[android] How do you underline a text in Android XML?

How do you underline a text in an XML file? I can't find an option in textStyle.

There are different ways to achieve underlined text in an Android TextView.

1.<u>This is my underlined text</u> or

I just want to underline <u>this</u> word

2.You can do the same programmatically.

`textView.setPaintFlags(textView.getPaintFlags() | Paint.UNDERLINE_TEXT_FLAG);`

3.It can be done by creating a SpannableString and then setting it as the TextView text property

SpannableString text = new SpannableString("Voglio sottolineare solo questa parola");
text.setSpan(new UnderlineSpan(), 25, 6, 0);
textView.setText(text);

You can use the markup below, but note that if you set the textAllCaps to true the underline effect would be removed.

<resource>
    <string name="my_string_value">I am <u>underlined</u>.</string>
</resources>

Note

Using textAllCaps with a string (login_change_settings) that contains markup; the markup will be dropped by the caps conversion

The textAllCaps text transform will end up calling toString on the CharSequence, which has the net effect of removing any markup such as . This check looks for usages of strings containing markup that also specify textAllCaps=true.

To complete Bhavin answer. For exemple, to add underline or redirection.

((TextView) findViewById(R.id.tv_cgu)).setText(Html.fromHtml(getString(R.string.upload_poi_CGU)));

<string name="upload_poi_CGU"><![CDATA[ J\'accepte les <a href="">conditions générales</a>]]></string>

and you can know compatible tag here : http://commonsware.com/blog/Android/2010/05/26/html-tags-supported-by-textview.html

First of all, go to String.xml file

you can add any HTML attributes like , italic or bold or underline here.

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

Create a String resource:

<string name="HEADER_DELTA"><b><u>DELTA</u></b></string>

and add to your Textview

    <TextView
        android:id="@+id/txtDeltaText"
        style="@style/Default_TextBox_Small"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="4dp"
        android:gravity="center_horizontal"
        android:text="@string/HEADER_DELTA"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toEndOf="@+id/txtActualMetric"
        app:layout_constraintTop_toBottomOf="@+id/txtMetricName" />

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

If it does not work then

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

Because "<" could be a keyword at some time.

And for Displaying

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

Use this:

TextView txt = (TextView) findViewById(R.id.Textview1);
txt.setPaintFlags(txt.getPaintFlags() | Paint.UNDERLINE_TEXT_FLAG);

I used below method, it worked for me. Below is example for Button but we can use in TextView as well.

Button btnClickMe = (Button) findViewById(R.id.btn_click_me);
btnClickMe.setPaintFlags(btnClickMe.getPaintFlags() | Paint.UNDERLINE_TEXT_FLAG);

If you want to compare text String or the text will change dynamically then you can created a view in Constraint layout it will adjust according to text length like this

 <android.support.constraint.ConstraintLayout
    android:layout_width="match_parent"
    android:layout_height="wrap_content">

    <TextView
        android:id="@+id/txt_Previous"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="16dp"
        android:layout_marginLeft="16dp"
        android:layout_marginEnd="16dp"
        android:layout_marginRight="16dp"
        android:layout_marginBottom="8dp"
        android:gravity="center"
        android:text="Last Month Rankings"
        android:textColor="@color/colorBlue"
        android:textSize="15sp"
        android:textStyle="bold"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent" />

    <View
        android:layout_width="0dp"
        android:layout_height="0.7dp"
        android:background="@color/colorBlue"
        app:layout_constraintEnd_toEndOf="@+id/txt_Previous"
        app:layout_constraintStart_toStartOf="@+id/txt_Previous"
        app:layout_constraintBottom_toBottomOf="@id/txt_Previous"/>


</android.support.constraint.ConstraintLayout>

Another way to do it, is creating a custom component extending TextView. It's good for cases where you need to have multiple underlined TextViews.

Here's the code for the component:

package com.myapp.components;

import android.content.Context;
import android.support.v7.widget.AppCompatTextView;
import android.text.SpannableString;
import android.text.style.UnderlineSpan;
import android.util.AttributeSet;

public class LinkTextView extends AppCompatTextView {
    public LinkTextView(Context context) {
        this(context, null);
    }

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

    @Override
    public void setText(CharSequence text, BufferType type) {
        SpannableString content = new SpannableString(text);
        content.setSpan(new UnderlineSpan(), 0, content.length(), 0);

        super.setText(content, type);
    }
}

And how to use it in xml:

<com.myapp.components.LinkTextView
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:text="Hello World!" />