Can I underline text in an android layout?



Answers

You can try with

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

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




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

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



One line solution:

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



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>



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://.com/a/10732993/664449. Obviously this doesn't work for partial underlined text or multilined text.




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!




The most recent approach of drawing underlined text is described by Romain Guy on medium with available source code on GitHub.




For Button and TextView this is the easiest way:

Button:

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

Textview:

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



  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

  1. Call the string resource ID in your Java code as following:
sampleTextView.setText(R.string.sample_string);
  1. The output should have the word "" 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:

String 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.




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