Maintain textview height in LinearLayout

Maintain textview height in LinearLayout - android

I have two TextViews in LinearLayout. Layout orientation is in horizontal. I have to maintain both Textview height as equal. But as per text length both are shown in different height.
I had tried to make the same text length like below
public static String padRight(String s, int n) {
return String.format("%1$-" + n + "s", s);
}
But height is bit different. How do i solve this ?

If I didn't misunderstand you you want to TextViews inside a horizontal oriented LinearLayout, and both TextViews must in same height.
Then use a layout something like below:
<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="wrap_content"
android:orientation="horizontal" >
<TextView
android:id="#+id/textView1"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:background="#B40431"
android:text="text sample\ntext sample\ntext sample\ntext sample\ntext sample\ntext sample\n"
android:gravity="center_vertical"/>
<TextView
android:id="#+id/textView2"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:background="#0000FF"
android:text="text sample\ntext sample\ntext sample"
android:gravity="center_vertical"/>
</LinearLayout>
Output is going to be this:

Because the text is long textview getting bigger So You set the singleLine true of your textView then it will work,
Add this line in your Textview xml:--
android:singleLine="true"
hope it helps you..

Related

How can I place two views depending on their width?

In our project we have such a case: we have two textviews (let's say, #id/text_view_1 and #id/text_view_2). We should place them horizontally (#id/text_view_1 and then #id/text_view_2) if their width combined is less than the width of their parent or vertically (text_view_2 above text_view_1) if they are too wide.
Right now the best solution I've come up with looks something like this:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/parent"
android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:id="#+id/text_view_above_2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentStart="true"
android:layout_alignParentTop="true" />
<TextView
android:id="#+id/text_view_1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBaseline="#+id/text_view_2_right"
android:layout_alignBottom="#+id/text_view_2_right"
android:layout_alignParentStart="true" />
<TextView
android:id="#+id/text_view_right_2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#+id/text_view_2_above"
android:layout_toEndOf="#+id/text_view_1" />
</RelativeLayout>
Here is the logic of toggling visibility of text_views
private void toggleVisibility() {
TextView textView1 = (TextView) findViewById(R.id.text_view_1);
TextView textViewAbove2 = (TextView) findViewById(R.id.text_view_above_2);
TextView textViewRight2 = (TextView) findViewById(R.id.text_view_right_2);
textView1.measure(0, 0);
textViewAbove2.measure(0, 0);
textViewRight2.measure(0, 0);
View parent = findViewById(R.id.parent);
parent.measure(0, 0);
if (textView1.getMeasuredWidth() + textViewRight2.getMeasuredWidth() < parent.getMeasuredWidth()) {
textViewAbove2.setVisibility(View.GONE);
textViewRight2.setVisibility(View.VISIBLE);
} else {
textViewRight2.setVisibility(View.GONE);
textViewAbove2.setVisibility(View.VISIBLE);
}
}
Is there a solution more "beautiful" and shorter than the one I've described? I guess there is a way to do it with ConstraintLayout instead of RelativeLayout but I'm not sure.
EDIT 1: probably I have to provide the result I want to see. Here is what an activity supposed to look like if both views are short:
And here is what it should look like if views are too long:

Take a look at FlexboxLayout.
Here is a solution using FlexboxLayout:
<com.google.android.flexbox.FlexboxLayout
android:id="#+id/parent"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:flexWrap="wrap">
<TextView
android:id="#+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_margin="16dp"
android:text="This is a short string." />
<TextView
android:id="#+id/textView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_margin="16dp"
android:text="This is another short string." />
</com.google.android.flexbox.FlexboxLayout>
Using the same XML with a longer string for the first text view yields the following:

Solution:If you want to set TextView as per their width requirements then you will simply use LinearLayout as parent with width wrap_content and for both child TextViews also give width 'wrap_content'

try using wrap_content and put these child text views inside a parent LinearLayout , give wrap_content as width for both of the child textviews. It will place according to the content in those textviews.
If You want to put Views Horizontally --
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/parent"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:orientation="horizontal">
<TextView
android:id="#+id/text_view1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
/>
<TextView
android:id="#+id/text_view2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
/>
</LinearLayout>
If You want to put Views Vertically --
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/parent"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical">
<TextView
android:id="#+id/text_view1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
/>
<TextView
android:id="#+id/text_view2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
/>
</LinearLayout>

Try using percentagelayout . This might help. For more details provide desired output.

TextSwitcher not centered vertically with layout_gravity: center_vertical

I have a vertical LinearLayout with 2 TextSwitcher inside. Sometimes only the first one(#+id/ts1) will show, sometimes both of them will show on screen. The font size for ts1 is 20, for ts2 is 16.
<LinearLayout
android:id="#+id/linearLayout1"
android:orientation="vertical"
android:layout_width="wrap_content"
android:layout_height="50dp"
android:gravity="center_vertical"
android:focusable="false"
android:layout_marginLeft="#dimen/dimen_left1"
android:visibility="gone">
<TextSwitcher
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_weight="1"
android:layout_gravity="center_vertical"
android:id="#+id/ts1"/>
<TextSwitcher
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_weight="1"
android:layout_gravity="center_vertical"
android:id="#+id/ts2"/>
</LinearLayout>
When I tested it, when both of them showed on screen, it worked fine, but when there's only ts1 shown, the text is not centered vertically, it's more like on the top vertically instead of centered. I programmatically set the visibility of these 2 TextSwitchers.
Does anyone know why this happens?
Thanks!!!

Setting the layout_gravity on TextSwitchers does not change the text android:gravity of the underlying TextViews. You can override the default TextViews that TextSwitchers use by putting them in your XML. From there, you can set the android:layout_gravity or android:gravity on them to center the text vertically. This should work:
<TextSwitcher
android:id="#+id/ts1"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_weight="1">
<TextView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center" />
<TextView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center" />
</TextSwitcher>
<TextSwitcher
android:id="#+id/ts2"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_weight="1">
<TextView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center" />
<TextView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center" />
</TextSwitcher>

You need to add gravity option to TextView, not the TextSwitcher.
For example, you can add layout_width, layout_height, and gravity option dynamically.
mSwitcher1 = (TextSwitcher) findViewById(R.id.textSwitcher1);
mSwitcher1.setFactory(new ViewSwitcher.ViewFactory() {
public View makeView() {
TextView myText = new TextView(MainActivity.this);
myText.setGravity(Gravity.TOP | Gravity.CENTER_HORIZONTAL);
myText.setTextSize(36);
myText.setTextColor(Color.BLUE);
// Add this
myText.setGravity(Gravity.CENTER);
// Add this
myText.setLayoutParams(new FrameLayout.LayoutParams(FrameLayout.LayoutParams.MATCH_PARENT, FrameLayout.LayoutParams.MATCH_PARENT));
return myText;
}
});

Have you tried using the ConstraintLayout? Using it may help you out. If you give more information on what the behavior of everything needs to be, I can give you a code example.

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.

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" />

Develop Reference

The Android operating system is a mobile operating system that was developed by Google (GOOGL?) to be primarily used for touchscreen devices, cell phones, and tablets.

Maintain textview height in LinearLayout - android

Because the text is long textview getting bigger So You set the singleLine true of your textView then it will work, Add this line in your Textview xml:-- android:singleLine="true" hope it helps you..

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