Develop Reference

Why vertical orientation does not render images vertically?

My .xml file has the following code:
<?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:orientation="vertical"
android:id="#+id/root"
android:layout_width="match_parent"
android:layout_height="match_parent">
<android.support.v7.widget.RecyclerView
android:orientation="vertical"
android:id="#+id/image_list"
android:layout_width="match_parent"
android:layout_height="match_parent"/>
</LinearLayout>
However, the phone renders images as follows:
Why?

Are you setting a LayoutManager for the RecyclerView? See this documentation.
setLayoutManager
void setLayoutManager (RecyclerView.LayoutManager layout)
Set the RecyclerView.LayoutManager that this RecyclerView will use.
In contrast to other adapter-backed views such as ListView or GridView, RecyclerView allows client code to provide custom layout arrangements for child views. These arrangements are controlled by the RecyclerView.LayoutManager. A LayoutManager must be provided for RecyclerView to function.

Android-Last item of the ListView is not visible

I have added the ListView inside ViewPager, as soon as the page is loaded the first tab is selected and the last item of the list does not show up for the first time, its becoming visible when I go to next tab and come back. I would like to see all the items of the listview when its loaded for the first time. Please help me to fix this problem.
This is the xml for the listview -
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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">
<ListView
android:id="#+id/listview_categories"
android:layout_width="fill_parent"
android:divider="#color/light_gray_a1"
android:dividerHeight="0.667dp"
android:background="#color/white"
android:layout_height="fill_parent" />
</RelativeLayout>

add bottom padding like this and change fill_parent to match_parent
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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">
<ListView
android:id="#+id/listview_categories"
android:layout_width="match_parent"
android:divider="#color/light_gray_a1"
android:dividerHeight="0.667dp"
android:paddingBottom="40dp"
android:background="#color/white"
android:layout_height="match_parent" />
</RelativeLayout>

I had this issue. Just now I solved it. Look for android:layout_weight in all the Layouts you used and if it is set some non zero values like android:layout_weight="1" or android:layout_weight="0.91", then set them to zero like this,
android:layout_weight="0"

The last item in my recyclerview is being cut off does anyone know why?

This is my layout XML file, I have a pull to refresh, recyclerview and a coordinator layout, I inflate my items into this recyclerview.
<?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"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivitys.ViewPager.Fragments.Home">
<com.yalantis.phoenix.PullToRefreshView
android:id="#+id/pull_to_refresh"
android:layout_width="match_parent"
android:layout_height="match_parent">
<android.support.v7.widget.RecyclerView
android:id="#+id/fragment_dashboard_recycler"
android:layout_width="match_parent"
android:layout_height="match_parent">
</android.support.v7.widget.RecyclerView>
</com.yalantis.phoenix.PullToRefreshView>

update your recyclerview dependency to latest version in build.gradle file
then use "wrap_content" as height for recyclerview in your xml file

Enable intertial scroll in NestedScrollView (Android Studio)

I have a NestedScrollView (part of the default Scrolling Activity) that contains a CoordinatorLayout and RecyclerView to display cards with some information. The layout is designed to allow the cards to go off-screen if there are too many and have the user scroll down to them, however for some reason the scroll does not have momentum to it as it should. I looked around and a previous question told how to disable the intertial scroll in a ScrollView (Android ScrollView disable Inertial scrolling), so I tried to do the opposite:
NestedScrollView mgScrollView = (NestedScrollView) findViewById(R.id.my_games_scroll_view);
mgScrollView.setSmoothScrollingEnabled(true);
But this didn't accomplish it. I tested mgScrollView.setVerticalScrollBarEnabled(true); to see if I was even applying the code to the right view, and so it happens the scrollbars didn't show up either. So now I'm confused as to whether I'm even applying those methods to the right view, but since I don't have any other ScrollViews I'm not sure where it should be if I am incorrect. I know I can add scrollbars in the xml itself but I haven't found xml code for inertial scrolling. Is there a way to add inertia through Java or xml?
Here is the code for content_my_games.xml, which is where the layouts for the cards go (not to be confused with activity_my_games.xml, which houses code for the CollapsingToolbarLayout and FAB)
Thanks
<?xml version="1.0" encoding="utf-8"?>
<android.support.v4.widget.NestedScrollView 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/my_games_scroll_view"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="#string/appbar_scrolling_view_behavior"
tools:context="com.example.abhinav.sportswowandroid.MyGamesActivity"
tools:showIn="#layout/activity_my_games">
<RelativeLayout 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:layout_width="match_parent"
android:layout_height="wrap_content"
android:paddingLeft="16dp"
android:paddingRight="16dp"
android:paddingTop="16dp"
android:paddingBottom="16dp"
tools:context=".MyGamesActivity">
<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=".MyGamesActivity"
/>
<android.support.v7.widget.RecyclerView
android:id="#+id/recycler_view"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="android.support.design.widget.AppBarLayout$ScrollingViewBehavior"
/>
<android.support.design.widget.AppBarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
/>
</RelativeLayout>
</android.support.v4.widget.NestedScrollView>

Old question, but just ran into this myself. This solved it for me:
RecyclerView recyclerView = (RecyclerView) findViewById(R.id.recycler_view);
recyclerView.setNestedScrollingEnabled(false);

how to scroll pull to refresh scrollview in normal scrollview

Here is my layout xml.
<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/garae_scroll"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#color/background"
android:fillViewport="true"
android:focusableInTouchMode="false" >
<RelativeLayout>
...
<com.handmark.pulltorefresh.library.PullToRefreshScrollView>
<LinearLayout/>
</com.handmark.pulltorefresh.library.PullToRefreshScrollView>
</RelativeLayout>
</ScrollView>
I already tried the solution in this link:
ScrollView Inside ScrollView
However, it didn't work. How can do use child PullToRefreshScrollView??
Please help me.

If I understand your question, you want to implement a Pull to refresh in your Scrollview. Instead, to use the library you are using, I would suggest you to implement a SwipeRefreshLayout
https://developer.android.com/reference/android/support/v4/widget/SwipeRefreshLayout.html
It is a layout that implements a pull-to-refresh like in the application of Google+ or Gmail.
Here's an example implementing SwipeRefreshLayout in your xml:
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout
android:layout_width="match_parent" android:layout_height="match_parent"
xmlns:android="http://schemas.android.com/apk/res/android" >
<android.support.v4.widget.SwipeRefreshLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/swipe_container"
android:layout_width="match_parent"
android:layout_height="match_parent">
<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/garae_scroll"
android:layout_width="match_parent"
android:layout_height="wrap_content" >
</ScrollView>
</android.support.v4.widget.SwipeRefreshLayout>
</FrameLayout>
NOTE
It is highly not recommended to put a Scrollview/Listview inside a Scrollview/Listview. The first reason is about the performance and Romain Guy explains that in one video https://www.youtube.com/watch?v=wDBM6wVEO70