Display content under toolbar

Question

Hello I\'m attempting to simply put my content below the toolbar but at the moment when I run my application some of the content is hidden behind it when it should be below it.<

Answer 1

Many ViewGroups allow their children to overlap. These include FrameLayout, RelativeLayout, CoordinatorLayout, and DrawerLayout. One that does not allow its children to overlap is LinearLayout.

The answer to your question really depends on what the end result should be. If you are trying to just have a Toolbar that is always on screen and some content below it, then you don't need a CoordinatorLayout and AppBarLayout at all, you can just use a vertical LinearLayout with two children:

<LinearLayout android:orientation="vertical" ...>
    <android.support.v7.widget.Toolbar
        android:layout_width="match_parent"
        android:layout_height="?attr/actionBarSize"
        ... />

    <FrameLayout 
        android:id="@+id/fragment_container"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1"
        ... />
</LinearLayout>

Note layout attributes of the FrameLayout.

If you want to do the fancy stuff where the toolbar scrolls on and off the screen as you scroll the content, then you need an AppBarLayout and you need to give your content area a special attribute like this:

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

        <android.support.v7.widget.Toolbar
            android:layout_width="match_parent"
            android:layout_height="?attr/actionBarSize"
            app:layout_scrollFlags="scroll"
            ... />
    </android.support.design.widget.AppBarLayout>

    <FrameLayout 
        android:id="@+id/fragment_container"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:layout_behavior="@string/appbar_scrolling_view_behavior"
        ... />
</android.support.design.widget.CoordinatorLayout>

Answer 2

app:layout_behavior="@string/appbar_scrolling_view_behavior"

Add this code to your frame tag

Answer 3

As @Brian Hoang and @Karakuri said using the layout_behaviour property:

app:layout_behavior="@string/appbar_scrolling_view_behavior"

seems to be a very good solution. Even if you don't have any animations at the moment but you plan to have in the future then you can still keep the CoordinatorLayout and an AppBarLayout in case you want to add animations in the future.

---

What the property seems to do in general from my understanding, is to calculate the height of the whole AppBarLayout UI component. The UI component that uses the layout_behaviour property with the @string/appbar_scrolling_view_behaviour will automatically be shown exactly below the AppBarLayout regardless of what the height is.

In this way there is no need to hardcode any top margins in the UI that is supposed to be under the AppBarLayout.

In the code below the include_app_bar_with_tabs_layout (AppBarLayout) has a fixed height of 200dp (it can be wrap_content or anything else). Then the RelativeLayout that contains the content of the screen uses the layout_behaviour property.

---

Have a look at the code and UI image below:

<?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"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:fitsSystemWindows="true">

    <include
        layout="@layout/include_app_bar_with_tabs_layout"
        android:layout_width="match_parent"
        <!-- this can be anything, even wrap_content -->
        android:layout_height="200dp" />

    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:background="@color/Green"
        <!-- this tells it to be below the include_app_bar_with_tabs_layout (AppBarLayout) -->
        app:layout_behavior="@string/appbar_scrolling_view_behavior"> 

        <android.support.v4.view.ViewPager
            android:id="@+id/view_pager"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_above="@+id/adView" />

        <com.google.android.gms.ads.AdView
            android:id="@id/adView"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentBottom="true"
            android:layout_centerHorizontal="true"
            app:adSize="BANNER"
            app:adUnitId="@string/banner_ad_unit_id"
            tools:background="@color/green"
            tools:layout_height="50dp" />
    </RelativeLayout>
</android.support.design.widget.CoordinatorLayout>