Develop Reference

How to make RecyclerView fix header when scrolling

I have a RecyclerView that has been filled with data. It's just that when I scroll, the header does not fix the toolbar into position and results go up.
How do I hide the toolbar header when scrolling? Or more easily create fixed scroll on RecyclerView when scrolling?
All my code runs well, it's just a problem with the header that goes up when the scroll
ActivityMain Layout :
<?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:id="#+id/main_content"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true"
tools:context="com.bertho.gmyl.MainActivity">
<android.support.design.widget.AppBarLayout
android:id="#+id/appbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:paddingTop="#dimen/appbar_padding_top"
android:theme="#style/AppTheme.AppBarOverlay">
<android.support.v7.widget.Toolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="?attr/colorPrimary"
app:layout_scrollFlags="scroll|enterAlways"
app:popupTheme="#style/AppTheme.PopupOverlay">
</android.support.v7.widget.Toolbar>
<android.support.design.widget.TabLayout
android:id="#+id/tabs"
app:tabBackground="#drawable/tab_selector"
app:tabIndicatorColor="#color/whiteColor"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
</android.support.design.widget.AppBarLayout>
<android.support.v4.view.ViewPager
android:id="#+id/viewpager"
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="end|bottom"
android:layout_margin="#dimen/fab_margin"
app:srcCompat="#android:drawable/ic_dialog_email" />
</android.support.design.widget.CoordinatorLayout>
RecyclerView Layout :
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="#string/appbar_scrolling_view_behavior">
<android.support.v7.widget.RecyclerView
android:id="#+id/rvArticle"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
</LinearLayout>
Result :

Try setting android:fitsSystemWindows="false" as it takes entire screen (including status bar) to draw activity.
For more info.

Recyclerview + viewpager, make toolbar collapse

I have a recyclerview inside a viewpager. I also have Tabs above that and a toolbar. I'd like to collapse those (or one of those I have to try it out) when I move the recyclerView down. Basically the same as here.
I'm having trouble to get this to work.
Here is what I have:
<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"
tools:context="com.cedric.testdesign.MainActivity">
<android.support.design.widget.AppBarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:theme="#style/AppTheme.AppBarOverlay">
<android.support.v7.widget.Toolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="?attr/colorPrimary"
app:popupTheme="#style/AppTheme.PopupOverlay" />
<android.support.design.widget.TabLayout
android:id="#+id/tabs"
style="#style/MyCustomTabLayout"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"/>
</android.support.design.widget.AppBarLayout>
<com.signpetitions.cedric.signpetitions.components.MyFab
android:id="#+id/fab"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="bottom|end"
android:layout_margin="#dimen/fab_margin"
android:src="#android:drawable/ic_dialog_email" />
<android.support.v4.view.ViewPager
android:id="#+id/viewpager"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="#string/appbar_scrolling_view_behavior"/>
</android.support.design.widget.CoordinatorLayout>
Inside the viewPager I have a fragment with a recycler view:
<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.RecyclerView
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="#+id/recyclerView"
app:layout_behavior="#string/appbar_scrolling_view_behavior" />

I added this to the toolbar :
app:layout_scrollFlags="scroll|enterAlways"
Then it works. The issue though is that when the statusbar is transparent the text behind the toolbar is visible. So the statusbar has to have a color.

Android CircularPageIndicator not displaying in Coordinator Layout

I am setting the CircularPagerIndicator underneath ViewPager using CoordinatorLayout but it is not displaying. Below is the XML
<?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:id="#+id/main_content"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true"
tools:context="mypackage.HomeActivity">
<android.support.design.widget.AppBarLayout
android:id="#+id/appbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:paddingTop="#dimen/appbar_padding_top"
android:theme="#style/AppTheme.AppBarOverlay">
<android.support.v7.widget.Toolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="?attr/colorPrimary"
app:layout_scrollFlags="scroll|enterAlways"
app:popupTheme="#style/AppTheme.PopupOverlay">
</android.support.v7.widget.Toolbar>
</android.support.design.widget.AppBarLayout>
<android.support.v4.view.ViewPager
android:id="#+id/container"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:paddingRight="#dimen/view_pager_padding"
android:paddingLeft="#dimen/view_pager_padding"
app:layout_behavior="#string/appbar_scrolling_view_behavior" />
<mypackage.CirclePageIndicator
android:id="#+id/indicator"
android:clickable="false"
android:layout_height="wrap_content"
android:layout_width="wrap_content"
app:radius="5dp"
app:fillColor="#FF888888"
app:pageColor="#88FF0000"
android:layout_centerHorizontal="true"
android:layout_alignParentBottom="true"/>
<android.support.design.widget.FloatingActionButton
android:id="#+id/fab"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="end|bottom"
android:layout_margin="#dimen/fab_margin"
android:src="#android:drawable/ic_dialog_email" />
</android.support.design.widget.CoordinatorLayout>
Below method is called my Activity from onCreate Method
private void displayCarts(){
mSectionPagerAdapter = new SectionPagerAdapter(getSupportFragmentManager(), mCartCount, cartMap);
mViewPager = (ViewPager) findViewById(R.id.container);
mViewPager.setAdapter(mSectionPagerAdapter);
mCartCountIndicator = (CirclePageIndicator) findViewById(R.id.indicator);
mCartCountIndicator.setViewPager(mViewPager);
}
Not Sure what's going wrong.
I followed the suggestion from this link : Android CirclePageIndicator not working
but adding an extra Relative or linear layout within coordinator layout jusr to show CircularPagerIndicator does not fit my need. Any suggestions?

In a CoordinatorLayout, the actual scrollable view expands under the screen so on scroll it will shift up as toolbar hides. Anything below that won't be visible. You can try android:layout_gravity="bottom|center_horizontal" to place it at bottom of screen
<application.payrange.com.payrage.ui.CirclePageIndicator
android:id="#+id/indicator"
android:clickable="false"
android:layout_height="wrap_content"
android:layout_width="wrap_content"
android:layout_gravity="bottom|center_horizontal"
app:radius="5dp"
app:fillColor="#FF888888"
app:pageColor="#88FF0000" />
Moreover you can place this inside a container an give it a background color to make it look better. Also you can use Behavior to give it scroll effect just like Toolbar

well, for now I am falling back to adding linearlayout for View Pager and PagerIndicator. I added topmargin to the Linearlayout to display the whole view pager. Not the best possible solution , but will do the trick for now.
<?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:id="#+id/main_content"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true"
tools:context="mypackage.HomeActivity">
<android.support.design.widget.AppBarLayout
android:id="#+id/appbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:paddingTop="#dimen/appbar_padding_top"
android:theme="#style/AppTheme.AppBarOverlay">
<android.support.v7.widget.Toolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="?attr/colorPrimary"
app:layout_scrollFlags="scroll|enterAlways"
app:popupTheme="#style/AppTheme.PopupOverlay">
</android.support.v7.widget.Toolbar>
</android.support.design.widget.AppBarLayout>
<LinearLayout android:layout_width="match_parent"
android:orientation="vertical" android:layout_gravity="center_horizontal"
android:layout_height="match_parent"
android:layout_marginTop="70dp">
<android.support.v4.view.ViewPager
android:id="#+id/container"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1"
android:paddingRight="#dimen/view_pager_padding"
android:paddingLeft="#dimen/view_pager_padding"
app:layout_behavior="#string/appbar_scrolling_view_behavior" />
<mypackage.CirclePageIndicator
android:id="#+id/indicator"
android:clickable="false"
android:layout_height="wrap_content"
android:layout_width="wrap_content"
app:radius="5dp"
app:fillColor="#color/default_circle_indicator_stroke_color"
app:pageColor="#color/circlepageindicator_fill_color"
android:layout_margin="#dimen/fab_margin"/>
</LinearLayout>>
<android.support.design.widget.FloatingActionButton
android:id="#+id/fab"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="end|bottom"
android:layout_margin="#dimen/fab_margin"
android:src="#android:drawable/ic_dialog_email" />
</android.support.design.widget.CoordinatorLayout>

Android, TabLayout miscalculates height, won't show bottom of layout

I'm working on a tab activity in my app, but it seems that the tabs are using the wrong height (thinking the layout is about half an inch taller than it is on any device) and as a result any vertical centering is off on the low side, and my scrollviews are messed up because the screen won't scroll far enough down to see the bottom of the view. I have tried tinkering with the layout_height on any relevant class I can think of and hiding the tabs, but nothing helps and I cant find this problem anywhere else. I generated the default template for a TabLayout activity in Android Studio 1.4.
activity_main
<?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/main_content"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true"
tools:context=".MainActivity">
<android.support.design.widget.AppBarLayout
android:id="#+id/appbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:paddingTop="#dimen/appbar_padding_top"
android:theme="#style/AppTheme.AppBarOverlay">
<android.support.v7.widget.Toolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="?attr/colorPrimary"
app:popupTheme="#style/AppTheme.PopupOverlay"
app:layout_scrollFlags="scroll|enterAlways">
</android.support.v7.widget.Toolbar>
<android.support.design.widget.TabLayout
android:id="#+id/tabs"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:tabIndicatorColor="#color/colorPrimaryDark" />
</android.support.design.widget.AppBarLayout>
<android.support.v4.view.ViewPager
android:id="#+id/container"
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="end|bottom"
android:layout_margin="#dimen/fab_margin"
android:src="#drawable/ic_youtube_searched_for_white_18dp"
android:visibility="gone"/>
</android.support.design.widget.CoordinatorLayout>
fragment_main
<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#color/white"
tools:context="com.example.ggould.flyingfood.HistoryFragment">
<LinearLayout
android:id="#+id/main_layout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
//other stuff
</LinearLayout
</ScrollView>

On activity_main you can create a RelativeLayout. Put your ViewPager and AppBarLayout inside RelativeLayout and set your ViewPager like this:
<android.support.v4.view.ViewPager
android:id="#+id/container"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_below="#+id/appbar"/>

<android.support.v7.widget.Toolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="?attr/colorPrimary"
app:popupTheme="#style/AppTheme.PopupOverlay"
app:layout_scrollFlags="scroll|enterAlways">
</android.support.v7.widget.Toolbar>
you have to wrap content for the widget.toolbar

New android Support Design Library, scroll tablayout offscreen not working

Trying to use the new support design library. In my layout I want the ToolBar to stay at the top of the screen, but have the TabLayout go off the screen when the user scrolls down. But it looks like the ViewPager goes underneath the AppBarLayout. I used this blog post for reference
https://medium.com/ribot-labs/exploring-the-new-android-design-support-library-b7cda56d2c32
This is the layout, within the ViewPager holds Fragments that consist of recycler views
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#color/material_grey50"
android:clickable="true">
<android.support.design.widget.CoordinatorLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<android.support.v4.view.ViewPager
android:id="#+id/pager"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="#+id/tabLayout" />
<android.support.design.widget.AppBarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<android.support.v7.widget.Toolbar
android:id="#+id/toolbar_list"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="?attr/colorPrimary"
android:theme="#style/ThemeOverlay.AppCompat.Dark.ActionBar"
app:popupTheme="#style/ThemeOverlay.AppCompat.Light" />
<android.support.design.widget.TabLayout
android:id="#+id/tabLayout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="#+id/toolbar_list"
android:background="?attr/colorPrimary"
android:scrollbars="horizontal"
android:theme="#style/ThemeOverlay.AppCompat.Dark.ActionBar"
app:layout_scrollFlags="scroll|enterAlways"
app:tabGravity="center" />
</android.support.design.widget.AppBarLayout>
<android.support.design.widget.FloatingActionButton
android:id="#+id/fab_post"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_alignParentRight="true"
android:layout_gravity="bottom|right"
android:layout_marginBottom="16dp"
android:layout_marginRight="16dp"
android:elevation="3dp"
android:src="#drawable/ic_videocam_white_36dp"
app:backgroundTint="#color/accent"
app:fabSize="normal" />
</android.support.design.widget.CoordinatorLayout>

Don't forget to set this in the viewpager:
app:layout_behavior="#string/appbar_scrolling_view_behavior"