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Bottom Navigation Bar not shown in activity

I have an activity with a title, a fragment with a recyclerview full of cards and a bottom navigaton bar.
I cannot manage to show all 3 together without problems, the closest I have been is showing all 3, but with the bar taking space from the cards space.
Right now this is the XML which I thought should be working:
<LinearLayout 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:orientation="vertical"
tools:context=".habits.HabitsActivity">
<ImageView
android:id="#+id/imageView"
android:layout_width="313dp"
android:layout_height="166dp"
android:layout_gravity="center_horizontal"
app:srcCompat="#drawable/goodreasons" />
<android.support.design.widget.CoordinatorLayout
android:id="#+id/coordinatorLayout"
android:layout_width="match_parent"
android:layout_height="match_parent">
<FrameLayout
android:id="#+id/contentFrame"
android:layout_width="match_parent"
android:layout_height="match_parent"></FrameLayout>
</android.support.design.widget.CoordinatorLayout>
<FrameLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_gravity="bottom">
<com.aurelhubert.ahbottomnavigation.AHBottomNavigation
android:id="#+id/bottom_navigation"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="bottom" />
</FrameLayout>
</LinearLayout>
But this gives this output:
This is the xml of the fragment, in case you think it is relevant too.
<?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"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_gravity="center"
android:orientation="vertical"
android:padding="5dp"
>
<android.support.v7.widget.RecyclerView
android:id="#+id/rv_list"
android:layout_width="wrap_content"
android:layout_height="match_parent"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.0"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.0"
android:layout_gravity="center"
/>
</LinearLayout>

Here's your layout, stripped down:
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<ImageView
android:layout_width="313dp"
android:layout_height="166dp"/>
<android.support.design.widget.CoordinatorLayout
android:layout_width="match_parent"
android:layout_height="match_parent"/>
<FrameLayout
android:layout_width="match_parent"
android:layout_height="match_parent"/>
</LinearLayout>
Your problem is that the CoordinatorLayout has a match_parent height, so it will take up all of the space that the ImageView doesn't. That leaves no space at all for the FrameLayout, so you won't be able to see anything inside of it.
Probably the best thing to do would be to use layout_weight on the CoordinatorLayout to make it take up as much space as it can while still leaving room for other views. That would look something like this:
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<ImageView
android:layout_width="313dp"
android:layout_height="166dp"/>
<android.support.design.widget.CoordinatorLayout
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1"/>
<FrameLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
</LinearLayout>
The only changes I made were to set the CoordinatorLayout's height to 0dp and the FrameLayout's height to wrap_content, and to add the weight attribute to the CoordinatorLayout.

Android layout collapse

I use a XWalkView to load webpage and a IjkVideoView to play live video in my app. I want the IjkVideoView playing the video in front the XwalkView, so I put these two view in a relativelayout and IijVideoView behind the XWalkView.
In the android studio's Component Tree of Design window the layout seems ok as below image,
While when I run the app in my device, the layout is in mess as below image. You can see the background of IjkVieoView is in front of XWalkView, but the video playing in the IjkVideoView is behind the XWalkView, as the upper part of the video has been covered by the XWalkView.
layout xml,
<?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"
xmlns:tools="http://schemas.android.com/tools"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:ignore="UselessParent">
<!-- This could be your fragment container, or something -->
<org.xwalk.core.XWalkView xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/xWalkView"
android:layout_width="fill_parent"
android:layout_height="160dp"
android:background="#color/blue"
android:isScrollContainer="true">
</org.xwalk.core.XWalkView>
<com.xxxxxx.app.widget.media.IjkVideoView
android:id="#+id/video_view"
android:layout_width="200dp"
android:layout_height="200dp"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:layout_marginTop="72dp"
android:background="#color/colorAccent" />
<com.roughike.bottombar.BottomBar
android:id="#+id/bottomBar"
android:layout_width="match_parent"
android:layout_height="60dp"
android:layout_alignParentBottom="true"
app:bb_tabXmlResource="#xml/web_tabs" />
</RelativeLayout>
</LinearLayout>
activity java code,
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Log.d("INFO", "entered");
setContentView(R.layout.activity_web);
mXWalkView = (XWalkView) findViewById(R.id.xWalkView);
XWalkSettings webSettings = mXWalkView.getSettings();
webSettings.setJavaScriptEnabled(true);
mXWalkView.addJavascriptInterface(new JsInterface(), "NativeInterface");
videoView = (IjkVideoView) findViewById(R.id.video_view);
videoView.setAspectRatio(IRenderView.AR_ASPECT_FILL_PARENT);
videoView.setVideoURI(Uri.parse("http://live.xxxxxx.com/live/40xx27.flv"));
videoView.start();
final Bundle extras = getIntent().getExtras();
mXWalkView.load("http://xxxxxxxxxxxxxx", null);
}

Your layout seems to be correct. It might be broken from the libs. It already has 1k+ issues.
Maybe you can use a custom dialog that has the video in it and show that dialog. This way the video will be in front of the images. Then you can try to remove the shadow or bgColor = transparent, so that the user might not realise that is a dialog. This hack may work.

<?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"
xmlns:tools="http://schemas.android.com/tools"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:ignore="UselessParent">
<!-- This could be your fragment container, or something -->
<org.xwalk.core.XWalkView xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/xWalkView"
android:layout_width="fill_parent"
android:layout_height="160dp"
android:background="#color/blue"
android:elevation="5dp"
android:isScrollContainer="true">
</org.xwalk.core.XWalkView>
<com.xxxxxx.app.widget.media.IjkVideoView
android:id="#+id/video_view"
android:layout_width="200dp"
android:layout_height="200dp"
android:elevation="10dp"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:layout_marginTop="72dp"
android:background="#color/colorAccent" />
<com.roughike.bottombar.BottomBar
android:id="#+id/bottomBar"
android:layout_width="match_parent"
android:layout_height="60dp"
android:elevation="5dp"
android:layout_alignParentBottom="true"
app:bb_tabXmlResource="#xml/web_tabs" />
</RelativeLayout>
</LinearLayout>
Try this layout i modify it with elevation may it will help you.I have same problem by using elevation it solve.

I think it is due to relative layout. Why don't you try this code by using the Frame Layout. The most convenient and maintainable way to design application user interfaces is by creating XML layout resources. This method greatly simplifies the User Interface design process, moving much of the static creation and layout of user interface controls and definition of control attributes, to the XML, instead of littering the 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"
xmlns:tools="http://schemas.android.com/tools"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">
<FrameLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content" >
<org.xwalk.core.XWalkView
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/xWalkView"
android:layout_width="fill_parent"
android:layout_height="160dp"
android:background="#color/blue"
android:isScrollContainer="true">
</org.xwalk.core.XWalkView>
<com.xxxxxx.app.widget.media.IjkVideoView
android:id="#+id/video_view"
android:layout_width="200dp"
android:layout_height="200dp"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:layout_marginTop="72dp"
android:layout_gravity="Bottom"
android:gravity="center"
android:background="#color/colorAccent" />
<com.roughike.bottombar.BottomBar
android:id="#+id/bottomBar"
android:layout_width="match_parent"
android:layout_height="60dp"
android:layout_alignParentBottom="true"
app:bb_tabXmlResource="#xml/web_tabs" />
</FrameLayout>
</LinearLayout>

how to add a box over card view on selection?

I have a list of hours created with card view and recycler view. I want to show the changes on some selection of hours. on selection I want to show type of blue box in image. How can I achieve it??
I think I need to add multiple layouts in the parent layout and change the background color of the layouts. Is it a right way?? Or is it possible with any other way???
card layout
<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:card_view="http://schemas.android.com/apk/res-auto"
android:id="#+id/card_view"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#android:color/holo_blue_light">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="60dp"
android:id="#+id/relativeLayout"
android:layout_alignParentTop="true">
<ImageView
android:layout_width="280dp"
android:layout_height="2dp"
android:id="#+id/imageView"
android:background="#drawable/lineh"
android:layout_marginRight="20dp"
android:layout_centerVertical="true"
android:layout_alignParentEnd="true" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceSmall"
android:text="Small Text"
android:id="#+id/txthour"
android:layout_marginLeft="10dp"
android:layout_centerVertical="true"
/>
</RelativeLayout>
</android.support.v7.widget.CardView>
Main Layout
<android.support.v4.widget.DrawerLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="#+id/nav_drawer"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:id = "#+id/toolbar_container">
<android.support.v7.widget.Toolbar xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="?attr/colorPrimary"/>
<FrameLayout
android:id="#+id/nav_contentframe"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#android:color/background_light"
android:layout_below="#+id/toolbar">
</FrameLayout>
</LinearLayout>
<android.support.design.widget.NavigationView
android:id="#+id/nav_view"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_gravity="start"
android:fitsSystemWindows="true"
app:headerLayout="#layout/drawer_header"
app:menu="#menu/nav_menu"
android:background="#android:color/background_light" />
</android.support.v4.widget.DrawerLayout>
Fragment Layout
<FrameLayout 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="com.example.siddhi.timetablelayout.List"
android:background="#android:color/holo_blue_bright">
<android.support.v7.widget.RecyclerView
android:layout_height="match_parent"
android:layout_width="match_parent"
android:id="#+id/RecyclerView"
android:background="#android:color/white"
android:layout_weight="1.40"
android:layout_gravity="right|bottom" />
</FrameLayout>
Please help...

I would recommend you to use a custom view(or layout that is, obviously, also a view) for this purpose. What you need to do is override onDraw method:
#Override
public void onDraw(Canvas canvas){
super.onDraw(canvas);
drawOverlay(canvas);
}
In this case you need to setup all overlay params for your view and after that just draw on canvas a selection. Here is a good article about it.

Drop shadow on fragments with a listview and scrollview

I'm having an issue with a ListView and a ScrollView and adding a drop shadow between the listview and the ScrollView.
I had made a shape, which works great with a ListView and a relative layout, but does not work with the ScrollView.
I have done the following - Dashboard List
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingLeft="8dp"
android:paddingRight="8dp">
<ListView
android:id="#id/android:list"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="1"
android:choiceMode = "singleChoice"
android:listSelector="#31ABD4"
android:drawSelectorOnTop="false"/>
<TextView android:id="#id/android:empty"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:text="No data"/>
</RelativeLayout>
Dashboard with scroll view
<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="fill_parent"
android:layout_height="fill_parent" >
<RelativeLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="#color/white" >
<View
android:layout_width="10dp"
android:layout_height="fill_parent"
android:background="#drawable/shadow_left" />
</RelativeLayout>
</ScrollView>
View
<?xml version ="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android">
<gradient
android:angle="180"
android:width="10dp"
android:centerX="0.1"
android:gravity="right"
android:startColor="#00000000"
android:endColor="#55000000"
android:type = "linear"
/>
</shape>
Edit - Attached Screenshots
Thank you all,
James

seems that you are missing the paddings on "Dashboard with scroll view"
try this instead
<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:paddingLeft="8dp"
android:paddingRight="8dp" >
<RelativeLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="#color/white" >
<View
android:layout_width="10dp"
android:layout_height="fill_parent"
android:background="#drawable/shadow_left" />
</RelativeLayout>
</ScrollView>

How to make the GridView center of the device?

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="horizontal"
android:background="#FFFFFF"
android:layout_gravity="center"
android:padding="5dip" >
<GridView
android:id="#+id/homeGridView"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:columnWidth="200dip"
android:adjustViewBounds="true"
android:layout_gravity="center"
android:gravity="center"
android:horizontalSpacing="0dip"
android:numColumns="2"
android:stretchMode="none"
android:verticalSpacing="#dimen/grid_vertical_space" />
</LinearLayout>
How to make the GridView center of the device?

Use Relative Layout instead of Linear Layout and apply android:layout_centerInParent="true" in your Gird View

Did you tried to set your Gridview's android:layout_width and android:layout_height to wrap_content?