toolbar

I've made an app using Android Design Library , with a Toolbar and TabLayout. Actually 2 tabs are present, both with 2 RecyclerView, that automatically collapse the Toolbar when scrolled. My question is: can I disable Toolbar collapsing when RecyclerView has few items and completely fits the screen (like in TAB 2)? I've seen a lot of examples like CheeseSquare , made by a Google employee where the issue is still present: even if the RecyclerView has just 1 item, the toolbar keeps hiding on scroll. I think I can just find out if the first item of the RecyclerView is visible on screen and if yes

I want to change CollapsingToolbarLayout font size and its typeface. How I can achieve that? Update Before we dive into the code let's first decide the textSize for our CollapsingToolbarLayout . Google published a website called material.io , this website also explains the best way on how to deal with Typography . The article mentioned about "Heading" category which also explains the recommended font size to use in sp . Although the article never mentioned the recommended CollapsingToolbarLayout's expanded size but the library com.android.support:design provides a TextAppearance for our case.

I tried to remove the shadow below the toolbar with the Theme.AppCompat.Light.NoActionBar, using every recommendation of people who have ever answer it before, but no one worked. I tried <item name="android:windowContentOverlay">@null</item> and <item name="android:windowContentOverlay">@drawable/solid_line</item> .... <shape xmlns:android="http://schemas.android.com/apk/res/android"android:shape="rectangle"> <solid android:color="@color/accueil_color" /> <size android:height="15dp" /> </shape> and with this, android:elevation="0dp" the shadow goes from the top of the screen but not disapear.

I am trying to achieve an effect like WhatsApp has, where the Toolbar (when scrolled) will clip into view magnetlike, or out of view magnetlike. What I have im my MainActivity XML: DrawerLayout - Base Layout CoordinatorLayout - Layout for the Appbar and Toolbar and Tabs AppBarLayout - For holding Toolbar and Tabs Toolbar - has THIS flag: app:layout_scrollFlags="scroll|enterAlways" SlidingTabLayout - Displays tabs ViewPager - For tabs RecyclerView - For coordinatorlayout Now dont get me wrong, it works, when I scroll down the toolbar gets pushed out of view but say I stop scrolling halfway,

I am using a toolbar as my actionbar in an activity. I am trying to add the method getActionBar().setDisplayHomeAsUpEnabled(true); to the Activity.java file for Up navigation for older devices. The method produces the following error message in Android Studio: Method invocation may produce java.lang.NullPointerException The Up navigation on the toolbar works fine on newer devices...now I'm trying to figure out how to make sure it will work for older devices. Please advise. From build.gradle: dependencies { compile "com.android.support:appcompat-v7:22.1.0" } From AndroidManifest.xml: android