enabling scrolling for textview

enabling scrolling for textview - android

I have a following xml for my activity.
<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"
tools:context=".Activity1" >
<RelativeLayout
android:id="#+id/titleStoryRelativeLayout"
android:layout_weight="#string/titleWeight"
android:layout_width="fill_parent"
android:layout_height="0dip">
<TextView
android:id="#+id/titleStory"
android:layout_width="fill_parent"
android:layout_height="fill_parent"/>
</RelativeLayout>
<RelativeLayout
android:id="#+id/contentTextViewLayout"
android:layout_weight="#string/contentTextViewWeight"
android:layout_width="fill_parent"
android:layout_height="0dip">
<TextView
android:id="#+id/textViewStory1"
android:layout_width="fill_parent"
android:layout_height="wrap_content"/>
</RelativeLayout>
<RelativeLayout
android:id="#+id/footerStoryRelativeLayout"
android:layout_weight="#string/footerWeight"
android:layout_width="fill_parent"
android:layout_height="0dip>
<Button
android:id="#+id/buttonPrevious"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="fill_parent"
android:layout_alignParentLeft="true"
android:onClick="loadPrevious"
android:text="#string/stringButtonPrevious"/>
<Button
android:id="#+id/buttonNext"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="fill_parent"
android:layout_alignParentRight="true"
android:onClick="loadNext"
android:text="#string/stringButtonNext"/>
Here I am loading my Textview (#+id/textViewStory1) dynamically from my code with some text. The problem is that during loading, few lines go beyond the screen. I am planning to enable scrolling so as user can scroll down to view those missing lines. But the scrolling should only be limited till the last line and not beyond. Any suggestion on how can I set that?

Set these settings for your textview:
android:maxLines = "AN_INTEGER"
android:scrollbars = "vertical"
You can then set it to be scrollable in java:
TextView.setMovementMethod(new ScrollingMovementMethod());

Try to use ScrollView (official documentation)

You can limit the Height of TextView to match the number of lines you want to see, after that put your TextView in a ScrollView
I had done a simple example to demonstrate this...
<ScrollView android:layout_height="30dp"
android:layout_width="match_parent">
<TextView
android:layout_width="match_parent"
android:layout_height="30dp"
android:textSize="16sp"
android:id="#+id/tv1"
/>
</ScrollView>
Observe how I fixed ScrollView's height and matched TextView's height to it.
I had answered this exact question before here , please check for existing answers on SO before asking them again.

Related

TextView/EditText Explain only 1 line

I have created this, with 1 webview and 1 textview (tried also edittext) and a scrollview, but in the preview it explains all lines, when i launch it explain only 1 line. i tried to rmeove scrollview, webview...nothing...how can i do? Thank you
<?xml version="1.0" encoding="utf-8"?>
<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fillViewport="true">
<LinearLayout
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="wrap_content"
android:orientation="vertical"
app:layout_behavior="#string/appbar_scrolling_view_behavior"
tools:context=".ActivityMappa"
tools:showIn="#layout/activity_mappa"
>
<WebView
android:layout_width="match_parent"
android:layout_height="300dp"
android:layout_marginTop="50dp"
android:layout_marginRight="15dp"
android:layout_marginLeft="15dp"
android:layout_marginBottom="20dp"
android:id="#+id/webview" />
<EditText
android:id="#+id/testo"
android:layout_width="match_parent"
android:layout_height="126dp"
android:layout_marginLeft="15dp"
android:layout_marginRight="15dp"
android:background="#android:color/transparent"
android:clickable="false"
android:focusable="false"
android:inputType="textMultiLine"
android:lines="10"
android:scrollbars="vertical"
android:text="#string/testonavi_spawn"
android:textSize="15sp" />
</LinearLayout>
</ScrollView>
Preview on Android Studio
Preview on my Phone/Emulator

In strings.xml you must escape all ' of testonavi_spawnby \', for example: ...all\'Avamposto...
Take a look into the documentation for String resources.

Edittext height is given as 126dp. You'll not be able to see 30 lines in it. so make the layout_heigh of the edittext as "wrap_content". This will make the edittext dynamic. As the total content is in scrollview, you'll still be able to scroll and see the complete content

Did you try using
android:minLines=10
where 10 is the number of lines you want it to appear.
Since you have set the android:width="match_parent" maybe its going beyond the view change it to android:layout_width="wrap_parent".
Change the code to:
<TextView
android:id="#+id/testo"
android:layout_width="wrap_parent"
android:layout_height="wrap_content"
android:layout_marginLeft="15dp"
android:layout_marginRight="15dp"
android:minLines="10"
android:text="#string/testonavi_spawn"
android:textSize="15sp" />
NOTE: Always use a TextView to display the text and EditText to edit any texts.

TextView not wrapping to multiline

I have a TextView inside a LinearLayout which displays only a part of its text without wrapping to a newline and cannot understand why. It doesn't even show the ellipsis somewhere.
The TextView
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="#string/import_progress_text"
android:singleLine="false"
android:maxLines="4"
android:ellipsize="end"
style="#style/TxtDefault" />
i also tried layout_weight=0 along with layout_height=0 but still no luck. All the siblings inside the LinearLayout have layout_height=wrap_content set.
EDIT
Okay apparently it works when a fixed width is set, but neither with fill_parent nor with match_parent. Is this the expected behaviour?
Per Request the whole layout
Note that inside the FrameLayout is another invisible one, which is rather long
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
style="#style/ContentBody"
>
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical"
android:id="#+id/progress"
android:layout_gravity="center">
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="#string/import_progress_title"
style="#style/TxtTitle" />
<TextView
android:layout_width="410dp"
android:layout_height="wrap_content"
android:text="#string/import_progress_text"
android:singleLine="false"
android:maxLines="4"
android:ellipsize="end"
style="#style/TxtDefault" />
<ProgressBar
style="?android:attr/progressBarStyleHorizontal"
android:layout_width="410dp"
android:layout_height="wrap_content"
android:id="#+id/progress_bar_view"
android:progress="2"/>
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="#string/import_progress_start"
android:id="#+id/progress_text_view"
style="#style/TxtSecondary" />
</LinearLayout>
</FrameLayout>

if you want to always show text in n lines, just add android:lines="n",
or if it's not work, try to use for your TextView ->
android:textAppearance="?android:attr/textAppearanceLarge"
hope that will help.

The code snippet is wrapping to multiline perfectly. There might be some problem with the IDE, which is not previewing properly. Test on a real device.

when adding views they go one below another even if width is wrap content

I have a Linear layout then programatically I'm adding some spinners and buttons and so on, but I have xml button Wrap content (width) and then on java I add spinner (or anything else) and it goes below this view even if both views are wrap content:
progBar = new ProgressBar(this);
pBarToca = new ProgressBar(this);
pBarToca.setLayoutParams(new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT,LayoutParams.WRAP_CONTENT));
linToca = (LinearLayout) findViewById(R.id.tetoca);
linToca.addView(pBarToca);
and it's placed under the button of xml:
<LinearLayout android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical" android:layout_marginTop="6dp"
android:id="#+id/tetoca">
<TextView style="#style/StylePartida"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="#string/te_toca_jugar" />
<Button android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="#A7E9A9" android:onClick="callJugar"
android:text="#string/jugar" />
</LinearLayout>
edit!!!!!!
I want textview on first line then on next line button + progressbar (for example)

You have android:orientation=vertical so the Views will be laid out starting at the top and going down.
If you want them to all be next to each other, remove that from your xml since the default orientation for a LinearLayout is horizontal. If you do this, you will obviously need to change the android:width to wrap_content for your TextView or else it will take up the entire screen.
After your comment, a RelativeLayout would work best here.
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent"/>
<TextView
style="#style/StylePartida"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="#string/te_toca_jugar"
android:id="#+id/tvID" /> // give it an id
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="6dp"
android:id="#+id/tetoca"
android:layout_below="#/id=tvID"> // place it below the TV
<Button android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="#A7E9A9" android:onClick="callJugar"
android:text="#string/jugar" />
</LinearLayout>
</RelativeLayout>
Note the changes in the comments. Now when you add your progressbar to the LL, it should be next to the Button. You may need some changes but this should give you approximately what you want.

<LinearLayout android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="6dp"
android:id="#+id/tetoca">
<TextView style="#style/StylePartida"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/te_toca_jugar"
android:text="#string/te_toca_jugar" />
<Button android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="#A7E9A9" android:onClick="callJugar"
android:text="#string/jugar" />
</LinearLayout>

In your textView you are matching the parent
android:layout_width="match_parent"
This will cause the textview to take up the entire width of the parent view.
android:layout_width="wrap_content"
and
android:orientation="horizontal"
android:orientation="vertical" will cause the elements to be stacked.
If you are using "horizontal" it's important not to have a child element with width matching parent.
EDIT:
After OPs change to question:
I have used a textview, two buttons and listview to give you an idea of how you can format it. There are many ways to achieve the same thing, this is one suggestion.
The internal linearlayout has a horizontal orientation (by default).
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="6dp"
android:orientation="vertical">
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="te_toca_jugar"/>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="#A7E9A9"
android:text="jugar"/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="#A7E9A9"
android:text="jugar2"/>
<ListView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/lv">
</ListView>
</LinearLayout>
</LinearLayout>

TextView overlap in ListView implementation android with 2 textviews

I am implementing listview with 2 textviews , and for reference used Basic Layout and Formatting
Instead of stock names which are short i am using long text, so when i use a long text, it overlaps with the second .
So how to get it right, so that the 2 textviews don't overlap each other.

You can used following code to solve your problem:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="horizontal"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:weightSum="1">
<TextView
android:layout_width="0dp"
android:layout_height="fill_parent"
android:id="#+id/ticker_symbol"
android:text="sdasd sadas"
android:layout_weight=".5"/>
<TextView
android:layout_width="0dp"
android:layout_height="fill_parent"
android:id="#+id/ticker_price"
android:text="dfsd"
android:layout_weight=".5"
android:gravity="right" />
</LinearLayout>
Output:

To avoid overlapping, you could set the second textview to align to right (android:layout_toRightOf).
For example:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="horizontal"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<TextView
android:layout_width="wrap_content"
android:layout_height="fill_parent"
android:id="#+id/ticker_symbol"
android:layout_alignParentLeft="true" />
<TextView
android:layout_width="wrap_content"
android:layout_height="fill_parent"
android:id="#+id/ticker_price"
android:layout_toRightOf="#id/ticker_symbol"
android:layout_alignParentRight="true" />
</RelativeLayout>

I guess you mean due to long length of text it goes to next line or on next TextView
So i suggest you to use textView property android:ellipsized="end" and also use android:single_line="true" instead this you can directly specify the maxline=1
I'm not sure with names spelled correctly so check while typing
<TextView
android:layout_width="wrap_content"
android:layout_height="fill_parent"
android:id="#+id/ticker_symbol"
android:ellipsezed="end"
android:singe_line="true"
android:layout_alignParentLeft="true" />
Hope this explanation woks for you let me know..

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.

enabling scrolling for textview - android

Set these settings for your textview: android:maxLines = "AN_INTEGER" android:scrollbars = "vertical" You can then set it to be scrollable in java: TextView.setMovementMethod(new ScrollingMovementMethod());

Try to use ScrollView (official documentation)

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