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Cannot find added elements in Tabbed Activity

I created a Tabbed Activity template project using Android Studio.
Then I created a LinearLayout with a nested TextView on it:
<LinearLayout
android:id="#+id/updateView"
android:layout_width="match_parent"
android:layout_height="20dp"
android:layout_marginTop="707dp"
android:orientation="vertical">
<TextView
android:id="#+id/updateTextView"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="right"
android:text="TextView" />
</LinearLayout>
This view is shown on preview, but there's none of it in the built app.
When I try to get a reference to it from my code:
LinearLayout lastUpdate = findViewById(R.id.updateView)
I get null in runtime.
So, how can I modify the code?
Preview screenshot

I solved my problem by moving xml code of LinearLayout upper, than code of AppBarLayout, and modification of dynamic pixels (dp) of ViewPager and my textView

RecyclerView animates items all at once instead of one by one

My Problem
I've been trying to get my Recycler View's items to animate as I scroll down. These items are loaded from a local XML and passed through my custom adapter.
I'm using this library for my adapter animation
I noticed that no matter what I tried, the items would just not animate at all, or they would animate all at once (every item would slide in on screen at the same time).
What I've Tried So Far
Utilizing the library I mentioned, I tried animating items in my RecyclerView.Adapter.
> IndexFragment.java snippet
//Create an adapter
SongAdapter adapter = new SongAdapter(songs, getContext());
//Set adapter
AlphaInAnimationAdapter alphaAdapter = new AlphaInAnimationAdapter(adapter);
alphaAdapter.setFirstOnly(false);
recyclerView.setAdapter(adapter);
recyclerView.setHasFixedSize(true);
This one failed somehow. I also tried the setItemAnimator method which also failed.
recyclerView.setItemAnimator(new SlideInLeftAnimator());
Layout Structure
So I assume it has something to do with my RecyclerView being inside of two NestedScrollView's.
Another person seemed to be having a similar issue
Below are some portions of my layout files
activity_main.xml
....
<!-- Fragment Container -->
<android.support.v4.widget.NestedScrollView
android:id="#+id/contentContainer"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
....
This is where I put my fragments
index_fragment.xml
<?xml version="1.0" encoding="utf-8"?>
<android.support.v4.widget.NestedScrollView
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/nestedScrollView"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<android.support.v7.widget.RecyclerView
android:id="#android:id/list"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
</android.support.v4.widget.NestedScrollView>
This is pretty much my Recyclerview and its parent Nested Scrollview.
item_song.xml
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<LinearLayout
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginBottom="1dp">
<!--I have two text views in here. Removed them just for this snippet -->
</LinearLayout>
<!-- This displays a background on each item when I press them AKA touch effects -->
<View
android:layout_width="match_parent"
android:layout_height="match_parent"
android:focusable="true"
android:clickable="true"
android:background="?android:attr/selectableItemBackground" />
</FrameLayout>
This is the structure of each item in the Recyclerview. I inflate this layout for each item. Pretty straightforward.
Any ideas as to what I could do to solve this issue? Thanks.

So after much testing, I finally came up with a solution that worked.
Change the fragment container in activity_main.xml from NestedScrollView to RelativeLayout or perhaps LinearLayout.
Remove the parent NestedScrollView and keep only the RecyclerView in index_fragment.xml.
Animations now work at last. Yay!
Apparently, it is a bad idea to put your RecyclerView inside of a NestedScrollView.
I read somewhere that because of having to load the proper height of its child layout, the NestedScrollView has to wait for it to completely load, in order to know the total height of the RecyclerView. However, I'm not totally sure if that's the reason, so feel free to correct me.
Hope this helps someone!

Android: Recyclerview not resizing when softinput keyboard appears

I have an activity that contains a fragment and the fragment contains a customview. The customview contains an edittext and directly below it a recyclerview with height of match_parent. When the user gets focus on the edittext a softinput keyboard appears.. unfortunately this keyboard hides half the recyclerview underneath it. I want the recyclerview to resize to the remaining visible height of the screen (under the edittext) so that items in the list aren't hidden by the keyboard.
I've tried setting adjustresize for the activity in the manifest but it has no effect:
android:windowSoftInputMode="adjustResize"
I've tried setting my app theme to a base theme (in case something in my custom theme was causing a problem) - no effect:
android:theme="#style/Theme.AppCompat.NoActionBar"
I've checked to make sure there are no framelayouts anywhere down the hierarchy to the view that has to be resized (I read an SO thread that it could be a problem) - there are none.
I've checked the activity, the fragment, the customview and every adapter connected to make sure that I'm not calling getWindow anywhere (I'm not).
The customview is inflated at runtime from a viewstub. Could this have a connection?
Edit:
contents of the parent:
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/parent_root"
android:layout_width="match_parent"
android:layout_height="match_parent"
>
...
<ViewStub
android:id="#+id/viewstub_outername"
android:layout="#layout/viewstub_thatIneed"
android:layout_width="match_parent"
android:layout_height="match_parent"
/>
</RelativeLayout>
contents of the viewstub:
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/viewstub_root"
android:layout_height="match_parent"
android:layout_width="match_parent"
android:background="#android:color/white"
>
<android.support.v7.widget.RecyclerView
android:id="#+id/recyclerview1"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginTop="20dp"
android:visibility="invisible"
/>
<android.support.v7.widget.RecyclerView
android:id="#+id/recyclerview2"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginTop="20dp"
android:visibility="invisible"
/>
</RelativeLayout>
Showing the keyboard thusly:
public static void showSoftKeyboard(Activity activity) {
View view = activity.getCurrentFocus();
InputMethodManager inputManager = (InputMethodManager) activity.getSystemService(Context.INPUT_METHOD_SERVICE);
inputManager.showSoftInput(view, InputMethodManager.SHOW_IMPLICIT);
}

Don't do anything in manifest file. Just use
((LinearLayoutManager)recyclerView.getLayoutManager()).setStackFromEnd(true);
This will take care of recyclerview resizing.

window.decorView.setOnApplyWindowInsetsListener { view, insets ->
val insetsCompat = toWindowInsetsCompat(insets, view)
mainNavigation.isGone = insetsCompat.isVisible(ime())
view.onApplyWindowInsets(insets)
}

Android: ListView tells me it's populated but not displaying items

So I've googled, and scoured SO for an answer to what I think is probably a ridiculous oversight, but here goes.
I have a ListView that I'm populating with an ArrayAdapter that I'm building out of a list of objects I'm using elsewhere in my application. I have checked via getCount that there are items in the adapter, both before and after I call .setAdapter(). Nothing is showing up in my application however.
My main layout res/layout/playlistview:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/playlist_screen"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="1"
android:background="#80000000"
android:gravity="center"
android:orientation="horizontal" >
<ListView
android:id="#+id/playlistview"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:divider="#206"
android:background="#602" >
</ListView>
</LinearLayout>
(I set the colors so I could see what's going on more easily)
the textview for each item res/layout/singlelistitem:
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/single_item"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textSize="16sp"
android:padding="5dp"
android:background="#206">
</TextView>
and the code I use to populate it:
private ListView playlistView;
private void buildPlaylistView() {
playlistView = (ListView)findViewById(R.id.playlistview);
ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, R.layout.singlelistitem, R.id.single_item, playlist.titlesAsArray());
playlistView.setAdapter(adapter);
playlistView.setVisibility(View.VISIBLE);
adapter.notifyDataSetChanged();
((ArrayAdapter<String>)playlistView.getAdapter()).notifyDataSetChanged();
}
playlist.titlesAsArray() does return String[] and it works.
I have both of the .notifyDataSetChanged() in there, since I found that on SO and gave it a try.
When I change the android:layout_height in the ListView object in my XML to wrap_content, I see only the opaque background that is in the LinearLayout that wraps it. When I set the ListView android:layout_height to match_parent, the whole screen is #206 (magentish).
When i check getCount() on the adapter before setAdapter() it says there are items. When I check it after, from the view itself, it says there are the same number of items. I'm totally lost on this one, but nothing is displayed.

Try changing from android:orientation="horizontal" to android:orientation="vertical" this may fix.

Android Listview Horizontal

My xml (lvlayout.xml) layout for a listview is currently like this:
<TextView
android:id="#+id/busnum"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="15dip"
android:gravity="center_horizontal" />
<TextView
android:id="#+id/servdate"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="10dip"
android:textColor="#23cf34" />
I populate the listview via a simplecursor adapter like this:
dueAdapter = new SimpleCursorAdapter(main.this, R.layout.lvlayout,
dueBusesCursor, columnsdue, to);
dueListView = (ListView) findViewById(R.id.ListView01);
dueListView.setAdapter(dueAdapter);
How can I make the listviews horizontal so that the user scrolls sideways ? thanks in advance.

ListView does not support the horizontal mode. The closest thing to a horizontal ListView is Gallery.

you can use ViewPager :
http://developer.android.com/reference/android/support/v4/view/ViewPager.html