[android] Can I underline text in an Android layout?

How can I define underlined text in an Android layout xml file?

A simple and flexible solution in xml:

<View
  android:layout_width="match_parent"
  android:layout_height="3sp"
  android:layout_alignLeft="@+id/your_text_view_need_underline"
  android:layout_alignRight="@+id/your_text_view_need_underline"
  android:layout_below="@+id/your_text_view_need_underline"
  android:background="@color/your_color" />

The top voted answer is right and simplest. However, sometimes you may find that not working for some font, but working for others.(Which problem I just came across when dealing with Chinese.)

Solution is do not use "WRAP_CONTENT" only for your TextView, cause there is no extra space for drawing the line. You may set fixed height to your TextView, or use android:paddingVertical with WRAP_CONTENT.

I had a problem where I'm using a custom font and the underline created with the resource file trick (<u>Underlined text</u>) did work but Android managed to transform the underline to a sort of strike trough.

I used this answer to draw a border below the textview myself: https://stackoverflow.com/a/10732993/664449. Obviously this doesn't work for partial underlined text or multilined text.

Most Easy Way

TextView tv = findViewById(R.id.tv);
tv.setText("some text");
setUnderLineText(tv, "some");

Also support TextView childs like EditText, Button, Checkbox

public void setUnderLineText(TextView tv, String textToUnderLine) {
        String tvt = tv.getText().toString();
        int ofe = tvt.indexOf(textToUnderLine, 0);

        UnderlineSpan underlineSpan = new UnderlineSpan();
        SpannableString wordToSpan = new SpannableString(tv.getText());
        for (int ofs = 0; ofs < tvt.length() && ofe != -1; ofs = ofe + 1) {
            ofe = tvt.indexOf(textToUnderLine, ofs);
            if (ofe == -1)
                break;
            else {
                wordToSpan.setSpan(underlineSpan, ofe, ofe + textToUnderLine.length(), Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
                tv.setText(wordToSpan, TextView.BufferType.SPANNABLE);
            }
        }
    }

If you want

- Clickable underline text?

- Underline multiple parts of TextView?

Then Check This Answer

check out the underscored clickable button style:

<TextView
    android:id="@+id/btn_some_name"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="@string/btn_add_contact"
    android:textAllCaps="false"
    android:textColor="#57a0d4"
    style="@style/Widget.AppCompat.Button.Borderless.Colored" />

strings.xml:

<string name="btn_add_contact"><u>Add new contact</u></string>

Result:

The "accepted" answer above does NOT work (when you try to use the string like textView.setText(Html.fromHtml(String.format(getString(...), ...))).

As stated in the documentations you must escape (html entity encoded) opening bracket of the inner tags with <, e.g. result should look like:

<resource>
    <string name="your_string_here">This is an &lt;u&gt;underline&lt;/u&gt;.</string>
</resources>

Then in your code you can set the text with:

TextView textView = (TextView) view.findViewById(R.id.textview);
textView.setText(Html.fromHtml(String.format(getString(R.string.my_string), ...)));

If you want to achieve this in XML, declare your string in resource and put that resource value into underline tag (<u></u>) of HTML. in TextView, add

android:text="@string/your_text_reference"

And in string resource value,

<string name="your_text_reference"><u>Underline me</u></string>

If you want to achieve this programmatically, for Kotlin use

textView.paintFlags = textView.paintFlags or Paint.UNDERLINE_TEXT_FLAG

or,

textView.text = Html.fromHtml("<p><u>Underline me</u></p>")

To do that in Kotlin:

yourTextView.paint?.isUnderlineText = true

You can try with

textview.setPaintFlags(textview.getPaintFlags() |   Paint.UNDERLINE_TEXT_FLAG);

another solution is to a create a custom view that extend TextView as shown below

public class UnderLineTextView extends TextView {

    public UnderLineTextView(Context context) {
        super(context);
        this.setPaintFlags(Paint.UNDERLINE_TEXT_FLAG);
    }

    public UnderLineTextView(Context context, @Nullable AttributeSet attrs) {
        super(context, attrs);
        this.setPaintFlags(Paint.UNDERLINE_TEXT_FLAG);
    }

}

and just add to xml as shown below

<yourpackage.UnderLineTextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="underline text"
 />

Strings.xml file content:

<resource>
     <string name="my_text">This is an <u>underline</u>.</string> 
</resources> 

Layout xml file shold use the above string resource with below properties of textview, as shown below:

<TextView 
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:gravity="center_horizontal"
    android:text="@string/my_text"

    android:selectAllOnFocus="false"
    android:linksClickable="false"
    android:autoLink="all"
    />

I simplified Samuel's answer:

<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
    <!--https://stackoverflow.com/a/40706098/4726718-->
    <item
        android:left="-5dp"
        android:right="-5dp"
        android:top="-5dp">
        <shape>
            <stroke
                android:width="1.5dp"
                android:color="@color/colorAccent" />
        </shape>
    </item>
</layer-list>

try this code

in XML

<resource>
 <string name="my_text"><![CDATA[This is an <u>underline</u>]]></string> 
</resources> 

in Code

TextView textView = (TextView) view.findViewById(R.id.textview);
textView.setText(Html.fromHtml(getString(R.string.my_text)));

Good Luck!

1. Go to strings.xml resource file
2. Add a string in the resource file with an HTML underline tag where necessary.

strings.xml HTML underline sample

3. Call the string resource ID in your Java code as following:

sampleTextView.setText(R.string.sample_string);

4. The output should have the word "Stackoverflow" underlined.

Furthermore, the following code will not print the underline:

String sampleString = getString(R.string.sample_string);
sampleTextView.setText(sampleString);

Instead, use the following code to retain rich text format:

CharSequence sampleString = getText(R.string.sample_string);
sampleTextView.setText(sampleString);

"You can use either getString(int) or getText(int) to retrieve a string. getText(int) retains any rich text styling applied to the string." Android documentation.

Refer to the documentation: https://developer.android.com/guide/topics/resources/string-resource.html

I hope this helps.

Its quite late to answer this but suppose if anyone wants to get the text dynamically then they can use this simple one line in their java code which works:

 textView.setText(Html.fromHtml("<p><u>" + get_name + "</u></p>"));

For Button and TextView this is the easiest way:

Button:

Button button = (Button) findViewById(R.id.btton1);
button.setPaintFlags(button.getPaintFlags() | Paint.UNDERLINE_TEXT_FLAG);

Textview:

TextView textView = (TextView) findViewById(R.id.textview1);
textView.setPaintFlags(textView.getPaintFlags() | Paint.UNDERLINE_TEXT_FLAG);

In Kotlin extension function can be used. This can only be used from code, not xml.

fun TextView.underline() {
    paintFlags = paintFlags or Paint.UNDERLINE_TEXT_FLAG
}

Usage:

 tv_change_number.underline()
 tv_resend_otp.underline()

One line solution

myTextView.setText(Html.fromHtml("<p><u>I am Underlined text</u></p>"));

It is bit late but could be useful for someone.

Very compact, kotlin version:

tvTitle.apply { 
    text = "foobar"
    paint?.isUnderlineText = true
}

I know this is a late answer, but I came up with a solution that works pretty well... I took the answer from Anthony Forloney for underlining text in code and created a subclass of TextView that handles that for you. Then you can just use the subclass in XML whenever you want to have an underlined TextView.

Here is the class I created:

import android.content.Context;
import android.text.Editable;
import android.text.SpannableString;
import android.text.TextWatcher;
import android.text.style.UnderlineSpan;
import android.util.AttributeSet;
import android.widget.TextView;

/**
 * Created with IntelliJ IDEA.
 * User: Justin
 * Date: 9/11/13
 * Time: 1:10 AM
 */
public class UnderlineTextView extends TextView
{
    private boolean m_modifyingText = false;

    public UnderlineTextView(Context context)
    {
        super(context);
        init();
    }

    public UnderlineTextView(Context context, AttributeSet attrs)
    {
        super(context, attrs);
        init();
    }

    public UnderlineTextView(Context context, AttributeSet attrs, int defStyle)
    {
        super(context, attrs, defStyle);
        init();
    }

    private void init()
    {
        addTextChangedListener(new TextWatcher()
        {
            @Override
            public void beforeTextChanged(CharSequence s, int start, int count, int after)
            {
                //Do nothing here... we don't care
            }

            @Override
            public void onTextChanged(CharSequence s, int start, int before, int count)
            {
                //Do nothing here... we don't care
            }

            @Override
            public void afterTextChanged(Editable s)
            {
                if (m_modifyingText)
                    return;

                underlineText();
            }
        });

        underlineText();
    }

    private void underlineText()
    {
        if (m_modifyingText)
            return;

        m_modifyingText = true;

        SpannableString content = new SpannableString(getText());
        content.setSpan(new UnderlineSpan(), 0, content.length(), 0);
        setText(content);

        m_modifyingText = false;
    }
}

Now... whenever you want to create an underlined textview in XML, you just do the following:

<com.your.package.name.UnderlineTextView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_gravity="center_horizontal"
    android:gravity="center"
    android:text="This text is underlined"
    android:textColor="@color/blue_light"
    android:textSize="12sp"
    android:textStyle="italic"/>

I have added additional options in this XML snippet to show that my example works with changing the text color, size, and style...

Hope this helps!

Just use the attribute in string resource file e.g.

<string name="example"><u>Example</u></string>

A cleaner way instead of the
textView.setPaintFlags(textView.getPaintFlags() | Paint.UNDERLINE_TEXT_FLAG); method is to use textView.getPaint().setUnderlineText(true);

And if you need to later turn off underlining for that view, such as in a reused view in a RecyclerView, textView.getPaint().setUnderlineText(false);

The most recent approach of drawing underlined text is described by Romain Guy on medium with available source code on GitHub. This sample application exposes two possible implementations:

• A Path-based implementation that requires API level 19
• A Region-based implementation that requires API level 1

I used this xml drawable to create a bottom-border and applied the drawable as the background to my textview

<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
    <item>
        <shape android:shape="rectangle" >
            <solid android:color="@android:color/transparent" />
        </shape>
    </item>

    <item android:top="-5dp" android:right="-5dp" android:left="-5dp">
        <shape>
            <solid android:color="@android:color/transparent" />
            <stroke
                    android:width="1.5dp"
                    android:color="@color/pure_white" />
        </shape>
    </item>
</layer-list>

HtmlCompat.fromHtml(
                    String.format(context.getString(R.string.set_target_with_underline)),
                    HtmlCompat.FROM_HTML_MODE_LEGACY)
<string name="set_target_with_underline">&lt;u>Set Target&lt;u> </string>

Note the Escape symbol in xml file