Develop Reference

Android: how to use layouts from imported module in design mode [duplicate]

How to include layout inside layout in Android?
I am creating common layout. I want to include that layout in another page.

Edit: As in a comment rightly requested here some more information. Use the include tag
<include
android:layout_width="match_parent"
android:layout_height="wrap_content"
layout="#layout/yourlayout" />
to include the layout you want to reuse.
Check this link out...

Note that if you include android:id... into the <include /> tag, it will override whatever id was defined inside the included layout. For example:
<include
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:id="#+id/some_id_if_needed"
layout="#layout/yourlayout" />
yourlayout.xml:
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:id="#+id/some_other_id">
<Button
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:id="#+id/button1" />
</LinearLayout>
Then you would reference this included layout in code as follows:
View includedLayout = findViewById(R.id.some_id_if_needed);
Button insideTheIncludedLayout = (Button)includedLayout.findViewById(R.id.button1);

Use <include /> tag.
<include
android:id="#+id/some_id_if_needed"
layout="#layout/some_layout"/>
Also, read Creating Reusable UI Components and Merging Layouts articles.

Try this
<include
android:id="#+id/OnlineOffline"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
layout="#layout/YourLayoutName" />

From Official documents about Re-using Layouts
Although Android offers a variety of widgets to provide small and
re-usable interactive elements, you might also need to re-use larger
components that require a special layout. To efficiently re-use
complete layouts, you can use the tag to embed another
layout inside the current layout.
Here is my header.xml file which i can reuse using include tag
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="#FFFFFF"
>
<TextView
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
android:gravity="center"
android:text="#string/app_name"
android:textColor="#000000" />
</RelativeLayout>
No I use the tag in XML to add another layout from another XML file.
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="#f0f0f0" >
<include
android:id="#+id/header_VIEW"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
layout="#layout/header" />
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_margin="5dp"
android:background="#ffffff"
android:orientation="vertical"
android:padding="5dp" >
</LinearLayout>

Learn More Using this link
https://developer.android.com/training/improving-layouts/reusing-layouts.html
<androidx.constraintlayout.widget.ConstraintLayout 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"
tools:context=".Game_logic">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="5dp"
android:id="#+id/text1"
android:textStyle="bold"
tools:text="Player " />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textStyle="bold"
android:layout_marginLeft="20dp"
android:id="#+id/text2"
tools:text="Player 2" />
</LinearLayout>
</androidx.constraintlayout.widget.ConstraintLayout>
Blockquote
Above layout you can used in other activity using
<?xml version="1.0" encoding="utf-8"?><androidx.constraintlayout.widget.ConstraintLayout 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"
tools:context=".SinglePlayer">
<include layout="#layout/activity_game_logic"/>
</androidx.constraintlayout.widget.ConstraintLayout>

Do I need to embed a LinearLayout into another for inclusion into a ListView?

In order to create an XML resource file to be included via tools:listitem="#layout/row", I was told to create an XML structure like so:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">
<LinearLayout
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="50dp"
android:id="#+id/reminder_row">
<android.support.v4.widget.Space
android:layout_width="50dp"
android:layout_height="match_parent"
android:id="#+id/view"/>
<TextView
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:textAppearance="?android:attr/textAppearanceLarge"
android:text="Large Text"
android:id="#+id/textView"/>
</LinearLayout>
</LinearLayout>
Now... is it important to have the second LinearLayout nested into the first one? Are there good reasons why I can't do this instead?
<?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="50dp">
<android.support.v4.widget.Space
android:layout_width="50dp"
android:layout_height="match_parent"
android:id="#+id/view"/>
<TextView
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:textAppearance="?android:attr/textAppearanceLarge"
android:text="Large Text"
android:id="#+id/textView"/>
</LinearLayout>

I'm wondering you are told by whom to do the first xml? The second one should totally work. Just don't forget to include the orientation.
And tools:xxx is just for IDE preview purposes, it doesn't really matter.

Android: How do I access my main layout with an id (which i had provided in xml) in my class?

I basically want to access my layout so that I can move onto the next screen when the user clicks anywhere on the present screen.
this is my xml code.
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:minWidth="25px"
android:minHeight="25px"
android:id="#+id/hellolayout">
<TextView
android:text="WELCOME!"
android:textSize="50dp"
android:gravity="center"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="0.9"
android:id="#+id/textView1"
android:layout_centerHorizontal="true" />
<ImageView
android:src="#drawable/idiotic_smile"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="0.1"
android:id="#+id/imageView1" />
</LinearLayout>
In the class, 'hellolayout' is not recognized. Is there anything I'm missing to include?
LinearLayout l = FindViewById<LinearLayout> (Resource.Id.hellolayout);

Acessing a layout should be as simple as R.layout.YourLayoutName. To load it use setContentView(R.layout.YourLayoutName).
Better refer to the docs here.

how to insert layout to layout in android?

I've got two layouts first and second, I want to insert second to first.
I want to insert second layout into layout that has id #+id/layout
when I press button Get Layout, it show the the second layout on the bottom of button
first layout
<LinearLayout 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:orientation="vertical" >
<Button
android:id="#+id/btn_get_layout"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Get Layout" />
<LinearLayout
android:id="#+id/layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
</LinearLayout>
</LinearLayout>
second layout
<?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:background="#drawable/card_base"
android:orientation="vertical" >
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent" >
<ImageView
android:id="#+id/img_cover"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:layout_margin="10dp"
android:scaleType="fitXY"
android:src="#drawable/card_beauty" />
<ImageView
android:id="#+id/img_photo"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:layout_margin="20dp"
android:scaleType="fitXY"
android:src="#drawable/sample_0" />
</RelativeLayout>
</LinearLayout>

if I understood you right you should use the following code within your first layout
<include
layout="#layout/second_layout"
android:id="#+id/includedLayout"
android:visibility="gone"
android:layout_below="#id/buttonId" />
and then in your button's action you just use
((RelativeLayout)findViewById(R.id.includedLayout)).setVisibility(View.VISIBLE);

LinearLayout placeHolder = (LinearLayout) findViewByid(R.id.layout);
getLayoutInflater().inflate(R.layout.second_layout, placeHolder);

Use include
Here is a somewhat fuller example. The square blue layout is inserted into the main layout using include.
activity_main.xml
This is the main layout. The custom layout is referenced using include. You can override any of the attributes here, too.
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:padding="16dp">
<!-- Here is the inserted layout -->
<include layout="#layout/my_layout"/>
</RelativeLayout>
my_layout.xml
This is the custom layout that will be inserted into the main layout.
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="100dp"
android:layout_height="100dp"
android:background="#color/colorPrimary">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:padding="5dp"
android:text="My Layout"/>
</RelativeLayout>

You Should use this code snippet to add a Layout inside another one.
parentLayout=(LinearLayout)findViewById(R.id.parentLayout);
inflateView=View.inflate(this,R.layout.view_video,parentLayout);
Here the parentLayoutis the root View and R.layout.view_video is the layout that you need to insert.

Use LayoutInflator to inflate an external layout into existing layout. Checkout LayoutInflater on Android Dev Site for more information about it.

Include XML Layout

I have the following working xml layout for a ListView
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:id="#+id/text01"/>
<RelativeLayout
android:id="#+id/rel01"
android:layout_width="wrap_content"
android:layout_height="wrap_content">
<ImageView
android:id="#+id/widget01"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="#drawable/logo"
/>
<ImageButton
android:id="#+id/widget02"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_toRightOf="#+id/widget01"
android:src="#drawable/refresh"
/>
</RelativeLayout>
<ListView
android:id="#+id/android:list"
android:layout_width="fill_parent"
android:layout_height="wrap_content"/>
<TextView
android:id="#+id/android:empty"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textColor="#ffffff"
/>
</LinearLayout>
I want to move text01 and all RelativeLayout in another file (it is the header for all my activities) and include it in this xml. I am trying but I am not able to do this, can sameone help me?

You should put the things you want to reuse into extra files. Then you can use the parts like:
<!-- my_header.xml -->
<?xml version="1.0" encoding="UTF-8"?>
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:id="#+id/text01"/>
In another file include it with:
<include layout="#layout/my_header" />
<!-- your other stuff -->

First : create a new file layout xml : header.xml ; which will contain the TextView and all the RelativeLayout
Second : you can include it where ever you want with the following code :
<include android:id="#+id/myHeader"
layout="#layout/header" />