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Android: floating button doesn't appear in the app, however is visible in preview

I want to add a floating button above the webview that will be used to close the webview and return to the previous fragment. Below is my code. The problem is that floating button never appears. I can see it in the preview, however when I run the app button never appears. As described here I put webview and button inside of a RalativeLayout but for some reason my button does not appear.
Preview in Android Studio
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 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:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
tools:context=".WebViewFragment">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<WebView android:id="#+id/webview"
android:layout_centerHorizontal="true"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="false" />
<com.google.android.material.floatingactionbutton.FloatingActionButton
android:id="#+id/exitWebview"
android:layout_width="60sp"
android:layout_height="60sp"
android:layout_alignParentRight="true"
android:layout_marginStart="118sp"
android:layout_marginTop="118sp"
android:layout_marginEnd="118sp"
android:layout_marginBottom="118sp"
android:clickable="true"
android:layout_alignParentTop="true"
android:contentDescription="#string/button_hint_start_new_chat"
android:focusable="true"
app:backgroundTint="#color/button_background"
app:borderWidth="0dp"
app:srcCompat="#drawable/ic_chat_white"
app:tint="#ffffff" />
<ProgressBar
android:id="#+id/webViewPbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:indeterminate="true"
android:layout_margin="20dp"
android:indeterminateTint="#color/colorPositiveAction"
android:indeterminateTintMode="src_atop" />
</RelativeLayout>
</androidx.constraintlayout.widget.ConstraintLayout>

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>

Analog Clock does not appear in the application

I'm trying to set a analog clock for my app but both the analog clock and the digital clock just dont appear when i run the app on my device, but if i look at the graphic view of the layout its there!
Heres my code:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:weightSum="100" >
<ScrollView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="30" >
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
//Some Text Views and Edit Texts here!
</LinearLayout>
</ScrollView>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="fill_parent"
android:orientation="vertical"
android:layout_weight="20" >
<Space
android:layout_width="match_parent"
android:layout_height="2dp" />
<Button
android:text="Send"
android:id="#+id/bSendEmail"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="center" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="fill_parent"
android:orientation="vertical"
android:layout_weight="50" >
<Space
android:layout_width="match_parent"
android:layout_height="2dp" />
<AnalogClock
android:id="#+id/acClock"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:visibility="visible" />
</LinearLayout>
</LinearLayout>

My guess is that your layout is not scaling well to varied resolutions. Click the Preview All Screens option (in in the Graphical Layout section of Eclipse) to see if you can see the same cropping problem there. If so, you'll need to experiment with different layout weights, etc. to ensure that the layout works well across different device resolutions.

I guess problem can be about ScrollView. Try to change it and let me know result. Because I don't know for which reason its happening but sometimes with ScrollView view is getting hidden...

Android splash screen not appearing correctly

When the app is loading, instead of a proper splash screen it just shows, the best way to describe it, when you go to install an app from the Play store, the black screen with the icon in the top left corner and some text, that's all it shows when launching my app...
I narrowed it down to activity_game.xml as when looking in the Graphical Layout of that file, it just shows a boring black screen with text.
How would I change this to incorporate a full screen image on splash instead?
Let's say for example, the image is called 'loading.png'
Content of activity_game.xml is below;
<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"
android:paddingBottom="#dimen/activity_vertical_margin"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
tools:context=".GameActivity" >
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/hello_world" />
</RelativeLayout>
--- Edit -
Thanks Rod, works to the point I now get a black screen on launch, I copied loading.png into the drawable folder and use the code like this;
<?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"
tools:context=".GameActivity" >
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="#drawable/loading"
android:adjustViewBounds="true"
android:scaleType="fitXY" />
</RelativeLayout>
Not sure why it is not loading the image?

First you need to make your activity full screen by setting the theme to no title bar into your activity tag of the manifest and add this:
android:theme="#android:style/Theme.NoTitleBar.Fullscreen"
Dont add padding to the RelativeLayout to avoid the black screen border, instead of TextView use the ImageView to create an image to the layout.
sample:
<?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"
tools:context=".GameActivity" >
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="your_drawable_image"
android:adjustViewBounds="true"
android:scaleType="fitXY" />
</RelativeLayout>

How to change a default Horizontal ProgressBar to vertical?

So far i have a working horizontal progress bar.
This is my xml file
<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" >
<ProgressBar
android:id="#+id/progressBar1"
style="?android:attr/progressBarStyleHorizontal"
android:layout_width="200dp"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:layout_marginTop="168dp" />
I'm going to use it as a visual indicator of a liquid tank.(Progress as level)
I want to know how to set it vertcal. If it is not possible can some one suggest some other option to my problem.