Develop Reference

Change layout template in Android Studio

The old Android Studio used to create the layout files using RelativeLayout, but the new one use ConstraintLayout, and this let me very pissed off >:[ , cause it have to import and sync... I really do not like.
I do not used to use both (RelativeLayout or ConstraintLayout), I prefer LinearLayout vertical, but I did not find how I can change the layout template in order to Android Studio create a layout using LinearLayout vertical, Anyone knows?
I looked for in Preferences -> File and Code Templates however I didn't find where I can change the xml layout template...
Thx

I'm not sure if you can do that, so just replace relative with linear in the xml & don't forget to add to add the orientation

Just delete the content in the layout file, and use the linear layout in that file

Layout as a subset of another layout in android

I built a layout like this in XML say "block.xml"
Now, i want to create an XML like this
so that i can access each block as an array. Can somebody tell me how can i use block.xml as a template to generate my new xml file to be put as a UI part in android. Thank You
Just to be sure , i want to use table layout i dont know how to procees.

In your layout xml you may use the include tag and re-use your block.xml
as:
<include
android:id="#+id/block1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
layout="#layout/block" />
And in your java code you can access views from block.xml as
View firstBlock = findViewById( R.id.block1 );
View blockButton = firstBlock.findViewById( R.id.someButtonId );

You should inflate and add the sub layouts programmatically.
This link has example code:
Android using layouts as a template for creating multiple layout instances

Ad xmlns attributes in java

I am currently converting an xml file to java coding, but I have met a problem. In my xml file I have a View with two xmlns attributes like this :
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:launcher="http://schemas.android.com/apk/res/com.android.launcher"
How can I ad these to my custom FrameLayout in java?

The purpose of the xmlns attributes is to tell the design-time and build-time tools about the various UI elements such as Button, TextView, FrameLayout etc.
Simply importing the relevant widget and view classes if you're writing Java code to build the layout dynamically is basically the equivalent. In other words, don't worry about the xmlns attributes.

How to see the Graphical Layout of an XML file in a folder within /res/layout?

I can see the Graphical Layout of the XML file within the /res/layout folder, but not the ones inside my /res/layout/signup folder. Does this mean I can only create XML layout files inside /res/layout? The other tab when I open the XML files in /res/layout/signup is "Structure," not "Graphical Layout." I'm using Eclipse, by the way.
Update: I tried moving the files from /res/layout/signup to /res/layout and now I can see their graphical layouts. So is this really a problem with the folders?

unfortunately /res/layout doesn't support child folders.
I'm pretty sure it's because R manages it's references as a List, and as such all layouts must be on the same "level".
Try appending what would be the folder as a prefix to the layout name--
signup_editform.xml
signup_tips.xml
...

How do I used values declared in XML on my custom layout?

Im creating a custom layout and I want to use the text declared in the layout.xml file in my layout.
Like when I create a TextView in XML and set android:text=#string/text1 when I run the app text view automatically loads the text from android:text. So how can I access attributes declared in the layout XML file in my custom component.

I have learn how to do it from this:
WebImageView: Buy one, get two!
In simple steps:
Define the string of your XMLS.
Get the attributes in the code.

Did you complete the Android Developer Tutorials? The Hello, Views | Relative Layout tutorial will walk you through how to do this.