work per se, but that I use the material drawer library from Mike Penz and this library does use fullscreen + offset + custom background behind the toolbar so I had to solve the problem respecting that special setup...

I'll reward the points to the in my opinion most informative answer though...