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Can't see the design of other xml files except of the activity_main.xml

Here is my code from the file page2.xml
<?xml version="1.0" encoding="utf-8"?>
<androidx.drawerlayout.widget.DrawerLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="#+id/drawer_layout"
android:layout_width="match_parent"
android:layout_height="match_parent">
<!-- Main content view -->
<FrameLayout
android:id="#+id/content_frame"
android:layout_width="match_parent"
android:layout_height="match_parent">
<!-- Hello world text -->
<TextView
android:id="#+id/text_hello_world"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Hello world"
android:textSize="20sp"
android:layout_gravity="center" />
</FrameLayout>
<!-- Side bar menu -->
<com.google.android.material.navigation.NavigationView
android:id="#+id/nav_view"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_gravity="start"
app:menu="#menu/sidebar_menu" />
</androidx.drawerlayout.widget.DrawerLayout>
The code must be correct.
When I am moving from activity_main.xml to page2.xml I can see the design for 1-2 seconds
and then it disappears
How can I fix it?

Why is my comman navigation darwerlayout and content.xml overlapping each other

Question: Why my common navigation drawer layout and content.xml is overlapping each other
I want to implement common navigation drawer for all the multiple activities by using include. I have created a separated XML file for navigation drawer and also include toolbar code inside it.
Navigation.xml
This the navigation part where we include toolbar and drawer code.so here we are implementing simple navigation code by using drawer layout and recycle view
<android.support.v4.widget.DrawerLayout
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/navigation_Drawerlayout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true"
tools:openDrawer="start">
<include
layout="#layout/navigation_drawerlayout" />
<android.support.design.widget.NavigationView
android:id="#+id/navigation_View"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_gravity="start"
android:fitsSystemWindows="true">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<include layout="#layout/navigation_headerview" />
<android.support.v7.widget.RecyclerView
android:visibility="gone"
android:id="#+id/navigationRecycleView"
android:layout_width="match_parent"
android:layout_height="wrap_content"></android.support.v7.widget.RecyclerView>
</LinearLayout>
</android.support.design.widget.NavigationView>
</android.support.v4.widget.DrawerLayout>
Toolbar.xml
this the common toolbar for all the activities.the most uses of it we can easily reuse the code.in which I've simply use CoordinatorLayout and AppBarLayout inside it use toolbar layout with a title.so that I can show toolbar title with a toolbar.
<?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:layout_width="match_parent"
android:layout_height="match_parent">
<android.support.design.widget.AppBarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:theme="#style/ThemeOverlay.AppCompat.ActionBar">
<android.support.v7.widget.Toolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#color/colorPrimary"
android:minHeight="?attr/actionBarSize"
app:titleTextColor="#android:color/white">
<!-- Screen title -->
<TextView
android:id="#+id/toolbarTitle"
style="#style/TextAppearance.AppCompat.Widget.ActionBar.Title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:text=""
android:textColor="#android:color/white"></TextView>
</android.support.v7.widget.Toolbar>
</android.support.design.widget.AppBarLayout>
</android.support.design.widget.CoordinatorLayout>
contents.xml
this the content file where we define my code logic and implementation and also similar to all the activities which use the common navigation drawer
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout
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"
app:layout_behavior="#string/appbar_scrolling_view_behavior"
tools:context=".Activities.EventsActivity"
tools:showIn="#layout/toolbar"
>
<!-- Events -->
<include
layout="#layout/toolbar" />
<android.support.v7.widget.RecyclerView
android:layout_marginTop="55dp"
android:id="#+id/events_recyclerView"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</FrameLayout>

Custom layout with menu in NavigationView?

I need to create a navigation drawer such that, the first menu contains 5 pre-defined items (these will never change). Below that first menu, I want to have a second menu that contains a variable amount of items with a custom layout.
Explained in an image:
Here is what my main activity looks like right now:
<android.support.v4.widget.DrawerLayout
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/drawer_layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true"
tools:openDrawer="start">
<android.support.design.widget.CoordinatorLayout
android:id="#+id/main_content"
android:layout_width="match_parent"
android:layout_height="match_parent">
<android.support.design.widget.AppBarLayout
android:id="#+id/appbar"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<android.support.v7.widget.Toolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
app:layout_scrollFlags="scroll|enterAlways"
app:popupTheme="#style/AppTheme.PopupOverlay" />
<android.support.design.widget.TabLayout
android:id="#+id/tablayout"
android:layout_width="match_parent"
android:layout_height="48dp" />
</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.CoordinatorLayout>
<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">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<include
layout="#layout/nav_header_drawer" />
<ListView
android:id="#+id/drawer_listview"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_gravity="left"
android:choiceMode="singleChoice" />
</LinearLayout>
</android.support.design.widget.NavigationView>
</android.support.v4.widget.DrawerLayout>
Which works, except now I can't use the app:menu="#menu/navigation_drawer_items" property for NavigationView because the ListView items overlap the menu items.
Here is the menu XML:
<menu xmlns:android="http://schemas.android.com/apk/res/android">
<item android:title="Communicate">
<menu>
<item
android:id="#+id/nav_share"
android:icon="#drawable/ic_menu_share"
android:title="Share" />
<item
android:id="#+id/nav_send"
android:icon="#drawable/ic_menu_send"
android:title="Send" />
</menu>
</item>
</menu>
Is there a way that I can load the menu XML AND show a custom layout below the menu? Is there a different want to do this?

NavigationView does not seem to have support for custom footers. In my project I have made this little monster based on some other SO answers.
<android.support.v4.widget.DrawerLayout
android:id="#+id/drawer_layout"
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:background="#color/colorPrimary"
android:fitsSystemWindows="true"
tools:context=".ui.MainActivity">
...screen content...
<android.support.design.widget.NavigationView
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_gravity="start"
android:fitsSystemWindows="true">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_gravity="bottom"
android:orientation="vertical">
<RelativeLayout
android:layout_width="wrap_content"
android:layout_height="0dp"
android:layout_weight="1">
<android.support.design.widget.NavigationView
android:id="#+id/navigation_view"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="top"
app:elevation="0dp"
app:headerLayout="#layout/drawer_header"
app:menu="#menu/drawer">
</android.support.design.widget.NavigationView>
<View
android:layout_width="match_parent"
android:layout_height="21dp"
android:layout_alignParentBottom="true"
android:background="#drawable/bg_navbarscroll"/>
</RelativeLayout>
<include
android:id="#+id/premium_footer"
layout="#layout/drawer_footer"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
</LinearLayout>
</android.support.design.widget.NavigationView>
</android.support.v4.widget.DrawerLayout>
What we have here are two nested NavigationViews. This may be a bit overkill but I wasn't able to make it work otherwise. This is based on the work in this question so all the credit goes there: How to add footer to NavigationView - Android support design library?
The real NavView is the inner one, it has the header, it has the menu, but it doesn't fit system windows. The first one fits system windows and handles the drawer movement. The problem you are facing is because the ListView does not know the size the content in NavView holds. So you need to make sure nothing is in the same layout so there is no overlapping. Your listView has to be in parent of the NavView parent. And because this will likely destroy the mechanism for controls of the DrawerLayout you need the first, outer NavigationView.
Alternatively if you can live without inflating menus in drawer just make a custom "old-fashioned" drawer like the ones before the NavigationViews appeared.

In my case I wanted to add some info text at the bottom of the drawer. After fiddling a bit I managed to obtain the desired result by adding a ConstraintLayout in the NavigationView:
<androidx.drawerlayout.widget.DrawerLayout
android:id="#+id/drawer_layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true">
<include
android:id="#+id/app_bar"
layout="#layout/app_bar_main"
android:layout_width="match_parent"
android:layout_height="match_parent" />
<com.google.android.material.navigation.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/nav_header_main"
app:menu="#menu/activity_main_drawer">
<androidx.constraintlayout.widget.ConstraintLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:id="#+id/bottom_content"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>
</com.google.android.material.navigation.NavigationView>
For now everything seems to be working, but there could be some hidden pitfalls.

A fixed (non-scrolling) footer in your navigation menu, can be achieved by wraping the NavigationView around another layout, like you've posted. you can arrange it, using LinearLayout for the footer items as shown below:
<android.support.design.widget.NavigationView
android:id="#+id/drawer"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_gravity="start"
app:headerLayout="#layout/drawer_header"
app:menu="#menu/drawer">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="bottom"
android:clickable="true"
android:orientation="vertical">
<TextView
android:id="#+id/footer_item_1"
android:layout_width="match_parent"
android:layout_height="48dp"
android:gravity="center"
android:text="Footer Item 1" />
<TextView
android:id="#+id/footer_item_2"
android:layout_width="match_parent"
android:layout_height="48dp"
android:gravity="center"
android:text="Footer Item 2" />
</LinearLayout>
</android.support.design.widget.NavigationView>
You can use whatever you want in place of the TextViews. Structuring your bottom layout well is necessary to avoid overlapping of views.
Menu XML
<menu xmlns:android="http://schemas.android.com/apk/res/android">
<item android:title="Communicate">
<menu>
<item
android:id="#+id/nav_share"
android:icon="#drawable/ic_menu_share"
android:title="Share" />
<item
android:id="#+id/nav_send"
android:icon="#drawable/ic_menu_send"
android:title="Send" />
</menu>
</item>
You can finally add onclick listeners to your layout
View navFooter1 = findViewById(R.id.footer_item_1);
navFooter1.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
// Do footer action
}
});
View navFooter2 = findViewById(R.id.footer_item_2);
navFooter2.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
// Do footer action
}
});

This will help you must set your custom adapter in recyclerView.
<androidx.drawerlayout.widget.DrawerLayout
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/drawer_layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true"
tools:context=".DrawerActivity">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<androidx.appcompat.widget.Toolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="#color/purple_200" />
</LinearLayout>
<com.google.android.material.navigation.NavigationView
android:id="#+id/nav_view"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_gravity="end">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<include layout="#layout/header_layout" />
<androidx.recyclerview.widget.RecyclerView
android:id="#+id/recyclerView"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</LinearLayout>
</com.google.android.material.navigation.NavigationView>
</androidx.drawerlayout.widget.DrawerLayout>

Adding floating action button with drawable layout is not visible in Android

I am developing an Android app. In my app, I am using drawer layout as main layout. There is a Frame Layout inside drawer layout for main content. main content is replaced with Fragment when an item form drawer is clicked. Fragment can contain listview, scroll,gridview or whatever.
What I want is a floating action button fixed at the right bottom of the screen. That must be in the main layout(DrawerLayout) because it will contain for all fragment replaced. I added a floating action button to main layout. But I cannot see it when I run my app.
This is the main layout XML:
<?xml version="1.0" encoding="utf-8"?>
<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/main_drawer_layout"
android:layout_width="match_parent"
android:layout_height="match_parent">
<!-- This LinearLayout represents the contents of the screen -->
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<!-- The ActionBar displayed at the top -->
<include
layout="#layout/action_bar"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
<!-- The main content view where fragments are loaded -->
<FrameLayout
android:background="#color/whitesmoke"
android:id="#+id/main_content"
android:layout_width="match_parent"
android:layout_height="match_parent" />
<android.support.design.widget.FloatingActionButton
android:layout_gravity="bottom|end"
android:id="#+id/fb_office_btn"
android:src="#android:drawable/ic_menu_edit"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
</LinearLayout>
<!-- The navigation drawer that comes from the left -->
<!-- Note that `android:layout_gravity` needs to be set to 'start' -->
<android.support.design.widget.NavigationView
app:itemIconTint="#drawable/drawer_item"
app:itemTextColor="#drawable/drawer_item"
android:id="#+id/left_nv_view"
app:headerLayout="#layout/header_view"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_gravity="start" />
</android.support.v4.widget.DrawerLayout>
This is the screenshot:
As you can see above, there is not floating action button. How can I fix it?
Edit
When I change LinearLayout to RelativeLayout, the gridview of main content are showing like below. Action bar is gone away.

Try to change your LinearLayout to RelativeLayout
<android.support.v4.widget.DrawerLayout
...
>
...
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
>
<!-- The ActionBar displayed at the top -->
<include
android:id="#+id/actionBar" // Add this
layout="#layout/action_bar"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
<!-- The main content view where fragments are loaded -->
<FrameLayout
android:background="#color/whitesmoke"
android:id="#+id/main_content"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_below="#id/actionBar" // Add this
/>
<android.support.design.widget.FloatingActionButton
android:layout_alignParentRight="true" // Add this
android:layout_alignParentBottom="true" // Add this
android:id="#+id/fb_office_btn"
android:src="#android:drawable/ic_menu_edit"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
</RelativeLayout>
...
</android.support.v4.widget.DrawerLayout>
OR you can follow the Android Studio design
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<android.support.v4.widget.DrawerLayout
android:id="#+id/drawer_layout"
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:openDrawer="start">
<include
layout="#layout/app_bar_main" // include app_bar_main
android:layout_width="match_parent"
android:layout_height="match_parent"/>
<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/nav_header_main"
app:menu="#menu/activity_main_drawer"/>
</android.support.v4.widget.DrawerLayout>
app_bar_main.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:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true"
tools:context=".ui.activities.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.AppBarLayout>
<include layout="#layout/content_main"/>
<android.support.design.widget.FloatingActionButton
android:id="#+id/feedback_fab"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="bottom|end"
android:layout_margin="#dimen/fab_margin"
android:src="#drawable/ic_fab_feedback"/>
</android.support.design.widget.CoordinatorLayout>
Change the id of some component like your app.
Hope this help

Navigation drawer with linearlayout implementation which supports all versions of android

i am making an android app i want to implement the navigation drawer like the following i.e
navigation drawer should overlay the actionbar like in playstore,
navigation drawer should be a linear layout (so that i need to add header,listview,footer sort of thing)
it should be same in all versions>Android 4.0
i want to implement like the drawer in following image
https://imgur.com/GhflPDh

Use this layout for your activity
<?xml version="1.0" encoding="utf-8"?>
<android.support.v4.widget.DrawerLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/DrawerLayout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:elevation="7dp">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<include
android:id="#+id/tool_bar"
layout="#layout/tool_bar"></include>
<!-- Your Main Content-->
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_gravity="left"
android:orientation="vertical">
<!-- Your Header-->
<ListView
android:id="#+id/nav_drawer_options_list"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_gravity="left"
android:layout_weight="1"
android:scrollbars="vertical"></ListView>
<!-- Your Footer-->
</LinearLayout>
</android.support.v4.widget.DrawerLayout>
And your toolBar layout, tool_bar.xml
<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.Toolbar
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="?attr/actionBarSize"
android:background="#color/action_bar_color"
app:theme="#style/ThemeOverlay.AppCompat.ActionBar"
android:theme="#style/ThemeOverlay.AppCompat.Dark">
</android.support.v7.widget.Toolbar>