TextView height does not match_parent / fill_parent - android

I have a simple TextView with a singleLine.
I would like to set the height to match_parent/fill_parent, but the behaviour of Android is to only to wrap_content.
Is there a way to force that the TextView takes all height ?
Tkx
Edit :
This is what I get :
and my layout :
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:id="#+id/date"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:gravity="center"
android:paddingLeft="13dp"
android:paddingRight="3dp"
android:textColor="#android:color/white"
android:textStyle="bold" />
[...]
</RelativeLayout>


You can set the TextView height to match_parent/fill_parent. And change the gravity and all other property of that TextView according to your requirement.
If this is not suffiecient for you then let me know what exactly you want to do.
EDIT:
As per your new edited code i worked on your code.
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_height="match_parent"
android:layout_width="match_parent">
<TextView android:id="#+id/date"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:gravity="center"
android:paddingLeft="13dp"
android:paddingRight="3dp"
android:textStyle="bold"
android:textColor="#ffffff"
android:text="dateText"/>
</RelativeLayout>
Now its showing the TextView at the central_vertical position of the whole screen.
Try this code. Its working. Change your RelativeLayout and TextView as i did with these.


For that TextView parent width, you may use wrap_content.

Related

RelativeLayout View to right of TextView

I got following simple Layout. The problem can be reproduced in the android studio designer:
<?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">
<TextView
android:id="#+id/x"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerVertical="true"
android:layout_marginEnd="#dimen/margin_small"
android:layout_marginRight="#dimen/margin_small"
android:text="#string/long_string"
android:textAppearance="?android:attr/textAppearanceSmall"/>
<CheckBox
android:id="#+id/y"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_toRightOf="#+id/x"
android:layout_toEndOf="#+id/x"
android:layout_centerVertical="true" />
</RelativeLayout>
This layout works fine if the text length of the textview is short. The checkbox is placed on the right of the textview. But if the text gets long and even wraps maybe, then the checkbox is pushed out of the view. It is not visible anymore. I would like that the checkbox is always visible on the right of the textview even, if it fills the whole width of the screen.
I tried to rewrite the layout with a LinearLayout which doesn't work either.
<?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="horizontal">
<TextView
android:id="#+id/x"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginEnd="#dimen/margin_small"
android:layout_marginRight="#dimen/margin_small"
android:text="#string/long_string"
android:textAppearance="?android:attr/textAppearanceSmall"/>
<CheckBox
android:id="#+id/y"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
/>
</LinearLayout>
Do you know a trick to to achieve this with relative layout? I would somehow expect this behaviour from relative layout by default. Thanks ;)

This is working for me: make checkBox alignParentRight and make TextView toLeftOf it:
<?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">
<TextView
android:id="#+id/x"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerVertical="true"
android:layout_toLeftOf="#+id/y"
android:text="This is very-very-very looooooooooooong stringgggg, very-very, long-long"
android:textAppearance="?android:attr/textAppearanceSmall"/>
<CheckBox
android:id="#+id/y"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerVertical="true"
android:layout_alignParentRight="true"/>
</RelativeLayout>
Edit. You can include this Relative Layout into other (parent) layout:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">
<RelativeLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerVertical="true"
android:gravity="left">
<TextView
android:id="#+id/x"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerVertical="true"
android:layout_toLeftOf="#+id/y"
android:text="this is veryyyyy yyyyyyyyyy yyyyyy yyy loooooo oooooooo ooon nnggggg gggg striiii iiiiin gggggg ggggg ggggggg ggg"
android:textAppearance="?android:attr/textAppearanceSmall"/>
<CheckBox
android:id="#+id/y"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_alignParentEnd="true"
android:layout_centerVertical="true" />
</RelativeLayout>
</RelativeLayout>
It's also working. If you put android:gravity="left" into Relative layout, it will locate its content on the left side.

One way out would be to put the textview and checkbox in a linear layout with orientation horizontal. Set width of checkbox to be whatever you want (a constant) and the width of textbox to be 0dp and layout_weight of 1.

You should put the property layout_weight to make your views (TextView and Checkbox) have a deff space in the screen instead of use a hard value
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal">
<TextView
android:id="#+id/x"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="0.9"
android:layout_marginEnd="#dimen/margin_small"
android:layout_marginRight="#dimen/margin_small"
android:text="#string/long_string"
android:textAppearance="?android:attr/textAppearanceSmall"/>
<CheckBox
android:id="#+id/y"
android:layout_weight="0.1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
/>
</LinearLayout>

I guess the desired layout is not possible by default. I tried to do this using RelativeLayout, LinearLayout and TableLayout. It is technically understandable that the these layout do not support that behaviour. The relative layout would have to explicitly respect the case that an element on the left or right is minimal visible inside the parent even it is placed to left or right. Another solution would be if the table layout would allow a column to consume the rest of the space but respects min width of other columns as well.
For my case i wrote a workaround. I used the initial relative layout of my question but set a max width to the textview using following calculation:
DisplayMetrics displaymetrics = new DisplayMetrics();
context.getWindowManager().getDefaultDisplay().getMetrics(displaymetrics);
int displayWidth = displaymetrics.widthPixels;
That guarantees the checkbox to be visible. I know the solution could be hardly possible in scenarios where the given layout is embedded in a more complex layout.

Textview is not truncating the text

Following is my .xml file
<?xml version="1.0" encoding="utf-8"?>
<TableRow xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/tableRow1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_vertical"
android:gravity="center_vertical" >
...
<TextView
android:id="#+id/tvAlternateRoad"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginRight="#dimen/fancy_dashboard_max_speed_circle_strock_size"
android:gravity="start"
android:text="Via A11"
android:lines="1"
android:textColor="#808080"
android:textSize="#dimen/fancy_dashboard_lable_size" />
</TableRow>
I am calling the above .xml file in my main view .xml as following,
<RelativeLayout
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="0.85"
android:gravity="end"
android:orientation="horizontal" >
<TableLayout
android:id="#+id/layAlternateRoute"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_margin="#dimen/fancy_dashboard_max_speed_circle_strock_size"
android:background="#drawable/bg_round_rect_alternate_route" />
</RelativeLayout>
http://i.stack.imgur.com/a0KRs.png
I am displaying a view on the screen which has above TableRow element. I am setting this Textview tvAlternateRoad's text value at run time. Sometimes when Text is large then it is moving outside the view. I tried to truncate it using android:ellipsize="end" from some S.O. posts but it seems it is not working now a days.
Can somebody help me on this?

Give paddingRight to text view. Also, text view has width wrap content and no relation with any other view. So your text view width can exceed the rounded corner background image as per text length. So either give some maxWidth value or relate it to some other views.
Edit
I just made this xml:
<?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" >
<TextView
android:id="#+id/textview_Statu"
style="#style/text_view_login_style"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="#dimen/more_txt3_margin_t"
android:background="#android:color/white"
android:ellipsize="end"
android:singleLine="true"
android:text="1234567890qwertyuiopasdfghjklzxcvbnm"
android:textColor="#color/blue_end" />
</LinearLayout>
In graphical view, It looks like this
Its working fine.

I have noticed that TextView will do different things with respect to wrapping and truncating depending on the container it's in. Try having the TableRow cell be, for instance, a FrameLayout. Then put your TextView inside the FrameLayout and see what happens.

Just use:
android:singleLine="true" and android:ellipsize="end"
and set a fixed width for your textview like "match_parent" or something in dp like "180dp" etc.
singleLine="true" needs your textview to have a fixed width which is not provided by "wrap_content".
A textview will only show ellipses at the end of its view's bounds and since you have set "wrap_content" your textview does not have any fixed bounds.

try this
tablelayout should be
<TableLayout
android:id="#+id/tbl"
android:layout_height="wrap_content"
android:layout_width="match_parent"
>
the remaining part should be
<TableRow
android:layout_height="wrap_content"
android:layout_width="match_parent"
>
<TextView
android:id="#+id/tvAlternateRoad"
android:layout_height="wrap_content"
android:layout_width="match_parent"
android:ellipsize="end"
android:maxLines="1"
android:minLines="1"
android:layout_marginRight="#dimen/fancy_dashboard_max_speed_circle_strock_size"
android:gravity="start"
android:text="Via A11"
android:layout_weight="1"
android:textColor="#808080"
android:textSize="#dimen/fancy_dashboard_lable_size" />

Ok, after long effort I have solve the issue my self.
Logic:
fetch the screen size programmatically
int screen_width = context.getResources().getDisplayMetrics().widthPixels;
then I used 42% of the screen_width as maxwidth of textView
((TextView)alternate.findViewById(R.id.tvAlternateRoad)).setMaxWidth((int)(screen_width*0.42));
I have also set below values in xml
android:ellipsize="marquee"
android:maxLines="1"

TextView not properly in the center

i want to place a textview in the center of a linearlayout but i am having problems with it. my linearlayout is match_parent in layout_width. textview is centered by assigning center to layout_gravity. textview is wrap_content in layout_width. here is my xml file
<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:background="#drawable/background"
android:orientation="vertical" >
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content" >
<TextView
android:id="#+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:text=" Text"
android:textSize="40sp"
android:textStyle="bold"
android:typeface="monospace" />
</LinearLayout>
</LinearLayout>

Two things:
1) set
android:gravity="center"
android:layout_gravity="center"
in your textview;
2) The second linearlayout (inside) is useless. Just remove it. What's more, if you only have one view, consider using FrameLayout instead of LinearLayout, then use <merge> tag to optimize the performance (see details here)

if you want to center the text inside your TextView you have to use android:gravity="center"

Change
android:layout_gravity="center" to
android:gravity="center"

Set these properties in the second Linearlayout.
android:gravity="center"
android:layout_gravity="center"

to make your textview center set
android:gravity="center"
android:layout_gravity="center"
of your textview.
see the difference here:-
android:gravity :-- sets the gravity of the content of the View its used on.
android:layout_gravity:-- sets the gravity of the View or Layout in its parent.

layout_toRightOf works and layout_toLeftOf doesn't, how to solve?

I have simple relative layout - an ImageView (iv1) and a TextView (tv1) to the left of iv1. Unfortunately, I see no tv1. What is more, even hierarchyViewer can't help me find it.
<?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="wrap_content"
android:gravity="right"
android:background="#android:color/white"
>
<ImageView
android:id="#+id/iv1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="#drawable/ic_launcher" />
<TextView
android:id="#+id/tv1"
android:layout_toLeftOf="#+id/iv1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="TextView" />
</RelativeLayout>
It looks like that:
However, if I change android:layout_toLeftOf="#+id/iv1" to android:layout_toRightOf="#+id/iv1", my text view becomes positioned to right of image view. It seems like toRightOf works and toLeftOf doesn't.
Here how it looks:
What is the matter? How to make layout_toLeftOf work?

Change:
<TextView
android:id="#+id/tv1"
android:layout_toLeftOf="#+id/+iv1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="TextView" />
to:
<TextView
android:id="#+id/tv1"
android:layout_toLeftOf="#id/iv1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="TextView" />
You are using #+id/iv1 in your toLeftOf in the TextView instead of #id/iv1.
Also you should give the imageview a specific place in the view. Try to align it: layout_parentTop = true

set imageview property align_parent_right= true;

In my case (not in this layout) a problem was in android:layout_width of RelativeLayout. When it was wrap_content or match_parent, a layout became scattered. When I set it as, for instance, 300dp, everything was good.

How do I center text horizontally and vertically in a TextView?

How do I center the text horizontally and vertically in a TextView, so that it appears exactly in the middle of the TextView in Android?

I'm assuming you're using XML layout.
<TextView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center"
android:text="#string/**yourtextstring**"
/>
You can also use gravity center_vertical or center_horizontal according to your need.
As #stealthcopter commented, in java: .setGravity(Gravity.CENTER);.
And for Kotlin users, .gravity = Gravity.CENTER

android:gravity="center"
This will do the trick

You can also set it up dynamically using:
textView.setGravity(Gravity.CENTER_VERTICAL | Gravity.CENTER_HORIZONTAL);

android:layout_centerInParent="true"
This works when used with a RelativeLayout where the layout's height & width are set to wrap_content.

You can also use the combination:
android:gravity="left|center"
Then, if textview width is more than "fill_parent" the text will still be aligned to left (not centered as with gravity set only to "center").

Apply gravity:
TextView txtView = (TextView) findViewById(R.id.txtView);
txtView.setGravity(Gravity.CENTER_HORIZONTAL);
For vertical:
txtView.setGravity(Gravity.CENTER_VERTICAL);
In XML:
<TextView
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:gravity="center"
android:text="#string/Hello_World"
/>

There are two ways of doing this.
The first in the XML code. You need to pay attention at the Gravity Attribute. You also can find this attribute in the Graphic Editor; it may be easier than the XML EDITOR.
<TextView
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:gravity="center_vertical|center_horizontal"
android:text="Your Text"
/>
For your specific scenario, the values of gravity will be:
center_vertical|center_horizontal
In the graphical editor you will find all the possible values, even see their results.

If you are using TableLayout make sure to set the gravity of the TableRows to center, too.
Otherwise it will not work. At least it didn't work with me until I set the gravity of the TableRow to center.
For example, like this:
<TableRow android:id="#+id/tableRow2" android:layout_width="wrap_content" android:layout_height="wrap_content" android:gravity="center">
<TextView android:text="#string/chf" android:id="#+id/tv_chf" android:layout_weight="2" android:layout_height="wrap_content" android:layout_width="fill_parent" android:gravity="center"></TextView>
</TableRow>

You need to set TextView Gravity (Center Horizontal & Center Vertical) like this:
android:layout_centerHorizontal="true"
and
android:layout_centerVertical="true"
And dynamically using:
textview.setGravity(Gravity.CENTER);
textView.setGravity(Gravity.CENTER_VERTICAL | Gravity.CENTER_HORIZONTAL);

In my opinion,
android:gravity="center"
is better than,
android:layout_centerInParent="true"
which is better than,
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
at least for formatting text.

For Linear Layout:
In XML use something like this
<TextView
android:id="#+id/textView1"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:gravity="center_vertical|center_horizontal"
android:text="Your Text goes here"
/>
To do this at run time use something like this in your activity
TextView textView1 =(TextView)findViewById(R.id.texView1);
textView1.setGravity(Gravity.CENTER_VERTICAL | Gravity.CENTER_HORIZONTAL);
For Relative Layout: in XML use some thing like this
<TextView
android:id="#+id/textView1"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_centerInParent="true"
android:text="Your Text goes here"
/>
To do this at run time use something like this in your activity
TextView textView1 =(TextView)findViewById(R.id.texView1);
RelativeLayout.LayoutParams layoutParams = RelativeLayout.LayoutParams)textView1.getLayoutParams();
layoutParams.addRule(RelativeLayout.CENTER_IN_PARENT, RelativeLayout.TRUE);
textView1.setLayoutParams(layoutParams);

Use in the XML file.
Layout file
<TextView
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:gravity="center"
android:text="#string/stringtext"/>
or:
Use this inside the Java class
TextView textView =(TextView)findViewById(R.id.texviewid);
textView.setGravity(Gravity.CENTER_VERTICAL | Gravity.CENTER_HORIZONTAL);

Use this for relative layout
android:layout_centerInParent="true"
and for other layout
android:gravity="center"

If the TextView's height and width are wrap content then the text within the TextView always be centered. But if the TextView's width is match_parent and height is match_parent or wrap_content then you have to write the below code:
For RelativeLayout:
<?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">
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:text="Hello World" />
</RelativeLayout>
For LinearLayout:
<?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">
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:text="Hello World" />
</LinearLayout>

While using gravity works for TextView, there's an alternate method implemented in API level 17 -
textView.setTextAlignment(View.TEXT_ALIGNMENT_CENTER);
Don't know the difference, but it works too. However only for API level 17 or higher.

In RelativeLayout, it will be nice with it.
And another Button and anything else you can add.
The following works nicely for me.
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="#ff314859"
android:paddingLeft="16dp"
android:paddingRight="16dp">
<TextView
android:id="#+id/txt_logo"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="your text here"
android:textSize="30dp"
android:gravity="center"/>
...other button or anything else...
</RelativeLayout>

Use android:textAlignment="center"
<TextView
android:text="HOW WAS\nYOUR\nDAY?"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAlignment="center"
android:id="#+id/textView5"
/>

Easiest way (which is surprisingly only mentioned in comments, hence why I am posting as an answer) is:
textview.setGravity(Gravity.CENTER)

You can just set the gravity of your textview into CENTER.

TextView gravity works as per your parent layout.
LinearLayout:
If you use LinearLayout then you will find two gravity attribute
android:gravity & android:layout_gravity
android:gravity : represent layout potion of internal text of TextView while
android:layout_gravity : represent TextView position in parent view.
If you want to set text horizontally & vertically center then use below code this
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="300dp"
android:background="#android:color/background_light"
android:layout_height="300dp">
<TextView
android:layout_width="match_parent"
android:text="Hello World!"
android:gravity="center_horizontal"
android:layout_gravity="center_vertical"
android:layout_height="wrap_content"
/>
</LinearLayout>
RelativeLayout:
Using RelativeLayout you can use below property in TextView
android:gravity="center" for text center in TextView.
android:gravity="center_horizontal" inner text if you want horizontally centered.
android:gravity="center_vertical" inner text if you want vertically centered.
android:layout_centerInParent="true" if you want TextView in center position of parent view.
android:layout_centerHorizontal="true" if you want TextView in horizontally center of parent view.
android:layout_centerVertical="true" if you want TextView in vertically center of parent view.
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="300dp"
android:background="#android:color/background_light"
android:layout_height="300dp">
<TextView
android:layout_width="match_parent"
android:text="Hello World!"
android:gravity="center"
android:layout_centerInParent="true"
android:layout_height="wrap_content"
/>
</RelativeLayout>

If you are trying to center text on a TableRow in a TableLayout, here is how I achieved this:
<TableRow android:id="#+id/rowName"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:padding="5dip" >
<TextView android:id="#+id/lblSomeLabel"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:gravity="center"
android:layout_width="0dp"
android:layout_weight="100"
android:text="Your Text Here" />
</TableRow>

If you are using Relative Layout:
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/stringname"
android:layout_centerInParent="true"/>
If you are using LinearLayout
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/stringname"
android:layout_gravity="center"/>

Try this way,it will work
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
android:gravity="center">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAlignment="center"/>
</LinearLayout>

Here is my answer that I had used in my app. It shows text in center of the screen.
<TextView
android:id="#+id/txtSubject"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="#string/subject"
android:layout_margin="10dp"
android:gravity="center"
android:textAppearance="?android:attr/textAppearanceLarge" />

The TextView's height and width are wrap content then the text within the textview always be centered, then make center in its parent layout by using:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:text="Hello.."/>
</RelativeLayout>
For LinearLayout also the code is same :
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Hello.."/>
</LinearLayout>
and pro-grammatically parent is RelativeLayout java code this at run time use something like this in your activity
TextView textView1 =(TextView)findViewById(R.id.texView1);
RelativeLayout.LayoutParams layoutParams = RelativeLayout.LayoutParams)textView1.getLayoutParams();
layoutParams.addRule(RelativeLayout.CENTER_IN_PARENT, RelativeLayout.TRUE);
textView1.setLayoutParams(layoutParams);

Actually, we can do better by excluding fontPadding.
<TextView
android layout_height="wrap_content"
android layout_height="wrap_content"
android:includeFontPadding="false"
android:textAlignment="center"
/>

As many answers suggest above works fine.
android:gravity="center"
If you want to center it just vertically:
android:gravity="center_vertical"
or just horizontally:
android:gravity="center_horizontal"

Simply, in your XML file, set the textview gravity to center:
<TextView
android:gravity="center" />

android:gravity="center_horizontal" for align text Center horizontally.
android:gravity="center_vertical" for align text Center vertically.
android:gravity="center" for align text Center both vertically and horizontally.
<TextView
android:layout_width="match_parent"
android:gravity="center_horizontal|center_vertical"
android:layout_height="match_parent" />

You can do like this to get text centered
<TextView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center" />

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